Datasheet

Typical Operating Characteristics (continued)
(V
CC
= 5V, V
GND
= 0V, V
IN+
= V
IN-
= 0V, Gain = 10V/V, R
OUTA
= R
OUTB
= 1kΩ to V
CC
/2, T
A
= +25°C, unless otherwise noted.)
MAX9939
SPI Programmable-Gain Amplifier
with Input V
OS
Trim and Output Op Amp
5
Maxim Integrated
INPUT V
OS
vs. TEMPERATURE
MAX9939 toc07
TEMPERATURE (°C)
OFFSET (mV)
1109580655035205-10-25
0.5
1.0
1.5
2.0
2.5
3.0
0
-40 125
1ms/div
INPUT V
OS
TRIM RESPONSE
OUTA
10mV/div
MAX9939 toc08
GAIN = 1V/V
DIFFERENTIAL PSRR vs. FREQUENCY
MAX9939 toc09
FREQUENCY (kHz)
PSRR (dB)
1001
-80
-60
-40
-20
0
-100
0.01 10,000100.1 1000
10V/V ≤ GAIN ≤ 157V/V
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
MAX9939 toc10
FREQUENCY (kHz)
DISTORTION (dB)
0.1 10
-100
-80
-60
-40
-20
0
-120
0.01 1001
1V/V ≤ GAIN ≤ 157V/V
GAIN = 1V/V
GAIN = 157V/V
NOISE VOLTAGE DENSITY
MAX9939 toc11
FREQUENCY (Hz)
NOISE DENSITY (nV/√Hz)
100 10,000
1000
100
10,000
10
10 100,0001000
PGA
10V/V ≤ GAIN ≤ 157V/V
NOISE VOLTAGE DENSITY
MAX9939 toc12
FREQUENCY (Hz)
NOISE DENSITY (nV/√Hz)
100 10,000
100
1000
10
10 100,0001000
AMPLIFIER B