FEATURES DESCRIPTIO U - Analog Devices · 2020. 2. 1. · 1352/53 TA01 Available in SO-8 ... CMRR...
Transcript of FEATURES DESCRIPTIO U - Analog Devices · 2020. 2. 1. · 1352/53 TA01 Available in SO-8 ... CMRR...
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LT1352/LT1353
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TYPICAL APPLICATIO
U
APPLICATIO SU
DESCRIPTIO
U
FEATURES
Dual and Quad250µA, 3MHz, 200V/µs
Operational Amplifiers
3MHz Gain Bandwidth 200V/µs Slew Rate 250µA Supply Current per Amplifier C-LoadTM Op Amp Drives All Capacitive Loads Unity-Gain Stable Maximum Input Offset Voltage: 600µV Maximum Input Bias Current: 50nA Maximum Input Offset Current: 15nA Minimum DC Gain, RL = 2k: 30V/mV Input Noise Voltage: 14nV/√Hz Settling Time to 0.1%, 10V Step: 700ns Settling Time to 0.01%, 10V Step: 1.25µs Minimum Output Swing into 1k: ±13V Minimum Output Swing into 500Ω: ±3.4V Specified at ±2.5V, ±5V and ±15V
Battery-Powered Systems Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers
The LT®1352/LT1353 are dual and quad, very low power,high speed operational amplifiers with outstanding ACand DC performance. The amplifiers feature much lowersupply current and higher slew rate than devices withcomparable bandwidth. The circuit combines the slewingperformance of a current feedback amplifier in a trueoperational amplifier with matched high impedanceinputs. The high slew rate ensures that the large-signalbandwidth is not degraded. Each output is capable ofdriving a 1kΩ load to ±13V with ±15V supplies and a 500Ωload to ±3.4V on ±5V supplies.
The LT1352/LT1353 are members of a family of fast, highperformance amplifiers using this unique topology andemploying Linear Technology Corporation’s advancedcomplementary bipolar processing. For higher bandwidthdevices with higher supply current see the LT1354 throughLT1365 data sheets. Bandwidths of 12MHz, 25MHz, 50MHzand 70MHz are available with 1mA, 2mA, 4mA and 6mA ofsupply current per amplifier. Singles, duals and quads ofeach amplifier are available. The LT1352 is available in an8-lead SO package. The LT1353 is offered in a 14-leadnarrow surface mount package.
C-Load is a trademark of Linear Technology Corporation., LTC and LT are registered trademarks of Linear Technology Corporation.
Instrumentation Amplifier Large-Signal Response
AV = –1 1352/53 TA02
+
–
GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102TRIM R5 FOR GAINTRIM R1 FOR COMMON MODE REJECTIONBW = 30kHz
–
+
1/2LT1352 –
+
1/2LT1352
R150k
R25k
R51.1k
R35k
R450k
VIN
VOUT
1352/53 TA01
Available in SO-8 Package LT1353 in Narrow Surface Mount Package
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Consult LTC Marketing for parts specified with wider operating temperature ranges.
SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS
VOS Input Offset Voltage ±15V 0.2 0.6 mV±5V 0.2 0.6 mV
±2.5V 0.3 0.8 mV
IOS Input Offset Current ±2.5V to ±15V 5 15 nA
IB Input Bias Current ±2.5V to ±15V 20 50 nA
en Input Noise Voltage f = 10kHz ±2.5V to ±15V 14 nV/√Hz
in Input Noise Current f = 10kHz ±2.5V to ±15V 0.5 pA/√Hz
RIN Input Resistance VCM = ±12V ±15V 300 600 MΩDifferential ±15V 20 MΩ
CIN Input Capacitance ±15V 3 pF
Positive Input Voltage Range ±15V 12.0 13.5 V±5V 2.5 3.5 V
±2.5V 0.5 1.0 V
Negative Input Voltage Range ±15V –13.5 –12.0 V±5V –3.5 – 2.5 V
±2.5V –1.0 – 0.5 V
CMRR Common Mode Rejection Ratio VCM = ±12V ±15V 80 94 dBVCM = ±2.5V ±5V 78 86 dBVCM = ±0.5V ±2.5V 68 77 dB
PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 90 106 dB
ABSOLUTE MAXIMUM RATINGS
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Total Supply Voltage (V + to V –) .............................. 36VDifferential Input Voltage (Transient Only, Note 2) ±10VInput Voltage .......................................................... ±VSOutput Short-Circuit Duration (Note 3) ........... IndefiniteOperating Temperature Range ................ –40°C to 85°C
Specified Temperature Range (Note 7) .. –40°C to 85°CMaximum Junction Temperature (See Below)
Plastic Package ............................................... 150°CStorage Temperature Range ................. –65°C to 150°CLead Temperature (Soldering, 10 sec).................. 300°C
ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted
PACKAGE/ORDER INFORMATION
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ORDER PARTNUMBER
ORDER PARTNUMBER
LT1352CN8LT1352CS8LT1352IN8LT1352IS8
LT1353CS
TOP VIEW
S PACKAGE14-LEAD PLASTIC SO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
CB
DA
TJMAX = 150°C, θJA = 150°C/ W
S8 PART MARKING
13521352I
1
2
3
4
8
7
6
5
TOP VIEW
OUT A
–IN A
+IN A
V–
V+
OUT B
–IN B
+IN B
N8 PACKAGE8-LEAD PDIP
S8 PACKAGE8-LEAD PLASTIC SO
B
A
TJMAX = 150°C, θJA = 130°C/ W (N8)TJMAX = 150°C, θJA = 190°C/ W (S8)
(Note 1)
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SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS
AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k ±15V 40 80 V/mVVOUT = ±10V, RL = 2k ±15V 30 60 V/mVVOUT = ±10V, RL = 1k ±15V 20 40 V/mVVOUT = ±2.5V, RL = 5k ±5V 30 60 V/mVVOUT = ±2 .5V, RL = 2k ±5V 25 50 V/mVVOUT = ±2.5V, RL = 1k ±5V 15 30 V/mVVOUT = ±1V, RL = 5k ±2.5V 20 40 V/mV
VOUT Output Swing RL = 5k, VIN = ±10mV ±15V 13.5 14.0 ±VRL = 2k, VIN = ±10mV ±15V 13.4 13.8 ±VRL = 1k, VIN = ±10mV ±15V 13.0 13.4 ±VRL = 1k, VIN = ±10mV ±5V 3.5 4.0 ±VRL= 500Ω, VIN = ±10mV ±5V 3.4 3.8 ±VRL = 5k, VIN = ±10mV ±2.5V 1.3 1.7 ±V
IOUT Output Current VOUT = ±13V ±15V 13.0 13.4 mAVOUT = ±3.4V ±5V 6.8 7.6 mA
ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 30 45 mA
SR Slew Rate AV = –1, RL = 5k (Note 4) ±15V 120 200 V/µs±5V 30 50 V/µs
Full-Power Bandwidth 10V Peak (Note 5) ±15V 3.2 MHz3V Peak (Note 5) ±5V 2.6 MHz
GBW Gain Bandwidth f = 200kHz, RL = 10k ±15V 2.0 3.0 MHz± 5V 1.8 2.7 MHz
± 2.5V 2.5 MHz
tr, tf Rise Time, Fall Time AV = 1, 10% to 90%, 0.1V ±15V 46 ns±5V 53 ns
Overshoot AV = 1, 0.1V ±15V 13 %±5V 16 %
Propagation Delay 50% VIN to 50% VOUT, 0.1V ±15V 41 ns±5V 52 ns
ts Settling Time 10V Step, 0.1%, AV = –1 ±15V 700 ns10V Step, 0.01%, AV = –1 ±15V 1250 ns5V Step, 0.1%, AV = –1 ±5V 950 ns5V Step, 0.01%, AV = –1 ±5V 1400 ns
RO Output Resistance AV = 1, f = 20kHz ±15V 1.5 ΩChannel Separation VOUT = ±10V, RL = 2k ±15V 101 120 dB
IS Supply Current Each Amplifier ±15V 250 320 µAEach Amplifier ±5V 230 300 µA
ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted
SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS
VOS Input Offset Voltage ±15V 0.8 mV±5V 0.8 mV
±2.5V 1.0 mV
Input VOS Drift (Note 6) ±2.5V to ±15V 3 8 µV/°C
IOS Input Offset Current ±2.5V to ±15V 20 nA
IB Input Bias Current ±2.5V to ±15V 75 nA
