AD9508BCPZ datasheet(13/40 Pages) AD

13 / 40 page

Data Sheet

AD9508

Rev. G | Page 13 of 40

Pin No.

Mnemonic

Description

RESET

CMOS Input. Device Reset. When this active low pin is asserted, the internal register settings enter their

default state after the RESET is released. Note that RESET also serves as a power-down of the device

while an active low signal is applied to the pin. The RESET pin has an internal 24 kΩ pull-up resistor.

SCLK/SCL/S0

Serial Programming Clock/Data Clock/Programming Pin. Multipurpose pin controlled by the PROG_SEL

pin used for serial programming clock (SCLK) in SPI mode or data clock (SCL) for serial programming in

I2C Mode. The PROG_SEL pin determines which programming mode is used. In pin programming

mode, this pin becomes S0. In this mode, S0 is hardwired with a resistor to either VDD or ground. The

resistor value and resistor biasing determine the output divider values for the outputs on Pin 2 and Pin

3. See the Pin Strapping to Program on Power-Up section for more details.

SYNC

Clock Synchronization. When this pin is active low, the output drivers are held static and then

synchronized on a low-to-high transition of this pin. The SYNC pin has an internal 24 kΩ pull-up resistor.

CLK

Differential Clock Input or Single-Ended CMOS Input. Whether this pin serves as the differential clock

input or the single-ended CMOS input depends on the logic state of the IN_SEL pin.

CLK

Complementary Differential Clock Input.

IN_SEL

CMOS Input. A logic high configures the CLK and CLK inputs for a differential input signal. A logic low

configures the input for single-ended CMOS applied to the CLK pin. AC-couple the unused CLK to

ground with a 0.1 µF capacitor.

SDIO/SDA/S1

Serial Data Input and Output (SPI)/Serial Data (I2C)/Pin Programming. Pin 24 is a multipurpose input

controlled by the PROG_SEL pin used for SPI (SDIO), I2C (SDA), and pin strapping modes (S1). When the

device is in 4-wire SPI mode, data is written via SDIO. In 3-wire mode, both data reads and writes occur

on this pin. There is no internal pull-up/pull-down resistor on this pin. In I2C mode, SDA serves as the

serial data pin. The PROG_SEL pin determines which programming mode is used. In pin programming

mode, this pin becomes S1. In this mode, S1 is hardwired with a resistor to either VDD or ground. The

resistor value and resistor biasing determine the output divider values for the outputs on Pin 7 and

Pin 8. See the Pin Strapping to Program on Power-Up section for more details.

Exposed Pad. The exposed die pad must be connected to ground (VSS).

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