SGS Thomson Microelectronics TDA7400 Datasheet
ADVANCED CAR SIGNAL PROCESSOR
FULLY INTEGRATED SIGNAL PROCESSOR
OPTIMIZED FOR CAR RADIO APPLICATIONS
FULLY PROGRAMMABLEBY I
INCLUDES AUDIOPROCESSOR, STEREO -
DECODER WITH NOISE BLANKER AND
MULTIPATHDETECTOR
PROGRAMMABLE ROLL-OFF COMPENSATION
NO EXTERNALCOMPONENTS
DESCRIPTION
The TDA7400D is the newcomer of the CSPfamily introduced by TDA7460/61. It uses the same
innovative concepts and design technologies allowing fully software programmability through I
bus and overall cost optimisation for the system
designer.
The device includes an audioprocessor with configurable inputs and absence of external components for filter settings, a last generation
stereodecoder with multipath detector and a so-
2
C BUS
2
C
TDA7400
TQFP44
ORDERING NUMBER: TDA7400
phisticated stereoblend and noise cancellation
circuitry.
Strength pointsof the CSP approachare flexibility
and overall cost/room saving in the application,
combined withhigh performances.
AUDIO PROCESSOR PART
BLOCK DIAGRAM
CDL CDGND CDR
531
CDLOUT
TAPE R
TAPE L
PH+
PH-
MPX
V
2
4
INPUT
10
AM
MULTIPLEXER
+
44
AUTO ZERO
43
8
7
12
27
V
S
41
REF
MUXR
MUXL
FM_R
FM_L
80KHz
LP
SUPPLY
26 42 15 16 14
CREF MPIN
GND
CDROUT
SMUTE
PIL
DET
SOFT
MUTE
DEMODULATOR
+ STEREO
+ STEREO BLEND
VOLUME BASSTREBLE
PILOT
CANCELLATION
PLL
ACOUTL
ACOUTR
DIGITAL CONTROL
ADJUST
MULTIPATH-
DETECTOR
MPOUT LEVEL
25KHz
LP
NOISE
BLANKER
ACINRF
S&H
PULSE
FORMER
ACINRR
3839353422
ACINLF
HIGH
CUT
CONTROL
D
A
ACINLR
3740
OUT LR
OUT LF
OUT RR
OUT RF
I2C BUS
QUAL.
30
32
29
31
23
24
19
18
21
D98AU852B
OUT LR
OUT LF
OUT RR
OUT RF
SCL
SDA
MUX R
MUX L
QUAL
July 1999
1/28
TDA7400
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
amb Operating Ambient Temperature Range -40 to 85 °C
T
stg Operating Storage Temperature Range -55 to 150 °C
T
SUPPLY
Symbol Parameter Test Condition Min. Typ. Max. Unit
S Supply Voltage 7.5 9 10 V
V
S Supply Current V
I
SVRR Ripple Rejection @ 1KHz Audioprocessor (all filtersflat) 50 60 dB
ESD
All pins are protectedagainst ESD accordingto the MIL883standard.
PIN CONNECTION
Operating Supply Voltage 10.5 V
=9V 253035mA
S
Stereodecoder + Audioprocessor 45 55 dB
THERMAL DATA
CDR
CDROUT
CDG
CDLOUT
CDL
N.C.
PHONE-
PHONE+
N.C.
AM
N.C.
REF
ACINRF
ACINLF
ACINRR
N.C.
MUXL
ACINLR
MUXR
TAPE R
TAPE L
CREF
V
44 43 42 41 3940 38 37 36 35 34
1
2
3
4
5
6
7
8
9
10
12 13 14 15 16
N.C.
MPX
LEVEL
171118 19 20 21 22
MPIN
MPOUT
N.C.
N.C.
ACOUTL
ACOUTR
QUAL
SMUTE
33
32
31
30
29
28
27
26
25
24
23
D98AU853
N.C.
OUT LF
OUT RF
OUT LR
OUT RR
N.C.
V
S
GND
N.C.
