WM2608
Octal 10-bit, Serial Input, Voltage Output DAC
with Power Down
Production Data, April 2001, Rev 1.0
FEATURES
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Eight 10-bit DACs in one package
Dual supply 2.7V to 5.5V operation
DNL
±0.1
LSBs, INL
±0.5
LSBs typical
Programmable settling time / power
(1.0µs typical in fast mode)
Microcontroller compatible serial interface
Power down mode ( < 0.1µA)
Monotonic over temperature
Data output for daisy chaining
DESCRIPTION
The WM2608 is an octal, 10-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 WM2608 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
WM2608CDT
WM2608IDT
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
0.2
0.15
Differential Non-Linearity (LSBs)
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
128
256
384
512
DIGITAL CODE
640
768
896
1024
DAC A
DIN (2)
SCLK (3)
FS (4)
MODE (17)
PREB (5)
DOUT (19)
VREF/2
SERIAL
INTERFACE
AND
CONTROL
LOGIC
LATCH
POWER/SPEED
CONTROL
RESISTOR
STRING
(12) OUT A
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 ]
