WM2627
Quad 8-Bit Seri al Input Voltage Output DAC
Production Data, Apri l 2001, Rev 1.0
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
www.wolfsonmicro.com
Production Data Datasheets contain final
specificati ons current on publi cation date.
Supply of products c onf orms t o Wolfson
Microelect roni cs’ Terms and Condit i ons.
2001 Wolfson Microelectronics Ltd.
FEATURES
• Four 8-bit voltage output DACs
• Dual 2.7V to 5.5V supply (separate digital and analogue
supplies)
• DNL ±0.03 LSB, INL ±0.3 LSB typical
• Low power consumption:
- 3mW, slow mode - 3V supply
- 9mW , fast mode - 3V supply
• DSP and microprocessor compatible serial interface
• Programmable settling time of 2.5µs or 8.5µs typical
APPLICATIONS
• Battery powered test instruments
• Digital offset and gain adjustment
• Battery operated/remote industrial controls
• Machine and motion control devices
• Wi reless telephone and communicati on systems
• Arbi trary waveform generation
• Robotics
ORDERING INFORMATION
DEVICE TEMP . RANGE PACKAGE
WM2627CDT 0° to 70°C 16-pin TSSOP
WM2627IDT -40° to 85°C 16-pin TSSOP
DESCRIPTION
The WM2627 is a quadruple 8-bit vol tage output, resis tor stri ng,
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 c urrent consumption to 1 µA.
The device has been designed to int erface ef fici ently to indus try
standard microprocessors and DSPs. It is programmed with a
16-bit seri al word comprisi ng of a DAC address, individual DAC
control bi ts and an 8-bit val ue.
The W M2627 has provision f or two supplies: one suppl y for the
serial interface (DVDD, DGND), and one for the DACs,
reference buffers and output buffers (AVDD, AGND). This
enables a typical applicat ion where the device can be c ontrolled
via a microprocessor operating on a 3V supply, with the DACs
operating on a 5V s upply. Al ternatively, the suppli es can be t ied
together in a single supply appl i cation.
Excellent performance is delivered with a typical DNL of ±0.03
LSB. The s ettli ng tim e of the DAC i s programm able t o 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
tem perat ure (-40° to 85°C) variants are supported.
BLOCK DIAGRAM TYPICAL PERFORMANCE
(11) OUTD
(12) OUTC
(13) OUTB
(14) OUTA
10-BIT
DATA AND
CONTROL
HOLDING
LATC H
8-BIT
DAC
LATCH
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
REFINAB (15)
POWER-ON
RESET
DIN (4)
FS (7)
SCLK (5)
NCS (6)
(9)
AGND
(8)
DGND
(3)
NLDAC
(2)
NPD
AVDD
(16)
DVDD
(1)
X2
DAC A
DAC C
DAC D
POWERDOWN/
SPEED
CONTROL
WM2627
2-BIT
CONTROL
LATCH
REFINCD (10)
DAC B
X1
DAC
OUTPUT
BUFFER
data
REFERENCE
INPUT BUFFER
AVDD = DVDD = 5V, VREF = 2.048V, Slow Mode
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
0 32 64 96 128 160 192 224 256
DIGITAL CODE
Differential Non-Linearity (LSBs)
