ST70134-ST70135A 데이터 시트보기 (PDF) - STMicroelectronics
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ST70134-ST70135A Datasheet PDF : 8 Pages
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ST70134 - ST70135A
ASCOT ICs
ASCOT consists of an Analog Front End
(ST70134) and a Discrete Multitone Modem
(ST70135A) integrated circuits which are
produced by STMicroelectronics.
Here below we will briefly go through the main
topics of both the ICs (see Figure 2 and Figure 3).
Analog Front End (ST70134)
HCMOS5A (0.5µm) mixed digital and analog
technology has been chosen to produce this
component that embodies the analog functions of
the ASCOT.
Automatic gain control amplifiers, placed at the
analog interface of transmit and receive paths,
allow to keep acceptable level of the signal ADC’s
and DAC’s resolution, that is 12-bit wide with
8.8MHz sampling rate.
A built-in driver allows for external clock
generation using a VCXO.
Figure 2 : Analog Front End block diagram
ST70134 Analog Front End’s main features:
– Rx low noise amplifier (0-31dB in 1dB steps
– Tx pre-driver amplifier (-15dB -0)
– Two input ports allow selection of RX signals,
e.g. with or without external attenuation
– Programmable low pass and band pass filters
– 12-bit DAC and ADC, sampling at 8.832MHz
– Xtal: 35.328MHz, ±50ppm, the accuracy of the
frequency is determined by the External XTAL
– Direct connection to ST70135A DMT modem
– Error correction on ADC output
– Analog and digital loop back modes
– Single 3.3V supply, or 3.3V analog and 3.0V
digital supplies
– Power dissipation 0.4W
– Power-down mode 0.1W
– TQFP64 (10 x 10mm body, 0.5mm pitch)
TRANSMIT-SIDE
12 Bits / 8.8MHz
4
MUX
DAC
VCODAC
XTAL DRIVER
LPF
138KHz
G = -15...0dB
STEP 1dB
RECEIVE-SIDE
12 Bits / 8.8MHz
4
MUX
DAC
LPF
1.1MHz
G = 0...31dB
STEP 1dB
LNA
3/8
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