WM2630
Octal 12-bit, Serial Input, Voltage Output DAC
with Internal Reference
Production Data, February 2001, Rev 1.1
FEATURES
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Eight 12-bit DACs in one package
Dual supply 2.7V to 5.5V operation
DNL
±0.5
LSBs, INL
±2.0
LSBs typ.
Programmable settling time / power
(1.0µs typ. 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 WM2630 is an octal, 12-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 WM2630 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
WM2630CDT
WM2630IDT
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
1.024V / 2.048V
SELECTABLE
REFERENCE
1
0.75
DIN (2)
SCLK (3)
FS (4)
MODE (17)
PREB (5)
DOUT (19)
SERIAL
INTERFACE
AND
CONTROL
LOGIC
LATCH
Differential Non-Linearity (LSBs)
DAC A
RESISTOR
STRING
0.5
0.25
(12) OUT A
0
POWER/SPEED
CONTROL
REF
-0.25
-0.5
DACs B, C, D, E, F, G, H
as DAC A
(6-9, 13-15)
OUT B to H
-0.75
-1
0
512
1024
1536
2048
DIGITAL CODE
2560
3072
3584
4096
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.co.uk
Production Data
datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
©2001
Wolfson Microelectronics Ltd
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
