MAX1220 Datasheet, PDF (17/47 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 Description (continued)
PIN
MAX1220
MAX1257
MAX1258
NAME
FUNCTION
Reference 1 Input. Reference voltage; leave unconnected to use the
internal reference (2.5V for the MAX1257 or 4.096V for the
26
35
REF1
MAX1220/MAX1258). REF1 is the positive reference in ADC external
differential reference mode. Bypass REF1 to AGND with a 0.1µF capacitor
in external reference mode only. See the ADC/DAC References section.
27–31, 34
35
36
—
—
—
—
—
—
—
—
—
—
1
2, 3, 5, 6
16, 17,
20, 21
29–32
33, 34, 36–47
48
—
AIN0–AIN5 Analog Inputs
REF2/AIN6
CNVST/AIN7
Reference 2 Input/Analog Input 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. REF2 is the negative reference in the
ADC external differential reference mode.
CNVST/AIN15
Active-Low Conversion-Start Input/Analog Input 15. See Table 5 for details
on programming the setup register.
GPIOA0–GPIOA3 General-Purpose I/O A0–A3. GPIOA0–GPIOA3 can sink and source 15mA.
GPIOB0–GPIOB3
General-Purpose I/O B0–B3. GPIOB0–GPIOB3 can sink 4mA and
source 2mA.
GPIOC0–GPIOC3
General-Purpose I/O C0–C3. GPIOC0–GPIOC3 can sink 4mA and
source 2mA.
AIN0–AIN13
REF2/AIN14
Analog Inputs
Reference 2 Input/Analog Input 14. See Table 5 for details on
programming the setup register. REF2 is the negative reference in the ADC
external differential reference mode.
EP
Exposed Paddle. Must be externally connected to AGND. Do not use as a
ground connect.
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