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Wolfson Microelectronics plc |
WM2630
Octal 12-bit, Serial Input, Voltage Output DAC
with Internal Reference
Production Data, February 2001, Rev 1.1
FEATURES
• Eight 12-bit DACs in one package
• Dual supply 2.7V to 5.5V operation
• DNL ±0.5 LSBs, INL ±2.0 LSBs typ.
• Programmable settling time / power
(1.0µs typ. 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
DESCRIPTION
The WM2630 is an octal, 12-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 WM2630 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
W M2630CDT
W M2630IDT
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
20-pin TSSOP
20-pin TSSOP
BLOCK DIAGRAM
TYPICAL PERFORMANCE
1.024V / 2.048V
SELECTABLE
REFERENCE
DIN (2)
SCLK (3)
FS (4)
MODE (17)
PREB (5)
DOUT (19)
SERIAL
INTERFACE
AND
CONTROL
LOGIC
REF
(16)
AVDD
(11)
DVDD
(20)
DAC A
LATCH
RESISTOR
STRING
POWER/SPEED
CONTROL
REF
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)
1
0.75
0.5
0.25
0
-0.25
-0.5
-0.75
-1
0
512
1024
1536
2048
2560
3072
3584
4096
DIGITAL CODE
WOLFSON MICROELECTRONICS LTD
Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: [email protected]
www.wolfsonmicro.co.uk
Production Data datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
©2001 Wolfson Microelectronics Ltd.
WM2630
PIN CONFIGURATION
DGND
DIN
SCLK
FS
PREB
OUTE
OUTF
OUTG
OUTH
AGND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DVDD
DOUT
LOADB
MODE
REF
OUTD
OUTC
OUTB
OUTA
AVDD
PIN DESCRIPTION
PIN NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NAME
DGND
DIN
SCLK
FS
PREB
OUTE
OUTF
OUTG
OUTH
AGND
AVDD
OUTA
OUTB
OUTC
OUTD
REF
MODE
LOADB
DOUT
DVDD
TYPE
Supply
Digital input
Digital input
Digital input
Digital input
Analogue output
Analogue output
Analogue output
Analogue output
Supply
Supply
Analogue output
Analogue output
Analogue output
Analogue output
Analogue I/O
Digital input
Digital input
Digital output
Supply
DESCRIPTION
Digital Ground
Digital serial data input
Serial clock input
Frame sync input
Preset input
DAC Output E
DAC Output F
DAC Output G
DAC Output H
Analogue Ground
Analogue positive power supply
DAC Output A
DAC Output B
DAC Output C
DAC Output D
Voltage reference input / output
Input mode
Load DAC
Data serial data output
Digital positive power supply
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 1.1 February 2001
2
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