WM5620L, WM5620
Production Data
Sept. 1996 Rev 2
3 & 5V Quad 8-Bit Voltage Output DAC
with Serial Interface
Description
WM5620L and WM5620 are quad 8-bit digital to analogue
converters (DAC) controlled via a serial interface. Each
DAC's output voltage range isprogrammable for either x1
or x 2 its reference input voltage, allowing near rail to rail
operation for the x 2 output range. Separate high
impedance buffered voltage reference inputs are provided
for each DAC. WM5620L operates on a single supply
voltage of 3 V while WM5620 operates on 5 V.
WM5620/L interfaces to all popular microcontrollers and
microprocessors via a three wire serial interface with CMOS
compatible, schmitt trigger, digital inputs. An 11 bit
command word comprises 2 DAC select bits, an output
range selection bit and 8-bits of data.
Individual or all DAC outputs are changed using WM5620/
L's double buffered DAC registers and the separate LOAD
and LDAC inputs. DAC outputs are updated
simultaneously by writing a complete set of new values
and then pulsing the LDAC input.
The DAC outputs are optimised for single supply
operation and driving ground referenced loads.
An internal power-on-reset function sets the DAC's input
codes to zero at power up.
Ideal in space critical applications WM5620/L is available
in small outline and DIP packages for commercial (0
o
C to
70
o
C) and industrial (-40
o
C to 85
o
C) temperature ranges.
Features
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Four 8-bit voltage output DAC's
Three wire serial interface
Programmable x1 or x 2 output range.
Power-on-reset sets outputs to zero
Buffered voltage reference inputs
Simultaneous DAC output update
14 pin SO or DIP package
Key Specifications
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Single supply operation:
WM5620L : 3 V
WM5620
: 5V
0 to 4 V output (x 2 output range) at 5 V VDD
0 to 2.5 V output (x 2 output range) at 3 V VDD
Low power: 5.1 mW at 3 V, 10 mW at 5 V max.
Guaranteed monotonic output
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Applications
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Programmable d.c. voltage sources
Digitally controlled attenuator/amplifier
Signal synthesis
Mobile communications
Automatic test equipment
Process control
Block Diagram
Ref A
2
14 V
DD
DAC
9
12
x2
Latch
Latch
8
DACA
Ref B
3
DAC
9
Latch
Latch
8
x2
11
DACB
Ref C
4
DAC
9
10
x2
Latch
Latch
8
DACC
Ref D
5
DAC
9
Latch
Latch
8
x2
9
DACD
Clk
Data
Load
7
6
8
13
LDAC
1
GND
Serial Interface
Power-on-Reset
Production Data
data sheets contain
final specifications current on publication
date. Supply of products conforms to
Wolfson Microelectronics standard terms
and conditions
Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
漏 1996 Wolfson Microelectronics
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
email: admin@wolfson.co.uk
www: http://www.wolfson.co.uk
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