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Linear Technology Electronic Components Datasheet

LT1990 Datasheet

Difference Amplifier

No Preview Available !

U
APPLICATIO S
Pin Selectable Gain of 1 or 10
High Common Mode Voltage Range:
85V Window (VS = 5V, 0V)
±250V (VS = ±15V)
Common Mode Rejection Ratio: 70dB Min
Input Protection to ±350V
Gain Error: 0.28% Max
PSRR: 82dB Min
High Input Impedance: 2MDifferential,
500kCommon Mode
Micropower: 120µA Max Supply Current
Wide Supply Range: 2.7V to 36V
–3dB Bandwidth: 100kHz
Rail-to-Rail Output
8-Pin SO Package
FEATURES
Battery Cell Voltage Monitoring
High Voltage Current Sensing
Signal Acquisition in Noisy Environments
Input Protection
Fault Protected Front Ends
Level Sensing
Isolation
LT1990
±250V Input Range
G = 1, 10, Micropower,
Difference Amplifier
DESCRIPTIO
The LT®1990 is a micropower precision difference ampli-
fier with a very high common mode input voltage range. It
has pin selectable gains of 1 or 10. The LT1990 operates
over a ±250V common mode voltage range on a ±15V
supply. The inputs are fault protected from common
mode voltage transients up to ±350V and differential
voltages up to ±500V. The LT1990 is ideally suited for both
high side and low side current or voltage monitoring.
On a single 5V supply, the LT1990 has an adjustable 85V
input range, 70dB min CMRR and draws less than 120µA
supply current. The rail-to-rail output maximizes the dy-
namic range, especially important for single supplies as
low as 2.7V.
The LT1990 is specified for single 3V, 5V and ±15V
supplies over both commercial and industrial temperature
ranges. The LT1990 is available in the 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
+VSOURCE
– + RS
IL
–12V VCM 73V
VOUT = VREF ± (10 • IL • RS)
Full-Bridge Load Current Monitor
5V
LT1990
900k
7
IN OUT
LT6650
GND FB
VREF = 1.5V
54.9k
1nF
20k
1µF
2 1M
3 1M
4
+
40k 900k
40k
1
10k 8
100k
6 VOUT
10k 5
100k
1990 TA01
1990f
1


Linear Technology Electronic Components Datasheet

LT1990 Datasheet

Difference Amplifier

No Preview Available !

LT1990
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
Total Supply Voltage (V+ to V) ............................... 36V
Input Voltage Range
Continuous ...................................................... ±250V
Transient (0.1s) ............................................... ±350V
Differential ....................................................... ±500V
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4) ...–40°C to 85°C
Specified Temperature Range (Note 5) ....–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
REF 1
–IN 2
+IN 3
V4
8 GAIN1
7 V+
6 OUT
5 GAIN2
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 190°C/W
ORDER PART
NUMBER
LT1990CS8
LT1990IS8
LT1990ACS8
LT1990AIS8
S8 PART
MARKING
1990
1990A
1990I
1990AI
3V/5V ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V; RL = 10k, VCM = VREF = half supply, G = 1, 10, TA = 25°C, unless otherwise noted. (Note 6)
SYMBOL PARAMETER
CONDITIONS
MIN TYP
G Gain
Pins 5 and 8 = Open
Pins 5 and 8 = GND
1
10
G Gain Error
GNL Gain Nonlinearity
VOUT = 0.5V to (+Vs) –0.75V
LT1990, G = 1
LT1990A, G = 1
G = 10, VS = 5V, 0V
VS = 5V, 0V; VOUT = 0.5V to 4.25V
G=1
G = 10
0.4
0.07
0.2
0.001
0.01
VCM Input Voltage Range
CMRR
Common Mode Rejection Ratio
RTI (Referred to Input)
Guaranteed by CMRR
VS = 3V, 0V; VREF = 1.25V
VS = 5V, 0V; VREF = 1.25V
VS = 5V, 0V; VREF = 2.5V
VS = 3V, 0V (Note 7)
VCM = –5V to 25V, VREF = 1.25V
LT1990
LT1990A
–5
–5
–38
60 68
70 75
VS = 5V, 0V
VCM = –5V to 80V, VREF = 1.25V
LT1990
LT1990A
60 68
70 75
VS = 5V, 0V (Note 7)
VCM = –38V to 47V, VREF = 2.5V
LT1990
LT1990A
60 68
70 75
VOS Offset Voltage, RTI
en Input Noise Voltage, RTI
Noise Voltage Density, RTI
G = 1, 10
fO = 0.1Hz to 10Hz
fO = 1kHz
0.8
22
1
MAX
0.6
0.28
0.8
0.005
25
80
47
3
UNITS
%
%
%
%
%
V
V
V
dB
dB
dB
dB
dB
dB
mV
µVP-P
µV/Hz
1990f
2


Part Number LT1990
Description Difference Amplifier
Maker Linear Technology
PDF Download

LT1990 Datasheet PDF






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