SDA
SCL
Symbol Parameter Value Unit
th-j pins Thermal ResistanceJunction-pins Max 65 °C/W
R
2/28
TDA7400
PIN DESCRIPTION
N. Name Function Type
1 VREF Reference Voltage Output I
2 CREF Reference Capacitor Pin S
3 TAPEL Tape InputLeft I
4 TAPER Tape InputRight I
5 CDR CD Right Channel Input I
6 CDGND CD Input Common Ground I
7 CDL CD Input Left Channel I
8 PH - Differential Phone Input - I
9 PH + Differential Phone Input + I
10 AM AM Input I
11 MPX FM Stereodecoder Input I
12 LEVEL Level InputStereodecoder I
13 MPIN Multipath Input I
14 MPOUT Multipath Output O
15 MUXL Multiplexer Output Left Channel O
16 MUXR Multiplexer Output Right Channel O
17 QUAL Stereodecoder Quality Output O
18 SMUTE Soft Mute Drive I
19 SCL I
20 SDA I
21 GND Supply Ground S
22 VS Supply Voltage S
23 OUTRR Right Rear Speaker Output O
24 OUTLR Left Rear Speaker Output O
25 OUTRF Right Front Spaeaker Output O
26 OUTLF Left FrontSpeaker Output O
27 ACOUTR Pre-speaker AC Output RightChannel O
28 ACOUTL Pre-speaker AC Output Left Channel O
Pin typelegenda: I = Input O = OutputI/O = Input/Output S = Supply nc = not connected
2
C Clock Line I
2
C Data Line I/O
3/28
TDA7400
Input Multiplexer
Quasi-differentialCD and cassettestereoinput
AM monoinput
Phonedifferentialinput
Multiplexer signal after In-Gain available at
separatepins
Treble Control
2nd order frequencyresponse
Center frequencyprogrammablein 4 steps
±15 x 1dB steps
Volume control
1dB attenuator
Max. gain15dB
Max. attenuation79dB
Bass Control
2nd order frequencyresponse
Centerfrequencyprogrammablein 4(5) steps
DC gain programmable
±15 x 1dB steps
Speaker Control
4 independentspeaker controls in 1dB steps
max gain 15dB
max. attenuation79dB
Mute Functions
Direct mute
Digitally controlled softmute with 4 programmable
mute time
DESCRIPTIONOF THE AUDIOPROCESSOR
PART
ELECTRICALCHARACTERISTICS (V
S = 9V;Tamb =25°C; RL = 10KΩ;all gains= 0dB;f= 1KHz;
unless otherwisespecified).
Symbol Parameter Test Condition Min. Typ. Max. Unit
INPUTSELECTOR
R
in
V
CL
S
IN
IN MIN Min. Input Gain -1 0 1 dB
G
IN MAX Max. Input Gain 13 15 17 dB
G
G
STEP
V
DC
Input Resistance all inputs exceptPhone 70 100 130 K
Clipping Level 2.2 2.6 V
Input Separation 80 100 dB
Step Resolution 0.5 1 1.5 dB
DC Steps AdjacentGain Step -5 0.5 5 mV
to G
G
MIN
MAX
-10 5 10 mV
Ω
RMS
DIFFERENTIAL CD STEREOINPUT
Rin Input Resistance Differential 70 100 130 KΩ
Common Mode 70 100 130 K
CMRR Common Mode Rejection Ratio V
e
N
Output Noise @ Speaker
Outputs
CM=1VRMS
V
CM=1VRMS
20Hz to 20KHz flat; all stages
0dB
@ 1KHz 45 70 dB
@ 10KHz 45 60 dB
615
DIFFERENTIAL PHONEINPUT
R
in
CMRR Common Mode Rejection Ratio V
4/28
Input Resistance Differential 40 56 K
CM=1VRMS
V
CM=1VRMS
@ 1KHz 40 70 dB
@ 10KHz 40 60 dB
Ω
V
µ
Ω
TDA7400
ELECTRICALCHARACTERISTICS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
VOLUMECONTROL
GMAX Max Gain 13 15 17 dB
MAX Max Attenuation 70 79 dB
A
A
STEP
E
A
Step Resolution 0.5 1 1.5 dB
Attenuation Set Error G = -20 to20dB -1.25 0 1.25 dB
G = -60 to 20dB -4 0 3 dB
E
