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WM2632 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc

Part No. WM2632
Description  Octal 8-bit, Serial Input, Voltage Output DAC with Internal Rererence
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Maker  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
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WM2632 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc

 
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WM2632
Octal 8-bit, Serial Input, Voltage Output DAC
with Internal Reference
Production Data, April 2001, Rev 1.1
WOLFSON MICROELECTRONICS LTD
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
.
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
(1.0
µs typical in fast mode)
• Internal programmable voltage reference
• 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
DEVICE
TEMP. RANGE
PACKAGE
WM2632CDT
0
° to 70°C
20-pin TSSOP
WM2632IDT
-40
° to 85°C
20-pin TSSOP
DESCRIPTION
The WM2632 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 0.1
µA.
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 WM2632 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.
BLOCK DIAGRAM
TYPICAL PERFORMANCE
LATCH
POWER/SPEED
CONTROL
RESISTOR
STRING
(12) OUT A
DAC A
DIN (2)
SCLK (3)
FS (4)
PREB (5)
1.024V / 2.048V
SELECTABLE
REFERENCE
DOUT (19)
REF
(16)
DACs B, C, D, E, F, G, H
as DAC A
(6-9, 13-15)
OUT B to H
REF
SERIAL
INTERFACE
AND
CONTROL
LOGIC
MODE (17)
AVDD
(11)
DVDD
(20)
AGND
(10)
DGND
(1)
LOADB
(18)
-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


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