FEATURES
n
n
n
LT1990-10
±250V Input Range,
100kHz, G =10, Micropower,
Difference Amplifier
DESCRIPTION
The
LT
®
1990-10
is a micropower precision difference am-
plifier with a very high common mode input voltage range,
a fixed gain of 10 and 100kHz bandwidth. The LT1990-10
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 LT1990-10 is ideally suited for
both high side and low side current or voltage monitoring.
On a single 5V supply, the LT1990-10 has an adjustable
85V input range, 60dB min CMRR and draws less than
180µA supply current. The rail-to-rail output maximizes
the dynamic range, especially important for single sup-
plies as low as 2.7V.
The LT1990-10 is specified for single 3V, 5V and ±15V
supplies over the industrial temperature range.
The LT1990-10 is available in the 8-pin SO and pin FMEA
compatible MSOP packages.
All registered trademarks and trademarks are the property of their respective owners.
n
n
n
n
n
n
n
n
n
Gain = 10
–3dB Bandwidth = 100kHz
High Common Mode Voltage Range:
n
±250V (V = ±15V)
S
n
85V Window (V = 5V, 0V)
S
Common Mode Rejection Ratio: 60dB Min
Input Protection to ±350V
Gain Error: 0.8% Max
PSRR: 82dB Min
High Input Impedance: 2MΩ Differential,
500kΩ Common Mode
Micropower: 180µA Max Supply Current
Wide Supply Range: 2.7V to 36V
Rail-to-Rail Output
8-pin SO and pin FMEA Compatible MSOP Packages
APPLICATIONS
n
n
n
n
n
n
n
Battery Cell Voltage Monitoring
High Voltage Current Sensing
Signal Acquisition in Noisy Environments
Input Protection
Fault Protected Front Ends
Level Sensing
Isolation
TYPICAL APPLICATION
Full-Bridge Load Current Monitor
+V
SOURCE
5V
LT1990-10
900k
10k
1M
– +
I
L
R
S
V
REF
= 1.5V
IN
OUT
LT6650
GND FB
54.9k
1nF
–
+
100k
V
OUT
1M
10k
40k
40k
900k
100k
–12V
≤
V
CM
≤
73V
V
OUT
= V
REF
± (10 • I
L
• R
S
)
20k
199010 TA01
1µF
Rev 0
For more information
www.analog.com
1
LT1990-10
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Total Supply Voltage (V
+
to V
–
).................................36V
Input Voltage Range
Each Input Continuous......................................±250V
Each Input Transient (0.1s)................................±350V
Differential ........................................................±500V
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4)
LT1990I-10 ......................................... –55°C to 125°C
Specified Temperature Range (Note 5)
LT1990I-10 ...........................................–40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.).................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
–IN
NC
NC
+IN
1
2
3
4
8
7
6
5
REF
V
+
OUT
V
–
REF 1
–IN 2
+IN 3
V
–
4
8
7
6
5
NC
V
+
OUT
NC
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1990IS8-10#PBF
LT1990IMS8-10#PBF
TAPE AND REEL
LT1990IS8-10#TRPBF
LT1990IMS8-10#TRPBF
PART MARKING
199010
LTHBQ
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic MSOP
SPECIFIED TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
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
LT1990-10
3V/5V ELECTRICAL CHARACTERISTICS
half supply, T
A
= 25°C, unless otherwise noted.
Gain
Gain Error
Gain Nonlinearity
Input Voltage Range
V
OUT
= 0.5V to (+V
S
) –0.75V
V
S
= 5V, 0V; V
OUT
= 0.5V to 4.25V
Guaranteed by CMRR
V
S
= 3V, 0V; V
REF
= 1.25V
V
S
= 5V, 0V; V
REF
= 1.25V
V
S
= 5V, 0V; V
REF
= 2.5V
V
S
= 3V, 0V (Note 6)
V
CM
= –5V to 25V, V
REF
= 1.25V
V
S
= 5V, 0V
V
CM
= –5V to 80V, V
REF
= 1.25V
V
S
= 5V, 0V (Note 6)
V
CM
= –38V to 47V, V
REF
= 2.5V
V
OS
e
n
R
IN
PSRR
I
S
V
OL
V
OH
Offset Voltage, RTI
Input Noise Voltage, RTI
Noise Voltage Density, RTI
Input Resistance
Power Supply Rejection Ratio, RTI