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted
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0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted
SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS
CMRR Common Mode Rejection Ratio VCM = ±12V ±15V 78 dBVCM = ±2.5V ±5V 77 dBVCM = ±0.5V ±2.5V 67 dB
PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 89 dB
AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k ±15V 25 V/mVVOUT = ±10V, RL = 2k ±15V 20 V/mVVOUT = ±2.5V, RL = 5k ±5V 20 V/mVVOUT = ±2 .5V, RL = 2k ±5V 15 V/mVVOUT = ±2.5V, RL = 1k ±5V 10 V/mVVOUT = ±1V, RL = 5k ±2.5V 15 V/mV
VOUT Output Swing RL = 5k, VIN = ±10mV ±15V 13.4 ±VRL = 2k, VIN = ±10mV ±15V 13.3 ±VRL = 1k, VIN = ±10mV ±15V 12.0 ±VRL = 1k, VIN = ±10mV ±5V 3.4 ±VRL= 500Ω, VIN = ±10mV ±5V 3.3 ±VRL = 5k, VIN = ±10mV ±2.5V 1.2 ±V
IOUT Output Current VOUT = ±12V ±15V 12.0 mAVOUT = ±3.3V ±5V 6.6 mA
ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 24 mA
SR Slew Rate AV = –1, RL = 5k (Note 4) ±15V 100 V/µs±5V 21 V/µs
GBW Gain Bandwidth f = 200kHz, RL = 10k ±15V 1.8 MHz± 5V 1.6 MHz
Channel Separation VOUT = ±10V, RL = 2k ±15V 100 dB
IS Supply Current Each Amplifier ±15V 350 µAEach Amplifier ±5V 330 µA
ELECTRICAL CHARACTERISTICS
–40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)
SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS
VOS Input Offset Voltage ±15V 1.0 mV±5V 1.0 mV
±2.5V 1.2 mV
Input VOS Drift (Note 6) ±2.5V to ±15V 3 8 µV/°C
IOS Input Offset Current ±2.5V to ±15V 50 nA
IB Input Bias Current ±2.5V to ±15V 100 nA
CMRR Common Mode Rejection Ratio VCM = ±12V ±15V 76 dBVCM = ±2.5V ±5V 76 dBVCM = ±0.5V ±2.5V 66 dB
PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 87 dB
AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k ±15V 20 V/mVVOUT = ±10V, RL = 2k ±15V 15 V/mVVOUT = ±2.5V, RL = 5k ±5V 15 V/mVVOUT = ±2 .5V, RL = 2k ±5V 10 V/mVVOUT = ±2.5V, RL = 1k ±5V 8 V/mVVOUT = ±1V, RL = 5k ±2.5V 10 V/mV
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ELECTRICAL CHARACTERISTICS – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)
SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS
VOUT Output Swing RL = 5k, VIN = ±10mV ±15V 13.3 ±VRL = 2k, VIN = ±10mV ±15V 13.2 ±VRL = 1k, VIN = ±10mV ±15V 10.0 ±VRL = 1k, VIN = ±10mV ±5V 3.3 ±VRL= 500Ω, VIN = ±10mV ±5V 3.2 ±VRL = 5k, VIN = ±10mV ±2.5V 1.1 ±V
IOUT Output Current VOUT = ±10V ±15V 10.0 mAVOUT = ±3.2V ±5V 6.4 mA
ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 20 mA
SR Slew Rate AV = –1, RL = 5k (Note 4) ±15V 50 V/µs±5V 15 V/µs
GBW Gain Bandwidth f = 200kHz, RL = 10k ±15V 1.6 MHz± 5V 1.4 MHz
Channel Separation VOUT = ±10V, RL = 2k ±15V 99 dB
IS Supply Current Each Amplifier ±15V 380 µAEach Amplifier ±5V 350 µA
Note 1: Absolute Maximum Ratings are those values beyond which the lifeof a device may be impaired.Note 2: Differential inputs of ±10V are appropriate for transient operationonly, such as during slewing. Large, sustained differential inputs will causeexcessive power dissipation and may damage the part. See InputConsiderations in the Applications Information section of this data sheetfor more details.Note 3: A heat sink may be required to keep the junction temperaturebelow absolute maximum when the output is shorted indefinitely.Note 4: Slew rate is measured between ±8V on the output with ±12V
input for ±15V supplies and ±2V on the output with ±3V input for ±5Vsupplies.Note 5: Full-power bandwidth is calculated from the slew ratemeasurement: FPBW = (Slew Rate)/2πVP.Note 6: This parameter is not 100% tested.Note 7: The LT1352C/LT1353C are guaranteed to meet specifiedperformance from 0°C to 70°C. The LT1352C/LT1353C are designed,characterized and expected to meet specified performance from–40°C to 85°C but are not tested or QA sampled at these temperatures.The LT1352I/LT1353I are guaranteed to meet specified performancefrom –40°C to 85°C.
