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ST70136G データシート(PDF) 5 Page - STMicroelectronics

部品番号 ST70136G
部品情報  CPE ADSL ANALOG FRONT END
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST70136G データシート(HTML) 5 Page - STMicroelectronics

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2 - PIN DESCRIPTION
2.1 - Analog Power Supplies
These pins are the positive analog power supply
voltage for the DAC and the ADC section. It is not
internally connected to digital supply. In any case
the voltage on these pins must be higher or equal
to the voltage of the Digital power supply.
2.2 - Digital Power Supplies
These pins are the power supply pins that are
used by the internal digital circuitry. All DVDD pins
must be connected together to a +3.3 V supply.
2.3 - Analog Ground and Substrate
These pins are the ground return of the analog
DAC and ADC blocks. The analog VDDA should
be decoupled with respect to the analog ground.
Decoupling capacitors should be as close as pos-
sible to the supplies pins. All grounds must be tied
together.
2.4 - Digital Ground
These pins are the ground return of the digital cir-
cuitry. The digital power supplies must should be
decoupled with respect to the digital ground.
Decoupling capacitors should be as close as pos-
sible to the supplies pins. All grounds must be tied
together.
2.5 - Powerdown - PWD
When pin PWD =”1”, the chip is set in low power
mode.
2.6 - Suspend
The SUSPEND pin is used to control the output of
CLKM. When SUSPEND is low CLKM output is
enabled otherwise CLKM is disabled.
2.7 - Reset
The reset function is implied when the NRESET
pin is at a low voltage input level. In this condition,
the reset function can be easily used for power up
reset conditions. Reset is asynchronous, tenths of
ns are enough to put the IC in reset. After reset, all
registers are set to their default value.
2.8 - Reference Voltages
2.8.1 - V125AD, V250AD, V375AD
These pins are used to externally decouple the
internal reference voltages used for the ADC
(1.25V, 2.5V, 3.75V).
2.8.2 - V3P75V
This pin is the 3.75V Bandgap output and should
be externally decoupled with an external capacitor
of 0.22uF.
2.8.3 - IREF50U
This pin is used for setting the bias current and
must be externally connected to a resistor of
2.5V / 50
µA equals 50k
Ω.
2.8.4 - V290DA
This pin is the 2.9V transmit DAC output reference
voltage and must be decoupled externally.
2.9 - Analog Transmit Output
2.9.1 - TXP
This pin is the non-inverting output of the fully dif-
ferential analog amplifier.
2.9.2 - TXN
This pin is the inverting output of the fully differen-
tial analog amplifier.
2.9.3 - TXIP
This pin is the differential non-inverting input for
external filtering.
2.9.4 - TXIN
This pin is the differential inverting input for exter-
nal filtering.
2.9.5 - PGAP
This pin is the differential non-inverting PGA out-
put.
2.9.6 - PGAN
This pin is the differential inverting PGA output.
2.10 - Analog Receive Input
2.10.1 - RXN
This pin is the differential inverting receive input.
2.10.2 - RXP
This pin is the differential non-inverting receive
input.
2.11 - Tone Detector
The analog input differential signal must be less
than 8V peak to peak. These pins are used for
activity detection when in sleeping mode.
2.11.1 - TON
This pin is the differential inverting tone detector
input.


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