Philips Semiconductors
Product specification
New In Car Entertainment (NICE) car radio
CONTENTS
1
2
3
4
5
6
7
7.1
7.1.1
7.1.2
7.1.3
7.2
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.3.6
7.4
8
9
10
FEATURES
GENERAL DESCRIPTION
ORDERING INFORMATION
QUICK REFERENCE DATA
BLOCK DIAGRAM
PINNING
FUNCTIONAL DESCRIPTION
Oscillators
VCO
Crystal oscillator
PLL
FM signal channel
DAA
FM I/Q mixer
FM keyed AGC
FM IF amplifiers
FM demodulator
AM signal channel
AM tuner including mixer 1 and mixer 2
AM RF AGC and IF2 AGC
AM detector
AM AF or IF2 switch
AM noise detector and blanker
FM and AM level detector
Test mode
LIMITING VALUES
THERMAL CHARACTERISTICS
DC CHARACTERISTICS
11
12
12.1
12.1.1
12.1.2
12.1.3
12.1.4
12.2
12.2.1
12.2.2
12.2.3
12.2.4
12.2.5
12.2.6
12.2.7
12.2.8
13
14
15
15.1
15.2
15.3
15.4
15.5
16
17
18
19
TEA6845AH; TEA6845H
AC CHARACTERISTICS
I
2
C-BUS PROTOCOL
I
2
C-bus specification
Test mode
Data transfer for the TEA6845
I
2
C-bus pull-up resistors
Frequency setting
I
2
C-bus protocol
Data transfer mode and IC address
Write mode: data byte 1
Write mode: data byte 2
Write mode: data byte 3
Write mode: data byte 4
Write mode: data byte 5
Write mode: data byte 6
Read mode: data byte 1
TEST AND APPLICATION INFORMATION
PACKAGE OUTLINES
SOLDERING
Introduction to soldering surface mount
packages
Reflow soldering
Wave soldering
Manual soldering
Suitability of surface mount IC packages for
wave and reflow soldering methods
DATA SHEET STATUS
DEFINITIONS
DISCLAIMERS
PURCHASE OF PHILIPS I
2
C COMPONENTS
2001 Apr 12
2
Philips Semiconductors
Product specification
New In Car Entertainment (NICE) car radio
1
FEATURES
TEA6845AH; TEA6845H
•
FM mixer for conversion of FM RF from 65 to 108 MHz
to IF of 10.7 MHz; the mixer provides inherent image
rejection
•
FM RF mixer can be set to receive weather band radio
up to 162.55 MHz; weather band radio flag output
•
AM mixer 1 for conversion of AM RF to AM IF1 of
10.7 MHz
•
LC tuner oscillator providing mixer frequencies for
FM mixer and AM mixer 1
•
AM mixer 2 for conversion of AM IF1 to AM IF2 of
450 kHz
•
Crystal oscillator providing mixer frequencies for
AM mixer 2 and reference for synthesizer PLL, IF count,
timing for Radio Data System (RDS) update and
reference frequency for car audio signal processor ICs
•
Fast synthesizer PLL tuning system with local control for
inaudible RDS updating
•
Timing function for RDS update algorithm and control
signal output for car audio signal processor ICs
(TEA688x, SAA77xx) or car radio integrated signal
processor IC (TEF6890H)
•
Digital auto alignment circuit for conversion of
LC oscillator tuning voltage to controlled alignment
voltage of FM antenna tank circuit
•
AGC PIN diode drive circuit for FM RF AGC; AGC
detection at FM mixer input; the AGC PIN diode drive
can be activated by the I
2
C-bus as a local or distance
function; AGC threshold is a programmable and keyed
function switchable via the I
2
C-bus
•
FM IF linear amplifiers with high dynamic input range
•
FM quadrature demodulator with automatic centre
frequency adjustment and Total Harmonic Distortion
(THD) compensation
3
ORDERING INFORMATION
TYPE
NUMBER
TEA6845AH
TEA6845H
PACKAGE
NAME
QFP64
QFP64
DESCRIPTION
plastic quad flat package; 64 leads (lead length 1.95 mm);
body 14
×
20
×
2.8 mm
plastic quad flat package; 64 leads (lead length 1.95 mm);
body 14
×
20
×
2.8 mm
VERSION
SOT319-5
SOT319-2
•
Level detector for AM and FM with temperature
compensated output voltage; starting point and slope of
level output is programmable via the I
2
C-bus
•
AM RF PIN diode drive circuit; AGC threshold detection
at AM mixer 1 and IF2 AGC input; threshold is
programmable via the I
2
C-bus; AM IF2 AGC and
demodulator
•
AM AF output switchable to provide AM IF2 for
AM stereo decoder
•
AM noise blanker with blanking at AM IF2
•
Several test modes available for fast IC and system
tests.
2
GENERAL DESCRIPTION
The TEA6845 is a single IC with car radio tuner for
AM and FM intended for microcontroller tuning with the
I
2
C-bus. It provides the following functions:
•
AM double conversion receiver for LW, MW and SW
(31 m, 41 m and 49 m bands) with IF1 = 10.7 MHz and
IF2 = 450 kHz
•
FM single conversion receiver with integrated image
rejection for IF = 10.7 MHz capable of selecting US FM,
US weather, Europe FM, East Europe FM and Japan
FM bands.
2001 Apr 12
3
Philips Semiconductors
Product specification
New In Car Entertainment (NICE) car radio
4
QUICK REFERENCE DATA
SYMBOL
V
DDA(n)
I
DDA(tot)
V
DDA2
I
DDA2
V
DDD
I
DDD
f
AM(ant)
PARAMETER
analog supply voltage 1, 3, 4, 5
and 6
total analog supply current 1, 3, 4, FM mode
5 and 6
AM mode
analog supply voltage 2
analog supply current 2
digital supply voltage
digital supply current
AM input frequency
FM mode
AM mode
LW
MW
SW
f
FM(ant)
f
FM(WB)(ant)
T
amb
(S+N)/N
THD
FM input frequency
FM weather band input frequency
ambient temperature
FM mode
AM mode
CONDITIONS
TEA6845AH; TEA6845H
MIN.
8
45
39
4.75
6.5
4.7
4.75
18
18
0.144
0.522
5.85
65
162.4
−40
TYP.
8.5
56
49
5
8.1
5.9
5
23
23
−
−
−
−
−
−
58
0.3
0.5
MAX.
9
67
59
5.25
9.8
7.1
5.25
28
28
0.288
1.710
9.99
108
162.55
+85
−
−
−
−
1
UNIT
V
mA
mA
V
mA
mA
V
mA
mA
MHz
MHz
MHz
MHz
MHz
°C
dB
%
%
AM overall system parameters (1
×
SFE10.7MS3; 1
×
SFR450H)
signal plus noise-to-noise ratio
total harmonic distortion
m = 0.3
m = 0.8
m = 0.9
FM overall system parameters (3
×
SFE10.7MS3)
(S+N)/N
THD
signal plus noise-to-noise ratio
total harmonic distortion
∆f
= 22.5 kHz;
de-emphasis = 50
µs
∆f
= 75 kHz
−
−
65
0.6
dB
%
−
−
−
2001 Apr 12
4
DSP and ARM Processors
京公网安备 11010802033920号
EEWORLD
