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參數(shù)資料
| 型號： | MAX132 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 18-Bit ADC with Serial Interface(±18-BIT，單通道，具有串行接口的ADC) |
| 中文描述： | ±18位ADC，串行接口 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 168K |
| 代理商： | MAX132 |
M
±18-Bit ADC with S erial Interfac e
______________________________________________________________________________________
11
Averaging 2 or 3 read-zero measurements provides the
most accurate read-zero value. Perform a read-zero
sequence whenever a large change in the input voltage
is expected.
Sleep Bit
When the sleep bit is set to 1, (bit D5 in command input
register 0), the low-power sleep mode starts when EOC
returns high. In sleep mode, the supply current is typi-
cally 1μA and the oscillator shuts down. The interface
remains active and data can be read. When exiting
sleep mode, the analog circuitry needs time to stabilize
before the next conversion starts. Accomplish this by
writing a dummy instruction to emerge from sleep
mode, and wait at least one conversion cycle before
writing a start instruction.
50Hz/60Hz
With a 32,768Hz crystal, the 50Hz/60Hz bit sets the
integrate period equal to one line cycle for 50Hz/60Hz
environments. When D6 (in command input register 0)
is set to 0, the integrate count is an integer multiple of
60Hz (32,768Hz/60Hz = 546 counts). When D6 is set to
1, the integrate input count is an integer multiple of
50Hz (32,768Hz/50Hz = 655 counts). Achieve the
greatest AC rejection by adjusting the integration peri-
od for 50Hz or 60Hz.
Start Conversion Bit
The start conversion bit (D7) in command input register
0 initiates a conversion when set to 1. The MAX132
immediately starts a conversion, stops at conversion
end, and then waits for the next start-bit command. A
start instruction is needed to initiate each conversion.
To initiate a continuous data stream, write a separate
start command for each conversion in three ways:
1) Wait longer than a known conversion time and then
write another start command.
2) Poll either the EOC status register bit or the EOC
line to determine conversion end and start time for
the next conversion. EOC becomes 1 at conversion
end at count 0000 of the conversion counter (Figure
10).
3) Set the start bit to 1 before a conversion end. The
internal conversion counter is then checked for its
count. If the count is 0000 (EOC = 1), a new conver-
sion starts and the conversion counter is set to
0001. The start bit resets to 0 after 5 clock cycles.
The MAX132 will not check the start bit again until
the conversion counter returns to a 0000 count. This
means a start command can be given any time after
0005 internal conversion count; the next conversion
starts when the counter returns to 0000.
DE-1
DE-2
DE-3
DE-4
X8-1
X8-2
X8-3
ZERO INT
ZERO INT
INT OUT
50Hz mode
655
INTEGRATE
264
545
38
145
679
MAX
545
MAX
SOFT
OVERRANGE
AREA
(SEE TEXT)
40
147
47
30
0001
0000
0111
INT START
RESET
60Hz
60Hz mode
659 667
CHOP
1600
1346
1638
1783
1823
1970
2017
2047
0000
RESET EVENTS
INTERNAL CONVERSION DATA LATCH
LATCH
EOC
Figure 10. Conversion Timing (Negative Input Shown)
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