WM2614 Datasheet, PDF (1/10 Pages) Wolfson Microelectronics plc – Quad 12-bit Serial Input Voltage Output DAC

WM2614
Quad 12-bit Serial Input Voltage Output DAC
Production Data, June 1999, Rev 1.0
FEATURES
• Quad 12-bit DAC voltage output DAC
• Dual 2.7V to 5.5V supply (separate digital and analogue
supplies)
• DNL ±0.4 LSB, INL ±1.5 LSB
• Low power consumption:
- 5.5mW, slow mode − 5V supply
- 3.3mW, slow mode − 3V supply
• TMS320, (Q)SPI™, and Microwire™ compatible serial
interface
• Programmable settling time of 4µs or 12µs typical
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
DEVICE
TEMP. RANGE
PACKAGE
WM2614CDT
0° to 70°C
16-pin TSSOP
WM2614IDT
-40° to 85 °C
16-pin TSSOP
DESCRIPTION
The WM2614 is a quadruple 12-bit voltage output, resistor string,
digital-to-analogue converter. Each DAC can be individually
powered down under software control. A hardware controlled mode
is provided that powers down all DACs. Power down reduces
current consumption to 10nA.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2614 is programmed with a 16-bit serial word
comprising of a DAC address, individual DAC control bits and a
12-bit value.
The WM2614 has provision for two supplies: one supply for the
serial interface (DVDD, DGND) and one for the DACs, reference
buffers and output buffers (AVDD, AGND). This enables a typical
application where the device can be controlled via a
microprocessor operating on a 3V supply, with the DACs operating
on a 5V supply. Alternatively, the supplies can be tied together in a
single supply application.
Excellent performance is delivered with a typical DNL of 0.4 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, which features a
Class AB output stage. DACs A and B can have a different
reference voltage to DACs C and D.
The device is available in a 16-pin TSSOP package.
Commercial temperature (0° to 70°C) and Industrial
temperature (-40° to 85°C) variants are supported.
BLOCK DIAGRAM
REFINAB (15)
REFINCD (10)
DIN (4)
FS (7)
SCLK (5)
NCS (6)
WM2614
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
data
DAC A
14-BIT
DATA AND
CONTROL
HOLDING
LATCH
AVDD
(16)
DVDD
(1)
REFERENCE
INPUT BUFFER
X1
12-BIT
DAC
LATCH
DAC
OUTPUT
BUFFER
X2
(14) OUTA
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
POWER-ON
RESET
(9)
AGND
(8)
DGND
DAC B
DAC C
DAC D
(3)
NLDAC
(2)
NPD
(13) OUTB
(12) OUTC
(11) OUTD
TYPICAL PERFORMANCE
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
AVDD = DVDD = 5V, VREF = 2.048V, Speed = Fast mode, Load = 10k/100pF
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 Datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ terms and conditions.
2614Mastera.doc June 18, 1999 14:36
©1999 Wolfson Microelectronics Ltd.