®
TDA7314
DIGITAL CONTROLLED AUDIO PROCESSOR
WITH LOUDNESS
1 STEREO INPUT
SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTION TO DIFFERENT SOURCES
INPUT AND OUTPUT FOR EXTERNAL
EQUALIZER OR NOISE REDUCTION SYS-
TEM
LOUDNESS FUNCTION
VOLUME CONTROL IN 1.25dB STEPS
TREBLE AND BASS CONTROL
FOUR SPEAKER ATTENUATORS:
- 4 INDEPENDENT SPEAKERS CONTROL
IN 1.25dB STEPS FOR BALANCE AND
FADER FACILITIES
- INDEPENDENT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL BUS
DESCRIPTION
The TDA7314 is a volume, tone (bass and treble)
balance (Left/Right) and fader (front/rear) processor
for quality audio applications in car radio and Hi-Fi
systems.
PIN CONNECTION
(Top view)
SDIP24
ORDERING NUMBER:
TDA7314
Selectable input gain and internal loudness function
are provided. Control is accomplished by serial bus
microprocessor interface.
The AC signal setting is obtained by resistor networks
andswitches combined with operationalamplifiers.
Thanks to the used BIPOLAR/CMOS Tecnology,
Low Distortion, Low Noise and DC stepping are ob-
tained.
November 1999
1/12
TDA7314
TEST CIRCUIT
THERMAL DATA
Symbol
R
th j-pins
Description
Thermal Resistance Junction-pins
Ma x.
Value
65
Unit
°C/W
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
T
amb
T
stg
Operating Supply Voltage
Operating Ambient Temperature
Storage Temperature Range
Parameter
Value
10.2
-40 to 85
-55 to +150
Unit
V
°
C
°C
QUICK REFERENCE DATA
Symbol
V
S
V
CL
THD
S/N
S
C
Supply Voltage
Max. input signal handling
Total Harmonic Distortion V = 1Vrms f = 1KHz
Signal to Noise Ratio
Channel Separation f = 1KHz
Volume Control
1.25dB step
2db step
1.25dB step
-78.75
-14
-38.75
0
100
Bass and Treble Control
Input Gain
6.25dB step
Parameter
Min.
6
2
0.01
106
103
0
+14
0
18.75
0.1
Typ.
9
Max.
10
Unit
V
Vrms
%
dB
dB
dB
dB
dB
dB
dB
Fader and Balance Control
Mute Attenuation
2/12
TDA7314
ELECTRICAL CHARACTERISTICS
(refer to the test circuit T
amb
= 25°C, V
S
= 9V, R
L
= 10K
Ω
, R
G
=
600
Ω
, all controls flat (G = 0), f = 1KHz unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY
V
S
I
S
SVR
Supply Voltage
Supply Current
Ripple Rejection
60
6
9
8
80
10
11
V
mA
dB
INPUT STAGE
R
II
V
CL
R
L
G
INmin
G
INmax
G
STEP
e
IN
V
DC
Input Resistance
Clipping Level
Output Load resistance
Min. Input Gain
Max. Input Gain
Step Resolution
Input Noise
DC Steps
G = 18.75dB
adjacent gain steps
G = 18.75 to Mute
pin 7, 17
Pin 9, 11
35
2
2
-1
0
18.75
6.25
2
4
4
20
1
50
2.5
70
K
Ω
Vrms
KΩ
dB
dB
dB
µV
mV
mV
VOLUME CONTROL
R
IV
C
RANGE
A
VMIN
A
VMAX
A
STEP
E
A
E
T
V
DC
Input Resistance
Control Range
Min. Attenuation
Max. Attenuation
Step Resolution
Attenuation Set Error
Tracking Error
DC Steps
adjacent attenuation steps
From 0dB to Av max
0
0.5
Av = 0 to -20dB
Av = -20 to -60dB
20
70
-1
70
0.5
-1.25
-3
33
75
0
75
1.25
0
50
80
1
80
1.75
1.25
2
2
3
7.5
kΩ
dB
dB
dB
dB
dB
dB
dB
mV
mV
SPEAKER ATTENUATORS
C
range
S
STEP
E
A
A
MUTE
V
DC
Control Range
Step Resolution
Attenuation set error
Output Mute Attenuation
DC Steps
adjacent att. steps
from 0 to mute
80
100
0
1
3
10
35
0.5
37.5
1.25
40
1.75
1.5
dB
dB
dB
dB
mV
mV
BASS CONTROL (1)
Gb
B
STEP
R
B
Control Range
Step Resolution
Internal Feedback Resistance
Max. Boost/cut
+12
1
34
+14
2
44
+16
3
58
dB
dB
KΩ
TREBLE CONTROL (1)
Gt
T
STEP
Control Range
Step Resolution
Max. Boost/cut
+13
1
+14
2
+15
3
dB
dB
4/12
TDA7314
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
AUDIO OUTPUTS
V
OCL
R
L
C
L
R
OUT
V
OUT
Clipping Level
Output Load Resistance
Output Load Capacitance
Output resistance
DC Voltage Level
30
4.2
75
4.5
d = 0.3%
2
2
10
120
4.8
2.5
Vrms
KΩ
nF
Ω
V
GENERAL
e
NO
Output Noise
BW = 20-20KHz, flat
output muted
all gains = 0dB
A curve all gains = 0dB
S/N
d
Signal to Noise Ratio
Distortion
all gains = 0dB; V
O
= 1Vrms
A
V
= 0, V
IN
= 1Vrms
A
V
= -20dB V
IN
= 1Vrms
V
IN
= 0.3Vrms
80
A
V
= 0 to -20dB
-20 to -60 dB
2.5
5
3
106
0.01
0.09
0.04
103
0
0
1
2
0.1
0.3
µV
µ
V
µV
dB
%
%
%
dB
dB
dB
15
Sc
Channel Separation left/right
Total Tracking error
BUS INPUTS
V
IL
V
IH
I
IN
V
O
Note:
(1) Bass and Treble response see attached diagram (fig.19). The center frequency and quality of the resonance behaviour can be choosen by
the external circuitry. A standard first order bass response can be realized by a standard feedback network.
Input Low Voltage
Input High Voltage
Input Current
Output Voltage SDA
Acknowledge
I
O
= 1.6mA
3
-5
1
+5
0.4
V
V
µ
A
V
Figure 1:
Loudness versus Volume Attenuation
Figure 2:
Loudnessversus Frequency
(C
LOUD
= 100nF)
5/12
DSP 与 ARM 处理器
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