Page 1
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
Page 2
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
Page 3
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
Page 4
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
Page 5
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
Page 6
TDA7340
ELECTRICALCHARACTERISTICS (continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
BASS CONTROL
C
RANGE
A
STEP
B Internal Feedback Resistance 35 50 65 KΩ
R
TREBLE CONTROL
C
RANGE
STEP Step Resolution 1 2 3 dB
A
SPEAKERATTENUATORS
CRANGE Control Range 35.0 37.5 40.0 dB
A
STEP
A
MUTE
E
A
V
DC
AUDIO OUTPUTS
VCLIP Clipping Level d = 0.3% 2.1 2.6 VRMS
R
L
R
OUT
V
DC
Control Range
±
11.5
14
±
16 dB
±
Step Resolution 1 2 3 dB
Control Range ±13 ±14 ±15 dB
Step Resolution 0.5 1.25 2.0 dB
Output Mute Attenuation Data Word = 38.75dB 80 100 dB
Attenuation Set Error 1.50 dB
DC Step Adjacent Attenuation Steps 0.1 3 mV
Output Load Resistance 2 KΩ
Output Impedance 30 100
DC Voltage Level 3.5 3.8 4.1 V
Ω
PAUSE DETECTOR
V
I
DELAY
V
THP
TH
Zero Crossing Threshold(1) WIN = 11 20 mV
WIN = 10 40 mV
WIN = 01 80 mV
WIN = 00 160 mV
Pull-up Current 15 25 35
Pause Threshold 3.0 V
GENERAL
E
NO
S/N Signal to Noise Ratio All gains 0dB;V
d Distortion V
S
C
E
T
Output Noise BW = 20Hz to 20KHz, flat
Output Muted
All gains =0dB
=1V
I
=1V
O
; 0.01 0.08 %
RMS
; 106 dB
RMS
Channel Separation Left/Right 80 100 dB
Total Tracking Error AV = 0to -20dB; 0 1 dB
= -20 to -60dB; 0 2 dB
A
V
BUS INPUT
V
IL
V
IH
I
IN
V
O
(1) WIN represent the MUTE programming bit paIr D6,D5 for the zero crossing window threshold
Input Low Voltage 1V
Input High Voltage 3 V
Input Current VIN= 0.4V -5 5 µA
Output Voltage SDA
IO= 1.6mA 0.4 0.8 V
Acknowledge
2.5
515
A
µ
µV
µV
6/16
Page 7
TDA7340
STEREO DECODER PART
ELECTRICALCHARACTERISTICS (V
T=50µs;nominal MPX input voltage: V
less otherwisespecified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
MPX Input Level 0.5 1.25 V
Input Resistance 35 50 65 K
Minimum Input Gain 2.5 3.5 4.5 dB
Maximum InputGain 9.5 11 12.5 dB
Step Resolution 1.75 2.5 3.25 dB
G
R
G
G
V
IN
IN
MIN
MAX
STEP
SVRR Supply Voltage RippleRejection V
V
O
DC Output Voltage (HCL, HCR) 4.2 4.5 4.8 V
α Channel Separation V
THD Total Harmonic distortion 0.02 0.2 %
S+N
Signal plus noise to noise ratio f = 200Hz to 16KHz; S = 2V
N
CARRIER AND HARMONIC SUPPRESSIONAT THE OUTPUT
α19 Pilot Signal f = 19KHz 55 75 dB
38 Subcarrier f = 38KHz 75 dB
α
α57 Subcarrier f = 57KHz 62 dB
76 Subcarrier f = 76KHz 90 dB
α
= 9V; modulation frequency:1KHz;de-emphasis time:
S
MPX
= 0.5V
RIPPLE
SB-VR
(75KHzdeviation); GI = 3.5dB;T
RMS
amb
= 100mV; f = 1KHz 50 60 dB
= 100m
VDC
RMS
50 dB
91 dB
=27°C; un-
RMS
Ω
INTERMODULATION (note 1)
α2f
α3f
= 10KHz; f
mod
= 13KHz; f
mod
= 1KHz 65 dB
spur
= 1KHz 75 dB
spur
TRAFFICRADIO (note 2)
α57 Signal f = 57KHz 70 dB
