TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 54 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
8.2.17 Write mode: data byte RADIO
Table 71. RADIO - format of data byte 0Fh with default setting
7 6 5 4 3 2 1 0
0 MONO DEMP RDCL NBS1 NBS0 NBL1 NBL0
0011010
Table 72. RADIO - data byte 0Fh bit description
Bit Symbol Description
7 - reserved; 0 = normal operation
6 MONO FM forced mono; stereo decoder disable option
0 = stereo decoder is set to FM stereo
1 = stereo decoder is set to FM mono
5 DEMP de-emphasis; selection of the de-emphasis time constant; see
Figure 31
0 = de-emphasis is 75 µs
1 = de-emphasis is 50 µs
4 RDCL RDS output mode
0 = direct output mode; clock output and data output; see
Figure 32
1 = buffered output mode; clock input and data output of 16-bit data
buffer and optional 3-bit demodulation quality (RDQ counter); see
Figure 33
3 and 2 NBS[1:0] noise blanker audio sensitivity
FM audio noise blanker sensitivity setting of FM MPX ignition noise
detector (peak value)
00 = 65 mV (high sensitivity)
01 = 100 mV
10 = 125 mV
11 = 160 mV (low sensitivity)
AM audio noise blanker sensitivity setting of audio ignition noise detector
00 = 16.5 V/ms
01 = 18.6 V/ms
10 = 21 V/ms
11 = 23.5 V/ms
1 and 0 NBL[1:0] noise blanker IF or level sensitivity
FM audio noise blanker sensitivity setting of FM level ignition noise
detector (peak value)
00 = 10 mV
01 = 25 mV
10 = 36 mV
11 = 50 mV
AM IF noise blanker sensitivity setting of IF ignition noise detector
00 = 1.4 V (low sensitivity)
01 = 1 V
10 = 0.7 V (high sensitivity)
11 = AM IF noise blanker disabled
