WM2626 Datasheet, PDF (1/11 Pages) Wolfson Microelectronics plc – Low Power Dual 8-bit Serial Input DAC with Internal Reference

WM2626
Low Power Dual 8-bit Serial Input DAC
with Internal Reference
Production Data, Rev. 1.0, April 2001
FEATURES
• 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
APPLICATIONS
• 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
TEMP. RANGE
PACKAGE
WM2626CD
WM2626ID
0° to 70°C
-40° to 85°C
BLOCK DIAGRAM
8-pin SOIC
8-pin SOIC
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 circuitry
through the REF pin. It is buffered and can supply up to 1mA.
Alternatively, an external reference can be used. A high
impedance reference input buffer eliminates the need to keep
the reference source impedance low.
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.
TYPICAL PERFORMANCE
DIN
SCLK
NCS
x1/x2
1.024V
REF
2
REF
X1
VDD GND
X1
WM2626
8
DAC
X2
SERIAL
INTERFACE
AND
CONTROL
LOGIC
8
DAC
X2
POWER-
2
DOWN AND
SPEED
CONTROL
OUTA
OUTB
0.04
0.03
VDD = 5V, Slow Mode, VREF = 2.048V external
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
0
32
64
96
128
160
192
224
256
DIGITAL CODE
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
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.