T
V
DC
Tracking Error 2dB
DC Steps AdjacentAttenuation Steps 0.1 3 mV
From 0dB to G
MIN
0.5 5 mV
SOFTMUTE
AMUTE Mute Attenuation 80 100 dB
D Delay Time T1 0.48 1 ms
T
T2 0.96 2 ms
T3 20 40.4 60 ms
T4 200 324 600 ms
V
THlow
V
THhigh
R
PD
Low Threshold for SM Pin
High Threshold for SM Pin 2.5 V
Internal Pull-upResistor 70 100 130 K
1
1V
BASSCONTROL
CRANGE Control Range ±13 ±15 ±17 dB
A
STEP
f
C
Q
BASS Quality Factor Q1 0.9 1 1.1
GAIN Bass-Dc-Gain DC = off -1 0 1 dB
DC
Step Resolution 0.5 1 1.5 dB
Center Frequency f
C1
f
C2
f
C3
f
C4
2 1.1 1.25 1.4
Q
3 1.3 1.5 1.7
Q
4 1.8 2 2.2
Q
54 60 66 Hz
63 70 77 Hz
72 80 88 Hz
90 100
(150)
(2)
110 Hz
DC = on 3.5 4.4 5.5 dB
Ω
TREBLECONTROL
C
RANGE
A
STEP
C Center Frequency fC1 8 10 12 KHz
f
1) The SM pin is activelow (Mute= 0)
2) SeeNote in Programming Part
Control Range
13
±
15
±
Step Resolution 0.5 1 1.5 dB
C2 10 12.5 15 KHz
f
C3 12 15 18 KHz
f
C4 14 17.5 21 KHz
f
17 dB
±
5/28
TDA7400
ELECTRICALCHARACTERISTICS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SPEAKERATTENUATORS
RIN Input Impedance 35 50 65 KΩ
G
MAX Max Gain 13 15 17 dB
A
MAX
A
STEP
A
MUTE
E
E
V
DC DC Steps Adjacent Attenuation Steps 0.1 5 mV
Max Attenuation -70 -79 dB
Step Resolution 0.5 1 1.5 dB
Output Mute Attenuation 80 90 dB
Attenuation Set Error
2dB
±
AUDIO OUTPUTS
V
CLIP
RL Output LoadResistance 2 KΩ
C
L Output Load Capacitance 10 nF
R
OUT
V
DC
Clipping Level d= 0.3% 2.2 2.6 V
Output Impedance 30 120
DC Voltage Level 4.3 4.5 4.7 V
GENERAL
e
NO
S/N Signal to Noise Ratio all gain = 0dB flat; V
d Distortion V
S
C
E
T
Output Noise BW = 20 Hz to 20 KHz
315µV
output muted
BW = 20 Hz to 20 KHz
6.5 15 µV
all gain = 0dB
O =2VRMS 102 110 dB
bass treble at12dB;
a-weighted; V
IN =1VRMS; all stages0dB 0.002 0.1 %
V
IN =1VRMS;Bass& Treble= 12dB 0.05 0.1 %
= 2.6V
O
RMS
96 100 dB
Channel separation Left/Right 80 100 dB
Total Tracking Error AV= 0 to -20dB -1 0 1 dB
A
= -20 to -60dB -2 0 2 dB
V
BUSINPUTS
V
IL
V
IH
I
IN
V
O Output Voltage SDA
Input Low Voltage d = 0.3% 0.8 V
Input High Voltage 2.5 V
Input Current VIN= 0.4V -5 5
IO = 1.6mA 0.4 V
Acknowledge
RMS
Ω
µ
A
6/28
TDA7400
StereodecoderPart
ELECTRICALCHARACTERISTICS (VS = 9V;deemphasistime constant= 50µs,
MPX
= 500mV(75KHzdeviation), fm= 1KHz, Gv = 6dB,T
V
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
in
R
in
G
MIN
G
MAX
G
STEP
SVRR Supply Voltage Ripple
MPX Input Level Gv = 3.5dB 0.5 1.25 V
Input Resistance 70 100 130 K
Min. Input Gain 1.5 3.5 4.5 dB
Max. Input Gain 8.5 11 12.5 dB
Step Resolution 1.75 2.5 3.25 dB
ripple = 100mV; f = 1KHz 35 60 dB
V
Rejection
α
Max. channel Separation 30 50 dB
THD Total Harmonic Distortion 0.02 0.3 %
S+N
N
Signal plus Noise to Noise
Ratio
A-weighted, S = 2V
MONO/STEREO-SWITCH
VPTHST1 Pilot Threshold Voltage for Stereo, PTH = 1 10 15 25 mV
PTHST0 Pilot Threshold Voltage for Stereo, PTH = 0 15 25 35 mV
V
PTHMO1 Pilot Threshold Voltage for Mono, PTH = 1 7 12 17 mV
V
V
PTHMO0
Pilot Threshold Voltage for Mono, PTH = 1 10 19 25 mV
amb
=27°C; unlessotherwise specified).
