Datasheet

LT1996
7
1996f
UU
U
PI FU CTIO S
P9 (Pin 1): Noninverting Gain-of-9 input. Connects a 50k
internal resistor to the op amp’s noninverting input.
P27 (Pin 2): Noninverting Gain-of-27 input. Connects a
(50k/3) internal resistor to the op amp’s noninverting input.
P81 (Pin 3): Noninverting Gain-of-81 input. Connects a
(50k/9) internal resistor to the op amp’s noninverting input.
V
EE
(Pin 4): Negative Power Supply. Can be either ground
(in single supply applications), or a negative voltage (in
split supply applications).
REF (Pin 5): Reference Input. Sets the output level when
difference between inputs is zero. Connects a 450k internal
resistor to the op amp’s noninverting input.
OUT (Pin 6): Output. V
OUT
= V
REF
+ 9 • (V
P1
– V
M1
) + 27 •
(V
P3
– V
M3
) + 81 • (V
P9
– V
M9
).
V
CC
(Pin 7): Positive Power Supply. Can be anything from
2.7V to 36V above the V
EE
voltage.
M81 (Pin 8): Inverting Gain-of-81 input. Connects a
(50k/9) internal resistor to the op amp’s inverting input.
M27 (Pin 9): Inverting Gain-of-27 input. Connects a
(50k/3) internal resistor to the op amp’s inverting input.
M9 (Pin 10): Inverting Gain-of-9 input. Connects a 50k
internal resistor to the op amp’s inverting input.
(Difference Amplifier Configuration)
Gain and Phase vs FrequencyGain vs Frequency
Small Signal Transient Response,
Gain = 9
Small Signal Transient Response,
Gain = 27
0.01Hz to 1Hz Voltage Noise
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(Difference Amplifier Configuration)
FREQUENCY (kHz)
GAIN (dB)
1996 G16
V
S
= 5V, 0V
T
A
= 25°C
50
40
30
20
10
0
0.5 10 100 5001
GAIN = 9
GAIN = 27
GAIN = 81
FREQUENCY (kHz)
1
GAIN (dB)
PHASE (deg)
10 100
400
1996 G17
0.1
V
S
= 5V, 0V
T
A
= 25°C
GAIN = 9
PHASE
(RIGHT AXIS)
GAIN
(LEFT AXIS)
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
40
30
20
10
–10
0
V
S
= ±15V
T
A
= 25°C
MEASURED IN G =117
REFERRED TO OP AMP INPUTS
0 102030405060708090100
TIME (s)
OP AMP VOLTAGE NOISE (100nV/DIV)
1996 G21
50mV/DIV
10µs/DIV
1996 G18
50mV/DIV
20µs/DIV
1996 G19
50mV/DIV
50µs/DIV
1996 G20
Small Signal Transient Response,
Gain = 81