SGS Thomson Microelectronics TDA7340P Datasheet
AUDIOPROCESSOR:
MUTE, SOFT MUTE AND ZERO CROSSING
MUTE
ONE DIFFERENTIAL, TWO STEREO AND
TWO MONO INPUTS
DIFFERENTIAL PHONEINPUT
VOLUME, BASS, TREBLE AND LOUDNESS
CONTROL
FOUR SPEAKER ATTENUATORS WITH IN-
DEPENDENTATTENUATION CONTROL
STEREODECODER:
ADJUSTMENT FREE INTEGRATED 456KHz
VCO
HIGHCUTCONTROL
STEREOBLEND
NOISE BLANKER:
INTEGRATEDHIGH-PASSFILTER
NOISE RECTIFIER OUTPUT FOR QUALITY
DETECTION
PROGRAMMABLETRIGGERTHRESHOLD
PAUSE DETECTOR:
PROGRAMMABLETHRESHOLD
2
ALLFUNCTIONS PROGRAMMABLEVIA I
DESCRIPTION
The TDA7340 I
processor contains all signal processing blocks of
a high performance car radio, including audioprocessor, stereodecoder, noise blanker, pause
2
C bus controlled audio signal
CBUS
TDA7340
AUDIO SIGNAL PROCESSOR
PQFP44
ORDERING NUMBER: TDA7340P
detectorand differentmute functions.
The use of BICMOS technologyallows the implementation of several filter functions with switched
capacitor techniques like fully integrated, adjustment free PLL Loop filter, pilot detector with integratorand two 19KHznotch filters.
This minimizes the number of external components.
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
bipolar multipliers, very low distortion and very
low noise are obtained also in the stereodecoder
part. The audioprocessor contains several new
features like softmute, zero-crossing mute and
pausedetector.
Very low Dc stepping is obtained by use of a
BICMOStechnology.
September 1999
1/16
TDA7340
AUDIO PROCESSORPART
FEATURES:
Input Multiplexer:
DIFFERENTIAL CD STEREOINPUT
CASSETTESTEREO INPUT
FM STEREO INPUT FROM STEREODE-
CODER
AM INPUT:
MONO OR STEREO MODE (PROGRAMMABLE)
BEEP INPUT (ONLY IN AM MONO MODE)
TELEPHONEDIFFERENTIALMONOINPUT
GAIN PROGRAMMABLE IN 3 x 3.75dB
STEPS
Loudness:
FULLY PROGRAMMABLE
15 x 1.25dB STEPS
Volume Control:
1.25dBCOARSE ATTENUATOR
0.31dBFINE ATTENUATORS
MAX GAIN 20dB
MAX ATTENUATION 59.7dB (PLUS LOUD-
NESS)
Bass Control
±7 x 2dB STEPS
2nd ORDER SYMMETRICAL OR NON SYM-
METRICAL FREQUENCYRESPONSE
(PROGRAMMABLE)
Treble Control
±7 x 2dB STEPS
Speaker Control
4 INDEPENDENT SPEAKER CONTROL IN
1.25dB STEPS
CONTROLRANGE 37.5dB
INDEPENDENT SPEAKERMUTE
Mute Functions
DIRECTMUTE
ZERO CROSSING MUTE WITH PROGRAMMABLETHRESHOLD
SOFT MUTE WITH EXTERNAL DEFINED
SLOPE
Pause Detector
PROGRAMMABLETHRESHOLD
DELAY TIME DEFINED BY AN EXTERNAL
CAPACITOR
STEREODECODERPART
FEATURES:
