AD5426 查看數據表（PDF） - Analog Devices

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AD5426

8-/10-/12-Bit High Bandwidth Multiplying DACs with Serial Interface

Analog Devices 

AD5426/AD5432/AD5443

PIN CONFIGURATION

IOUT1 1

IOUT2 2

GND 3

SCLK 4

SDIN 5

AD5426/

AD5432/

AD5443

(Not to Scale)

10 RFB

9 VREF

8 VDD

7 SDO

6 SYNC

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Function

1

IOUT1

DAC Current Output.

2

IOUT2

DAC Analog Ground. This pin should normally be tied to the analog ground of the system.

3

GND

Ground Pin.

4

SCLK

Serial Clock Input. By default, data is clocked into the input shift register on the falling edge of the serial

clock input. Alternatively, by means of the serial control bits, the device may be configured such that data is

clocked into the shift register on the rising edge of SCLK.

5

SDIN

Serial Data Input. Data is clocked into the 16-bit input register on the active edge of the serial clock input.

By default, on power-up, data is clocked into the shift register on the falling edge of SCLK. The control bits

allow the user to change the active edge to rising edge.

6

SYNC

Active Low Control Input. This is the frame synchronization signal for the input data. When SYNC goes

low, it powers on the SCLK and DIN buffers, and the input shift register is enabled. Data is loaded to the

shift register on the active edge of the following clocks (power-on default is falling clock edge). In standalone

mode, the serial interface counts clocks and data is latched to the shift register on the 16th active clock edge.

7

SDO

Serial Data Output. This allows a number of parts to be daisy-chained. By default, data is clocked into the

shift register on the falling edge and out via SDO on the rising edge of SCLK. Data will always be clocked

out on the alternate edge to loading data to the shift register. Writing the Readback control word to the

shift register makes the DAC register contents available for readback on the SDO pin, clocked out on the

opposite edges to the active clock edge.

8

VDD

9

VREF

10

RFB

Positive Power Supply Input. These parts can be operated from a supply of 3 V to 5.5 V.

DAC Reference Voltage Input.

DAC Feedback Resistor pin. Establish voltage output for the DAC by connecting to external amplifier output.

–6–

REV. 0

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