SCA - SUBSIDIARY COMMUNICATIONS AUTHORIZATION (note 3)
α67 Signal f = 67KHz 75 dB
ACI - ADJACENT CHANNEL INTERFERENCE (note4)
114 Signal f = 114KHz 95 dB
α
α190 Signal f = 190KHz 84 dB
MONO/STEREO SWITCH
V
V
INTH
INTH
Pilot Threshold Voltage for stereo ”ON” Pth=1
P
=0
th
Pilot Threshold Voltage for stereo ”OFF” Pth =1
P
=0
th
11
18
13
15
2234mV
25
6
12
1825mV
19
STEREO BLEND
V
SB-VR
V
SB-VR
Control Voltage for Channel
Separation
Control Voltage for Channel
Separation
α = 6dB; VR= 3.6V (note5) -0.31 -0.26 -0.23 V
= 26dB; -50 mV
α
HIGH CUT CONTROL
τ
deemp
R
R
HCC
HCC
De-Emphasis Time Constant C13,C14=1nF;V
High Cut Control Resistance V
High Cut Control Resistance V
=100mV 50 KΩ
HCC-VR
=-1.3V(note 6) 115 150 185 KΩ
HCC-VR
= 100mV 50 µs
HCC-VR
VCO
f
OSC
∆f/f Capture and Holding Range 1
Oscillator Frequency 456
mV
mV
RMS
RMS
RMS
RMS
7/16
Page 8
TDA7340
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
NOISE INTERFERENCE DETECTOR
V
TR
V
RECT
T
S
I
OS
(1) NTB represent the STDEC programming bit pair D6,D5 for the noise blanker trigger threshold
NOTES TO THE CHARACTERISTICS
1 INTERMODULATIONSUPPRESSION
α2 =
V
Trigger Threshold (1)
(see pulse slope fig 3)
Rectifier Voltage V
Suppression Pulse Duration C
Input Offset Current During
Suppression Time
V
(signal)(at1KHz)
O
(spurious)(at1KHZ)
O
;f
meas. with
V
= 1.2V
RECT
meas. with
V
= 1.4V
RECT
= 0mV 0.5 0.9 1.3 V
MPXIN
= 50mV;f =150KHz 1.5 V
V
MPXIN
V
= 100mV; f= 150KHz 2.0 2.5 3.0 V
MPXIN
BLANK
= (2 x 10KHz) - 19KHz
s
NTB = 00 100 mV
NTB = 10 130 mV
NTB = 11 170 mV
NTB = 00 150 mV
NTB = 10 200 mV
NTB = 11 250 mV
= 470pF 40
10 pA
P
P
P
P
P
P
s
µ
V
(signal)(at1KHz)
α3=
O
(spurious)(at1KHZ)
V
O
;f
= (3 x 13KHz) - 38KHz
s
measuredwith : 91% mono signal; 9% pilot signal; fm=10KHzor 13KHz
2. TRAFFICRADIO (V.F.) suppression
α57(
V.W.F.
V
)
=
VO(spurious) (at1KHZ ±23Hz)
O(signal)
(at1KHz)
measuredwith : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier
(f=57KHz,fm = 23HzAM,m = 60%)
3. SCA(SUBSIDIARYCOMMUNICATIONS AUTHORIZATION)
α67
V
O(signal)
=
V
(spurious)(at9KHZ)
O
(at
1KHz
)
;f
= (2 x 38KHz)- 67KHz
s
measuredwith : 81% mono signal; 9% pilot signal; fm=1KHz;
10% SCA- subcarrier(f
= 67KHz, unmodulated)
s
4. ACI(ADJACENTCHANNEL INTERFERENCE)
α114 =
α
190
(
V
signal
O
V
(spurious)(at4KHZ)
O
(signal) (at1KHz)
V
O
=
(
spurious)(at4KHZ
V
O
) (
at1KHz
)
;f
= 110KHz- (3x 38KHz)
s
;f
= 186KHz- (5x 38KHz)
s
)
measuredwith : 90% mono signal; 9% pilot signal; fm=1KHz;1% spurioussignal
(f
= 110KHzor 186KHz, unmodulated)
s
8/16
Page 9
NOTES TO THE CHARACTERISTICS (continued)
5. Controlrange typ 11% of V
6. Controlrange typ 30% of V
R
(see figure 2)
R
(see figure 1)
TDA7340
Figure 1: High Cut Control
Figure 3
V
MPX
V
TH
DC-LEVEL
Figure2: StereoBlend
SEP
(dB)
50
VR=3.6V
40
30
20
10
0
-0.4 -0.3 -0.2 -0.1 VSB-VR(V)
(*) All thresholds are measured by using a pulse with TR=2µs,
=2µs and TF=10µs.
