TDA5230XT Infineon Technologies, TDA5230XT Datasheet - Page 72

• Manufacturer Part Number: TDA5230XT
• Manufacturer: Infineon Technologies

Specifications of TDA5230XT

• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4.4mm
• Product Length (mm): 9.7mm
• Lead Free Status / Rohs Status: Compliant

Figure 33
The true RSSI signal is calculated by the following rule:
The result of this calculation is about -1 for no input signal (=noise), and about +1 for
large input signals (e.g. -10 dBm).
The RSSI Signals are also sampled by an AD converter, with four differential input
signals for the RSSI and the RSSI voltage reference. The true RSSI is automatically
calculated, using the following formula and the result stretched to values from 0 to 255.
The digital output of the ADC is used for processing ASK modulated data, and for two
peak detectors, which are accessible via SFRs and are described in
RSSI Peak
important that the true RSSI level at noise is >-0.92, which means it is clearly inside the
ADC range. Otherwise, small input signals are not recognized and sensitivity is
decreased.
Data Sheet
2,50 V
2,00 V
0,50 V
1 ,50 V
1 ,00 V
Detector. The range of the ADC is smaller than the range of real RSSI. It is
Typical RSSI+ over Input Signal Power
-1 25
RSSI
-1 1 5
Typical RSSI+ over Input Signal Power
RSSI
=
-1 05




RSSI+
------------------------------------------------ -
REF+
=
-95


RSSI+
-------------------------------------------------
REF+
Input Signal Pow er [dBm]
-85
–
–
68
REF-
RSSI-
–
–
-75
REF-
RSSI-


+
-65
1




×
1
-- -
2
-55
×
255
Functional Description
-45
Version 4.0, 2007-06-01
Chapter 2.4.8.3
-35
trimmed
TDA523x
-25