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WM2627CDT Datasheet(PDF) 1 Page - Wolfson Microelectronics plc

Part # WM2627CDT
Description  Quad 8-Bit Serial Input Voltage Output DAC
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM2627CDT Datasheet(HTML) 1 Page - Wolfson Microelectronics plc

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WM2627
Quad 8-Bit Serial Input Voltage Output DAC
Production Data, April 2001, Rev 1.0
WOLFSON MICROELECTRONICS LTD
Lutton Court, 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
• Four 8-bit voltage output DACs
• Dual 2.7V to 5.5V supply (separate digital and analogue
supplies)
• DNL ±0.03 LSB, INL ±0.3 LSB typical
• Low power consumption:
-
3mW, slow mode - 3V supply
-
9mW, fast mode - 3V supply
• DSP and microprocessor compatible serial interface
• Programmable settling time of 2.5µs or 8.5µs typical
APPLICATIONS
• Battery powered test instruments
• Digital offset and gain adjustment
• Battery operated/remote industrial controls
• Machine and motion control devices
• Wireless telephone and communication systems
• Arbitrary waveform generation
• Robotics
ORDERING INFORMATION
DEVICE
TEMP. RANGE
PACKAGE
WM2627CDT
0° to 70°C
16-pin TSSOP
WM2627IDT
-40° to 85°C
16-pin TSSOP
DESCRIPTION
The WM2627 is a quadruple 8-bit voltage output, resistor string,
digital-to-analogue converter. Each DAC can be individually
powered down under software control. A hardware controlled
mode is provided that powers down all DACs. Power down
reduces current consumption to 1
µA.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs. It is programmed with a
16-bit serial word comprising of a DAC address, individual DAC
control bits and an 8-bit value.
The WM2627 has provision for two supplies: one supply for the
serial interface (DVDD, DGND), and one for the DACs,
reference buffers and output buffers (AVDD, AGND). This
enables a typical application where the device can be controlled
via a microprocessor operating on a 3V supply, with the DACs
operating on a 5V supply. Alternatively, the supplies can be tied
together in a single supply application.
Excellent performance is delivered with a typical DNL of
±0.03
LSB. The settling time of the DAC is programmable to allow the
designer to optimize speed versus power dissipation. The
output stage is buffered by a x2 gain near rail-to-rail amplifier,
which features a Class AB output stage. DACs A and B can
have a different reference voltage to DACs C and D.
The
device
is
available
in
a
16-pin
TSSOP
package.
Commercial
temperature
(0
° to 70°C) and Industrial
temperature (-40
° to 85°C) variants are supported.
BLOCK DIAGRAM
TYPICAL PERFORMANCE
(11) OUTD
(12) OUTC
(13) OUTB
(14) OUTA
10-BIT
DATA AND
CONTROL
HOLDING
LATCH
8-BIT
DAC
LATCH
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
REFINAB (15)
POWER-ON
RESET
DIN (4)
FS (7)
SCLK (5)
NCS (6)
(9)
AGND
(8)
DGND
(3)
NLDAC
(2)
NPD
AVDD
(16)
DVDD
(1)
X2
DAC A
DAC C
DAC D
POWERDOWN/
SPEED
CONTROL
WM2627
2-BIT
CONTROL
LATCH
REFINCD (10)
DAC B
X1
DAC
OUTPUT
BUFFER
data
REFERENCE
INPUT BUFFER
AVDD = DVDD = 5V, VREF = 2.048V, Slow Mode
-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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