AD7874BR View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD7874BR Datasheet PDF : 16 Pages
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AD7874
SHORTING PLUG OPTIONS
There are seven shorting plug options which must be set before
using the board. These are outlined below:
LK1–LK4 Connects the analog inputs to the buffer amplifi-
ers. The analog inputs may also be connected to a
component grid for signal conditioning.
LK5
Selects either the AD7874 internal clock or an ex-
ternal clock source.
LK6
Selects either the AD7874 internal reference or an
external reference source.
LK7
Connects the AD7874 RD input directly to the
RD input of SKT8 or to a decoded STRB and
R/W input. This shorting plug setting depends on
the microprocessor, e.g., the TMS32020 and
68000 require a decoded RD signal.
COMPONENT LIST
IC1
IC2
IC3
IC4
IC5
C1, C3, C5, C7, C9
C2, C4, C6, C8, C10
R1, R2
LK1, LK2, LK3
LK4, LK5, LK6
LK7
SKT1, SKT2, SKT3,
SKT4, SKT5, SKT6,
SKT7
SKT8
AD713 Quad Op Amp
AD7874 Analog-to-Digital Converter
MC78L05 +5 V Regulator
MC79L05 –5 V Regulator
74HC00 Quad NAND Gate
10 µF Capacitors
0.1 µF Capacitors
10 kΩ Pull-Up Resistors
Shorting Plugs
BNC Sockets
26-Contact (2-Row) IDC Connector
Plastic (N-28)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
SOIC (R-28)
Cerdip (Q-28)
0.100 (2.54) 1
0.064 (1.63)
LCCC (E-28A)
0.055 (1.40)
0.045 (1.14)
0.075
(1.91)
REF
0.050 ± 0.005
(1.27 ± 0.13)
28
NO. 1 PIN INDEX
BOTTOM VIEW
0.028 (0.71)
0.022 (0.56)
0.040 x 45°
(1.02 x 45°)
REF 3 PLCS
0.020 x 45°
(0.51 x 45°) REF
0.458 (11.63) 2
0.442 (11.23)
NOTES
1. THIS DIMENSION CONTROLS THE OVERALL PACKAGE
THICKNESS.
2. APPLIES TO ALL FOUR SIDES.
3. ALL TERMINALS ARE GOLD PLATED.
–16–
REV. C
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