AD7874 Analog Devices, AD7874 Datasheet - Page 16

• Manufacturer Part Number: AD7874
• Description: LC2MOS 4-Channel/ 12-Bit Simultaneous Sampling Data Acquisition System
• Manufacturer: Analog Devices

AD7874
SHORTING PLUG OPTIONS
There are seven shorting plug options which must be set before
using the board. These are outlined below:
LK1–LK4
LK5
LK6
LK7
Connects the analog inputs to the buffer amplifi-
ers. The analog inputs may also be connected to a
component grid for signal conditioning.
Selects either the AD7874 internal clock or an ex-
ternal clock source.
Selects either the AD7874 internal reference or an
external reference source.
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.
Cerdip (Q-28)
Plastic (N-28)
Dimensions shown in inches and (mm).
OUTLINE DIMENSIONS
–16–
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
0.100 (2.54)
0.064 (1.63)
REF 3 PLCS
0.040 x 45
(1.02 x 45 )
1
0.050
(1.27
0.005
0.13)
0.055 (1.40)
0.045 (1.14)
NOTES
1. THIS DIMENSION CONTROLS THE OVERALL PACKAGE
THICKNESS.
2. APPLIES TO ALL FOUR SIDES.
3. ALL TERMINALS ARE GOLD PLATED.
LCCC (E-28A)
SOIC (R-28)
AD713 Quad Op Amp
AD7874 Analog-to-Digital Converter
MC78L05 +5 V Regulator
MC79L05 –5 V Regulator
74HC00 Quad NAND Gate
10 F Capacitors
0.1 F Capacitors
10 k Pull-Up Resistors
Shorting Plugs
BNC Sockets
26-Contact (2-Row) IDC Connector
BOTTOM VIEW
0.458 (11.63)
0.442 (11.23)
NO. 1 PIN INDEX
2
28
(1.91)
0.075
REF
0.028 (0.71)
0.022 (0.56)
0.020 x 45
(0.51 x 45 ) REF
REV. C