Wolfson Microelectronics

7

WM5615

Pin Description

PIN

NAME

FUNCTION

1

DIN

Serial data input.

2

SCLK

Serial clock input.

3

CS

Chip select, active low.

4

DOUT

Serial data output for daisy-

chaining.

5

AGND

Analogue ground.

6

REFIN

Reference input.

7

VOUT

DAC output.

8

VDD

Positive power supply.

Timing Diagram

Detailed Description

General Function

The WM5615 uses a resistor string network buffered

with a single-supply CMOS op amp in a fixed gain of x2 to

convert 10-bit digital data to analogue voltage levels (see

Block Diagram). The topology of the WM5615 makes the

output the same polarity as the reference input (see Ta-

ble 1).

An internal reset circuit forces the DAC register to reset

to all 0s on power-up.

VOUT

R

+

VDD

AGND

0.1µF

DOUT

DIN

SCLK

-

R

+5V

CS

REFIN

Figure 1 - Typical Operating Circuit

DIN

DOUT

SCLK

CS

Previous LSB

NOTES: A. The input clock, applied at the SCLK terminal, should be inhibited low when CS is high to minimise clock feedthrough.

B. Data input from preceeding conversion cycle.

C. Sixteenth SCLK falling edge.

See note A

See note C

See note B

+

-