tda5051at-c1 NXP Semiconductors, tda5051at-c1 Datasheet - Page 5

• Manufacturer Part Number: tda5051at-c1
• Description: Home Automation Modem
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The DAC and the power stage are set in order to provide
a maximum signal level of 122 dB V (RMS) at the output.
The output of the power stage (TX
connected to a decoupling capacitor, because of a DC
level of 0.5V
device is not transmitting. This pin must also be protected
against overvoltage and negative transient signals.
The DC level of TX
transient suppressor, as shown in the application diagram;
see Fig.18.
Direct connection to the mains is done through an LC
network for low-cost applications. However, a HF signal
transformer could be used when power-line insulation has
to be performed.
Reception mode
The input signal received by the modem is applied to a
wide range input amplifier with AGC ( 6 to +30 dB). This is
basically for noise performance improvement and signal
level adjustment, which ensures a maximum sensitivity of
the ADC. An 8-bit conversion is then performed, followed
by digital band-pass filtering, to meet the CISPR
normalization and to comply with some additional
limitations met in current applications.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling MOS devices.
1999 May 31
V
f
T
T
T
In transmission mode, the receiving part of the circuit is
not disabled and the detection of the transmitted signal
is normally performed. In this mode, the gain chosen
before the beginning of the transmission is stored, and
the AGC is internally set to 6 dB as long as DATA
is LOW. Then, the old gain setting is automatically
restored.
osc
SYMBOL
stg
amb
j
DD
Home automation modem
DD
supply voltage
oscillator frequency
storage temperature
ambient temperature
junction temperature
at this pin, which is present even when the
OUT
can be used to bias a unipolar
CAUTION
OUT
) must always be
PARAMETER
IN
5
After digital demodulation, the baseband data signal is
made available after pulse shaping.
The signal pin (RX
to be protected and DC decoupled for the same reasons
as with pin TX
input requires an efficient 50 Hz rejection filter (realized by
the LC coupling network), which also acts as an
anti-aliasing filter for the internal digital processing;
see Fig.18.
Data format
T
The data input (DATA
burst is generated on the line (pin TX
pin is LOW.
Pin TX
device is not transmitting. Successive logic 1s are treated
in a Non-Return-to-Zero (NRZ) mode, see pulse shapes in
Figs 8 and 9.
R
The data output (pin DATA
that the data output is LOW when a burst is received.
Pin DATA
Power-down mode
Power-down input (pin PD) is active HIGH; this means that
the power consumption is minimum when pin PD is HIGH.
Now, all functions are disabled, except clock generation.
RANSMISSION MODE
ECEPTION MODE
OUT
OUT
is in a high-impedance state as long as the
remains LOW as long as a burst is received.
OUT
. The high sensitivity (82 dB V) of this
4.5
IN
50
10
) is a high-impedance input which has
MIN.
IN
) is active LOW: this means that a
OUT
) is active LOW; this means
5.5
12
+150
+80
125
MAX.
Product specification
OUT
TDA5051A
) when DATA
V
MHz
C
C
C
UNIT
IN