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PDF LT1997-3 Data sheet ( Hoja de datos )
| Número de pieza | LT1997-3 | |
| Descripción | Wide Voltage Range Gain Selectable Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
nn Pin Configurable as a Difference Amplifier, Inverting
Amplifier or Noninverting Amplifier
nn 91dB Minimum DC CMRR (Gain = 1)
nn 65dB AC CMRR (at 100kHz, Gain = 1)
nn 0.006% (60ppm) Maximum Gain Error (Gain = 1)
nn 1ppm/°C Maximum Gain Error Drift
nn 2ppm Maximum Gain Nonlinearity
nn ±160V Common Mode Voltage Range
nn Wide Supply Voltage Range: 3.3V to 50V
nn Rail-to-Rail Output
nn 350µA Supply Current
nn 60µV Maximum Op Amp Offset Voltage
nn 1.1MHz –3dB Bandwidth (Gain = 1)
nn Low-Power Shutdown: 20µA
nn Space-Saving MSOP and DFN Packages
Applications
nn High Side or Low Side Current Sensing
nn Bidirectional Wide Common Mode Range Current
Sensing
nn High Voltage to Low Voltage Level Translation
nn Industrial Data-Acquisition Front-Ends
nn Replacement for Isolation Circuits
nn Differential to Single-Ended Conversion
LT1997-3
Precision, Wide Voltage
Range Gain Selectable
Amplifier
Description
The LT®1997-3 combines a precision operational amplifier
with highly-matched resistors to form a one-chip solution
for accurately amplifying voltages. Gains from –13 to +14
with accuracy of 0.006% (60ppm) can be achieved using
no external components. The LT1997-3 is particularly well
suited for use as a difference amplifier, where the excellent
resistor matching results in a common mode rejection
ratio of greater than 91dB.
The amplifier features a 60μV maximum input offset voltage
and a –3dB bandwidth of 1.1MHz (Gain = 1). The LT1997-3
operates from any supply voltage from 3.3V to 50V and
draws only 350μA supply current. The output typically
swings to within 100mV of either supply rail.
The resistors maintain their excellent matching over
temperature; the matching temperature coefficient is
guaranteed less than 1ppm/°C. The resistors are extremely
linear with voltage, resulting in a gain nonlinearity of less
than 2ppm.
The LT1997-3 is fully specified at 5V and ±15V supplies
and from –40°C to 125°C. The device is available in space
saving 16-lead MSOP and 4mm × 4mm DFN14 packages.
L, LT, LTC, LTM, Linear Technology, Over-The-Top and the Linear logo are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
Typical Application
VSOURCE = –28V TO 26.5V
Gain = 1 Difference Amplifier
15V
–INA –INB –INC
V+ LT1997-3
2.5k
7.5k 22.5k
RSENSE
1Ω
22.5k
RC
1Ω 22.5k
–
+ OUT VOUT = ±1mV/mA
LOAD
7.5k
2.5k
45k REF2
45k REF1
+INA +INB +INC
SHDN V–
–15V
19973 TA01a
For more information www.linear.com/LT1997-3
Typical Distribution of CMRR (G = 1)
1200
1000
800
VS = ±15V
VCM = –28V TO +26.5V
4625 UNITS
FROM 3 RUNS
600
400
200
0
–30
–20 –10 0 10
CMRR (µV/V = ppm)
20 30
19973 TA01b
19973f
1
1 page  
LT1997-3
E lectrical Characteristics The l denotes the specifications which apply over the full operating
ctTeoAmm =p m2e5ora°nCtum.rDeodirfeafenvrgoeelnt,ca–eg4eA0mo°fCptlh<iefTieiAnr <tCeo8rnn5af°iClgoufporaratIim-ognpr,.aVde+
parts, –40°C <
