LT1990-10
250V Input Range,
100kHz, G =10, Micropower,
Difference Amplifier
FEATURES DESCRIPTION
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Gain = 10 The LT 1990-10 is a micropower precision difference am-
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3dB Bandwidth = 100kHz plifier with a very high common mode input voltage range,
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High Common Mode Voltage Range: a fixed gain of 10 and 100kHz bandwidth. The LT1990-10
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250V (V = 15V) operates over a 250V common mode voltage range on a
S
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85V Window (V = 5V, 0V) 15V supply. The inputs are fault protected from common
S
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Common Mode Rejection Ratio: 60dB Min mode voltage transients up to 350V and differential
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Input Protection to 350V voltages up to 500V. The LT1990-10 is ideally suited for
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Gain Error: 0.8% Max both high side and low side current or voltage monitoring.
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PSRR: 82dB Min
On a single 5V supply, the LT1990-10 has an adjustable
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High Input Impedance: 2M Differential,
85V input range, 60dB min CMRR and draws less than
500k Common Mode
180A supply current. The rail-to-rail output maximizes
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Micropower: 180A Max Supply Current
the dynamic range, especially important for single sup-
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Wide Supply Range: 2.7V to 36V
plies as low as 2.7V.
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Rail-to-Rail Output
n The LT1990-10 is specified for single 3V, 5V and 15V
8-pin SO and pin FMEA Compatible MSOP Packages
supplies over the industrial temperature range.
APPLICATIONS
The LT1990-10 is available in the 8-pin SO and pin FMEA
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compatible MSOP packages.
Battery Cell Voltage Monitoring
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High Voltage Current Sensing
All registered trademarks and trademarks are the property of their respective owners.
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Signal Acquisition in Noisy Environments
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Input Protection
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Fault Protected Front Ends
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Level Sensing
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Isolation
TYPICAL APPLICATION
Full-Bridge Load Current Monitor
+V
SOURCE
5V
LT1990-10
900k 10k
100k
1M
R
S
V
OUT
+
1M
+
I V = 1.5V
REF
L
10k
IN OUT
54.9k 1nF
LT6650
40k
900k
100k
40k
GND FB
20k
12V V 73V
CM
V = V (10 I R ) 199010 TA01
OUT REF L S
1F
Rev 0
1
For more information www.analog.comLT1990-10
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
+
Total Supply Voltage (V to V ).................................36V Operating Temperature Range (Note 4)
Input Voltage Range LT1990I-10 ......................................... 55C to 125C
Each Input Continuous ......................................250V Specified Temperature Range (Note 5)
Each Input Transient (0.1s) ................................350V LT1990I-10 ...........................................40C to 85C
Differential ........................................................500V Junction Temperature ........................................... 150C
Output Short-Circuit Duration (Note 3) ............ Indefinite Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec.) ..................300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
REF 1 8 NC
IN 1 8 REF
+
+ IN 2 7 V
NC 2 7 V
NC 3 6 OUT
+IN 3 6 OUT
+IN 5
4 V
V 4 5 NC
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S8 PACKAGE
8-LEAD PLASTIC SO
T = 150C, = 250C/W
JMAX JA
T = 150C, = 190C/W
JMAX JA
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1990IS8-10#PBF LT1990IS8-10#TRPBF 199010 8-Lead Plastic SO 40C to 85C
LT1990IMS8-10#PBF LT1990IMS8-10#TRPBF LTHBQ 8-Lead Plastic MSOP 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on tape and reel specifications, go to: Tape and reel specifications. Some packages are available in 500 unit reels through designated
sales channels with #TRMPBF suffix.
Rev 0
2
For more information www.analog.com