WM2629CDT データシートの表示（PDF） - Wolfson Microelectronics plc

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WM2629CDT

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

Wolfson Microelectronics plc 

WM2629

DEVICE DESCRIPTION

Production Data

GENERAL FUNCTION

The WM2629 is an octal 8-bit, voltage output DAC. It contains a serial interface, control logic for

speed and power down, a programmable voltage reference, and eight digital to analogue converters.

Each converter uses a resistor string network buffered with an op amp to convert 8-bit digital data to

analogue voltage levels (see Block Diagram). The output voltage is determined by the reference

input voltage and the input code according to the following relationship:

( ) CODE

Output voltage = 2 VREF

256

INPUT

1111

1111

:

1000

0001

1000

0000

0111

1111

:

0000

0001

0000

0000

Table 1 Binary Code Table

OUTPUT

( ) 255

2 VREF

256

:

( ) 129

2 VREF

256

( ) 128

2 VREF

= VREF

256

( ) 127

2 VREF

256

:

( )1

2 VREF

256

0V

POWER ON RESET

An internal power-on-reset circuit resets the DAC register to all 0s on power-up.

BUFFER AMPLIFIER

The output buffer has a near rail-to-rail output with short circuit protection and can reliably drive a

2kΩ load with a 100pF load capacitance.

WOLFSON MICROELECTRONICS LTD

PD Rev 1.0 April 2001

8

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