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AD7225LRZ 데이터시트(PDF) 11 Page - Analog Devices

부품명 AD7225LRZ
상세설명  LC2MOS Quad 8-Bit DAC with Separate Reference Inputs
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AD7225LRZ 데이터시트(HTML) 11 Page - Analog Devices

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AD7225
Rev. C | Page 11 of 24
GROUND MANAGEMENT AND LAYOUT
Because the AD7225 contains four reference inputs that can be
driven from ac sources (see the AC Reference Signal section),
careful layout and grounding is important to minimize analog
crosstalk between the four channels. The dynamic performance
of the four DACs depends on the optimum choice of board
layout. Figure 14 shows the relationship between input fre-
quency and channel-to-channel isolation. Figure 15 shows a
printed circuit board layout that minimizes crosstalk and
feedthrough. The four input signals are screened by AGND.
VREF was limited to between 2 V and 3.24 V to avoid slew rate
limiting effects from the output amplifier during measurements.
–80
–70
–60
–50
–40
–30
20k
50k
100k
200k
500k
1M
INPUT FREQUENCY (Hz)
VDD = +15V
VSS = –5V
TA = 25°C
VREF = 1.24V p-p
Figure 14. Channel-to-Channel Isolation
VOUTC
VOUTB
VOUTD
VOUTA
VDD
VSS
VREFC
VREFB
VREFD
VREFA
MSB
LSB
PIN 1
SYSTEM
GND
DGND
AGND
Figure 15. Suggested PCB Layout for AD7225, Component Side (Top View)


유사한 부품 번호 - AD7225LRZ

제조업체부품명데이터시트상세설명
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Analog Devices		 AD7225LR AD-AD7225LR Datasheet
339Kb / 12P		    LC2MOS Quad 8-Bit DAC with Separate Reference Inputs
REV. B
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