WM2625
Low Power Dual 8-bit Serial Input DAC
Production Data, April 2001, Rev. 1.0
FEATURES
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Dual 8-bit voltage output DAC
Single supply from 2.7V to 5.5V
Low supply current
- 0.8mA typical in slow mode
- 1.8mA typical in fast mode
DNL
±0.2
LSB, INL
±0.5
LSB (max)
Monotonic over temperature
DSP compatible serial interface
Programmable settling time of 1µs or 3µs typical
High impedance reference input buffer
DESCRIPTION
The WM2625 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. The WM2625 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 reference voltage input features a high impedance buffer
which eliminates the need to keep the reference source
impedance low.
The WM2625 is available in an 8-pin SOIC package.
Commercial (0° to 70°C) and Industrial (-40° to 85°C)
temperature range variants are available.
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
WM2625CD
WM2625ID
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
8-pin SOIC
8-pin SOIC
BLOCK DIAGRAM
REF
TYPICAL PERFORMANCE
X1
VDD
GND
X1
0.1
VDD = 5V, V
REF
= 2.048V, Speed = Fast Mode, T
A
= 25.5 C
0.08
DNL - Differential Non-Linearity (LSBs)
O
WM2625
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
0
32
64
96
128
DIGITAL CODE
160
192
224
256
8
DAC
X2
OUTA
8
DIN
SCLK
NCS
SERIAL
INTERFACE
AND
CONTROL
LOGIC
2
DAC
X2
OUTB
POWER-
DOWN AND
SPEED
CONTROL
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 ]