T
HIGH
The repetition rate must not increase the PEAK voltage.
D94AU056
D94AU185
2
C BUS INTERFACE
I
TRT
HIGH
T
F
Time
Interface Protocol
The interfaceprotocol comprises:
A start condition (s)
A chip address byte, (theLSB bit determines
read/writetransmission).
CHIP ADDRESS
MSB LSB MSB LSB MSB LSB
S1000100R/W ACK I ACK DATA ACK P
D95AU216
SUBADDRESS DATA 1 ... DATA n
XXT A3A2A1A
A subaddressbyte
A sequenceof data (N-bytes + acknowledge)
A stop condition (P)
0
ACK = Acknowledge
S = Start
P = Stop
I = Autoincrement
MAX CLOCK SPEED500kbits/s
Autoincrement
If bit I in the subaddressbyte is setto ”1”, the autoincrementof subaddressis enabled.
9/16
Page 10
TDA7340
SUBADDRESS (RECEIVEMODE)
MSB LSB
XXT IA
0000Input Selector
0001Loudness
0010Volume
0011Bass, Treble
0100Speaker Attenuator LF
0101Speaker Attenuator LR
0110Speaker Attenuator RF
0111Speaker Attenuator RR
1000Mute
1001Stereodecoder
3
A
T = Testmode I = Autoincrement X = Not Used
2
A
1
A
0
FUNCTION
TRANSMITTED DATA (SENDMODE)
ST = Stereo(HIGH = active)
X = Not used
MSB LSB
X X X X ST SM ZM P
P = Pause(low active)
ZM =Zero CrossingMuted (HIGH = active)
The transmitted data is automaticallyupdated after each 9th clock pulse.
Transmission can be repeated without new chipaddress.
SM = Soft muteactivated(HIGH = active)
DATA BYTE SPECIFICATION
X = notrelevant; set to ”1”duringtesting
INPUT SELECTOR
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 Quasi Diff CD
1 0 0 0 Full Diff CD
0 0 1 Stereo Decoder
0 1 0 Cassette Stereo
1 0 1 1 AM Mono
1 0 0 Telephone Mono
1 1 0 1 Beep Mono
0 0 1 1 AM Stereo
0 1 0 1 Not allowed
1 1 0 Not allowed
1 1 1 Not allowed
0 0 11.25dB gain
0 1 7.5dB Gain
1 0 3.75dB Gain
1 1 0 dB Gain
0 0dB Differentialinput Gain (CD Input)
1 -6dB Differential input Gain (CDInput)
FUNCTION
For example to select quasi diff CD input with 0dB diff gain and 7.5dB input gain the Data Byte is:
00001000
10/16
Page 11
TDA7340
LOUDNESS
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
XXX000000dB
XXX00001-1.25dB
XXX00010-2.5dB
XXX00011-3.75dB
XXX00100-5dB
XXX00101-6.25dB
XXX00110-7.5dB
XXX00111-8.75dB
XXX01000-10dB
XXX01001-11.25dB
XXX01010-12.5dB
XXX01011-13.75dB
XXX01100-15dB
XXX01101-16.25dB
XXX01110-17.5dB
XXX01111-18.75dB
XXX1D
3
D
2
D
1
D
loudness OFF (1)
0
For example to select -17.5dB loudnessthe Data Byte is: XXX01110
Note (1):
If the loudness is switched OFF, the loudness stage is acting like a volume attenuator with flatfrequency response. D0 to D3 determine the
attenuation level.
