MAX1221 Datasheet, PDF (17/44 Pages) Maxim Integrated Products – 12-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
PIN
MAX1221 MAX1223 MAX1343
23, 25,
—
27–31,
—
33, 34, 35
26
26
26
27–31, 34
—
27–31, 34
35
—
35
36
—
36
—
36
—
—
—
—
NAME
AIN0–AIN9
REF1
AIN0–AIN5
REF2/AIN6
CNVST/AIN7
REF2/AIN10
EP
Pin Description (continued)
FUNCTION
Analog Inputs
Reference 1 Input. Reference voltage; leave unconnected to use the
internal reference (2.5V). REF1 is the positive reference in ADC differential
mode. Bypass REF1 to AGND with a 0.1µF capacitor in external reference
mode only. See the ADC/DAC References section.
Analog Inputs
Reference 2 Input/Analog Input Channel 6. See Table 5 for details on
programming the setup register.
Active-Low Conversion-Start Input/Analog Input 7. See Table 5 for details
on programming the setup register.
Reference 2 Input/Analog Input Channel 10. See Table 5 for details on
programming the setup register.
Exposed Pad. Must be externally connected to AGND. Do not use as a
ground connect.
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