TDA7348, Elektronika i elektryka, Serwisówki
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TDA7348
DIGITALLY CONTROLLED AUDIO PROCESSOR
PRODUCT PREVIEW
INPUT MULTIPLEXER
- THREE STEREO AND ONE MONO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
VOLUME CONTROL IN 0.3dB STEPS IN-
CLUDING GAIN UP TO 20dB
ZERO CROSSING MUTE AND DIRECT
MUTE
PAUSE DETECTOR WITH PROGRAMMABLE
THRESHOLD
SOFT MUTE CONTROLLED BY SOFTWARE
OR HARDWARE PIN
BASS AND TREBLE CONTROL
FOUR SPEAKER ATTENUATORS
- FOUR INDEPENDENT SPEAKERS
CONTROL IN 1.25dB STEPS FOR
BALANCE AND FADER FACILITIES
- INDEPENDENT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL I
2
CBUS
DIP28
SO28
ORDERING NUMBER:
TDA7348 (DIP28)
TDA7348D (SO28)
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 Several new features like
softmute, zero-crossing mute and pause detector
are implemented.
The Soft Mute function can be activated in two
ways:
1 Via serial bus (bit D0, Mute Byte)
2 Directly on pin 22 through an I/O line of the
microcontroller
Very low DC stepping is obtained by use of a
BICMOS technology.
DESCRIPTION
The TDA7348 is an upgrade of the TDA7318
audioprocessor.
Thanks to the used BIPOLAR/CMOS technology,
very low distortion, low noise and DC-stepping
are obtained.
1/14
November 1994
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
R2
4.7K
C10 2.2
m
F
C14
100nF
C16
2.7nF
C15
100nF
OUT(L)
IN(L)
SM
BOUT(L)
BIN(L)
TREBLE(L)
17
16
22
19
18
4
SPKR
ATT
3 x
1
RB
26
m
F
L1
14
L1
OUT
LEFT FRONT
C1
MUTE
L2
13
L2
LEFT
INPUTS
ZERO
CROSS +
MUTE
VOL
1, 2
C2
BASS
TREBLE
L3
12
L3
SPKR
ATT
C3
L4
24
OUT
LEFT REAR
MUTE
C4
28
27
11
INPUT
SELECTOR
+ GAIN
SCL
SDA
SOFT
MUTE
SERIAL BUS DECODER + LATCHES
BUS
SPKR
ATT
R4
3 x
1
m
F
25
R3
8
R3
OUT
RIGHT FRONT
ZERO
CROSS +
MUTE
C7
MUTE
VOL
1, 2
R2
9
R2
BASS
TREBLE
RIGHT
INPUTS
C6
R1
10
R1
SPKR
ATT
C5
23
RB
2
OUT
RIGHT REAR
V
S
SUPPLY
MUTE
3
1
7
OUT(R)
6
15
21
20
5
AGND
CREF
IN(R)
C
SM
B
OUT(R
)
BIN(R)
T
REBLE(R)
D93AU100A
C8
10
m
F
CSM
C11
47nF
C12
100nF
C13
2.7nF
C9 2.2
m
F
R1
4.7K
TDA7348
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
10.5
V
T
amb
Operating Ambient Temperature
-40 to 85
°
C
T
stg
Storage Temperature Range
-55 to 150
°
C
PIN CONNECTION
CREF
V
S
GND
L
R
1
28
27
26
25
24
SCL
BUS
INPUTS
2
SDA
3
OUT LF
4
5
6
7
8
9
OUT RF
TREBLE
OUT LR
IN(R)
OUT(R)
IN R3
IN R2
IN R1
23
22
21
20
19
OUT RR
SM
BOUT(R)
BIN(R)
BASS
10
11
12
13
14
BOUT(L)
BIN(L)
AM MONO
18
IN L3
17
OUT(L)
IN L2
IN L1
16
15
IN(L)
CSM
D94AU099
THERMAL DATA
Symbol
Parameter
DIP28
SO28
Unit
R
th j-amb
Thermal Resistance Junction-pins
85
65
°
C/W
QUICK REFERENCE DATA
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
6
9
10.2
V
V
CL
Max. input signal handling
2.1
2.6
Vrms
THD
Total Harmonic Distortion V = 1Vrms f = 1KHz
0.01
0.08
%
S/N
Signal to Noise Ratio
106
dB
S
C
Channel Separation f = 1KHz
100
dB
Volume Control
-78.45
20
dB
Treble Control 2dB step
-14
+14
dB
Bass Control 2dB step
-10
+18
dB
Fader and Balance Control 1.25dB step
-38.75
0
dB
Input Gain 3.75dB step
0
11.25
dB
Mute Attenuation
100
dB
3/14
TDA7348
ELECTRICAL CHARACTERISTICS
(V
S
= 9V; R
L
= 10K
W
; R
g
= 50
W
; T
amb
= 25
°
C; all controls flat