LOUDNESS
MUTE
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
1 Soft Mute On
0 1 Soft Mute withfast slope (I = I
1 1 Soft Mute withslow slope (I = I
1 Direct Mute
0 1 Zero CrossingMute ON
0 0 ZC Mute OFF(delayed until next zero crossing)
1 Zero Crossing Mute and Pause Detector Reset
0 0 160mV ZC Window Threshold(WIN = 00)
0 1 80mV ZC WindowThreshold (WIN = 01)
1 0 40mV ZC WindowThreshold (WIN = 10)
1 1 20mV ZC WindowThreshold (WIN = 11)
0 Nonsymmetrical BassCut
1 Symmetrical Bass Cut
An additionaldirect mute functionis included in the Speaker Attenuators
FUNCTION
MAX
MIN
)
)
11/16
Page 12
TDA7340
SPEAKERATTENUATORS
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
111 0000dB
1 1 1 0 0 1 -1.25dB
1 1 1 0 1 0 -2.5dB
1 1 1 0 1 1 -3.75dB
1 1 1 1 0 0 -5dB
1 1 1 1 0 1 -6.25dB
1 1 1 1 1 0 -7.5dB
1 1 1 1 1 1 -8.75dB
11100 0dB
11101 -10dB
11110 -20dB
11111 -30dB
11111111Speaker Mute
For example an attenuationof 25dBon a selected output is given by: 11110100
SPEAKER ATTENUATORS LF, LR, RF, RR
-1.25dB STEPS
10dB STEPS
STEREO DECODER
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0 0 11dB Input Gain
0 1 8.5dB InputGain
1 0 6dB Input Gain
1 1 3.5dB InputGain
1 Stereo Decoder Muted
1 Stereo Decoder Off
1 Forced Mono
0 0 Noise Blanker Threshold 1 (NTB = 00)
1 0 Noise Blanker Threshold 2 (NTB = 10)
1 1 Noise Blanker Threshold 3 (NTB = 11)
0 Pilot Threshold High (P
1 Pilot Threshold Low (P
FUNCTION
=0)
th
=1)
th
For example pilot threshold low, noise blanker threshold 2 (NTB = 10), Stereo decoder ON, 6dB input
gain is given by: 11000010.
12/16
Page 13
BASS/TREBLE
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
TREBLE STEPS
0000-14dB
0001-12dB
0010-10dB
0011-8dB
0100-6dB
0101-4dB
0110-2dB
01110dB
11110dB
11102dB
11014dB
11006dB
10118dB
101010dB
100112dB
100014dB
BASS STEPS
0000 -14dB
0001 -12dB
0010 -10dB
0011 -8dB
0100 -6dB
0101 -4dB
0110 -2dB
0111 0dB
1111 0dB
1110 2dB
1101 4dB
1100 6dB
1011 8dB
1010 10dB
1001 12dB
1000 14dB
FUNCTION
For example12dBTREBLE and -8dB BASSgive the followingData Byte : 00111001
TDA7340
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TDA7340
VOLUME
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0.31dB FINE ATTENUATION STEPS
000
0 1 -0.31dB
1 0 -0.62dB
1 1 -0.94dB
1.25dB COARSE ATTENUATION STEPS
000 0dB
0 0 1 -1.25dB
0 1 0 -2.5dB
0 1 1 -3.75dB
1 0 0 -5dB
1 0 1 -6.25dB
1 1 0 -7.5dB
1 1 1 -8.75dB
10dB GAIN ATTENUATION STEPS
0 0 0 20dB
0 0 1 10dB
010 0dB
0 1 1 -10dB
1 0 0 -20dB
1 0 1 -30dB
1 1 0 -40dB
1 1 1 -50dB
For example to select -47.81dB Volume the DataByte is: 11011001
FUNCTION
STATUSAFTER POWER ON RESET
VOLUME -59.69dB
BASS, TREBLE Treble = +2dB, Bass = 0dB, symmetrical
SPKRS LF, RF, LR, RR -37.5dB
LOUDNESS OFF, -17.5dB
INPUT No input selected,GAIN = 0dB, DIFF CD GAIN = -06dB, FULLY DIFF MODE
STEREODEC OFF, FORCED MONO, 6dB GAIN, PILOT THRESHOLD LOW,NOISE BLANKER =11
MUTE DIRECTLY MUTED, SOFT OFF, ZEROCROSS RESET, WINDOW THRESHOLD =11
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TDA7340
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 2.45 0.096
A1 0.25
0.010
A2 1.95 2.00 2.10 0.077 0.079 0.083
B 0.30 0.45 0.012 0.018
c 0.13 0.23 0.005 0.009
D 12.95 13.20 13.45 0.51 0.52 0.53
D1 9.90 10.00 10.10 0.390 0.394 0.398
D3 8.00 0.315
e 0.80 0.031
E 12.95 13.20 13.45 0.510 0.520 0.530
E1 9.90 10.00 10.10 0.390 0.394 0.398
E3 8.00 0.315
L 0.65 0.80 0.95 0.026 0.031 0.037
L1 1.60 0.063
K0°(min.),7°(max.)
OUTLINE AND
MECHANICAL DATA
PQFP44 (10 x 10)
D
D1
A1
2333
11
PQFP44
22
L1
E
L
E3D3E1
12
0.10mm
.004
Seating Plane
B
K
34
B
44
1
e
A
A2
C
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TDA7340
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specificationmentioned in this publication are
subject to change without notice. This publicationsupersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
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