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參數(shù)資料
型號(hào): AD7886TD
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: LC2MOS 12-Bit, 750 kHz/1 MHz, Sampling ADC
中文描述: 1-CH 12-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP28
封裝: SIDE BRAZED, CERAMIC, DIP-28
文件頁(yè)數(shù): 13/16頁(yè)
文件大小: 400K
代理商: AD7886TD
AD7886
–13–
REV. B
POWER SUPPLY CONNECTIONS
The PC board requires two analog power supplies and one 5 V
digital supply. Connections to the analog supply are made di-
rectly to the PC board as shown on the silkscreen in Figure 24.
The connections are labeled V+ and V–, and the range for both
of these supplies is 12 V to 15 V. Connection to the 5 V digital
supply is made through either of the two connectors (SKT3 or
SKT4). The +5 V analog supplies required by the AD7886 are
generated from voltage regulators on the V– and V+ power
supplies.
LINK OPTIONS
There are five link options, labeled LK1 to LK5, which must be
set before using the board.
LK1 Input Range Select
The AD7886 can accommodate three possible analog input
ranges: 0 V to 5 V, 0 to 10 V and +5 V. The link options are as
follows:
0 V to 5 V
Use Link C
0 V to 10 V
Use Link B
±
5 V
Use Link A
LK2 and LK3 Control Input Options
The evaluation board includes two latches to increase the data
access time when interfacing to the faster DSP machines. If
DB11
DB4
DB0
DB3
O/P
O/P
SUM
IN
OUT
GND
+V
78L05
IC5
CONVST
BUSY
CS
RD
GND
GND
CLK
CLK
D0
D7
D0
D1
D2
D3
Q7
Q0
74HC374
IC8
74HC374
IC9
D7
D4
Q7
Q0
V
CC
V
CC
SKT3
96-WAY
CONNECTOR
IN
OUT
GND
79L05
IC6
V
SS
–V
VIN1
LK5
CONVST
LK2
LK3
LK4
A31
DMD15
B11
DMD8
B18
EDMACK
ECE6 (OUT1)
OUT2
C22
B6
DMD7
DMD0
B20
B27
C11
EIRQ0
A9
C12
CS
RD
C14
C13
CONVST
DIGITAL
GND
A32/B32/
C32
V
SS
+
–V
V
OUT
AD586
IC3
+V
IN
GND
AD707
AGND
DGND
ANALOG
INPUT
AD845
–V
+V
+
C2
0.1
μ
F
C1
10
μ
F
C3
10
μ
F
C4
0.1
μ
F
C9/C17
10
μ
F
C10/C18
0.1
μ
F
+V
C6
0.1
μ
F
C5
10
μ
F
C15
10
μ
F
C16
0.1
μ
F
+V
C13
10
μ
F
C14
0.1
μ
F
C11
10
μ
F
C10
0.1
μ
F
C7
10
μ
F
C8
0.1
μ
F
C19
10
μ
F
C20
0.1
μ
F
C23
0.1
μ
F
IC1
AD7886
IC4
IC2
SKT2
SKT1
VIN2
A
B
C
LK1
V
DD
AGND
5V
+
5V
+
5V
+
5V
+
5V
+
V
DD
5REF
+
5V
V
REF
Figure 23. Data Acquisition Circuit Using the AD7886
these latches are not required, they may be removed and the
data digital paths shorted out, i.e., latch inputs Dx shorted to
outputs Qx using wire links in the latch sockets. When using the
latches, the AD7886 control inputs,
CS
and
RD
, must be tied
low via links 2 and 3. The latches are updated by the rising edge
of the
BUSY
signal at the end of every conversion. Data is then
read by asserting the latch output enable signals. The alternative
is to remove the latches and assert the ADC’s control inputs
from either of the connectors, SKT3 or SKT4, as outlined in
the data sheet.
Latches Included
Insert Link 2
Insert Link 3
LK4 Analog Input Option
LK4 connects the analog input to a component grid or to a
buffer amplifier that drives the ADC input.
LK5
Data format can be 16-bits parallel or two bytes for 8-bit pro-
cessors. There are two data enable controls for the 74HC374
latches, labeled
OUT1
and
OUT2
.
OUT1
enables the 8 MSBs
(IC8), and
OUT2
enables the 4 LSBs (IC9). Link options are:
for 16-bit format, include LK5, for a two byte read format,
remove LK5.
Latches Removed
Remove Link 2
Remove Link 3
相關(guān)PDF資料
PDF描述
AD7886JD LC2MOS 12-Bit, 750 kHz/1 MHz, Sampling ADC
AD7887 +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
AD7887AR +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
AD7887ARM +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
AD7887BR +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
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