WM2629 Datasheet, PDF (1/13 Pages) Wolfson Microelectronics plc – Octal 8-bit, Serial Input, Voltage Output DAC with Power Down

WM2629
Octal 8-bit, Serial Input, Voltage Output DAC
with Power Down
Production Data, April 2001, Rev 1.0
FEATURES
• Eight 8-bit DACs in one package
• Dual supply 2.7V to 5.5V operation
• DNL ±0.1 LSBs, INL ±0.3 LSBs typical
• Programmable settling time / power
(1.0µs typical in fast mode)
• Microcontroller compatible serial interface
• Power down mode ( < 0.1µA)
• Monotonic over temperature
• Data output for daisy chaining
APPLICATIONS
• Battery powered test instruments
• Digital offset and gain adjustment
• Battery operated / remote industrial controls
• Programmable loop controllers
• CNC machine tools
• Machine and motion control devices
• Wireless telephone and communication systems
• Robotics
ORDERING INFORMATION
DESCRIPTION
The WM2629 is an octal, 8-bit, resistor string digital-to-analogue
converter. The eight individual DACs contained in the IC can be
switched in pairs between fast and slow (low power) operation
modes, or powered down, under software control. Alternatively,
the whole device can be powered down, reducing current
consumption to less than 0.1µA.
The DAC outputs are buffered by a rail-to-rail amplifier with a
gain of two, which is configurable as Class A (fast mode) or
Class AB (for low-power mode).
The WM2629 has been designed to interface directly to industry
standard microprocessors and DSPs, and can operate on two
separate analogue and digital power supplies. It is programmed
with a 16-bit serial word comprising 4 address bits and up to 12
DAC or control register data bits. All eight DACs can be
simultaneously forced to a preset value using a preset input pin.
A daisy-chain data output makes it possible to control several of
Wolfson’s octal DACs from the same interface, without
increasing the number of control lines.
The device is available in a 20-pin TSSOP package.
Commercial temperature (0° to 70°C) and Industrial
temperature (-40° to 85°C) variants are supported.
DEVICE
WM2629CDT
WM2629IDT
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
20-pin TSSOP
20-pin TSSOP
BLOCK DIAGRAM
TYPICAL PERFORMANCE
REF
(16)
AVDD
(11)
DVDD
(20)
DIN (2)
SCLK (3)
FS (4)
MODE (17)
PREB (5)
DOUT (19)
SERIAL
INTERFACE
AND
CONTROL
LOGIC
DAC A
LATCH
RESISTOR
STRING
POWER/SPEED
CONTROL
VREF/2
DACs B, C, D, E, F, G, H
as DAC A
(12) OUT A
(6-9, 13-15)
OUT B to H
LOADB
(18)
AGND
(10)
DGND
(1)
0.04
0.03
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
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.