TEA6845H/V2-T NXP Semiconductors, TEA6845H/V2-T Datasheet - Page 9

• Manufacturer Part Number: TEA6845H/V2-T
• Description: Tuners VDO-NICE
• Manufacturer: NXP Semiconductors

Specifications of TEA6845H/V2-T

• Pin Count: 64
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TEA6845H/V2,518

Philips Semiconductors
7
7.1
7.1.1
The L and C tuned VCO provides the local oscillator signal
for both FM and AM mixer 1. It has a frequency range of
151.2 to 248.2 MHz.
7.1.2
The crystal oscillator provides a 20.5 MHz signal that is
used for:
7.1.3
Fast synthesizer PLL tuning system with local control for
inaudible RDS updating.
7.2
7.2.1
FM RF Digital Auto Alignment (DAA) circuitry for the
conversion of the VCO tuning voltage to a controlled
alignment voltage for the FM antenna tank circuit.
7.2.2
FM quadrature mixer converts FM RF (65 to 162.55 MHz)
to IF of 10.7 MHz. The FM mixer provides inherent image
rejection and high RF sensitivity.
It is capable of tuning the US FM, US weather,
Europe FM, Japan FM and East Europe FM bands:
7.2.3
FM contains keyed wide-band RF AGC. AGC detection
occurs at the FM mixer. The wide-band RF signal switches
a narrow band signal (IF) from the FM IF level detector
circuitry that controls the FM RF AGC block.
2001 Apr 12
Reference frequency for frequency synthesizer PLL
Local oscillator for AM mixer 2
Reference frequency for the IF counter
Timing signal for the RDS update algorithm
Reference frequency (75.4 kHz) for the TEA6880H (car
audio signal processor - CASP) or TEF6890H (car radio
integrated signal processor).
US FM = 87.9 to 107.9 MHz
US weather FM = 162.4 to 162.55 MHz
Europe FM = 87.5 to 108 MHz
Japan FM = 76.0 to 91 MHz
East Europe FM = 65.8 to 74 MHz.
New In Car Entertainment (NICE) car radio
FUNCTIONAL DESCRIPTION
Oscillators
FM signal channel
VCO
C
PLL
DAA
FM I/Q
FM
RYSTAL OSCILLATOR
KEYED
MIXER
AGC
9
It includes an AGC PIN diode drive circuit for the FM RF
AGC. The PIN diode drive can be activated via the I
as a local or distance function.
The AGC threshold is programmable and the keyed AGC
function is switchable via the I
7.2.4
The two FM IF amplifiers provide 10 dB and 4 dB
amplification with high linearity and dynamic range.
7.2.5
The FM quadrature demodulator includes automatic
centre frequency adjustment and THD compensation.
7.3
7.3.1
The AM tuner is realized in a double conversion technique
and is capable of selecting LW, MW and SW bands.
AM mixer 1 converts AM RF to IF1 of 10.7 MHz, while
AM mixer 2 converts IF1 of 10.7 MHz to IF2 of 450 kHz:
7.3.2
The AM RF includes a PIN diode drive circuit. The
threshold detection points for AM AGC are performed at
AM mixer 1 and AM IF2. AGC thresholds are
programmable via the I
7.3.3
The AM detector provides AM level information and
AM AF or AM IF2.
7.3.4
The AM output provides either a detected AM AF or the
corresponding AM IF2 signal. The IF2 signal can be used
for AM stereo decoder processing.
LW = 144 to 288 kHz
MW = 530 to 1710 kHz (US AM band)
SW = 5.85 to 9.99 MHz (including the 31 m, 41 m and
49 m bands).
AM signal channel
FM IF
FM
AM
AM RF AGC
AM
AM AF
DEMODULATOR
TUNER INCLUDING MIXER
DETECTOR
AMPLIFIERS
OR
TEA6845AH; TEA6845H
IF2
AND
2
SWITCH
C-bus.
IF2 AGC
2
C-bus.
Product specification
1
AND MIXER
2
2
C-bus