16-Bit, Low-Power, 2-Channel,

Sigma-Delta ADC

16

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Pin Description

PIN

NAME

FUNCTION

1

SCLK

Serial Clock Input. Apply an external serial clock to transfer data to and from the device at data rates

of up to 5MHz.

2

CLKIN

Clock Input. Connect a crystal/resonator between CLKIN and CLKOUT, or drive CLKIN externally with

a CMOS-compatible clock source with CLKOUT left unconnected.

3

CLKOUT

Clock Output. Connect a crystal/resonator between CLKIN and CLKOUT. When enabled, CLKOUT

provides a CMOS-compatible, inverted clock output. Set CLKDIS = 0 in the clock register to enable

CLKOUT. Set CLKDIS = 1 in the clock register to disable CLKOUT to conserve power.

4

CS

Active-Low Chip-Select Input. CS selects the active device in systems with more than one device on

the serial bus. Drive CS low to clock data in on DIN and to clock data out on DOUT. When CS is high,

DOUT is high impedance. Connect CS to GND for 3-wire operation.

5

RESET

Active-Low Reset Input. Drive RESET low to reset the MX7705 to power-on reset status.

6

AIN2+

Channel 2 Positive Differential Analog Input

7

AIN1+

Channel 1 Positive Differential Analog Input

8

AIN1-

Channel 1 Negative Differential Analog Input

9

REF+

Positive Differential Reference Input

10

REF-

Negative Differential Reference Input

11

AIN2-

Channel 2 Negative Differential Analog Input

12

DRDY

Active-Low Data-Ready Output. DRDY goes low when a new conversion result is available in the data

register. When a read-operation of a full output word completes, DRDY returns high.

13

DOUT

Serial Data Output. DOUT outputs serial data from the data register. DOUT changes on the falling

edge of SCLK and is valid on the rising edge of SCLK. When CS is high, DOUT is high impedance.

14

DIN

Serial Data Input. Data on DIN is clocked in on the rising edge of SCLK when CS is low.

15

Power Input

16

GND

Ground