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參數資料
| 型號： | AD7992 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
| 中文描述： | 2通道，12位I2C兼容接口的ADC的10引腳MSOP |
| 文件頁數： | 19/21頁 |
| 文件大小： | 266K |
| 代理商： | AD7992 |
AD7992
–19–
REV. PrH
PRELIMINARY TECHNICAL DATA
Placing the AD7992-1 into High-speed Mode.
Hs-Mode communication commences after the master
addresses all devices connected to the bus with the Master
code, 00001XXX, to indicate that a High-Speed Mode
transfer is to begin. No device connected to the bus is
allowed to Acknowledge the High-Speed Master code,
therefore the code is followed by a not-Acknowledge, Fig-
Figure 15. Placing the part into Hs-Mode
MODES OF OPERATION
When supplies are first applied to the AD7992, the ADC
powers up in shutdown mode and will remain in this
power-down state while not converting. There are three
different methods of initiating a conversion on the
AD7992.
Mode 1 - Using CONVST Pin.
A conversion can be initiated on the AD7992 by pulsing
the
CONVST
signal. The conversion clock for the part is
internally generated so no external clock is required, ex-
cept when reading from, or writing to the serial port. On
the rising edge of
CONVST
the AD7992 will begin to
power up, see point A on Figure 16. The power up time
from power-down mode for the AD7992 is approximately
1 us. The
CONVST
signal must remain high for 1 μs for
the part to power up fully. Then
CONVST
can be
brought low after 1 μs. The falling edge of the
CONVST
signal places the track and hold into hold mode and a
conversion is also initiated at this point, see point B Fig-
ure 16. When the conversion is complete, approximately 2
us later, the part will return to shutdown (see point C
Figure 16) and remain so until the next rising edge of
CONVST
. The master can then read address the ADC to
obtain the conversion result. The address point register
must be pointing to the conversion result register in order
to read back the conversion result.
If the
CONVST
pulse does not remain high for more
than 1 μs, then the falling edge of
CONVST
will still
initiate a conversion but the result will be invalid as the
AD7992 will not be fully powered up when the conversion
takes place. The
CONVST
pin should not be pulsed
when reading from or writing to the serial port.
The Cycle Timer Register and the Command bits (C4 -
C1) in the Address Pointer Register should contain all 0’s
to operate the AD7992 in this mode. The
CONVST
pin
should be tied low for all other Modes of operation. Prior
to initiating a conversion in this mode, a write to the Con-
figuration Register is necessary to select the Channel for
conversion. To select both input channels for conversion
set D5 and D4 to 1 in the Configuration Register. The
ADC will service each channel in the sequence with each
CONVST
pulse.
ure 15. The master must then issue a repeated start fol-
lowed by the device Address with a R/
W
bit. The selected
device will then acknowledge its address.
All devices continue to operate in Hs-Mode until such a
time as the master issues a STOP condition. When the
STOP condition is issued the devices all return to F/S
Mode.
Figure 16. Mode 1 Operation
1
1
9
SCL
9
S
7-BIT ADDRESS
R
A
FIRST DATA BYTE (MSBs)
A
SECOND DATA BYTE (LSBs)
9
P
SDA
tCONVERT
tPOWER-UP
B
A
C
SDA
ACK. BY
AD7992
START BY
MASTER
HS-MODE MASTER CODE
SERIAL BUS ADDRESS BYTE
NACK.
1
9
1
9
0
1
A2
A1
A0
X
X
1
0
0
0
SCL
0
0
A3
X
Sr
FAST MODE
HIGH-SPEED MODE
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| AD7992BRM-0 | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
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相關代理商/技術參數 |
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|---|---|
| AD7992_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
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| AD7992BRM-0REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP T/R |
| AD7992BRM-1 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP 制造商:Rochester Electronics LLC 功能描述:2-CHANNEL, 12-BIT ADC WITH 12C ITF I.C. - Bulk |
| AD7992BRM-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP T/R |
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