rms 80 91 dB
RMS
Ω
PLL
∆f/f Capture Range 0.5 %
DEEMPHASISand HIGHCUT
τHC50
τ
HC75
τ
HC50
τ
HC75 Highcut Time Constant Bit 7, Subadr, 10 = 1,
Deemphasis Time Constant Bit 7, Subadr, 10 = 0,
V
LEVEL >> VHCH
Deemphasis Time Constant Bit 7, Subadr, 10 = 1,
V
>> V
LEVEL
HCH
Highcut Time Constant Bit 7,Subadr, 10 = 0,
V
>> V
V
LEVEL
LEVEL
>> V
HCL
HCL
25 50 75
50 75 100
100 150 200
150 225 300 µs
STEREOBLEND-andHIGHCUT-CONTROL
REF5V Internal Reference Voltage 4.7 5 5.3 V
REF5V Temperature Coefficient 3300 ppm
TC
L
Gmin
L
Gmax
L
Gstep
VSBL
VSBL
VSBL
VHCH
VHCH
VHCH
VHCL
VHCL
VHCL
Min. LEVEL Gain -1 0 1 dB
Max. LEVEL Gain 8 10 12 dB
LEVEL Gain Step Resolution 0.3 0.67 1 dB
Min. Voltage for Mono 25 29 33 %REF5V
min
Min. Voltage for Mono 54 58 62 %REF5V
max
Step Resolution 2.2 4.2 6.2 %REF5V
step
min Min. Voltage for NO Highcut 38 42 46 %REF5V
max Min. Voltage for NO Highcut 62 66 70 %REF5V
step Step Resolution 5 8.4 12 %REF5V
Min. Voltage for FULL Highcut 12 17 22 %VHCH
min
Max. Voltage forFULL Highcut 28 33 38 %VHCH
max
Step Resolution 2.2 4.2 6.2 %VHCH
step
s
µ
s
µ
s
µ
7/28
TDA7400
ELECTRICALCHARACTERISTICS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
Carrierand harmonicsuppressionat the output
α19 Pilot Signal f = 19KHz 40 50 dB
α38 Subcarrier f = 38KHz 75 dB
57 Subcarrier f = 57KHz 62 dB
α
α76
Subcarrier f = 76KHz 90 dB
Intermodulation(Note 1)
2f
α
3f
α
= 10KHz, f
mod
= 13KHz, f
mod
= 1KHz 65 dB
spur
= 1KHz 75 dB
spur
TrafficRatio (Note 2)
57 Signal f = 57KHz 70 dB
α
SCA- SubsidiaryCommunicationsAuthoorization(Note 3)
α67 Signal f = 67KHz 75 dB
ACI - AdjacentChannel Interference(Note 4)
114 Signal f = 114KHz 95 dB
α
α190 Signal f = 190KHz 84 dB
Notes to the characteristics:
V
1. IntermodulationSuppression: α2 =
α3 =
measured with: 91%pilot signal;fm =10kHz or13kHz.
O(signal)(at1KHz
V
O(spurious)(at
V
O(signal)(at1KHz)
V
O(spurious)(at
1KHz)
1KHz)
)
=(2 x 10KHz)−19KHz
;f
s
;f
=(3 x 13KHz)−38KHz
s
2. TrafficRadio (V.F.) Suppression:measured with:91% stereo signal;9% pilot signal; fm=1kHz; 5% subcarrier (f =57kHz,
fm = 23Hz AM,m = 60%)
V
α57(
V.W>F.
