AD7225LP Analog Devices Inc, AD7225LP Datasheet - Page 11
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AD7225LP
Manufacturer Part Number
AD7225LP
Description
IC DAC 8BIT QUAD W/AMP 28-PLCC
Manufacturer
Analog Devices Inc
Datasheet
1.AD7225CRSZ.pdf
(24 pages)
Specifications of AD7225LP
Rohs Status
RoHS non-compliant
Settling Time
4µs
Number Of Bits
8
Number Of Converters
4
Voltage Supply Source
Dual ±
Power Dissipation (max)
500mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-LCC (J-Lead)
Data Interface
-
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Quantity
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Manufacturer:
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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.
V
limiting effects from the output amplifier during measurements.
REF
was limited to between 2 V and 3.24 V to avoid slew rate
–80
–70
–60
–50
–40
–30
V
REF
20k
Figure 14. Channel-to-Channel Isolation
= 1.24V p-p
INPUT FREQUENCY (Hz)
50k
100k
200k
V
V
T
500k
A
DD
SS
= 25°C
= –5V
= +15V
1M
Rev. C | Page 11 of 24
Figure 15. Suggested PCB Layout for AD7225, Component Side (Top View)
V
V
V
V
AGND
DGND
OUT
OUT
REF
REF
V
SS
B
A
B
A
MSB
PIN 1
SYSTEM
GND
LSB
V
V
V
V
V
OUT
OUT
DD
REF
REF
C
D
C
D
AD7225