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| 型號： | SDM873S |
| 英文描述： | 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS |
| 中文描述： | 16單端/ 8差分輸入12位數(shù)據(jù)采集系統(tǒng) |
| 文件頁數(shù)： | 20/27頁 |
| 文件大?。?/td> | 256K |
| 代理商： | SDM873S |
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SDM862/863/872/873
20
3. SURFACE MOUNT SOCKET
ADVANTAGES
DISADVANTAGES
Board thermal expansion
not so critical
Ease of component
replacement
Cost
Extra height (if critical)
Below is the name and address of a supplier of a 68-pin surface mountable
socket.
The part number is:
Socket
Spring cover
212-068-012
CCS-004
USA
EUROPE
Methode Electronics INC,
Interconnect Products Div.
1700 Hick Road,
Rolling Meadows, TX 75050
USA
PHONE: (312) 392-3500
Lucas Methode Connectors Ltd,
Halifax Road
Ingrow Bridge,
Keighley, Yorkshire BD21 5HR
UK
PHONE: 0535 603282
General Comments
The advantages and disadvantages of all the methods men-
tioned above are for general use of surface mount compo-
nents. Every user will find that the importance of these
factors will depend on his application and situation.
EVALUATION BOARD
For the engineer who wishes to evaluate the SDM family,
Burr-Brown has designed printed circuit boards on a single
‘Eurocard’ (shown here for LCC only). These boards enable
the design engineer to experiment with various accuracy
improvement techniques which are described below. Special
consideration has been given to the grounding and circuit
layout techniques required when dealing with 12-bit analog
signals.
The printed circuit board has been designed so that the
solutions to several of the problems likely to be encountered
by the user can be examined.
It should not be thought that every user is required to adopt
all of the techniques used on the circuit board. In many
applications very few external components will be required.
However, in following the application guidelines illustrated
by the circuitry and accompanying notes, the designer will
be able to select and adapt the solutions most suited to their
won particular application or problem area.
Provisions for the following are made on the LCC PC board:
—68 pin LCC socket (Burr-Brown Part No. MC0068).
—8 differential or 16 single-ended inputs.
—Input filtering with overvoltage protection for each chan-
nel.
—Socket for quad D-type flip-flop 74175 (MUX address
latches).
—7 additional I.C. sockets for easy interfacing to various
BUS systems (connection by wire wrap techniques).
—2 voltage regulators (15V).
—LC power supply decoupling.
The layout pays particular attention to the requirements
when operating with precision analog signals. This requires
strict separation of the analog and digital areas. Analog and
digital commons are totally separated and connected to-
gether only at the commons of the supply voltage. All
common lines are low resistance and low inductance.
SUPPLY VOLTAGES
In order to avoid coupling between the external supply
voltage 15V supplies, 2 voltage regulators (78M15, 79L15)
are provided on the PC board. The unregulated supply
voltage may vary from
±
17V to
±
25V.
The MUX/INA section and SHC/ADC section of the SDM
have separate supply lines which can be inductively
decoupled. This is recommended in order to suppress the
high frequency noise which comes from the ADC during
conversion.
The power supply rejection of the instrumentation amplifier
reduces with increasing frequency. If high frequency noise
on the supplies is not decoupled it will be injected into the
signal path and cause errors. This effect can be particularly
pronounced when using the ‘overlap’ mode since the instru-
FIGURE 25. Channel Select Truth Table.
SDM862/872
SDM863/873
Channel
Pair
Selected
MUX
ADD3
MUX
ADD2
MUX
ADD1
MUX
ADD0
MUX
Enable
Channel
Selected
MUX
ADD2
MUX
ADD1
MUX
ADD0
MUX
Enable
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
NONE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
X
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
X
L
H
L
H
L
H
L
H
–
–
–
–
–
–
–
–
L
H
H
H
H
H
H
H
H
NONE
0
1
2
3
4
5
6
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SDM863R | 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS |
| SDM863S | 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS |
| SDM872 | 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS |
| SDM872A | 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS |
| SDM872B | 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS |
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