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Wolfson Microelectronics plc - Dual 12-Bit Serial Input Voltage Output DAC with Internal reference

Numéro de référence WM2638
Description Dual 12-Bit Serial Input Voltage Output DAC with Internal reference
Fabricant Wolfson Microelectronics plc 
Logo Wolfson Microelectronics plc 





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WM2638 fiche technique
WM2638
Dual 12-Bit Serial Input Voltage Output DAC
with Internal reference
Production Data, Rev 1.0, July 1999
FEATURES
Two 12-bit voltage output DACs
Single 2.7V to 5.5V supply operation
DNL ±0.4 LSBs, INL ±2 LSBs
Low power consumption
12mW typical in fast mode
6mW typical in slow mode
TMS320, (Q)SPI, and Microwirecompatible
serial interface
Programmable settling time 1µs or 3.5µs typical
Power down mode 10nA
APPLICATIONS
Battery powered test instruments
Digital offset and gain adjustment
Battery operated/remote industrial controls
Machine and motion control devices
Cellular telephones
Wireless telephones and communication systems
Speech synthesis
Arbitrary waveform generation
ORDERING INFORMATION
DESCRIPTION
The WM2638 is a dual 12-bit voltage output, resistor string, digital-
to-analogue converter. A software controlled power down mode is
provided that reduces current consumption to 10nA.
The WM2638 features an internal programmable voltage reference
simplifying overall system design. A reference voltage may also be
supplied externally.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2638 is programmed with a 16-bit serial word
comprising of a latch address, mode control bits and DAC or
control data.
Excellent performance is delivered with a typical DNL of 0.4LSBs.
The programmable settling time allows the designer to optimise
speed versus power consumption. The output stage is buffered by
a x2 gain near rail-to-rail amplifier.
The device is available in an 8-pin SOIC package ideal for space-
critical applications. Commercial temperature (0° to 70°C) and
Industrial temperature (-40° to 85°C) variants are supported.
DEVICE
WM2638CD
WM2638ID
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
8-pin SOIC
8-pin SOIC
BLOCK DIAGRAM
REF(6)
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
X1
1.024V/2.048V
SELECTABLE
REFERENCE
VDD
(8)
c
DIN (1)
SCLK (2)
NCS (3)
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
POWER-ON
RESET
(5)
AGND
2-BIT
REFERENCE
SELECT
LATCH
12-BIT
DAC A
LATCH
12-BIT
DAC B
HOLDING
LATCH
REFERENCE
INPUT
BUFFER
X1
REFERENCE
INPUT BUFFER
X1
12-BIT
DAC B
LATCH
DAC
OUTPUT
BUFFER
X2
(4) OUTA
DAC
OUTPUT
BUFFER
X2
(7) OUTB
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
WM2638
TYPICAL PERFORMANCE
1
5V = VDD, VREF = External, Speed = Fast mode, Load = 10k/100pF
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
512
1024
1536
2048
2559
DIGITAL CODE
3071
3583
4095
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
http://www.wolfson.co.uk
Production Data contains final specifications
current on publication date. Supply of products
conforms to Wolfson Microelectronics' Terms
and Conditions.
Last printed 15/07/99 15:58
©1999 Wolfson Microelectronics Ltd.

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