WM2625 Datasheet, PDF (1/9 Pages) Wolfson Microelectronics plc – Low Power Dual 8-bit Serial Input DAC

WM2625
Low Power Dual 8-bit Serial Input DAC
Production Data, April 2001, Rev. 1.0
FEATURES
• 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
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
WM2625CD
WM2625ID
0° to 70°C
-40° to 85°C
BLOCK DIAGRAM
8-pin SOIC
8-pin SOIC
VDD
GND
REF
X1
X1
8
DAC
WM2625
X2
OUTA
DIN
SCLK
NCS
8
SERIAL
DAC
X2
INTERFACE
AND
CONTROL
LOGIC
POWER-
2
DOWN AND
SPEED
CONTROL
OUTB
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.
TYPICAL PERFORMANCE
0.1
0.08
VDD = 5V, VREF = 2.048V, Speed = Fast Mode, TA = 25.5^OC
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
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.