TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 43 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
The input control value for weak signal control derived from USN is denoted by V
eq.LEVEL
;
equivalent level voltage. This indicates a weak signal control amount equal to the weak
signal control generated by a certain V
LEVEL
voltage.
The USS setting does not influence the I
2
C-bus read quality information of USN; read
data byte 2, USN/WAM; see Table 12.
The input control value for weak signal control derived from WAM is denoted by V
eq.LEVEL
;
equivalent level voltage. This indicates a weak signal control amount equal to the weak
signal control generated by a certain V
LEVEL
voltage.
The WAS setting does not influence the I
2
C-bus read quality information of WAM; read
data byte 2, USN/WAM; see Table 12.
Table 51. SENSE - data byte 0Ah bit description
Bit Symbol Description
7 to 4 CSA[3:0] alignment of FM stereo channel separation
3 and 2 USS[1:0] USN sensitivity; USN weak signal control equivalent level
voltage/frequency deviation for weak signal processing; see
Figure 24
00 = −0.06 V/kHz
01 = −0.08 V/kHz
10 = −0.12 V/kHz
11 = −0.16 V/kHz
1 and 0 WAS[1:0] WAM sensitivity; WAM weak signal control equivalent level
voltage/V
LEVEL
(peak-to-peak) for weak signal processing; see Figure 24
00 = −7.5
01 = −10
10 = −15
11 = −20
a. MPX signal. b. Level variation.
Fig 24. Weak signal control sensitivity versus MPX signal at 150 kHz (USN) and level variation at 21 kHz (WAM)
001aab831
∆f (kHz)
0
0
I
2
C-bus:
USN = 15
755025
2
1
3
4
V
eq. LEVEL
(V)
0
11 10 01 00
USS
[
1:0
]
001aab538
V
LEVEL
(V)
0 0.60.40.2
2
1
3
4
V
eq. LEVEL
(V)
0
11 10 01 00
WAS
[
1:0
]
I
2
C-bus:
15
0WAM =
