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Eight 8-bit DACs in one package
Dual supply 2.7V to 5.5V operation
DNL
鹵0.1
LSBs, INL
鹵0.3
LSBs typical
Programmable settling time / power
(1.0碌s typical in fast mode)
Microcontroller compatible serial interface
Power down mode ( < 0.1碌A(chǔ))
Monotonic over temperature
Data output for daisy chaining
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 0.1碌A(chǔ).
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鈥檚 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擄 to 70擄C) and Industrial
temperature (-40擄 to 85擄C) variants are supported.
APPLICATIONS
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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
WM2629CDT
WM2629IDT
TEMP. RANGE
0擄 to 70擄C
-40擄 to 85擄C
PACKAGE
20-pin TSSOP
20-pin TSSOP
BLOCK DIAGRAM
REF
(16)
AVDD
(11)
DVDD
(20)
TYPICAL PERFORMANCE
0.04
0.03
DAC A
DIN (2)
SCLK (3)
FS (4)
MODE (17)
PREB (5)
DOUT (19)
VREF/2
SERIAL
INTERFACE
AND
CONTROL
LOGIC
LATCH
POWER/SPEED
CONTROL
RESISTOR
STRING
Differential Non-Linearity (LSBs)
0.02
0.01
0
-0.01
-0.02
-0.03
(12) OUT A
DACs B, C, D, E, F, G, H
as DAC A
(6-9, 13-15)
OUT B to H
-0.04
0
32
64
96
128
DIGITAL CODE
160
192
224
256
LOADB
(18)
AGND
(10)
DGND
(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鈥?Terms and Conditions.
餂?001
Wolfson Microelectronics Ltd
.
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