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參數(shù)資料
| 型號(hào)： | STLC7545 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Enhanced V.34 BIS Analog Front-End(單片模擬前端) |
| 中文描述： | 國(guó)際清算銀行增強(qiáng).34模擬前端（單片模擬前端） |
| 文件頁數(shù)： | 9/53頁 |
| 文件大小： | 378K |
| 代理商： | STLC7545 |
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I - PIN DESCRIPTION
(continued)
I.3.4- AnalogInterface
(9 pins)
D/ACandA/DCPositiveReferenceVoltageout-
put
(V
REFP
)
This pin provides the Positive Reference Voltage
used by the 16-bit converters. The reference volt-
age, V
REF
, is the voltage difference between the
V
REFP
and V
REFN
outputs, andits nominal value is
2.5V. V
REFP
should be externally decoupled with
respectto V
CM
(seeFigure17).
D/AC and A/DC Negative Reference Voltage
(V
REFN
)
This pin provides the Negative ReferenceVoltage
usedbythe16 bit converters,andshouldbe exter-
nally decoupledwith respectto V
CM
.
Common Mode Voltage Output
(V
CM
)
This output pin is the common mode Voltage
(AV
DD
-AGND)/2 internally generated. This output
must be decoupled with respect to AGND. This
output pin could be forced externally (compatible
withST7544 application).
Smoothing filter positive Output
(TxA1)
Thispinis thepositiveoutputof thefullydifferential
analog smoothingfilter.
Smoothing filter negative Output
(TxA2)
Thispinisthenegativeoutputofthefullydifferential
analog smoothing single pole switch capacitor fil-
ter.OutputsTxA1andTxA2provideanalogsignals
with maximum peak to peak amplitude 2 x V
REF
,
and must be followed by an external continuous
time two polesmoothingfilter (see Figure16). The
smoothing filter order depends of the acceptable
transmit signal spectrum on the line. The cut-off
frequencyof theexternalfiltermustbegreaterthan
two times the transmit sampling frequency (Fsx),
so that the combined frequency response of both
the internal and external filters is flat in the pass
band.
Receive Positive Analog Input
(RxA1)
This pin is the differentialpositive A/DC Input.
Receive Negative Analog Input
(RxA2)
This pin is the differentialnegativeA/DC Input.
These analog inputs (RxA1,RxA2) are presented
to theSigmaDeltamodulator,theanaloginputpeak
to peak signal range must be less than 2 x V
REF
,
andmustbe preceededbyanexternalcontinuous-
time single pole anti-aliasing filter (see Figure 16).
The cut-off frequency of the filter must be lower
thanonehalfthetransmitover-samplingfrequency
(TxOSCK). These filters should be set as closeas
possible to the RxA1(RxA2) pins.
D/AC output for Eye Pattern
(EYEX,EYEY)
These pins are the outputs of two 8-bit digital to
analog converters used to monitor, on a CRT, the
X and Y quadraturesignals of the eye pattern of
the demodulatedsignal.
STLC7545
9/53
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