AD5429 Datasheet, PDF (1/32 Pages) Analog Devices – Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface

FEATURES
10 MHz multiplying bandwidth
50 MHz serial interface
2.5 V to 5.5 V supply operation
±10 V reference input
Pin compatible 8-, 10-, and 12-bit DACs
Extended temperature range: −40°C to +125°C
16-lead TSSOP package
Guaranteed monotonic
Power-on reset
Daisy-chain mode
Readback function
0.5 µA typical current consumption
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
Dual 8-,10-,12-Bit High Bandwidth
Multiplying DACs with Serial Interface
AD5429/AD5439/AD5449
V_DD
SYNC
SCLK
SDIN
SDO
CLR
FUNCTIONAL BLOCK DIAGRAM
V_REFA
AD5429/AD5439/AD5449
RFB
R
SHIFT
REGISTER
INPUT
REGISTER
DAC
REGISTER
8-/10-/12-BIT
R-2R DAC A
POWER-ON
RESET
INPUT
REGISTER
LDAC
DAC
REGISTER
8-/10-/12-BIT
R-2R DAC B
LDAC
Figure 1.
V_REFB
RFB
R
R_FBA
I_OUT1A
I_OUT2A
I_OUT1B
I_OUT2B
R_FBB
GENERAL DESCRIPTION
The AD5429/AD5439/AD5449¹ 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 (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 utilize 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 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
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