TDA7210 Datasheet, PDF (21/52 Pages) Infineon Technologies AG – Wireless Components ASK/FSK Single Conversion Receiver

TDA7210
Functional Description
3.4.9 Peak Detector
The peak detector generates a DC voltage which is proportional to the peak
value of the receive data signal. An external RC network is necessary. The input
is connected to the output of the RSSI-output of the Limiter, the output is con-
nected to the PDO pin (Pin 26 ). This output can be used as an indicator for the
received signal strength to use in wake-up circuits and as a reference for the
data slicer in ASK mode. Note that the RSSI level is also output in case of FSK
mode.
3.4.10 Bandgap Reference Circuitry
A Bandgap Reference Circuit provides a temperature stable reference voltage
for the device. A power down mode is available to switch off all subcircuits which
is controlled by the PWDN pin (Pin 27) as shown in the following table. The sup-
ply current drawn in this case is typically 50nA.
Table 3-5 PDWN Pin Operating States
PDWN
Open or tied to ground
Tied to Vs
Operating State
Powerdown Mode
Receiver On
Wireless Components
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Data Sheet, December 2008