WM5620L Datasheet, PDF (1/14 Pages) Wolfson Microelectronics plc – 3 & 5V Quad 8-Bit Voltage Output DAC with Serial Interface

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^oC to
70^oC) and industrial (-40^oC to 85^oC) temperature ranges.
Features
• 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
• Single supply operation:
WM5620L : 3 V
WM5620 : 5 V
• 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
Applications
• Programmable d.c. voltage sources
• Digitally controlled attenuator/amplifier
• Signal synthesis
• Mobile communications
• Automatic test equipment
• Process control
Block Diagram
2
Ref A
Ref B ³
4
Ref C
Ref D ⁵
Clk ⁷
Data ⁶
Load ⁸
9
Latch
9
Latch
9 _Latch
9 _Latch
14 ^VDD
DAC
x2
Latch ⁸
DAC
x2
Latch ⁸
DAC
x2
Latch ⁸
DAC
x2
Latch ⁸
12
DACA
11
DACB
10
DACC
9
DACD
Serial Interface
13 LDAC
Power-on-Reset
1 GND
Production Data data sheets contain
final specifications current on publication
date. Supply of products conforms to
Wolfson Microelectronics standard terms
and conditions
Wolfson Microelectronics ^{© 1996 Wolfson Microelectronics}
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
Tel: [phone] Fax: [phone]
email: [e-mail]
www: http://www.wolfson.co.uk