MAX1021 datasheet(17/47 Pages) MAXIM

17 / 47 page

10-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

______________________________________________________________________________________

Pin Description (continued)

MAX1020/

MAX1021

MAX1022/

MAX1023

MAX1057/

MAX1058

NAME

FUNCTION

REF1

Reference 1 Input. Reference voltage; leave unconnected to use the

internal reference (2.5V for the MAX1021/MAX1023/MAX1057 or 4.096V

for the MAX1020/MAX1022/MAX1058). 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

——

AIN0–AIN5

Analog Inputs

—

REF2/AIN6

Reference 2 Input/Analog-Input Channel 6. See Table 5 for details on

programming the setup register. REF2 is the negative reference in the

ADC external differential reference.

—

CNVST/AIN7

Active-Low Conversion-Start Input/Analog Input 7. See Table 5 for details

on programming the setup register.

—1

—

CNVST/AIN11

Active-Low Conversion-Start Input/Analog Input 11. See Table 5 for

details on programming the setup register.

—

23, 25,

27–31,

33, 34, 35

—

AIN0–AIN9

Analog Inputs

—36—

REF2/AIN10

Reference 2 Input/Analog-Input Channel 10. See Table 5 for details on

programming the setup register. REF2 is the negative reference in the

ADC external differential reference.

——

CNVST/AIN15

Active-Low Conversion-Start Input/Analog Input 15. See Table 5 for

details on programming the setup register.

——

2, 3, 5, 6

GPIOA0–GPIOA3 General-Purpose I/O A0–A3. GPIOA0–GPIOA3 can sink and source 15mA.

——

16, 17,

20, 21

GPIOB0–GPIOB3

General-Purpose I/O B0–B3. GPIOB0–GPIOB3 can sink 4mA and

source 2mA.

——

29–32

GPIOC0–GPIOC3

General-Purpose I/O C0–C3. GPIOC0–GPIOC3 can sink 4mA and

source 2mA.

——

33, 34,

36–47

AIN0–AIN13

Analog Inputs

——

REF2/AIN14

Reference 2 Input/Analog-Input Channel 14. See Table 5 for details on

programming the setup register. REF2 is the negative reference in the

ADC external differential reference.

——

—

Exposed Paddle. Must be externally connected to AGND. Do not use as

a ground connect.

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