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ST70136G Datasheet

  • ST70136G

  • CPE ADSL ANALOG FRONT END

  • 362.26KB

  • 24頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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ST70136
CPE ADSL ANALOG FRONT END
s
WIDE TRANSMIT AND RECEIVE DYNAMIC
s
s
s
s
s
s
s
s
s
s
s
s
RANGE
TO
REDUCE
EXTERNAL
FILTERING REQUIREMENTS
RECEIVE PROGRAMMABLE GAIN: 0 TO
31dB GAIN IN 1dB STEPS
RECEIVE PROGRAMMABLE ATTENUATOR
0,-4dB, -8dB, -12dB
12-BIT A/D CONVERTER IN RECEIVE PATH
TRANSMIT PROGRAMMABLE GAIN: 0 TO
-15dB IN 1dB STEPS
14-BIT D/A CONVERTER IN TRANSMIT PATH
LOW POWER MODE: 10mW IN LISTENING
MODE, 250碌W IN POWER DOWN
TONE DETECTOR: ACTIVITY DETECTION
FOR WAKE-UP FUNCTION
64-PIN TQFP PACKAGE
64-PIN LFBGA PACKAGE
0.50碌m, 5V BICMOS TECHNOLOGY
3.3V DIGITAL INTERFACE
5V ANALOG INTERFACE
The AFE receive path contains a programmable
gain amplifier (RxPGA), a low pass anti-aliasing
filter, and a 12-bit A/D converter. The RxPGA is
digitally programmable from 0 to 31dB in 1dB
steps.
The AFE transmit path consists of a 14-bit D/A
converter, followed by a programmable gain
amplifier (TxPGA). The transmit gain is program-
mable from 0 to -15dB in 1dB steps.
TQFP64 Full Plastic
(10 x 10 x 1.40 mm)
ORDER CODE:
ST70136G
INTRODUCTION
The ST70136 ADSL Analog Front End (AFE) chip
implements the analog transceiver functions
required in a Customer Premise ADSL modem. It
connects the digital modem chip with the loop
driver and hybrid balance circuits.
The AFE has been designed with high dynamic
range in order to greatly reduce the external filter-
ing requirements at the front end.
The AFE chip and its companion digital chip along
with a loop driver, implement the complete
G.992.2 and G.992.1 DMT modem solution.
Figure 1 :
Overall Application Block Diagram
Software for Control xDSL
LFBGA64
(8 x 8 x 1.7 mm)
ORDER CODE:
ST70136B
PC
PCI
or
USB
PCI
or
USB
LINE
DMT
xDSL
AFE
LOOP
DRIVER
HYBRID
ST70137
ST70136
TS612/TS652
September 2001
1/24

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