INTEGRATED 19KHZ NOTCH FILTER FOR
PILOTCANCELLATION
ON CHIP FILTER FOR PILOT DETECTOR
ANDPLL
ADJUSTMENT FREE VOLTAGE CONTROLLED OSCILLATOR
AUTOMATIC PILOT DEPENDENT
MONO/STEREOSWITCHING
VERY HIGH INTERMODULATION AND INTERFERENCE SUPPRESSION
2
C BUS CONTROLLED (STD OFF, FORCED
I
MONO,STEREO)
HIGHCUT CONTROL
STEREOBLEND
NOISE BLANKER PART
FEATURES:
INTERNAL2nd ORDER HIGH-PASSFILTER
NOISE RECTIFIER OUTPUT FOR SIGNAL
QUALITYDETECTION
PROGRAMMABLETRIGGERTHRESHOLD
TRIGGER THRESHOLD DEPENDENT ON
HIGHFREQUENCY NOISE
BLANKING TIME PROGRAMMABLE BY EX-
TERNALCAPACITOR
VERY LOW OFFSET CURRENT DURING
HOLD TIME DUE TO OPAMPS WITH MOS
INPUTS
LEVEL INPUT FOR ADDITIONAL SPIKE DETECTIONON FIELD STRENGTH
2/16
BLOCK DIAGRAM
TDA7340
6.2K
6.2K
1nF
OUT LR
OUT LF
OUT RR
OUT RF
SCL
SDA
DIGGND
OUT LF
OUT LR
OUT RR
OUT RF
C12
2.7nF
C11
2.7nF
C7 C8 C9 C10
C6
47nF
C5
47nF
BOUT R TR L TR R
BIN R
BOUT L
BIN L
R2
4x
100nF
R1
TREBLE
BASS
SOFT
MUTE
C BUS
2
I
HC L
HIGH
C13
CUT
NOISE
25KHz
1nF
HC R
CONTROL
BLANKER
19KHz
NOTCH
LP
C14
LEVEL
CONTROL
PULSE
PEAK
DETECTOR
FORMER
D93AU046B
68K
VSB VR VHCC
470pF
47nF
R5
C17
C16
47K
47K
R6
R4
R3
100K
reflevel level
(*)(**) NETWORK TO BE ADAPTED TO THE SPECIFIC REQUESTS FOR STEREO BLEND AND HIGH CUT CONTROL
VOLUME +
LOUDNESS
C4
47nF
LOUD L LOUD R CSM
VCO
PLL
456KHz
DEMODULATOR
LP
80KHz
MPX
IN L
IN R
C3
CD
1µF
OUT L
OUT R
4x
CD L+ CD R+
4.7µF
1µFC2
MUTE
PAUSE
FM L
FM R
MUX
AM_L
AM_R
(BEEP)
CASS L
CASS R
(AM MONO)
6x
1µF
PHONE IN
PHONE GND
HP
LEVEL PEAK TBLANK
field strength
C15
47nF
TDA7340
SUPPLY
1µF
C1
CREF PAUSE
GND
VDD
3/16
TDA7340
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
amb Operating Temperature Range -40 to 85 °C
T
stg Storage Temperature Range -55 to 150 °C
T
PIN CONNECTION
Operating Supply Voltage 10.5 V
IN R
OUT R
BIN R
BOUT R
BOUT L
BIN L
AM_L (BEEP)
AM_R (AM MONO)
CASS L
CASS R
TR R
44 43 42 41 3940 38 37 36 35 34
OUT L
IN L
CREF
LOUD L
LOUD R
GND
DIGGND
VDD
CSM
SCL
SDA
1
2
3
4
5
6
7
8
9
10
12 13 14 15 16
VCO
PAUSE
PEAK
TBLANK
TDA7340P
(PQFP44)
LEVEL
171118 19 20 21 22
HCL
VSB
HCR
33
TR L
32
CD L+
31
CD L-
30
CD R-
29
CD R+
28
PHON IN
27
PHON GND
26
OUT LF
25
OUT RF
24
OUT LR
23
OUT RR
VR
D94AU055A
MPX
VHCC
THERMAL DATA
Symbol Parameter Value Unit
th j-pins Thermal ResistanceJunction-pins max 85 °C/W
R
ELECTRICALCHARACTERISTICS (VS =9V; Tamb =25°C; RL = 10KΩ; all gains = 0dB;f = 1KHz;
unless otherwisespecified, refer to the Test Circuit.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY
