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PDF LT1990 Data sheet ( Hoja de datos )
| Número de pieza | LT1990 | |
| Descripción | Difference Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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: 2MΩ Differential,
500kΩ Common 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
1 page  
LT1990
3V/5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range of –40°C ≤ TA ≤ 85°C. VS = 3V, 0V; VS = 5V, 0V;
RL = 10k, VCM = VREF = half supply, G = 1, 10, unless otherwise noted. (Notes 4, 6)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Minimum Supply Voltage
Guaranteed by PSRR
● 2.7
IS Supply Current
VOL Output Voltage Swing LOW
VOH Output Voltage Swing HIGH
ISC Output Short-Circuit Current
(Note 8)
–IN = V+, +IN = Half Supply (Note 8)
–IN = 0V, +IN = Half Supply
VS = 3V, 0V, Below V+
VS = 5V, 0V, Below V+
Short to GND (Note 9)
Short to V+ (Note 9)
●
●
●
●
●2
●8
170
70
200
225
UNITS
V
µA
mV
mV
mV
mA
mA
±15V ELECTRICAL CHARACTERISTICS
VS = ±15V, RL = 10k, VCM = VREF = 0V, G = 1, 10, TA = 25°C, unless otherwise noted. (Note 6)
SYMBOL PARAMETER
CONDITIONS
G Gain
∆G Gain Error
Pins 5 and 8 = Open
Pins 5 and 8 = VREF
VOUT = ±10V
LT1990, G = 1
LT1990A, G = 1
G = 10
GNL Gain Nonlinearity
VOUT = ±10V
G=1
G = 10
VCM
CMRR
Input Voltage Range
Common Mode Rejection Ratio, RTI
Guaranteed by CMRR
VCM = –250V to 250V
LT1990
LT1990A
VOS Offset Voltage, RTI
en Input Noise Voltage, RTI
Noise Voltage Density, RTI
RIN Input Resistance
G = 1, 10
fO = 0.1Hz to 10Hz
fO = 1kHz
Differential
Common Mode
PSRR
Power Supply Rejection Ratio, RTI
Minimum Supply Voltage
VS = ±1.35V to ±18V
Guaranteed by PSRR
IS Supply Current
VOUT Output Voltage Swing
ISC Output Short-Circuit Current
Short to V–
Short to V+
BW Bandwidth
G=1
G = 10
SR Slew Rate
Settling Time to 0.01%
G = 1, VOUT = ±10V
10V Step, G = 1
AVREF
Reference Gain to Output
MIN TYP MAX UNITS
1
10
0.4 0.6
0.07 0.28
0.2 0.8
%
%
%
0.0008 0.002
0.005 0.02
–250 250
%
%
V
60 68
70 75
0.9 5.2
22
1
2
0.5
82 100
±1.2 ±1.35
140 180
±14.5 ±14.79
69
15 22
105
7
0.3 0.55
60
1 ± 0.0007
dB
dB
mV
µVP-P
µV/√Hz
MΩ
MΩ
dB
V
µA
V
mA
mA
kHz
kHz
V/µs
µs
1990f
5
5 Page 
TYPICAL PERFOR A CE CHARACTERISTICS
Small Signal Transient Response
Small Signal Transient Response
LT1990
Large Signal Transient Response
1.5V GND
GND
VS = 3V, 0V
G = 1, –1
RL = 10k
VREF = 1.5V
50µs/DIV
1990 G28
VS = ±15V
G = 1, –1
RL = 10k
VREF = GND
50µs/DIV
1990 G29
VS = ±15V
G = 1, –1
RL = 10k
VREF = GND
50µs/DIV
1990 G30
BLOCK DIAGRA
V+ 7
–IN 2
+IN 3
R1
1M
R2
1M
V– 4
R5
900k
–
+
R3
40k
R4
40k
R8
900k
1
REF
R7
10k
R6
100k
8 GAIN1
6 OUT
R10
10k
R9
100k
5 GAIN2
1990 SS
PI FU CTIO S
REF (Pin 1): Reference Input. Sets the output level when
the difference between the inputs is zero.
–IN (Pin 2): Inverting Input. Connects a 1MΩ resistor to
the op amp’s inverting input. Designed to permit high
voltage operation.
+IN (Pin 3): Noninverting Input. Connects a 1MΩ resistor
to the op amp’s noninverting input. Designed to permit
high voltage operation.
V– (Pin 4): Negative Power Supply. Can be either ground
(in single supply applications) or a negative voltage (in
split supply applications).
GAIN2 (Pin 5): Gain = 10 Select Input. Configures the
amplifier for a gain of 10 when connected to the GAIN1 pin.
The gain is equal to one when both GAIN2 and GAIN1 are
open. See Applications section for additional functions.
OUT (Pin 6): Output. VOUT = G • (V+IN – V–IN) + VREF, in the
basic configuration.
V+ (Pin 7): Positive Power Supply. Can range from 2.7V to
36V above the V– voltage.
GAIN1 (Pin 8): Gain = 10 Select Input. Configures the
amplifier for a gain of 10 when connected to the GAIN2 pin.
The gain is equal to one when both GAIN1 and GAIN2 are
open. See Applications section for additional functions.
1990f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1990.PDF ] | |
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