TYPICAL PERFORMANCE CHARACTERISTICS
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SUPPLY VOLTAGE (±V)0
SUPP
LY C
URRE
NT P
ER A
MPL
IFIE
R (µ
A)
200
250
125°C
25°C
–55°C
20
1352/53 G01
150
1005 10 15
350
300
Supply Current vs Supply Voltageand Temperature
SUPPLY VOLTAGE (±V)0
V–
COM
MON
MOD
E RA
NGE
(V)
0.5
1.5
2.0
V+
–1.5
10 20
1352/53 G02
1.0
–1.0
–0.5
–2.0
5 15
TA = 25°C∆VOS = 1mV
Input Common Mode Rangevs Supply Voltage
INPUT COMMON MODE VOLTAGE (V)–15
–20
INPU
T BI
AS C
URRE
NT (n
A)
–10
0
10
20
30
–10 –5 0 5
1352/53 G03
10 15
TA = 25°CVS = ±15V
IB =IB
+ + IB–
2
Input Bias Currentvs Input Common Mode Voltage
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TYPICAL PERFORMANCE CHARACTERISTICS
UW
Input Bias Current vs Temperature Open-Loop Gain vs Resistive LoadInput Noise Spectral Density
TEMPERATURE (°C)–50
0
INPU
T BI
AS C
URRE
NT (n
A)
4
12
16
20
40
28
0 50 75
1352/53 G04
8
32
36
24
–25 25 100 125
VS = ±15V
IB =IB
+ + IB–
2
LOAD RESISTANCE (Ω)
1060
OPEN
-LOO
P GA
IN (d
B)
90
100
110
100 1k 10k
1352/53 G06
80
70
TA = 25°C
VS = ±5V
VS = ±15V
FREQUENCY (Hz)
1
10
en
100
0.1
1
10
10 100
1352/53 G05
INPU
T VO
LTAG
E NO
ISE
(nV/
√Hz)
INPUT CURRENT NOISE (pA/√Hz)
1 1k 10k
in
TA = 25°CVS = ±15VAV = 101RS = 100k
Output Voltage Swingvs Load Current
Output Voltage Swingvs Supply VoltageOpen-Loop Gain vs Temperature
TEMPERATURE (°C)–50
OPEN
-LOO
P GA
IN (d
B)
98
99
100
25 75
1352/53 G07
97
96
–25 0 50 100 125
95
94
VS = ±15VVO = ±12VRL = 5k
OUTPUT CURRENT (mA)–20
V–
OUTP
UT V
OLTA
GE S
WIN
G (V
)
0.5
1.5
2.0
V+
25°C
25°C–1.5
–10 0 5
1352/53 G09
1.0
–1.0
–0.5
–2.0
–15 –5 10 15 20
VS = ±5VVIN = 10mV 85°C
85°C
–40°C
–40°C
–40°C –40°C
85°C
85°C
25°C
25°C
SUPPLY VOLTAGE (V)0
–3
–2
V+
15
1352/53 G08
3
2
5 10 20
1
V–
–1
OUTP
UT V
OLTA
GE S
WIN
G (V
)
TA = 25°CVIN = ±10mV
RL = 2k
RL = 2k
RL = 1k
RL = 1k
Settling Time vs Output Step(Inverting)
Settling Time vs Output Step(Noninverting)
Output Short-Circuit Currentvs Temperature
TEMPERATURE (°C)–50
45
50
60
SINK
25 75
1352/53 G10
40
35
–25 0 50 100 125
30
25
55
OUTP
UT S
HORT
-CIR
CUIT
CUR
RENT
(mA)
SOURCE
VS = ±15V
SETTLING TIME (µs)0.7
–10
OUTP
UT S
TEP
(V)
–8
–4
–2
0
10
4
0.9 1.1 1.2 1.6
1352/53 G11
–6
6
8
2
0.8 1 1.3 1.4 1.5
VS = ±15VAV = 1OUTPUTFILTER:1.6MHzLPF
10mV
10mV 1mV
1mV
SETTLING TIME (µs)0.5
OUTP
UT S
TEP
(V)
2
6
10
1.3
1352/53 G12
–2
–6
0
4
8
–4
–8
–100.7 0.9 1.10.6 1.40.8 1.0 1.2 1.5
VS = ±15VAV = –1RG = RF = 2kCF = 5pFRL = 2k
10mV 1mV
1mV10mV