V
S
I
S
SVR Ripple Rejection Audioprocessor 90 dB
Supply Voltage 6 9 10 V
Supply Current Stereo Decoder= ON 10 20 25 mA
Stereo Decoder= OFF 5 12.5 20 mA
StereoDecoder + Audioprocessor 55 dB
INPUT SECTION
RI Input Resistance 70 100 130 KΩ
V
CL
S
R
G
I MIN Minimum Input Gain -0.75 0 0.75 dB
G
I MAX
G
STEP
e
IN Input Noise Single Ended Input 2.3 µV
V
DC
Clipping Level d ≤ 0.3% 2.1 2.6 Vrms
Input Separation 80 100 dB
I
Output Load Resistance 2 K
L
Max Input Gain 10.25 11.25 12.25 dB
Step Resolution 2.75 3.75 4.75 dB
Dc Steps Adjacent Gain Step 2 10 mV
G
MIN
to G
MAX
3mV
Ω
4/16
TDA7340
ELECTRICALCHARACTERISTICS (continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
DIFFERENTIAL CD STEREO INPUT
RI Input Resistance Input selector BIT D6 = 0 (0dB) 10 15 20 KΩ
Input selector BIT D6 = 1(-6dB) 14 20 30 KΩ
CMRR Common Mode Rejection Ratio V
d Distortion V
e
IN
DIFF Differential Gain D6 = 0 -1 0 1 dB
G
Input Noise 20Hz to 20KHz; Flat; D6 = 0 5
DIFFERENTIAL TELEPHONE MONO INPUT
R
CMRR Common Mode Rejection Ratio V
d Distortion V
e
IN
G
DIFF
Input Resistance 14 20 26 KΩ
I
Input Noise 20Hz to 3 KHz; Flat 10 µV
Differential Gain -4.75 -3.75 -2.75 dB
VOLUME CONTROL
R
C
MAX
A
MAX
A
STEPC
A
STEPF Step Resolution Fine
E
A Attenuation Set Error G = -20 to 20dB -1.25 0 1.25 dB
E
T
DC DC Steps Adjacent Attenuation Steps -3 0.1 3 mV
V
Input Resistance (INR, INL) 24 35 46 K
I
Max Gain 18.75 20 21.25 dB
Max Attenuation 57.7 59.7 62.7 dB
Step Resolution Coarse
Attenuation
Attenuation
Tracking Error 2dB
LOUDNESSCONTROL (LOUDL,LOUDR)
A
A
R
STEP
MAX
Internal Resistance 35 50 65 KΩ
I
Step Resolution 0.5 1.25 2.0 dB
Max Attenuation 17.5 18.75 20.0 dB
ZERO CROSSING MUTE
VTH Zero Crossing Threshold (1) WIN = 11 20 mV
A
MUTE
V
DC
Mute Attenuation 80 100 dB
DC Step 0dB to Mute 0.3 3 mV
SOFTMUTE
A
MUTE
t
D
(1) WIN represents the MUTE programming bit pair D6,D5 for the zero crossing window threshold
Mute Attenuation 45 60 dB
Delay Time C
CM
=1V
I
=1V
; f = 1KHz
RMS
RMS
f = 10KHz
48 75 dB
45 70 dB
0.01 0.08 %
D6 = 1 -7 -6 -5 dB
=1V
CM
I =1VRMS 0.15 0.5 %
; f = 1KHz 45 60 dB
RMS
0.50 1.25 2.00 dB
0.11 0.31 0.51 dB
G = -20 to -59.7dB 3 2 dB
from 0dB to A
MAX
0.5 5 mV
WIN = 10 40 mV
WIN = 01 80 mV
WIN = 00 160 mV
= 22nF; I = I
EXT
0 to -20dB; I = IMIN
0.8 1.5 2.0 ms
MAX
15 25 45 ms
V
µ
Ω
5/16
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