WM2636 Datasheet, PDF (1/10 Pages) Wolfson Microelectronics plc – 12-bit Serial Input Voltage Output DAC with Internal Reference

WM2636
12-bit Serial Input Voltage Output DAC
with Internal Reference
Production Data, July 1999, Rev 1.0
FEATURES
• 12-bit voltage output DAC
• Single supply from 2.7V to 5.5V
• DNL ±0.5 LSBs, INL ±2.0 LSBs
• Very low power consumption (3V supply):
- 4.2mW, slow mode
- 8.1mW, fast mode
• TMS320, (Q)SPI, and Microwire compatible serial
interface
• Programmable settling time of 3.5µs or 1µs typical
• High impedance reference input buffer
• Power down mode 10nA
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
• Speech synthesis
• Arbitrary waveform generation
ORDERING INFORMATION
DESCRIPTION
The WM2636 is a 12-bit voltage output, resistor string digital-to-
analogue converter that can be powered down under software
control. Power down reduces current consumption to 10nA.
An internal precision voltage reference is provided which can
source up to 1mA. This can therefore be used as an external
system reference.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2636 is programmed with a 16-bit serial word
comprising 4 control bits and 12 data bits.
Excellent performance is delivered with a typical DNL of 0.5
LSBs. 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.
The device is available in an 8-pin SOIC package. Commercial
temperature (0° to 70°C) and Industrial temperature (-40° to
85°C) variants are supported.
DEVICE
WM2636CD
WM2636ID
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
8-pin SOIC
8-pin SOIC
BLOCK DIAGRAM
VDD
(8)
REF(6)
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
X1
1.024V/2.048V
SELECTABLE
REFERENCE
DIN (1)
SCLK (2)
NCS (3)
FS (4)
2-BIT
REFERENCE
SELECT
LATCH
REFERENCE INPUT
BUFFER
X1
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
data
POWER-ON
RESET
12-BIT
DAC
LATCH
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
DAC
OUTPUT
BUFFER
X2
WM2636
(5)
AGND
(7) OUT
TYPICAL PERFORMANCE
1
VDD = 5V, 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: [phone]
Fax: [phone]
Email: [e-mail]
http://www.wolfson.co.uk
Production Data contain final specifications
current on publication date. Supply of
products conforms to Wolfson
Microelectronics’ Terms and Conditions.
1999 Wolfson Microelectronics Ltd.