= 5V, V– = 0V,
TA < 125°C
VCM = VOUT
for H-grade parts, otherwise specifications are at
= VREF = VREF1 = VREF2 = Mid-Supply. VCMOP is the
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
∆G Gain Error
VOUT = 1V to 4V
G = 1
±0.001 ±0.006
%
l
±0.012
%
G = 3
±0.001 ±0.015
%
l
±0.02
%
G = 9
±0.002 ±0.03
%
l
±0.04
%
∆G/∆T
GNL
VOS
Gain Drift vs Temperature (Note 6)
Gain Nonlinearity
Op Amp Offset Voltage (Note 9)
∆VOS/∆T Op Amp Offset Voltage Drift (Note 6)
IB Op Amp Input Bias Current
IOS Op Amp Input Offset Current
VOUT = 1V to 4V
VOUT = 1V to 4V
V– < VCMOP < V+ – 1.75V
V– < VCMOP < V+ – 1.75V
V– + 0.25V < VCMOP < V+ – 1.75V
V– + 0.25V < VCMOP < V+ – 1.75V
l
l
l
–5
l –15
–3
l –10
±0.2 ±1 ppm/°C
±1 ppm
±20 ±60
±200
µV
µV
±0.5 ±1.5
µV/°C
±2 5
15
nA
nA
±0.5 3
10
nA
nA
RIN Input Impedance (Note 8)
Common Mode
G = 1
G = 3
G = 9
l 19 22.5 26
l 12.6 15 17.4
l 10.5 12.5 14.5
kΩ
kΩ
kΩ
Differential
G = 1
G = 3
G = 9
l
l 38 45 52
l 12.6 15 17.4
l 4.2 5 5.8
kΩ
kΩ
kΩ
CMRR
Common Mode Rejection Ratio,
MS16 Package
G = 1, VCM = –2.5V to +4.0V
90
l 88
100
dB
dB
G = 3, VCM = 0V to +3.5V
90
l 87
103
dB
dB
G = 9, VCM = 0V to +3.3V
96
l 94
108
dB
dB
CMRR
Common Mode Rejection Ratio,
DF14 Package
G = 1, VCM = –2.5V to +4.0V
90
l 88
96
dB
dB
G = 3, VCM = 0V to +3.5V
90
l 87
101
dB
dB
G = 9, VCM = 0V to +3.3V
96
l 94
107
dB
dB
∆R/R
Reference Divider Matching Error
∆R
R
=
RREF1
⎛⎝⎜ RREF 1
– RREF2
+ RREF2
2
⎞⎠⎟
Available in MS16 Package Only
±0.001 ±0.006
%
l
±0.012
%
PSRR
eni
Power Supply Rejection Ratio
Input Referred Noise Voltage Density
VS = ±1.65V to ±25V, VCM = VOUT = Mid-Supply
(Note 9)
f = 1kHz
G = 1
G = 3
G = 9
l
114
124
50
30
22
dB
nV/√Hz
nV/√Hz
nV/√Hz
For more information www.linear.com/LT1997-3
19973f
5
5 Page 
LT1997-3
Tc oynfipguircatiaonl, unPleessrothfeorwirsemnotead.nce Characteristics TA = 25°C, VS = ±15V, Difference Amplifier
Slew Rate vs Temperature
2.0
1.8 RL = 10kΩ
1.6
1.4 RISING EDGE
1.2
1.0
0.8
0.6 FALLING EDGE
0.4
0.2
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
19973 G34
Large-Signal Step Response
G=1
RL = 10kΩ
CL = 560pF
TIME (10µs/DIV)
19973 G35
Small-Signal Step Response
140
120
100
G=1
RL=10kΩ
80
CL = 680pF
60
40
20
0
–20
–40
–60
–80
–100
0
CL = 560pF
CL = 0pF
5 10 15 20 25 30 35 40
TIME (µs)
19973 G36
Small-Signal Step Response
140
120
G=3
RL=10kΩ
100
80
CL = 680pF
CL = 1000pF
60
40
20
0
–20
–40
–60
–80 CL = 0pF CL = 560pF
–100
0 5 10 15 20 25 30 35 40
TIME (µs)
19973 G37
Small-Signal Step Response
140
120
G=9
RL=10kΩ
100
80
CL = 680pF
CL = 1000pF
60
40
20
0
–20
–40
–60
–80 CL = 0pF CL = 560pF
–100
0 5 10 15 20 25 30 35 40
TIME (µs)
19973 G38
Settling Time
6 OUTPUT VOLTAGE
5
4
3
2 ERROR VOLTAGE
1
0
–1
–2
–3
–4
–5
–6
TIME (20µs/DIV)
G=1
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
19973 G39
Settling Time
6
5
4
3
2 ERROR VOLTAGE
1
0
–1
–2
–3
–4 OUTPUT VOLTAGE
–5
–6
TIME (20µs/DIV)
G=1
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
19973 G40
For more information www.linear.com/LT1997-3
19973f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT1997-3.PDF ] | |
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