AD5429_13 Datasheet, PDF (1/28 Pages) Analog Devices – Dual 8-/10-/12-Bit, High Bandwidth, Multiplying DACs with Serial Interface

Data Sheet
Dual 8-/10-/12-Bit, High Bandwidth,
Multiplying DACs with Serial Interface
AD5429/AD5439/AD5449
FEATURES
10 MHz multiplying bandwidth
INL of ±0.25 LSB @ 8 bits
16-lead TSSOP package
2.5 V to 5.5 V supply operation
±10 V reference input
50 MHz serial interface
2.47 MSPS update rate
Extended temperature range: −40°C to +125°C
4-quadrant multiplication
Power-on reset
0.5 µA typical current consumption
Guaranteed monotonic
Daisy-chain mode
Readback function
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/AD5449¹ are CMOS, 8-, 10-, and 12-bit,
dual-channel, current output digital-to-analog converters (DAC),
respectively. These devices operate from a 2.5 V to 5.5 V power
supply, making them suited to battery-powered and other
applications.
As a result of being manufactured on a CMOS submicron process,
these parts offer excellent 4-quadrant multiplication character-
istics, with large signal multiplying bandwidths of 10 MHz.
The applied external reference input voltage (VREF) determines
the full-scale output current. An integrated feedback resistor
(RFB) provides temperature tracking and full-scale voltage
output when combined with an external current-to-voltage
precision amplifier.
These DACs use a double-buffered, 3-wire serial interface that
is compatible with SPI, QSPI™, MICROWIRE™, and most DSP
interface standards. In addition, a serial data out (SDO) pin 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 0s, and the DAC outputs are at zero scale.
The AD5429/AD5439/AD5449 DACs are available in 16-lead
TSSOP packages. The EV-AD5415/49SDZ evaluation board is
available for evaluating DAC performance. For more
information, see the UG-297 evaluation board user guide.
FUNCTIONAL BLOCK DIAGRAM
V_REFA
V_DD
SYNC
SCLK
SDIN
SDO
CLR
1 _{U.S. Patent Number 5,689,257.}
AD5429/AD5439/AD5449
SHIFT
REGISTER
INPUT
REGISTER
DAC
REGISTER
RFB
R
8-/10-/12-BIT
R-2R DAC A
R_FBA
I_OUT1A
I_OUT2A
POWER-ON
RESET
INPUT
REGISTER
LDAC
DAC
REGISTER
8-/10-/12-BIT
R-2R DAC B
LDAC
Figure 1.
V_REFB
RFB
R
I_OUT1B
I_OUT2B
R_FBB
Rev. E
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