AD5381

Data Sheet

Rev. D | Page 16 of 40

Mnemonic

Function

PD

Power-Down (Level Sensitive, Active High). PD is used to place the device in low power mode, where the analog

current consumption is reduced to 2 µA and the digital current consumption is reduced to 20 µA. In power-down

mode, all internal analog circuitry is placed in low power mode, and the analog output is configured as a high

impedance output or provides a 100 kΩ load to ground, depending on how the power-down mode is configured.

The serial interface remains active during power-down.

FIFO EN

FIFO Enable (Level Sensitive, Active High). When connected to DVDD, the internal FIFO is enabled, allowing the user

to write to the device at full speed. FIFO is only available in parallel interface mode. The status of the FIFO EN pin is

sampled on power-up, and also followinga CLEAR or RESET, to determine if the FIFO is enabled. In either serial or

DB9/(SPI/I

Multifunction Input Pin. In parallel interface mode, this pin acts as DB9 of the parallel input data-word. In serial

interface mode, this pin acts as serial interface mode select. When serial interface mode is selected (SER/PAR = 1) and

this input is low, SPI mode is selected. In SPI mode, DB12 is the serial clock (SCLK) input and DB11 is the serial data

(DIN) input.

When serial interface mode is selected (SER/PAR = 1) and this input is high I

In this mode, DB12 is the serial clock (SCL) input and DB11 is the serial data (SDA) input.

DB10/(SCLK/SCL)

Multifunction Input Pin. In parallel interface mode, this pin acts as DB10 of the parallel input data-word. In serial

interface mode, this pin acts as a serial clock input.

Serial Interface Mode. In serial interface mode, data is clocked into the shift register on the fallingedge of SCLK.

This operates at clock speeds up to 50 MHz.

DB11/(DIN/SDA)

Multifunction Data Input Pin. In parallel interface mode, this pin acts as DB11 of the parallel input data-word.

Serial Interface Mode. In serial interface mode, this pin acts as the serial data input. Data must be valid on the falling

edge of SCLK.