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AD7871 View Datasheet(PDF) - Analog Devices

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AD7871 Datasheet PDF : 24 Pages
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AD7871/AD7872
INTERFACE CONNECTIONS
There are two parallel connectors labeled SKT4 and SKT6, and
one serial connector labeled SKT5. A shorting plug option (LK3
in Figure 29) configures the ADC for the appropriate interface.
SKT6 is a 96-contact (3-row) Eurocard connector that is
directly compatible with the DSP processor evaluation board
prototype expansion connector. The expansion connector on
the DSP processor has eight decoded chip enable outputs
labeled ECE1 to ECE8. ECE6 is used to drive the AD7871 CS
input on the board. To avoid selecting the on-board RAM
sockets at the same time, remove LK6 on the DSP processor
board. In addition, the DSP processor expansion connector has
four interrupts labelled EIRQ0 to EIRQ3. The AD7871 BUSY/
INT output connects to EIRQ0. There is a single wait state
generator connected to EDMACK to allow the AD7871 to
interface to the faster versions of the DSP processor.
SKT4 is a 26-way (2-row) IDC connector. This contains the
same signal contacts as SKT6 except for EDMACK, which is
connected to SKT6 only. It also contains decoded R/W and
STRB inputs necessary for DSP processor interfacing.
SKT5 is a 5-way D-type connector meant for serial interfacing
only. An inverted DB11/SCLK output is also provided on this
connector for systems that accept data on a rising clock edge.
SKT1, SKT2, and SKT3 are three BNC connectors providing
connections for the analog input, the CONVST input and an
external clock.
R/W 1
RD 3
CS 5
NC 7
DB12/SSTRB 9
DB10/SDATA 11
DB8/LOW 13
DB6/LOW 15
DB4/DB12 17
DB2/DB10 19
DB0/DB8 21
5V 23
GND 25
2 STRB
4 NC
6 NC
8 BUSY/INT
10 DB13/HBEN
12 DB11/SCLK
14 HB9/LOW
16 DB7/LOW
18 DB5/DB13
20 DB3/DB11
22 DB1/DB9
24 5V
26 GND
NC = NO CONNECT
Figure 27. SKT4 Pinout
Data Sheet
1234 5
6789
NC = NO CONNECT
Figure 28. SKT5 Pinout
POWER SUPPLY CONNECTIONS
The PCB requires two analog power supplies and one 5 V logic
supply. The analog supplies are labelled V+ and V−, and the
range for both supplies is 12 V to 15 V. Connection to the 5 V
digital supply is made through any of the SKT4 to SKT6
connectors. The ±5 V supply required by the AD7871/AD7872
is generated from voltage regulators on the V+ and V− power
supplies input (IC6 and IC7 in Figure 29).
SHORTING PLUG OPTIONS
There are seven shorting plug options which must be set before
using the board. These are outlined in Table 7.
Table 7.
Plug Description
LK1 Connects the analog input to a buffer amplifier. The
analog input may also be connected to a component
grid for signal conditioning.
LK2 Selects either the AD7871/AD7872 internal clock or an
external clock source.
LK3 Configures the AD7871 14/8/CLK input for the
appropriate serial or parallel interface.
LK4 Connects the AD7871 RD input directly to the two
parallel connectors or to a decoded STRB and R/W input.
LK5 Connects the R3 pull-up resistor to SSTRB.
LK6 Connects the R4 pull-up resistor to SCLK.
LK7 Connects the R5 pull-up resistor to SDATA.
Remove LK5 to LK7 for parallel interfacing.
Rev. E | Page 18 of 24
 

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