Minimum Supply Voltage
Supply Current
Output Voltage Swing LOW
Output Voltage Swing HIGH
f
O
= 0.1Hz to 10Hz
f
O
= 1kHz
Differential
Common Mode
V
S
= 2.7V to 12.7V, V
CM
= V
REF
= 1.25V
Guaranteed by PSRR
(Note 7)
–IN = V
+
, +IN = Half Supply (Note 7)
–IN = 0V, +IN = Half Supply
V
S
= 3V, 0V, Below V
+
V
S
= 5V, 0V, Below V
+
Short to GND (Note 8)
Short to V
+
(Note 8)
V
S
= 5V, 0V, V
OUT
= 0.5V to 4.5V
4V Output Step, V
S
= 5V, 0V
4
13
80
-5
-5
-38
60
60
60
72
72
72
0.8
30
1
2
0.5
92
2.4
160
20
80
100
8
20
100
1
20
1 ± 0.007
2.7
180
50
150
175
3
SYMBOL PARAMETER
G
∆G
GNL
V
CM
CONDITIONS
V
S
= V+, V–; V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 10kΩ, V
CM
= V
REF
=
MIN
TYP
10
0.2
0.01
25
80
47
0.8
%
%
V
V
V
dB
dB
dB
mV
µV
P-P
µV/√Hz
MΩ
MΩ
dB
V
µA
mV
mV
mV
mA
mA
kHz
V/µs
µs
MAX
UNITS
CMRR
Common Mode Rejection Ratio
RTI (Referred to Input)
I
SC
BW
SR
AV
REF
Output Short-Circuit Current
Bandwidth (–3dB)
Slew Rate
Settling Time to 0.01%
Reference Gain to Output
Rev 0
For more information
www.analog.com
3
LT1990-10
The
l
denotes the specifications which apply over the temperature range of
–40°C ≤ T
A
≤ 85°C. V
S
= V+, V–; V
S
= 3V, 0V; V
S
= 5V, 0V; R
L
= 10kΩ, V
CM
= V
REF
= half supply, unless otherwise noted. (Note 4)
SYMBOL PARAMETER
∆G
∆G/∆T
V
CM
Gain Error
Gain vs Temperature
Input Voltage Range
CONDITIONS
V
OUT
= 0.5V to (+V
S
) – 0.75V
(Note 9)
Guaranteed by CMRR
V
S
= 3V, 0V; V
REF
= 1.25V
V
S
= 5V, 0V; V
REF
= 1.25V
V
S
= 5V, 0V; V
REF
= 2.5V
V
S
= 3V, 0V (Note 6)
V
CM
= –5V to 25V, V
REF
= 1.25V
V
S
= 3V, 0V
V
CM
= –5V to 80V, V
REF
= 1.25V
V
S
= 5V, 0V (Note 6)
V
CM
= –38V to 47V, V
REF
= 2.5V
V
OS
∆V
OS
/∆T
V
OSH
PSRR
I
S
V
OL
V
OH
Offset Voltage, RTI
Input Offset Voltage Drift, RTI
Input Offset Voltage Hysteresis, RTI
Power Supply Rejection Ratio, RTI
Minimum Supply Voltage
Supply Current
Output Voltage Swing LOW
Output Voltage Swing HIGH
(Note 9)
(Note 10)
V
S
= 2.7V to 12.7V, V
CM
= V
REF
= 1.25V
Guaranteed by PSRR
(Note 7)
–IN = V
+
, +IN = Half Supply (Note 7)
–IN = 0V, +IN = Half Supply
V
S
= 3V, 0V, Below V
+
V
S
= 5V, 0V, Below V
+
Short to GND (Note 8)
Short to V
+
(Note 8)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
7
MAX
0.95
20
25
80
47
UNITS
%
ppm/°C
V
V
V
dB
dB
dB
–5
–5
–38
57
57
57
CMRR
Common Mode Rejection Ratio
RTI (Referred to Input)
4.5
5
230
76
2.7
250
70
200
225
2
8
22
mV
µV/°C
µV
dB
V
µA
mV
mV
mV
mA
mA
I
SC
Output Short-Circuit Current
Rev 0
4
For more information
www.analog.com
LT1990-10
±15V ELECTRICAL CHARACTERISTICS
otherwise noted.
Gain
Gain Error
Gain Nonlinearity
Input Voltage Range
Common Mode Rejection Ratio, RTI
Offset Voltage, RTI
Input Noise Voltage, RTI
e
n
R
IN
PSRR
I
S
V
OUT
I
SC
BW
SR
AV
REF
Noise Voltage Density, RTI
Input Resistance
Power Supply Rejection Ratio, RTI
Minimum Supply Voltage
Supply Current
Output Voltage Swing
Output Short-Circuit Current
Bandwidth (–3dB)
Slew Rate
Settling Time to 0.01%
Reference Gain to Output
V
OUT
= ±10V, No R
L
10V Output Step
0.8
Short to V
-
Short to V
+
±14.5
6
15
f
O
= 0.1Hz to 10Hz
f
O
= 1kHz
Differential
Common Mode
V
S
= ±1.35V to ±18V, V
CM
= V
REF
= 1.25V
Guaranteed by PSRR
82
V
OUT
= ±10V
V
OUT
= ±10V
Guaranteed by CMRR
V
CM
= –250V to 250V
-250
60
72
0.9
30
1
2
0.5
100
±1.2
200
±14.75
9
22
110
1.2
25
1 ± 0.007
±1.35
275
5.2
SYMBOL PARAMETER
G
∆G
GNL
V
CM
CMRR
V
OS
CONDITIONS
V
S
= ±15V, R
L
= 10kΩ, V
CM
= V
REF
= 0V, T
A
= 25°C, unless
MIN
TYP
10
0.2
0.005
0.8
0.02
250
%
%
V
dB
mV
µV
P-P
µV/√Hz
MΩ
MΩ
dB
V
µA
V
mA
mA
kHz
V/µs
µs
MAX
UNITS
Rev 0
For more information
www.analog.com
5
Microchip MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
