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AD5380BSTZ-3 用户编程技术手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
DA转换器
封装:
LQFP-100
描述:
ANALOG DEVICES AD5380BSTZ-3 数模转换器, 14 bit, 400 kSPS, 并行、串行, 2.7V 至 3.6V, LQFP, 100 引脚
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AD5380BSTZ-3数据手册
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AN-1222
APPLICATION NOTE
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
40 Channels of Programmable Voltage with Excellent Temperature Drift
Performance Using the AD5380 DAC
Rev. B | Page 1 of 2
CIRCUIT FUNCTION AND BENEFITS
This circuit is a multichannel DAC configuration with excellent
temperature drift performance. It provides 40 individual output
voltage channels with 14 bits of resolution and a temperature
stability of typically less than 3 ppm/°C.
CIRCUIT DESCRIPTION
Table 1. Devices Connected/Referenced
Product Description
AD5380 40-Channel, 14-Bit, Voltage Output DAC
ADR421 Low Noise, 2.500 V XFET® Voltage Reference
ADR431 Ultralow Noise XFET Voltage Reference
Figure 1 shows a typical configuration for the AD5380-5 when
configured for use with an external reference. In the circuit shown,
all AGND, SIGNAL_GND, and DAC_GND pins are tied together
to a common AGND. AGND and DGND are connected together
at the AD5380 device. On power-up, the AD5380 defaults to
external reference operation.
This design uses two separate 5.0 V power supplies—one to
power the voltage reference and the analog portion of the
AD5380 (AVDD) and the other to power the digital portion
of the AD5380 (DVDD). For best performance, a linear regulator
should always be used to power the analog portion of the circuit. If
a switching regulator is used to power the digital portion, care
should be taken to minimize switching noise at the DVDD supply
pins. Additional decoupling using a series connected ferrite
bead may be required. The AD5380 digital (DVDD) power
supply can operate from a 3 V or 5 V supply, which provides for
maximum flexibility when interfacing to digital components.
Both supplies can be tied together to a common 5 V supply; it
is derived from a linear regulator. Refer to the ADIsimPower™
design tool for guidance on the power supply designs.
It is recommended to decouple each power pin close to the
device with a 0.1 µF ceramic and a 10 µF tantalum capacitor.
In this application, the reference for the AD5380 is provided
externally from either an ADR421 or ADR431 2.5 V reference.
The ADR431 provides a lower output voltage noise specification
for applications where that specification is important. The
reference should be decoupled at the REFOUT/REFIN pin
of the device with a 0.1 µF capacitor.
03731-039
ADR431/
ADR421
AD5380-5
AVDD DVDD
SIGNAL_GND
DAC_GND DGND
VOUT39
VOUT0
AGND
REFOUT/REFIN
REFGND
0.1µF
2.5V
10µF 0.1µF
0.1µF
5.0V 5.0V
Figure 1. AD5380 Typical Configuration with External Reference (Simplified Schematic)
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