(G = 0.3dB step 0dB); f = 1KHz. Refer to the test circuit, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
INPUT SELECTOR
R
I
Input Resistance
70
100
130
K
W
V
CL
Clipping Level
d
£
0.3%
2.1
2.6
V
RMS
S
I
Input Separation
80
100
dB
R
L
Output Load Resistance
2
K
W
G
I MIN
Minimum Input Gain
-0.75
0
0.75
dB
G
I MAX
Maximum Input Gain
10.25
11.25
12.25
dB
G
step
Step Resolution
2.75
3.75
4.75
dB
e
N
Input Noise
20Hz to 20 KHz unweighted
2.3
m
V
V
DC
DC Steps
Adiacent Gain Steps
1.5
10
mV
G
IMIN
to G
IMAX
3
mV
VOLUME CONTROL (1 + 2)
R
I
Input Resistance
35
50
K
W
G
MAX
Maximum Gain
18.75
20
21.25
dB
A
MAX
Maximum Attenuation
78.45
dB
A
STEPC
Step Resolution Coarse
Attenuation
0.5
1.25
2.0
dB
A
STEPF
Step Resolution Fine Attenuation
(Only Volume 1)
0.11
0.31
0.51
dB
E
A
Attenuation Set Error
G = 20 to -20dB
-1.25
0
1.25
dB
G = -20 to -58dB
-3
2
dB
E
t
Tracking Error
2
dB
V
DC
DC Steps
Adiacent Attenuation Steps
-3
0
3
mV
From 0dB to A
MAX
0.5
5
mV
ZERO CROSSING MUTE
V
TH
Zero Crossing Threshold
(note 1)
WIN = 11
20
mV
WIN = 10
40
mV
WIN = 01
80
mV
WIN = 00
160
mV
A
MUTE
Mute Attenuation
80
100
dB
V
DC
DC Step
0dB to Mute
0
3
mV
SOFT MUTE
A
MUTE
Mute Attenuation
45
60
dB
T
DON
ON Delay Time
C
CSM
= 22nF; 0 to -20dB; I = I
MAX
0.7
1
1.7
ms
C
CSM
= 22nF; 0 to -20dB; I = I
MIN
20
35
55
ms
T
DOFF
OFF Current
V
CSM
= 0V; I = I
MAX
25
50
75
m
A
V
CSM
= 0V; I = I
MIN
1
m
A
V
THSM
Soft Mute Threshold
1.5
2.5
3.5
V
R
INT
Pullup Resistor (pin 22)
(note 2)
35
50
65
K
W
V
SMH
(pin 22) Level High
Soft Mute Active
3.5
V
V
SML
(pin 22) Level Low
1
V
4/14
TDA7348
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
BASS CONTROL
B
BOOST
Max Bass Boost
15
18
20
dB
B
CUT
Max Bass Cut
-8.5
-10
-11.5
dB
A
step
Step Resolution
1
2
3
dB
R
g
Internal Feedback Resistance
45
65
85
K
W
TREBLE CONTROL
C
RANGE
Control Range
±
13
±
14
±
15
dB
A
step
Step Resolution
1
2
3
dB
SPEAKER ATTENUATORS
C
RANGE
Control Range
35
37.5
40
dB
A
step
Step Resolution
0.5
1.25
2.0
dB
A
MUTE
Output Mute Attenuation
Data Word = XXX11111
80
100
dB
E
A
Attenuation Set Error
1.25
dB
V
DC
DC Steps
Adjacent Attenuation Steps
0
3
mV
AUDIO OUTPUT
V
clip
Clipping Level
d = 0.3%
2.1
2.6
Vrms
R
L
Output Load Resistance
2
K
W
R
O
Output Impedance
30
100
W
V
DC
DC Voltage Level
3.5
3.8
4.1
V
GENERAL
V
CC
Supply Voltage
6
9
10.2
V
I
CC
Supply Current
10
15
mA
PSRR
Power Supply Rejection Ratio
f = 1KHz
60
80
dB
B = 20 to 20kHz "A" weighted
65
dB
e
NO
Output Noise
Output Muted (B = 20 to 20kHz flat)
2.5
m
V
All Gains 0dB (B = 20 to 20kHz flat)
5
15
m
V
E
t
Total Tracking Error
A
V
= 0 to -20dB
0
1
dB
A
V
= -20 to -60dB
0
2
dB
S/N
Signal to Noise Ratio
All Gains = 0dB; V
O
= 1V
rms
106
dB
S
C
Channel Separation
80
100
dB
d
Distortion
V
IN
= 1V
0.01
0.08
%
BUS INPUTS
V
IL
Input Low Voltage
1
V
V
lN
Input High Voltage
3
V
I
lN
Input Current
VIN = 0.4V
-5
5
m
A
V
O
Output Voltage SDA
Acknowledge
I
O
= 1.6mA
0.4
0.8
V
Note 1: WIN represents the MUTE programming bit pair D
6
, D
5
for the zero crossing window threshold
Note 2: Internal pullup resistor to Vs/2; "LOW" = softmute active
r
5/14
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