WM2630 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM2630

Octal 12-bit, Serial Input, Voltage Output DAC with Internal Reference

Wolfson Microelectronics plc 

WM2630

DEVICE DESCRIPTION

Production Data

GENERAL FUNCTION

The WM2630 is an octal 12-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 12-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

4096

INPUT

OUTPUT

1111

1111

1111

( ) 4095

2 VREF

4096

:

:

1000

0000

0001

( ) 2049

2 VREF

4096

1000

0000

0000

( ) 2048

2 VREF

= VREF

4096

0111

1111

1111

( ) 2047

2 VREF

4096

:

:

0000

0000

0001

( )1

2 VREF

4096

0000

0000

0000

0V

Table 1 Binary Code Table (0V to 2VREF Output), Gain = 2

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.

PROGRAMMABLE REFERENCE

The DAC reference can be sourced internally or externally under software control. If an external reference

voltage is applied to the REF pin, the device must be configured to accept this. If an internal reference is

selected, a voltage of 1.024V or 2.048 is available. The internal reference can source up to 1mA and can

therefore be used as an external system reference.

WOLFSON MICROELECTRONICS LTD

PD Rev 1.1 February 2001

8

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