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TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)–50
2.00
GAIN
BAN
DWID
TH (M
Hz) PHASE M
ARGIN (DEG)
2.25
2.75
3.00
3.25
4.50
3.75
0 50 75
1352/53 G16
2.50
4.00
4.25
3.50
30
32
36
38
40
50
44
34
46
48
42
–25 25 100 125
VS = ±15V
VS = ±5V
VS = ±15V
VS = ±5V
PHASE MARGIN
GAIN BANDWIDTH
Gain Bandwidth and Phase Marginvs Temperature
Frequency Responsevs Supply Voltage (AV = –1)
FREQUENCY (Hz)10k
–1GAIN
(dB)
0
1
2
3
100k 1M 10M
1352/53 G18
–2
–3
–4
–5
4
5TA = 25°CAV = –1RF = RG = 5k
±15V±5V
±2.5V
Frequency Responsevs Capacitive Load
FREQUENCY (Hz)10k
–2GAIN
(dB)
0
2
4
6
100k 1M 10M
1352/53 G15
–4
–6
–8
–10
8
10TA = 25°CVS = ±15VAV = –1RFB = RG = 5k
C = 500pFC = 100pF
C = 5000pF
C = 1000pF
C = 10pF
Output Impedance vs Frequency
FREQUENCY (Hz)
0.1
OUTP
UT IM
PEDA
NCE
(Ω)
1
10
100
1000
1k 100k 1M 10M
1352/53 G14
0.0110k
TA = 25°CVS = ±15V
AV = 100AV = 10 AV = 1
Gain and Phase vs Frequency
FREQUENCY (Hz)
10
GAIN
(dB)
PHASE (DEG)20
40
60
70
1k 100k 1M 100M
1352/53 G13
0
10k 10M
50
30
–10
0
20
60
100
120
–20
80
40
–40
PHASE
GAIN
VS = ±15V
TA = 25°CAV = –1RF = RG = 5k
VS = ±15V
VS = ±5VVS = ±5V
FREQUENCY (Hz)10k
–1GAIN
(dB)
0
1
2
3
100k 1M 10M
1352/53 G17
–2
–3
–4
–5
4
5TA = 25°CAV = 1RL = 5k
±15V±5V
±2.5V
Frequency Responsevs Supply Voltage (AV = 1)
FREQUENCY (Hz)10
0
POW
ER S
UPPL
Y RE
JECT
ION
RATI
O (d
B)
20
40
60
80
120
100 1k 10k 100k
1352/53 G20
1M 10M
100
TA = 25°CVS = ±15V
–PSRR = +PSRR
SUPPLY VOLTAGE (±V)0
2.00
GAIN
BAN
DWID
TH (M
Hz) PHASE M
ARGIN (DEG)
2.25
2.75
3.00
4.50
3.75
10 20
1352/53 G19
2.50
4.00
4.25
3.50
3.25
30
32
36
38
50
44
34
46
48
42
40
5 15
TA = 25°C
PHASE MARGIN
GAIN BANDWIDTH
Gain Bandwidth and Phase Marginvs Supply Voltage
Power Supply Rejection Ratiovs Frequency
Common Mode Rejection Ratiovs Frequency
FREQUENCY (Hz)100
0
COM
MON
MOD
E RE
JECT
ION
RATI
O (d
B)
20
40
60
80
100
120
1k 10k 100k 1M
1352/53 G21
10M
TA = 25°CVS = ±15V
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TYPICAL PERFORMANCE CHARACTERISTICS
UW
SUPPLY VOLTAGE (±V)0
0
SLEW
RAT
E (V
/µs)
50
100
150
200
5 10
1352/53 G22
15
TA = 25°CAV = –1RF = RG = 5kSR = (SR+ + SR–)/2
Slew Rate vs Supply Voltage
INPUT LEVEL (VP-P)0
SLEW
RAT
E (V
/µs)
75
100
125
12 20
1352/53 G24
50
25
04 8 16
150
175
200
24
TA = 25°CVS = ±15VAV = –1RFB = RG = 5kSR = (SR+ + SR–)/2
TEMPERATURE (°C)–50 –25
0
SLEW
RAT
E (V
/µs)
100
250
0 50 75
1352/53 G23
50
200
150
25 100 125
AV = –1RF = RG = RL = 5kSR = (SR+ + SR–)/2
VS = ±15V
VS = ±5V
Slew Rate vs Temperature Slew Rate vs Input Level
Total Harmonic Distortionvs Frequency
FREQUENCY (Hz)10
TOTA
L HA
RMON
IC D
ISTO
RTIO
N (%
)
0.01
0.1
1
100 1k 10k 100k
1352/53 G25
0.001
TA = 25°CVS = ±15VRL = 5kVO = 2VP-P
AV = –1
AV = 1
Undistorted Output Swingvs Frequency (±15V)
FREQUENCY (Hz)10k
0
OUTP
UT V
OLTA
GE (V
P-P)
5
10
15
20
30
100k 1M
1352/53 G26
25
VS = ±15VRL = 5kTHD = 1%
AV = –1
AV = 1
Undistorted Output Swingvs Frequency (±5V)
FREQUENCY (Hz)10k
0
OUTP
UT V
OLTA
GE (V
P-P)
2
4
6
8
1
3
5
7
9
100k 1M
1352/53 G27
10
VS = ±5VRL = 5kTHD = 1%
AV = 1
AV = –1
2nd and 3rd Harmonic Distortionvs Frequency Capacitive Load Handling
FREQUENCY (Hz)100k
HARM
ONIC
DIS
TORT
ION
(dB)
–30
–40
–50
–60
–70
–80
–901M
1352/53 G28
3RD HARMONIC
2ND HARMONIC
VS = ±15VAV = 1RL = 5kVO = 2VP-P
FREQUENCY (Hz)
–100
CROS
STAL
K (d
B)
–90
–70
–50
– 40
100 10k 100k 10M
1352/53 G29
–110
1k 1M
–60
–80
–120
TA = 25°CAV = 1RL = 1kVIN = 15dBm
CAPACITIVE LOAD (F)10p
40
OVER
SHOO
T (%
)
50
60
70
80
100p 1n 10n 0.1µ 1µ
1352/53 G30
30
20
10
0
90
100TA = 25°CVS = ±15VRL = 5k
AV = 1
AV = –1
Crosstalk vs Frequency
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LT1352/LT1353
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TYPICAL PERFORMANCE CHARACTERISTICS
UW
Small-Signal Transient(AV = 1)
Small-Signal Transient(AV = –1)
Small-Signal Transient(AV = –1, CL = 1000pF)
1352/53 G331352/53 G321352/53 G31
Large-Signal Transient(AV = 1)
Large-Signal Transient(AV = –1)
Large-Signal Transient(AV = 1, CL = 10,000pF)
1352/53 G361352/53 G351352/53 G34
APPLICATIONS INFORMATION
WU UU
Layout and Passive Components
The LT1352/LT1353 amplifiers are easy to use and toler-ant of less than ideal layouts. For maximum performance(for example, fast 0.01% settling) use a ground plane,short lead lengths and RF-quality bypass capacitors (0.01µFto 0.1µF). For high drive current applications use low ESRbypass capacitors (1µF to 10µF tantalum).
The parallel combination of the feedback resistor andgain setting resistor on the inverting input can combinewith the input capacitance to form a pole which can causepeaking or even oscillations. If feedback resistors greaterthan 10k are used, a parallel capacitor of value, CF >(RG)(CIN/RF), should be used to cancel the input pole andoptimize dynamic performance. For applications wherethe DC noise gain is one and a large feedback resistor isused, CF should be greater than or equal to CIN. Anexample would be an I-to-V converter as shown in theTypical Applications section.
