WM2626
Low Power Dual 8-bit Serial Input DAC
with Internal Reference
Production Data, Rev. 1.0, April 2001
FEATURES
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Dual 8-bit voltage output DAC
Single supply from 2.7V to 5.5V
Low power consumption:
- 1.7mW typical (3V supply, slow mode)
- 3.7mW typical (3V supply, fast mode)
DNL
±0.1
LSB, INL
±0.4
LSB (typical)
Monotonic over temperature
Microprocessor and DSP compatible serial interface
Programmable settling time of 0.8µs or 2.8µs typical
High impedance reference input buffer
DESCRIPTION
The WM2626 is a dual 8-bit voltage output, resistor string
digital-to-analogue converter. It can operate with supply
voltages between 2.7V and 5.5V and can be powered down
under software control. Power down reduces current
consumption to 1µA.
The device has been designed for glueless interface to industry
standard microprocessors and DSPs. It is programmed with a
16-bit serial word including 4 control bits and 8 data bits.
Excellent performance is delivered with a typical DNL of
0.2LSBs. Monotonicity is guaranteed over the operating
temperature range. The settling time of the DAC is
programmable to allow for optimisation of speed versus power
dissipation. The analogue output is buffered by a rail-to-rail
amplifier with a gain of two and a Class AB output stage.
The on-chip voltage reference is available to external
through the REF pin. It is buffered and can supply up
Alternatively, an external reference can be used.
impedance reference input buffer eliminates the need
the reference source impedance low.
circuitry
to 1mA.
A high
to keep
APPLICATIONS
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Digital servo control loops
Industrial process control
Battery powered instruments and controls
Machine and motion control devices
Digital offset and gain adjustment
ORDERING INFORMATION
DEVICE
WM2626CD
WM2626ID
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
8-pin SOIC
8-pin SOIC
The WM2626 is available in an 8-pin SOIC package.
Commercial (0° to 70°C) and Industrial (-40° to 85°C)
temperature range variants are available.
BLOCK DIAGRAM
REF
VDD
GND
TYPICAL PERFORMANCE
0.04
X1
VDD = 5V, Slow Mode, V
REF
= 2.048V external
0.03
x1/x2
X1
Differential Non-Linearity (LSBs)
WM2626
0.02
1.024V
REF
8
2
DAC
0.01
X2
OUTA
0
8
DIN
SCLK
NCS
SERIAL
INTERFACE
AND
CONTROL
LOGIC
2
DAC
X2
OUTB
-0.01
-0.02
POWER-
DOWN AND
SPEED
CONTROL
-0.03
-0.04
0
32
64
96
128
DIGITAL CODE
160
192
224
256
WOLFSON MICROELECTRONICS LTD
Lutton Court, 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 ]
