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8-bit voltage output DAC
Single supply from 2.7V to 5.5V
Very low power consumption (3V supply):
- 900碌W, slow mode
-
2.1mW, fast mode
-
3碌W, standby mode
DNL
鹵0.2
LSB, INL
鹵0.5
LSB (max)
Monotonic over Temperature
DSP compatible serial interface
Programmable settling time of 3碌s or 9碌s typical
High impedance reference input buffer
DESCRIPTION
The WM2623 is an 8-bit voltage output, resistor string digital-to-
analogue converter. It can operate with supply voltages
between 2.7V and 5.5V and can be powered down under
software control. Power down reduces current consumption to
less than 1
碌A(chǔ).
The device has been designed for glueless interface to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2623 is programmed with a 16-bit serial word
including 4 control bits and 8 data bits.
Excellent performance is delivered with a typical DNL of
0.2LSBs. Monotonicity is guaranteed over the operating
temperature range. The settling time of the DAC is
programmable to allow for optimisation of speed versus power
dissipation. The output stage is buffered by a rail-to-rail amplifier
with a gain of two, which features a Class AB output stage.
The reference voltage input features a high impedance buffer
which eliminates the need to keep the reference source
impedance low.
The WM2623 is available in an 8-pin SOIC package.
Commercial (0擄 to 70擄C) and Industrial (-40擄 to 85擄C)
temperature range variants are available.
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APPLICATIONS
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Digital Servo Control Loops
Industrial Process Control
Battery powered instruments and controls
Machine and motion control devices
Digital offset and gain adjustment
ORDERING INFORMATION
DEVICE
WM2623CD
WM2623ID
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
0.1
AVDD = DVDD = 5V, V
REF
= 2.048V, Speed = Fast Mode, Load = 10kOhm/100pF
0.08
REFERENCE
INPUT BUFFER
REF(6)
X1
DAC
OUTPUT
BUFFER
X2
(7) OUT
0.06
DIN (1)
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
data
8-BIT
DAC
LATCH
0.04
SCLK (2)
CSB (3)
FS (4)
0.02
DNL (LSBs)
0
-0.02
POWER-ON
RESET
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
-0.04
WM2623
-0.06
(5)
GND
-0.08
-0.1
0
32
64
96
128
DIGITAL CODE
160
192
224
256
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鈥?Terms and Conditions.
餂?000
Wolfson Microelectronics Ltd
.
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