Capacitive Loading
The LT1352/LT1353 are stable with any capacitive load.As the capacitive load increases, both the bandwidth andphase margin decrease so there will be peaking in thefrequency domain and in the transient response. Graphsof Frequency Response vs Capacitive Load, CapacitiveLoad Handling and the transient response photos clearlyshow these effects.
Input Considerations
Each of the LT1352/LT1353 inputs is the base of an NPNand a PNP transistor whose base currents are of oppositepolarity and provide first-order bias current cancellation.Because of variation in the matching of NPN and PNP beta,the polarity of the input bias current can be positive ornegative. The offset current does not depend on NPN/PNPbeta matching and is well controlled. The use of balancedsource resistance at each input is recommended for
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LT1352/LT1353
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APPLICATIONS INFORMATION
WU UU
applications where DC accuracy must be maximized. Theinputs can withstand transient differential input voltagesup to 10V without damage and need no clamping or sourceresistance for protection. Differential inputs, however,generate large supply currents (tens of mA) as required forhigh slew rates. If the device is used with sustaineddifferential inputs, the average supply current will in-crease, excessive power dissipation will result and the partmay be damaged. The part should not be used as acomparator, peak detector or other open-loop applica-tion with large, sustained differential inputs. Undernormal, closed-loop operation, an increase of power dis-sipation is only noticeable in applications with large slewingoutputs and is proportional to the magnitude of thedifferential input voltage and the percent of time that theinputs are apart. Measure the average supply current forthe application in order to calculate the power dissipation.
Circuit Operation
The LT1352/LT1353 circuit topology is a true voltagefeedback amplifier that has the slewing behavior of acurrent feedback amplifier. The operation of the circuit canbe understood by referring to the Simplified Schematic.
The inputs are buffered by complementary NPN and PNPemitter followers which drive R1, a 1k resistor. The inputvoltage appears across the resistor generating currentswhich are mirrored into the high impedance node andcompensation capacitor CT. Complementary followersform an output stage which buffers the gain node from theload. The output devices Q19 and Q22 are connected toform a composite PNP and a composite NPN.
The bandwidth is set by the input resistor and the capaci-tance on the high impedance node. The slew rate isdetermined by the current available to charge the highimpedance node capacitance. This current is the differen-tial input voltage divided by R1, so the slew rate isproportional to the input. Highest slew rates are thereforeseen in the lowest gain configurations. For example, a 10Voutput step in a gain of 10 has only a 1V input step whereasthe same output step in unity gain has a 10 times greater
input step. The graph Slew Rate vs Input Level illustratesthis relationship. In higher gain configurations the large-signal performance and the small-signal performanceboth look like a single pole response.
Capacitive load compensation is provided by the RC, CCnetwork which is bootstrapped across the output stage.When the amplifier is driving a light load the network hasno effect. When driving a capacitive load (or a low valueresistive load) the network is incompletely bootstrappedand adds to the compensation at the high impedancenode. The added capacitance slows down the amplifierand a zero is created by the RC combination, both of whichimprove the phase margin. The design ensures that evenfor very large load capacitances, the total phase lag cannever exceed 180 degrees (zero phase margin) and theamplifier remains stable.
