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AD5428 Datasheet

  • AD5428

  • Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Seri...

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Dual 8-,10-,12-Bit High Bandwidth
Multiplying DACs with Serial Interface
AD5429/AD5439/AD5449
FEATURES
10 MHz multiplying bandwidth
50 MHz serial interface
2.5 V to 5.5 V supply operation
鹵10 V reference input
Pin compatible 8-, 10-, and 12-bit DACs
Extended temperature range: 鈭?0擄C to +125擄C
16-lead TSSOP package
Guaranteed monotonic
Power-on reset
Daisy-chain mode
Readback function
0.5 碌A(chǔ) typical current consumption
FUNCTIONAL BLOCK DIAGRAM
V
REF
A
AD5429/AD5439/AD5449
V
DD
SYNC
SCLK
SDIN
SDO
CLR
INPUT
REGISTER
LDAC
DAC
REGISTER
SHIFT
REGISTER
INPUT
REGISTER
DAC
REGISTER
8-/10-/12-BIT
R-2R DAC A
RFB
R
R
FB
A
I
OUT
1A
I
OUT
2A
POWER-ON
RESET
8-/10-/12-BIT
R-2R DAC B
I
OUT
1B
I
OUT
2B
R
FB
B
04464-0-001
RFB
R
LDAC
V
REF
B
Figure 1.
APPLICATIONS
Portable battery-powered applications
Waveform generators
Analog processing
Instrumentation applications
Programmable amplifiers and attenuators
Digitally controlled calibration
Programmable filters and oscillators
Composite video
Ultrasound
Gain, offset, and voltage trimming
GENERAL DESCRIPTION
The AD5429/AD5439/AD5449
1
are CMOS 8-, 10-, and 12-bit
dual-channel current output digital-to-analog converters,
respectively. These devices operate from a 2.5 V to 5.5 V power
supply, making them suited to battery-powered and other
applications.
The applied external reference input voltage (V
REF
) determines
the full-scale output current. An integrated feedback resistor
(R
FB
) provides temperature tracking and full-scale voltage
output when combined with an external current-to-voltage
precision amplifier.
These DACs utilize a double-buffered, 3-wire serial interface
that is compatible with SPI廬, QSPI鈩? MICROWIRE鈩? and most
DSP interface standards. In addition, a serial data out pin (SDO)
allows daisy-chaining when multiple packages are used. Data
readback allows the user to read the contents of the DAC
register via the SDO pin. On power-up, the internal shift
register and latches are filled with zeros and the DAC outputs
are at zero scale.
As a result of manufacture on a CMOS submicron process,
these parts offer excellent 4-quadrant multiplication character-
istics, with large signal multiplying bandwidths of 10 MHz.
The AD5429/AD5439/AD5449 DAC are available in 16-lead
TSSOP packages.
1
US Patent Number 5,689,257.
Rev. 0
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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