WM2623 Datasheet, PDF (1/10 Pages) Wolfson Microelectronics plc – Low Power 8-bit Serial Input DAC

FEATURES
• 8-bit voltage output DAC
• Single supply from 2.7V to 5.5V
• Very low power consumption (3V supply):
- 900µW, slow mode
- 2.1mW, fast mode
- 3µW, standby mode
• DNL ±0.2 LSB, INL ±0.5 LSB (max)
• Monotonic over Temperature
• DSP compatible serial interface
• Programmable settling time of 3µs or 9µs 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
WM2623CD
WM2623ID
0° to 70°C
-40° to 85°C
8-pin SOIC
8-pin SOIC
WM2623
Low Power 8-bit Serial Input DAC
Production Data, October 2000, Rev 1.0
DESCRIPTION
The WM2623 is an 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
less than 1 µA.
The device has been designed for glueless interface to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2623 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 output stage is buffered by a rail-to-rail amplifier
with a gain of two, which features 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 WM2623 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(6)
DIN (1)
SCLK (2)
CSB (3)
FS (4)
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
data
POWER-ON
RESET
(5)
GND
REFERENCE
INPUT BUFFER
X1
8-BIT
DAC
LATCH
VDD
(8)
DAC
OUTPUT
BUFFER
X2
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
WM2623
(7) OUT
TYPICAL PERFORMANCE
0.1
AVDD = DVDD = 5V, VREF = 2.048V, Speed = Fast Mode, Load = 10kOhm/100pF
0.08
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]
http://www.wolfson.co.uk
Production Data Datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2000 Wolfson Microelectronics Ltd.