Power Dissipation
The LT1352/LT1353 combine high speed and large outputdrive in small packages. Because of the wide supplyvoltage range, it is possible to exceed the maximumjunction temperature of 150°C under certain conditions.Maximum junction temperature TJ is calculated from theambient temperature TA and power dissipation PD asfollows:
LT1352CN8: TJ = TA + (PD)(130°C/W)LT1352CS8: TJ = TA + (PD)(190°C/W)LT1353CS: TJ = TA + (PD)(150°C/W)
Worst-case power dissipation occurs at the maximumsupply current and when the output voltage is at 1/2 ofeither supply voltage (or the maximum swing if less than1/2 supply voltage). For each amplifier PD(MAX) is:
PD(MAX) = (V+ – V–)(IS(MAX)) + (V+/2)2/RL or(V+ – V –)(IS(MAX)) + (V+ – VMAX)(IMAX)
Example: LT1353 in S14 at 85°C, VS = ±15V, RL = 500Ω,VOUT = ±5V (±10mA)
PD(MAX) = (30V)(380µA) + (15V – 5V)(10mA) = 111mWTJ = 85°C + (4)(111mW)(150°C/W) = 152°C
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LT1352/LT1353
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SI PLIFIED SCHE ATIC
W W
R3
R6
R7
RC
R2
R5R4
Q21
OUTPUT
1352/53 SS
Q22Q13
Q15
Q18
+IN–IN
V+
V–
Q12Q11
Q9
Q17
Q16
Q10
Q14 Q23
C1
C2
CC
CT
Q1Q2
Q4
Q3R11k
Q8
Q7
Q6Q5
Q19
Q20
Q24
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LT1352/LT1353
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TYPICAL APPLICATIONS
U
–
+
1/2LT1352
1.5k 10k
10k
1N5712
BPV22NF VOUT
1352/53 TA05
10nF
10k
10nF
–
+
1/2LT1352
DAC I-to-V Converter
400kHz Photodiode Preamp with 10kHz Highpass Loop
–
+
1/2LT1352565A TYPE
12DAC
INPUTS
5k
5k
10pF
VOUT
1352/53 TA03VOS + IOS (5kΩ) + < 0.5LSB
VOUTAVOL
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LT1352/LT1353
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N8 Package8-Lead PDIP (Narrow .300 Inch)(Reference LTC DWG # 05-08-1510)
PACKAGE DESCRIPTION
U
N8 1002
.065(1.651)
TYP
.045 – .065(1.143 – 1.651)
.130 ± .005(3.302 ± 0.127)
.020(0.508)
MIN.018 ± .003(0.457 ± 0.076)
.120(3.048)
MIN
1 2 3 4
8 7 6 5
.255 ± .015*(6.477 ± 0.381)
.400*(10.160)
MAX
.008 – .015(0.203 – 0.381)
.300 – .325(7.620 – 8.255)
.325+.035–.015+0.889–0.3818.255( )
NOTE:1. DIMENSIONS ARE
INCHESMILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100(2.54)BSC
14
LT1352/LT1353
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.016 – .050(0.406 – 1.270)
.010 – .020(0.254 – 0.508)
× 45°
0°– 8° TYP.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069(1.346 – 1.752)
.014 – .019(0.355 – 0.483)
TYP
.004 – .010(0.101 – 0.254)
.050(1.270)
BSC
1 2 3 4
.150 – .157(3.810 – 3.988)
NOTE 3
8 7 6 5
.189 – .197(4.801 – 5.004)
NOTE 3
.228 – .244(5.791 – 6.197)
.245MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005 .050 BSC
.030 ±.005 TYP
INCHES(MILLIMETERS)
NOTE:1. DIMENSIONS IN
2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
S8 Package8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
PACKAGE DESCRIPTION
U
15
LT1352/LT1353
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
S Package14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
1
N
2 3 4
.150 – .157(3.810 – 3.988)
NOTE 3
14 13
.337 – .344(8.560 – 8.738)
NOTE 3
.228 – .244(5.791 – 6.197)
12 11 10 9
5 6 7
N/2
8
.016 – .050(0.406 – 1.270)
.010 – .020(0.254 – 0.508)
× 45°
0° – 8° TYP.008 – .010
(0.203 – 0.254)
S14 0502
.053 – .069(1.346 – 1.752)
.014 – .019(0.355 – 0.483)
TYP
.004 – .010(0.101 – 0.254)
.050(1.270)
BSC
.245MIN
N
1 2 3 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005 .050 BSC
.030 ±.005 TYP
INCHES(MILLIMETERS)
NOTE:1. DIMENSIONS IN
2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
PACKAGE DESCRIPTION
U
16
LT1352/LT1353
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–
+
1/2LT1352
11.3k5.49k
13.3k4.64k
4.64k
5.49k
220pF
VOUT
VIN
1352/53 TA04
470pF
2200pF
4700pF
–
+
1/2LT1352
20kHz, 4th Order Butterworth Filter
TYPICAL APPLICATIONS
U
LINEAR TECHNOLOGY CORPORATION 1996
LT/TP 0603 1K REV A • PRINTED IN USA
RELATED PARTSPART NUMBER DESCRIPTION COMMENTSLT1351 250µA, 3MHz, 200V/µs Op Amp Good DC Precision, C-Load Stable, Power Saving ShutdownLT1354/55/56 Single/Dual/Quad 1mA, 12MHz, 400V/µs Op Amp Good DC Precision, Stable with All Capacitive Loads
Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 FAX: (408) 434-0507 www.linear.com