TDA5230 Datasheet, PDF (161/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Register Descriptions
Dual: ANDTHRES and BNDTHRES: FSK Noise Detector Threshold
ADDR: 0x80 and 0xA0
Reset Value: 0x00
Bit R/W Description (For detailed procedure refer to application note.)
7:0 W NDTHRES: FSK Noise Detector Threshold¹⁾
See application notes “How to choose an Application specific Signal Detection
Threshold for TDA523x based ASK Mode Applications” and “How to Choose an
Application Specific Signal- and Noise-Detection Threshold for TDA523x based FSK
Mode Applications” for specific procedure to determine this threshold by application.
1) For threshold calculation use the FSKNP: FSK Noise Power register.
Dual: ANDCONFIG and BNDCONFIG: FSK Noise Detector configuration
ADDR: 0x81 and 0xA1
Reset Value: 0x00
Bit R/W Description
5:4 W NDSEL: FSK Noise Detector Selection
00b: Squelch only (signal power)
• signal power detection only (related registers Dual: ASIGDET0 and
BSIGDET0: Signal detector (Run Mode), Dual: ASIGDET1 and
BSIGDET1: Signal detector (Wake Up) and ASKNP: ASK Noise
Power). This mode should be used for ASK and FSK.
01b: FSK Noise Detector only (noise power)
• noise power detection only (related registers Dual: ANDTHRES and
BNDTHRES: FSK Noise Detector Threshold and FSKNP: FSK Noise
Power). This mode should be used for FSK signals with small
deviations.
10b: Both (Squelch and FSK Noise Detector)
• signal and noise power detection simultaneous.
11b: Squelch and (FSK Noise Detector and SIGDETLO threshold)
• signal and noise power detection simultaneous but the FSK noise detect
signal is valid if the SIGDETLO threshold is exceeded only. This mode
is used for FSK with low FSK deviations.
3:2 W ND(3:2): FSK Noise Detector configuration: threshold level
use 01b:
1:0 W ND(1:0) FSK Noise Detector configuration: Peak-Detector slew rate
use 11b
Data Sheet
157
Version 4.0, 2007-06-01