WM2610

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 1.0 February 2001

8

DEVICE DESCRIPTION

GENERAL FUNCTION

The WM2610 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:

Output voltage =

4096

CODE

REF

V

×

INPUT

OUTPUT

1111

1111

1111

4096

4095

×

REF

V

::

1000

0000

0001

4096

2049

×

REF

V

1000

0000

0000

2

4096

2048

REF

V

REF

V

=

×

0111

1111

1111

4096

2047

×

REF

V

::

0000

0000

0001

4096

REF

V

0000

0000

0000

0V

Table 1 Binary Code Table

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

2k

Ω load with a 100pF load capacitance.