參數(shù)資料
型號(hào)： MP3275
廠商： Exar Corporation
英文描述： Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem
中文描述： 故障保護(hù)16頻道，12位數(shù)據(jù)采集子系統(tǒng)
文件頁(yè)數(shù)： 6/16頁(yè)
文件大?。?/td> 138K
代理商： MP3275
MP3275
6
Rev. 4.00
PRODUCT INFORMATION
Basic Description
The MP3275 is a fault protected data acquisition subsystem
available in monolithic form. This product contains all of the cir-
cuitry necessary to acquire 16 channels of quasi differential or
single-ended analog signals at
bandwidth. Connections to power, the analog input signals and
the digital system are all that is required. The MP3275’s input
circuitry is protected against active input signals present with the
MP3275 power off. This is also the case for any channel exceed-
10 V input range and 15kHz
ing the MP3275 analog input dynamic range without interfering
with the channel being digitized. The channel address and
channel conversion can be managed in two ways: random
channel conversion or same channel conversion. Circuitry on
the chip adds a MUX/instrumentation amp settling delay of 10
μ
s
max, when a new channel is selected (ADEN = 1). Conversion
start is initiated without delay for the single-channel case (ADEN
= 0). Data is available in serial format.
TIMING
Control and Timing Considerations
The MP3275 can be operated in the stand-alone mode, with
one line for control and everything else hard-wired; or under mi-
croprocessor control, where changes can be made dynamically.
There are 4 control lines: ADEN, WR, CS and RD with their
functions described in Table 1.
Note 1: If RD = 1, SDO remain high impedance. It is recommended that RD will not change during a conversion in
order to reduce noise. It is further recommended that RD = 1 during conversion to reject any noise present on the
SDO.
Table 1. Logic Truth Table
CS
WR
RD
ADEN
Data
STL
STS
Comments
1
0
0
0
0
0
0
X
↓
↓
0
↑
1
1
X
1
1
1
1
1
1
X
0
1
X
X
X
X
––
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
0
0
↑
1
0
↓
0
0
0
0
0
↑
↑
↓
No operation
No operation if ADEN = 0
Input MUX channel selected, STL set on WR falling edge
MUX select disabled
Start convert on WR rising edge
Start convert on STL falling edge
STS goes low at end of conversion
0
0
0
0
0
0
1
X
X
1
X
↓
0
↑
X
0
0
X
X
X
X
X
0
––
ADC
Hi-Z
Hi-Z
0
0
0
0
1
0
0
0
0
1
0
↑
SDO enabled
Data from previous conversion on SDO
SDO disabled
SDO/RD disabled while STS high
Data from last conversion on SDO
STL, MUX select disabled with ADEN = 0,
SDO disabled on STS rising edge
New data appears on SDO on falling edge of STS
Last ADC
Hi-Z
0
0
X
ADC
0
↓
Read ADC Data (See Figure 2. and Table 3.)
ADC Channel Select and Start Convert (See Figure 1. and Table 2.)
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