參數(shù)資料
型號： ADS7825PB
英文描述： 4 Channel, 16-Bit Sampling CMOS A/D Converter
中文描述： 4通道，16位采樣的CMOS A / D轉換
文件頁數(shù)： 8/16頁
文件大?。?/td> 342K
代理商： ADS7825PB
8
ADS7825
STARTING A CONVERSION
The combination of CS (pin 23) and R/C (pin 22) LOW for
a minimum of 40ns places the sample/hold of the ADS7825
in the hold state and starts conversion ‘n’. BUSY (pin 24)
will go LOW and stay LOW until conversion ‘n’ is com-
pleted and the internal output register has been updated. All
new convert commands during BUSY LOW will be ignored.
CS and/or R/C must go HIGH before BUSY goes HIGH or
a new conversion will be initiated without sufficient time to
acquire a new signal.
The ADS7825 will begin tracking the input signal at the end
of the conversion. Allowing 25
μ
s between convert com-
mands assures accurate acquisition of a new signal. Refer to
Tables Ia and Ib for a summary of CS, R/C, and BUSY states
and Figures 2 through 6 and Table II for timing information.
CS and R/C are internally OR’d and level triggered. There
is not a requirement which input goes LOW first when
initiating a conversion. If, however, it is critical that CS or
R/C initiates conversion ‘n’, be sure the less critical input is
LOW at least 10ns prior to the initiating input. If EXT/INT
(pin 12) is LOW when initiating conversion ‘n’, serial data
from conversion ‘n – 1’ will be output on SDATA (pin 16)
following the start of conversion ‘n’. See Internal Data
Clock in the Reading Data section.
To reduce the number of control pins, CS can be tied LOW
using R/C to control the read and convert modes. This will
have no effect when using the internal data clock in the serial
output mode. However, the parallel output and the serial
output (only when using an external data clock) will be
affected whenever R/C goes HIGH. Refer to the Reading
Data section and Figures 2, 3, 5, and 6.
TABLE Ia. Read Control for Parallel Data (PAR/SER = 5V.)
INPUTS
OUTPUTS
CS
1
X
0
R/C
X
0
1
BYTE
X
X
0
CONTC
X
X
X
PWRD
X
X
X
BUSY
X
X
X
D7
Hi-Z
Hi-Z
D15
(MSB)
D7
D6
Hi-Z
Hi-Z
D14
D5
Hi-Z
Hi-Z
D13
D4
Hi-Z
Hi-Z
D12
D3
Hi-Z
Hi-Z
D11
D2
Hi-Z
Hi-Z
D10
D1
Hi-Z
Hi-Z
D9
D0
Hi-Z
Hi-Z
D8
COMMENTS
Results from last
completed conversion.
Results from last
completed conversion.
Data will change at the
end of a conversion.
0
1
1
X
X
X
D6
D5
D4
D3
D2
D1
D0
(LSB)
↑↓
0
1
X
X
X
↑
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
D4
D3
D2
D1
D0
TAG
CS
R/C
CONTC PWRD
BUSY
D7, D6, D5 EXT/INT
SYNC
DATACLK
SDATA
Input
Input
Input
Input
Output
Output
Input
Output
I/O
Output
Input COMMENTS
1
X
0
X
0
↓
X
X
0
X
X
X
1
1
1
Hi-Z
Hi-Z
HI-Z
LOW
LOW
LOW
LOW
LOW
LOW
Output
Output
Output
Hi-Z
Hi-Z
Output
X
X
X
Starts transmission of data from previous
conversion on SDATA synchronized to 16
pulses output on DATACLK.
Starts transmission of data from previous
conversion on SDATA synchronized to 16
pulses output on DATACLK.
The level output on SDATA will be the level
input on TAG 16 DATACLK input cycles.
Input At the end of the conversion, when BUSY
rises, data from the conversion will be shifted
into the output registers. If
DATACLK
is HIGH,
valid data will be lost.
X
Initiates transmission of a HIGH pulse on
SYNC followed by data from last completed
conversion on SDATA synchronized to the
input on DATACLK.
X
Initiates transmission of a HIGH pulse on
SYNC followed by data from last completed
conversion on SDATA synchronized to the
input on DATACLK.
X
Starts transmission of data from previous
conversion on SDATA synchronized to 16
pulses output on DATACLK
X
SDATA becomes active. Inputs on DATACLK
shift out data.
X
SDATA becomes active. Inputs on DATACLK
shift out data.
X
Restarts continuous conversion mode (n – 1 data
transmitted when BUSY is LOW).
X
Restarts continuous conversion mode (n – 1 data
transmitted when BUSY is LOW).
↓
0
0
X
1
Hi-Z
LOW
LOW
Output
Output
X
0
1
0
X
X
Hi-Z
HIGH
LOW
Input
Output
Input
0
1
0
X
↑
Hi-Z
HIGH
LOW
Input
Output
0
↑
0
X
1
Hi-Z
HIGH
LOW
Input
Output
↓
1
0
X
1
Hi-Z
HIGH
LOW
Input
Output
0
0
1
0
↓
Hi-Z
LOW
LOW
Output
Output
↓
1
X
X
X
Hi-Z
HIGH
Output
Input
Output
0
↑
X
X
X
Hi-Z
HIGH
Output
Input
Output
↓
0
1
X
X
Hi-Z
LOW
LOW
Output
Output
0
↓
1
X
X
Hi-Z
LOW
LOW
Output
Output
TABLE Ib. Read Control for Serial Data (PAR/SER = 0V.)
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