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參數資料
| 型號： | AD7863AR-10 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | RECTIFIER SCHOTTKY DUAL 30A 30V 275A-ifsm 0.55V-vf 1mA-ir TO-3P 30/TUBE |
| 中文描述： | 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | MS-013AE, SOIC-28 |
| 文件頁數： | 16/18頁 |
| 文件大小： | 207K |
| 代理商： | AD7863AR-10 |
AD7863
–
16
–
REV. A
MULTIPLE AD7863
S
Figure 20 shows a system where a number of AD7863s can be
configured to handle multiple input channels. This type of con-
figuration is common in applications such as sonar, radar, etc.
The AD7863 is specified with typical limits on aperture delay.
This means that the user knows the difference in the sampling
instant between all channels. This allows the user to maintain
relative phase information between the different channels.
V
A1
V
B1
V
A2
V
B2
RD
AD7863
(1)
V
REF
RD
CS
V
A1
V
B1
V
A2
V
B2
AD7863
(2)
V
REF
RD
CS
V
A1
V
B1
V
A2
V
B2
AD7863
(n)
V
REF
RD
CS
ADDRESS
DECODE
ADDRESS
Figure 20. Multiple AD7863s in Multichannel System
A common read signal from the microprocessor drives the
RD
input of all AD7863s. Each AD7863 is designated a unique
address selected by the address decoder. The reference output
of AD7863 number 1 is used to drive the reference input of all
other AD7863s in the circuit shown in Figure 20. One V
REF
can be used to provide the reference to several other AD7863s.
Alternatively, an external or system reference can be used to
drive all V
REF
inputs. A common reference ensures good
full-scale tracking between all channels.
APPLICATIONS HINTS
PC Board Layout Considerations
The AD7863 is optimally designed for lowest noise perfor-
mance, both radiated and conducted noise. To complement the
excellent noise performance of the AD7863 it is imperative that
great care be given to the PC board layout. Figure 21 shows a
recommended connection diagram for the AD7863.
Ground Planes
The AD7863 and associated analog circuitry should have a
separate ground plane referred to as the analog ground plane
(AGND). This analog ground plane should encompass all
AD7863 ground pins (including the DGND pin), voltage refer-
ence circuitry, power supply bypass circuitry, the analog input
traces and any associated input/buffer amplifiers.
The regular PCB ground plane (referred to as the DGND for this
discussion) area should encompass all digital signal traces,
excluding the ground pins, leading up to the AD7863.
Power Planes
The PC board layout should have two distinct power planes,
one for analog circuitry and one for digital circuitry. The analog
power plane should encompass the AD7863 (V
DD
) and all asso-
ciated analog circuitry. This power plane should be connected
to the regular PCB power plane (V
CC
) at a single point, if neces-
sary through a ferrite bead, as illustrated in Figure 21. This bead
(part numbers for reference: Fair-Rite 274300111 or Murata
BL01/02/03) should be located within three inches of the AD7863.
The PCB power plane (V
CC
) should provide power to all digital
logic on the PC board, and the analog power plane (V
DD
)
should provide power to all AD7863 power pins, voltage refer-
ence circuitry and any input amplifiers, if needed. A suitable low
noise amplifier for the AD7863 is the AD797, one for each
input. Ensure that the +V
S
and the
–
V
S
supplies to each ampli-
fier are individually decoupled to AGND.
The PCB power (V
CC
) and ground (DGND) should not overlay
portions of the analog power plane (V
DD
). Keeping the V
CC
power and the DGND planes from overlaying the V
DD
will
contribute to a reduction in plane-to-plane noise coupling.
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