Datasheet

MAX9939
SPI Programmable-Gain Amplifier
with Input V
OS
Trim and Output Op Amp
11
Maxim Integrated
R
I
A
V
CC
V
CC
/2
20kΩ
20kΩ
V
CC
V
CC
/2
220pF
20kΩ
20kΩ
LVL
V
CC
V
CC
/2
20kΩ
20kΩ
10kΩ
10kΩ
10kΩ
INA+
INA-
66.5kΩ
66.5kΩ
100nF
4.7nF
B
121kΩ
1.21kΩ
ADC
R
F
OUTA
INB
OUTB
ASIC
CS
DOUT
SCLK
SCLK
SPI REGISTERS
GND
DIN CS
0.1µF
1µF
V
CC
GAIN SHUTDOWN
INPUT
OFFSET-
VOLTAGE
TRIM
MAX9939
Figure 3. Using the MAX9939 Output Amplifier as an Anti-Aliasing Filter (Corner Frequency = 1.3kHz) to Maximize Nyquist Bandwidth