)=
V
O
(spurious)(
O(signal)(at1KHz)
+⁄
1KHz
at
23KHz)
−
3. SCA ( Subsidiary Communications Authorization ) measured with: 81% mono signal; 9% pilot signal; fm =1kHz; 10%SCA - subcarrier
( fs = 67kHz, unmodulated).
V
α67=
4. ACI ( Adjacent Channel Interference): α114 =
α190 =
O(signal)(at1KHz)
V
O
(spurious)(
V
O(signal)(at1KHz
V
O(spurious)(at
V
O(signal)(at1KHz)
V
O(spurious)(at
9KHz)
at
4KHz)
4KHz)
2 x 38KHz)−67KHz
F
;
=(
S
)
=110KHz− (3x38KHz)
;F
S
=186KHz− (5x38KHz)
;F
S
measured with: 90% mono signal; 9% pilotsignal; fm =1kHz; 1% spurious signal ( fs =110kHz or 186kHz, unmodulated).
8/28
NOISE BLANKER PART
TDA7400
internal 2ndorder 140kHz high passfilter
programmabletriggerthreshold
trigger threshold dependent on high frequency
noise withprogrammable gain
additional circuits for deviation and field-
very low offset current during hold time due to
opamps wMOSinputs
four selectablepulse suppressiontimes
programmable noise rectifier charge/discharge
current
strength dependenttrigger adjustment
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
TR
Trigger Threshold
VTRNOISE Noise ControlledTrigger
Threshold
V
RECT
V
RECT DEV
Rectifier Voltage V
deviation dependent
rectifier Voltage
VRECT FS Fieldstrength Controlled
Rectifier Voltage
T
V
RECTADJ
S
Suppression Pulse
Duration
5)
Noise Rectifier
discharge adjustment
SR
PEAK Noise Rectifier Charge Signal PEAKin
(c) = by design/characterization functionally guaranteed through dedicated test mode structure
0) 1)
meas. with V
= 0.9V NBT = 111 (c) 30 (c) mV
PEAK
NBT = 110 (c) 35 (c) mVOP
NBT = 101 (c) 40 (c) mVOP
NBT = 100 (c) 45 (c) mV
NBT = 011 (c) 50 (c) mV
NBT = 010 (c) 55 (c) mV
NBT = 001 (c) 60 (c) mV
NBT = 000 (c) 65 (c) mVOP
2)
meas. with VPEAK = 1.5V NCT = 00 (c) 260 (c) mVOP
NCT = 01 (c) 220 (c) mV
NCT = 10 (c) 180 (c) mV
NCT = 11 (c) 140 (c) mV
= 0mV NRD6)= 00 0.5 0.9 1.3 V
MPX
V
MPX = 50mV; f = 150KHz 1.5 1.7 2.1 V
V
MPX = 200mV; f = 150KHz 2.2 2.5 2.9 V
3)
means. with
V
MPX = 800mV
(75KHz dev.)
OVD = 11 0.5 0.9(off) 1.3 V
OVD = 10 0.9 1.2 1.5 V
OVD = 01 1.7 2.0 2.3 V
OVD = 00 2.5 2.8 3.1 V
4)
means. with
V
= 0mV
MPX
V
<< V
LEVEL
SBL
(fully mono)
Signal HOLDN
in Testmode
FSC = 11 0.5 0.9(off) 1.3 V
FSC = 10 0.9 1.4 1.5 V
FSC = 01 1.7 1.9 2.3 V
FSC = 00 2.1 2.4 3.1 V
BLT = 00 TBD 38 TBD
BLT = 10 TBD 32 TBD
BLT = 01 TBD 25.5 TBD µs
Signal PEAK in
6)
Testmode
Testmode
BLT = 00 TBD 22 TBD µs
NRD = 00
NRD = 01
NRD = 10
NRD = 11
PCH = 0
PCH = 1
6)
(c) 0.3 (c) V/ms
6)
(c) 0.8 (c) V/ms
6)
(c) 1.3 (c) V/ms
6)
(c) 2.0 (c) V/ms
7)
(c) 10 (c) mV/µs
7)
(c) 20 (c) mV/µs
OP
OP
OP
OP
OP
OP
OP
OP
OP
OP
OP
OP
s
µ
s
µ
9/28
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