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AD5399 Datasheet

  • AD5399

  • Twos Complement, Dual 12-Bit DAC with Internal REF and Fast ...

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Twos Complement, Dual 12-Bit DAC
with Internal REF and Fast Settling Time
AD5399
FEATURES
2-channel 12-bit DAC
Twos complement facilitates bipolar applications
Bipolar zero with 2 V dc offset
Built-in 2.000 V precision reference with 10 ppm/擄C typ TC
Buffered voltage output: 0 V to 4 V
Single-supply operation: 4.5 V to 5.5 V
Fast 0.8 碌s settling time typ
Ultracompact MSOP-10 package
Monotonic DNL < 鹵1 LSB
Optimized accuracy at zero scale
Power-on reset to V
REF
3-wire serial data input
Extended temperature range: 鈥?0擄C to +105擄C
V
TP
V
DD
FUNCTIONAL BLOCK DIAGRAM
AD5399
脳2
X2
V
REF
2V
脳2
V
OUTB
V
BZ
鈥?2V = 0V
V
BZ
(V
REF
) = 2V
V
OUTA
V
BZ
+ 2V = 4V
AGND
DECODER SW
DRIVER A
12
DECODER SW
DRIVER B
12
DAC B
REGISTER
12
POWER-ON
RESET
03469-B-001
CS
CLK
SDI
DGND
EN
ADDR
DECODE
A0
16-BIT
D15...D0
DAC A
REGISTER
APPLICATIONS
Single-supply bipolar converter operations
General-purpose DSP applications
Digital gain and offset controls
Instrumentation level settings
Disk drive control
Precision motor control
Figure 1.
V
OUT
= ((D 鈥?2048)/4096 脳 4 V) + 2 V for 0 鈮?/div>
D
鈮?4095, where
D
is the decimal code.
Table 1. Examples of Twos Complement Codes
Twos Complement
2047
2046
1
0
4095
2049
2048
4.0
3.5
3.0
V
OUT
= [(0 鈥?2048)/4096 脳 4V] + 2V
2.5
GENERAL DESCRIPTION
The AD5399 is the industry-first dual 12-bit digital-to-analog
converter that accepts twos complement digital coding with 2 V
dc offset for single-supply operation. Augmented with a built-in
precision reference and a solid buffer amplifier, the AD5399 is
the smallest self-contained 12-bit precision DAC that fits many
general-purpose as well as DSP specific applications. The twos
complement programming facilitates the natural coding
implementation commonly found in DSP applications, and
allows operation in single supply. The AD5399 provides a 2 V
reference output, V
REF
, for bipolar zero monitoring. It can also
be used for other on-board components that require a precision
reference. The device is specified for operation from 5 V 鹵 10%
single supply with bipolar output swing from 0 V to 4 V
centered at 2 V.
The AD5399 is available in the compact 1.1 mm low profile
MSOP-10 package. All parts are guaranteed to operate over the
extended industrial temperature range of 鈥?0擄C to +105擄C.
D
4095
4094
2049
2048
2047
1
0
Scale
+FS
+FS 鈥?1 LSB
BZS + 1 LSB
BZS
BZS 鈥?1 LSB
鈥揊S + 1 LSB
鈥揊S
V
OUT
(V)
4.000
3.999
2.001
2.000
1.999
0.001
0.000
FS = Full Scale, BZS = Bipolar Zero Scale.
V
OUT
(V)
2.0
1.5
1.0
0.5
0
03469-B-002
0
512
1024
1536
2048
2560
3072
TWOS COMPLEMENT CODE
3584
4096
Figure 2. Output vs. Twos Complement Code
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
漏 2004 Analog Devices, Inc. All rights reserved.

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