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WM2638ID Datasheet

  • WM2638ID

  • Dual 12-Bit Serial Input Voltage Output DAC with Internal re...

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  • WOLFSON

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WM2638
Dual 12-Bit Serial Input Voltage Output DAC
with Internal reference
Production Data, Rev 1.0, July 1999
FEATURES
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Two 12-bit voltage output DACs
Single 2.7V to 5.5V supply operation
DNL
鹵
0.4 LSBs, INL
鹵
2 LSBs
Low power consumption
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12mW typical in fast mode
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6mW typical in slow mode
TMS320, (Q)SPI鈩?, and Microwire鈩?compatible
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serial interface
Programmable settling time 1碌 s or 3.5碌 s typical
碌
碌
Power down mode 10nA
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擄 to 70擄C) and
Industrial temperature (-40擄 to 85擄C) variants are supported.
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APPLICATIONS
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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
DEVICE
WM2638CD
WM2638ID
TEMP. RANGE
0擄 to 70擄C
-40擄 to 85擄C
PACKAGE
8-pin SOIC
8-pin SOIC
BLOCK DIAGRAM
VDD
(8)
TYPICAL PERFORMANCE
c
1
5V = VDD, V
REF
= External, Speed = Fast mode, Load = 10k/100pF
0.8
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
REF(6)
X1
1.024V/2.048V
SELECTABLE
REFERENCE
0.6
0.4
2-BIT
REFERENCE
SELECT
LATCH
X1
DAC
OUTPUT
BUFFER
X2
(4) OUTA
DNL- LSB
(7) OUTB
REFERENCE
INPUT
BUFFER
0.2
0
DIN (1)
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
12-BIT
DAC A
LATCH
-0.2
REFERENCE
INPUT BUFFER
SCLK (2)
-0.4
X1
DAC
OUTPUT
BUFFER
X2
NCS (3)
-0.6
12-BIT
DAC B
HOLDING
LATCH
12-BIT
DAC B
LATCH
-0.8
-1
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
0
512
1024
1536
2048
DIGITAL CODE
2559
3071
3583
4095
POWER-ON
RESET
WM2638
(5)
AGND
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
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
漏1999
Wolfson Microelectronics Ltd
.

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