WM5621L Datasheet, PDF (1/14 Pages) Wolfson Microelectronics plc – Low-power Quadruple 8-Bit DAC

Low-power Quadruple 8-Bit DAC
WM5621L
Production Data
Jan. 1997 Rev. 1.0
Description
WM5621L is a quadruple 8-bit digital to analogue converter
(DAC) with buffered reference inputs (high impedance). The
DAC produces an output voltage that ranges between
either one or two times the reference voltage and GND. The
DAC is monotonic. The device operates from a single
supply in the range 2.7V to 5.5V. A power-on reset function
is incorporated to provide repeatable start-up conditions. A
global hardware shut-down terminal and the capacity to
shut-down each individual DAC with software are provided
to minimize power consumption.
WM5621L interfaces to all popular microcontrollers and
microprocessors via a three wire serial interface with CMOS
compatible, schmitt trigger, digital inputs. Alternatively a two
wire serial interface can be activated. An 11-bit command
word consists of eight bits of data, two DAC select bits and
a range bit for selection between the times one or times two
output range. The DACregisters are double buffered which
allows a complete set of new values to be written to the
device, and then under control of HWACT, all of the DAC
outputs are simultaneously updated.
Ideal in space critical applications WM5621L is available
in small outline and DIP packages and is characterized for
operation from -25^oC to 85^oC.
Block Diagram
Features
• Individual (or all) DAC's can be powered-down
• One low-power 8-bit voltage output DAC
• Three 8-bit voltage output DACs
• Fast serial interface (1 MHz max)
• Simple 2 or 3 wire interface
• Programmable for 1 or 2 times output range
• High impedance reference inputs for each DAC
• Simultaneous update facility
• Extended temperature range (-25^oC to 85^oC)
• Single supply operation, range 2.7 V to 5.5 V
• 0 to 4 V output (x2 output range) at 5 V VDD
• 0 to 2.5 V output (x2 output range) at 3 V VDD
• Low power specification:
All DACs on
: 3.6 mW at 3.6 V typ
: 6 mW at 5 V typ
Low power DAC
: 0.54 mW at 3.6V typ
All DAC's shutdown
: 0.18 mW at 3.6V typ
• Guaranteed monotonic output
Applications
• Mobile Communications
• Programmable d.c. voltage sources
• Digitally controlled attenuator/amplifier
• Signal synthesis
• Automatic test equipment
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
Tel: [phone] Fax: [phone]
email: [e-mail]
www: http://www.wolfson.co.uk
© 1996 Wolfson Microelectronics