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參數(shù)資料
| 型號(hào)： | AD7876CQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, Pseudo Bipolar, Fully Diff Input, 250kSPS Serial Out, 2.7V to 5.5V Micro Power Sampling ADC 8-MSOP -40 to 85 |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, CDIP24 |
| 封裝： | 0.300 INCH, CERDIP-24 |
| 文件頁(yè)數(shù)： | 16/20頁(yè) |
| 文件大小： | 331K |
| 代理商： | AD7876CQ |
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REV. B
AD7870/AD7875/AD7876
–16–
SK T 5 is a 9-way D-type connector that is meant for serial inter-
facing only. An inverted DB9/SCLK output is also provided on
this connector for systems that accept data on a rising clock
edge. T he SK T 5 pinout is shown in Figure 27.
Figure 27. SKT5, D-Type Connector Pinout
SK T 1, SK T 2 and SK T 3 are three BNC connectors which pro-
vide input connections for the analog input, the
CONVST
input
and an external clock input. T he use of an external clock source
is optional; there is a shorting plug (LK 2) on the ADC CLK in-
put that must be connected to either –5 V (for the ADCs own
internal clock) or to SK T 3.
POWE R SUPPLY CONNE CT IONS
T he PCB requires two analog power supplies and one 5 V digi-
tal supply . T he analog supplies are labelled V+ and V–, and the
range for both supplies is 12 V to 15 V (see silkscreen in Figure
29). Connection to the 5 V digital supply is made through any
of the connectors (SK T 4 to SK T 6). T he –5 V supply required
by the ADC is generated from a voltage regulator on the V–
power supply input (IC3 in Figure 27).
SHORT ING PLUG OPT IONS
T here are seven shorting plug options that must be set before
using the board. T hese are outlined below:
LK 1 Connects the analog input to a buffer amplifier. T he
analog input may also be connected to a component grid
for signal conditioning.
LK 2 Selects either the ADC internal clock or an external
clock source.
LK 3 Configures the ADC 12/
8
/CLK input for the appropri-
ate serial or parallel interface.
LK 4 Connects the ADC
RD
input directly to the two parallel
connectors or to a decoded
STRB
and R
/W
input. T his
shorting plug setting depends on the microprocessor e.g.,
the T MS32010 has a separate
RD
output while the
T MS32020 has
STRB
and R/
W
outputs.
LK 5– Connect the pull-up resistors R3, R4 and R5 to
SSTRB
,
LK 7 SCLK and SDAT A. T hese shorting plugs should be
removed for parallel interfacing.
COMPONE NT LIST
IC1
IC2
AD711 Op Amp
AD7870/AD7875/AD7876 Analog-to-
Digital Converter
MC79L05 –5 V Regulator
74HC00 Quad NAND Gate
74HC74 Dual D-T ype Flip Flop
10
μ
F Capacitors
IC3
IC4
IC5
C1, C3, C5, C7,
C9, C11
C2, C4, C6, C8,
C10, C12
R1, R2
R3*, R5*
R4*
LK 1, LK 2
LK 3, LK 4
LK 5, LK 6, LK 7
SK T 1, SK T 2, SK T 3 BNC Sockets
SK T 4
SK T 5
SK T 6
*Required for Serial Communication only.
0.1
μ
F Capacitors
10 k
Pull-Up Resistors
4.7 k
Pull-Up Resistors
2 k
Pull-Up Resistor
Shorting Plugs
26-Contact (2-Row) IDC Connector
9-Contact D-T ype Connector
96-Contact (3-Row) Eurocard Connector
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