TEF6894H/V3,518 NXP Semiconductors, TEF6894H/V3,518 Datasheet - Page 8

• Manufacturer Part Number: TEF6894H/V3,518
• Description: IC RADIO SIGNAL PROC 44-QFP
• Manufacturer: NXP Semiconductors
• Type: Car Signal Processorr

Specifications of TEF6894H/V3,518

• Package / Case: 44-MQFP, 44-PQFP
• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935282869518; TEF6894H/V3-T; TEF6894H/V3-T

Philips Semiconductors
7
7.1
The FMMPX input is the input for the MPX signal from the
tuner. The input gain can be selected in three settings to
match the input to the RF front-end circuit. A fourth setting
is used for weather band mode, which may require a gain
of 23.5 dB.
A low-pass filter provides the necessary signal delay for
FM noise blanking and suppression of high frequency
interferences into the stereo decoder input. The output
signal of this filter is fed to the roll-off correction circuit. This
circuit compensates the frequency response caused by
the low-pass characteristic of the tuner circuit with its
IF filters. The roll-off correction circuit is adjustable in four
2003 Oct 21
handbook, full pagewidth
DGND
SDA
SCL
ADDR
SYMBOL
Car radio integrated signal processor
FUNCTIONAL DESCRIPTION
Stereo decoder
PIN
41
42
43
44
MPXRDS
AFHOLD
AFSAMP
FMMPX
LEVEL
SDAG
SCLG
FREF
digital ground
I
I
address select input
GND
2
2
C-bus data input or output
C-bus clock input
AM
i.c.
10
11
1
2
3
4
5
6
7
8
9
Fig.2 Pin configuration.
TEF6894H
8
settings to compensate different frequency responses of
the tuner part.
The MPX signal is decoded in the stereo decoder part.
A PLL is used for the regeneration of the 38 kHz
subcarrier. The fully integrated oscillator is adjusted by a
digital auxiliary PLL into the capture range of the main PLL.
The auxiliary PLL needs an external reference frequency
(75.4 kHz) which is provided by the tuner ICs of the NICE
family (TEA684x). The required 19 and 38 kHz signals are
generated by division of the oscillator output signal in a
logic circuit. The 19 kHz quadrature phase signal is fed to
the 19 kHz phase detector, where it is compared with the
incoming pilot tone. The DC output signal of the phase
detector controls the oscillator (PLL).
DESCRIPTION
MHC421
33
32
31
30
29
28
27
26
25
24
23
i.c.
NAV
i.c.
RROUT
LROUT
RFOUT
LFOUT
PHCM
PHONE
TAPEL
TAPER
Product specification
TEF6894H