WM2629 データシートの表示（PDF） - Wolfson Microelectronics plc

部品番号

コンポーネント説明

メーカー

WM2629

Octal 8-bit, Serial Input, Voltage Output DAC with Power Down

Wolfson Microelectronics plc 

Production Data

WM2629

DAC A TO H CODE REGISTERS

Addresses 0 to 7 are the DAC registers. Bits D11 (MSB) to D4 (LSB) from these registers are

transferred to the respective DAC when the LOADB input (pin 18) is low. Bits D3 to D1 are unused

and must be set to 0. For instantaneous updating, LOADB can be held low permanently.

CONTROL REGISTER 0

Control register 0 (address 8) is used to select functions that apply to the whole IC, such as Power

Down and Data Input Format.

BIT

D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Function

X

X X X X X X PD DO X

X

IM

Default

X

X XXXXX 0

0

0

0

0

Table 5 Control Register 0 Map

BIT

DESCRIPTION

PD

Full device Power Down

DO

DOUT Enable

IM

Input Mode

X

Reserved

Table 6 Control Register 0 Functionality

0

Normal

Disabled

Straight Binary

1

Power Down

Enabled

Two’s Complement

CONTROL REGISTER 1

Control register 1 (address 9) is used to power down individual pairs of DACs and select their settling

time. Powering down a pair of DACs disables their amplifiers and reduces the power consumption of

the device. The settling time in fast mode is typically 1µs. In slow mode, the settling time is typically

3µs and power consumption is reduced.

BIT

D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Function

Default

X

X

X

X PGH PEF PCD PAB

SGH

SEF

SCD

SAB

X

X XX0 0 0 0

0

0

0

0

Table 7 Control Register 1 Map

BIT

DESCRIPTION

PXY

Power Down DACs X and Y

SXY

Speed Setting for DACs X and Y

Table 8 Control Register 1 Functionality

0

Normal

Slow

1

Power Down

Fast

DAC PRESET REGISTER

The Preset register (address 10) makes it possible to update all eight DACs at the same time. The

value stored in this register becomes the digital input to all the DACs when the asynchronous PREB

input (pin 5) is driven low. If no data has previously been written to the preset register, all DACs are

set to zero scale.

TWO-CHANNEL REGISTERS

The two-channel registers (addresses 12 to 15) provide a ‘differential output’ function where writing

data to one DAC will automatically write the complement to the other DAC in the pair. For example,

writing a value of 255 to address 12 will set DAC A to full scale and DAC B to zero scale.

WOLFSON MICROELECTRONICS LTD

PD Rev 1.0 April 2001

11

Share Link: