AD9957SLASHPCBZ datasheet(12/62 Pages) AD

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Data Sheet

AD9957

Rev. E | Page 11 of 61

Pin No.

Mnemonic

I/O1

Description

I/O_UPDATE

I/O

Input/Output Update; Digital Input Or Output (Active High), Depending on the Internal

I/O Update Active Bit. A high on this pin indicates a transfer of the contents of the I/O

buffers to the corresponding internal registers.

OSK

Output Shift Keying, Digital Input (Active High). When using OSK (manual or automatic),

this pin controls the OSK function. See the Output Shift Keying (OSK) section of the data

sheet for details. When not using OSK, tie this pin high.

SDIO

I/O

Serial Data Input/Output, Digital Input/Output (Active High). This pin can be either

unidirectional or bidirectional (default), depending on configuration settings. In

bidirectional serial port mode, this pin acts as the serial data input and output. In

unidirectional, it is an input only.

SDO

Serial Data Output, Digital Output (Active High). This pin is only active in unidirectional

serial data mode. In this mode, it functions as the output. In bidirectional mode, this pin is

not operational and must be left floating.

SCLK

Serial Data Clock. Digital clock (rising edge on write, falling edge on read). This pin

provides the serial data clock for the control data path. Write operations to the AD9957

use the rising edge. Readback operations from the AD9957 use the falling edge.

Chip Select, Digital Input (Active Low). Bringing this pin low enables the AD9957 to detect

serial clock rising/falling edges. Bringing this pin high causes the AD9957 to ignore input

on the serial data pins.

I/O_RESET

Input/Output Reset. Digital input (active high). This pin can be used when a serial I/O

communication cycle fails (see the I/O_RESET—Input/Output Reset section for details).

When not used, connect this pin to ground.

IOUT

Open-Source DAC Complementary Output Source. Analog output, current mode. Connect

through 50 Ω to AGND.

IOUT

Open-Source DAC Output Source. Analog output, current mode. Connect through 50 Ω to

AGND.

DAC_RSET

Analog Reference Pin. This pin programs the DAC output full-scale reference current.

Attach a 10 kΩ resistor to AGND.

REF_CLK

Reference Clock Input. Analog input. See the REFCLK Overview section for more details.

REF_CLK

Complementary Reference Clock Input. Analog input. See the REFCLK Overview section

for more details.

REFCLK_OUT

Reference Clock Output. Analog output. See the REFCLK Overview section for more details.

XTAL_SEL

Crystal Select (1.8 V Logic). Analog input (active high). Driving the XTAL_SEL pin high enables

the internal oscillator to be used with a crystal resonator. If unused, connect it to AGND.

(EPAD)

Exposed Pad

(EPAD)

The EPAD should be soldered to ground.

I is input, O is output.

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