WM2618
Dual 12-bit Serial Input Voltage Output DAC
Production Data, October 2000, Rev 1.1
FEATURES
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Two 12-bit voltage output DACs
Single supply from 2.7V to 5.5V supply operation
DNL
±0.5
LSB, INL
±1.9
Low power consumption
- 3mW typical in slow mode
- 8mW typical in fast mode
TMS320, (Q)SPI, and Microwire compatible
serial interface
Programmable settling time 4µs or 12µs typical
DESCRIPTION
The WM2618 is a dual 12-bit voltage output, resistor string,
digital-to-analogue converter. A power-on-reset function
ensures repeatable start-up conditions.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2618 is programmed with a 16-bit serial word.
The WM2618 has a simple-to-use single 2.7V to 5.5V supply.
The digital inputs feature Schmitt triggers for high noise
immunity.
The number of clocks from the falling edge of NCS are counted
automatically. The device is then updated and disabled from
accepting further data inputs.
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 optimise speed versus power dissipation.
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.
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 telephone and communication systems
Speech synthesis
Arbitrary waveform generation
ORDERING INFORMATION
DEVICE
WM2618CD
WM2618ID
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
8-pin SOIC
8-pin SOIC
BLOCK DIAGRAM
VDD
(8)
REFIN(6)
REFERENCE
INPUT BUFFER
X1
DAC
OUTPUT
BUFFER
X2
REFERENCE
INPUT BUFFER
X1
DAC
OUTPUT
BUFFER
X2
(7) OUTB
(4) OUTA
TYPICAL PERFORMANCE
1
5V = VDD, V
REF
= 2.048V, Speed = Fast mode, Load = 10k/100pF
0.8
0.6
0.4
DNL - LSB
0.2
0
-0.2
-0.4
-0.6
-0.8
DIN (1)
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
data
12-BIT
DAC A
LATCH
SCLK (2)
NCS (3)
12-BIT
DAC B
HOLDING
LATCH
12-BIT
DAC B
CONTROL
LATCH
POWER-ON
RESET
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
-1
0
512
1024
1536
2048
DIGITAL CODE
2559
3071
3583
4095
WM2618
(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
datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2000
Wolfson Microelectronics Ltd
.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
