WM2632
Octal 8-bit, Serial Input, Voltage Output DAC
with Internal Reference
Production Data, April 2001, Rev 1.1
FEATURES
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Eight 8-bit DACs in one package
Dual supply 2.7V to 5.5V operation
DNL
±0.1
LSBs, INL
±0.3
LSBs typical
Programmable settling time / power
(1.0µs typical in fast mode)
Internal programmable voltage reference
Microcontroller compatible serial interface
Power down mode ( < 0.1µA)
Monotonic over temperature
Data output for daisy chaining
DESCRIPTION
The WM2632 is an octal, 8-bit, resistor string digital-to-
analogue converter. The eight individual DACs contained in
the IC can be switched in pairs between fast and slow (low
power) operation modes, or powered down, under software
control. Alternatively, the whole device can be powered
down, reducing current consumption to less than 0.1µA.
The DAC outputs are buffered by a rail-to-rail amplifier with
a gain of two, which is configurable as Class A (fast mode)
or Class AB (for low-power mode).
The WM2632 has been designed to interface directly to
industry standard microprocessors and DSPs, and can
operate on two separate analogue and digital power
supplies. It is programmed with a 16-bit serial word
comprising 4 address bits and up to 12 DAC or control
register data bits. All eight DACs can be simultaneously
forced to a preset value using a preset input pin.
A daisy-chain data output makes it possible to control
several of Wolfson’s octal DACs from the same interface,
without increasing the number of control lines.
The device is available in a 20-pin TSSOP package.
Commercial temperature (0° to 70°C) and Industrial
temperature (-40° to 85°C) variants are supported.
APPLICATIONS
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Battery powered test instruments
Digital offset and gain adjustment
Battery operated / remote industrial controls
Programmable loop controllers
CNC machine tools
Machine and motion control devices
Wireless telephone and communication systems
Robotics
ORDERING INFORMATION
DEVICE
WM2632CDT
WM2632IDT
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
20-pin TSSOP
20-pin TSSOP
BLOCK DIAGRAM
REF
(16)
AVDD
(11)
DVDD
(20)
TYPICAL PERFORMANCE
0.04
1.024V / 2.048V
SELECTABLE
REFERENCE
0.03
Differential Non-Linearity (LSBs)
0.02
0.01
DAC A
DIN (2)
SCLK (3)
FS (4)
MODE (17)
PREB (5)
DOUT (19)
REF
SERIAL
INTERFACE
AND
CONTROL
LOGIC
LATCH
POWER/SPEED
CONTROL
RESISTOR
STRING
0
(12) OUT A
-0.01
-0.02
-0.03
-0.04
0
32
64
96
128
DIGITAL CODE
160
192
224
256
DACs B, C, D, E, F, G, H
as DAC A
(6-9, 13-15)
OUT B to H
LOADB
(18)
AGND
(10)
DGND
(1)
WOLFSON MICROELECTRONICS LTD
Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
www.wolfsonmicro.com
Production Data
datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2001
Wolfson Microelectronics Ltd
.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
