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PDF PT7314 Data sheet ( Hoja de datos )
| Número de pieza | PT7314 | |
| Descripción | 4-Channel Input Audio Processor | |
| Fabricantes | ETC | |
| Logotipo |  |
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4-Channel Input Audio Processor
7314
DESCRIPTION
7314 is a four-channel input digital audio processor utilizing CMOS Technology. Volume, Bass, Treble
and Balance are incorporated into a single chip. Loudness Function and Selectable Input Gain are also
provided to build a highly effective electronic audio processor having the highest performance and
reliability with the least external components. All functions are programmable using the I2C Bus. The
pin assignments and application circuit are optimized for easy PCB layout and cost saving advantage
for audio application.
FEATURES
• CMOS technology
• Least external components
• Treble and bass control
• Loudness function
• 4 stereo inputs with selectable input gain
• Input/output for external noise reduction system/equalizer
• 2 independent speaker controls for balance control
• Independent mute function
• Volume control in 1.25 dB/step
• Low distortion
• Low noise and DC stepping
• Controlled by I2C bus micro-processor interface
• Available in 28 Pins, DIP or SOP
APPLICATIONS
• Car stereo (Audio)
• Hi-Fi audio system
Note: Purchase of I2C Component of Princeton Technology Corporation (PTC) conveys a license
under Philips I2C Patent Right to use these components in any I2C System, provided that the system
conforms to the I2C Standard Specification defined by Philips
7314 V1.0
-1-
January, 2007
Free Datasheet http://www.datasheet4u.com/
1 page  
4-Channel Input Audio Processor
7314
FUNCTIONAL DESCRIPTION
BUS INTERFACE
Data are transmitted to and from the microprocessor to the 7314 via the DATA and CLK. The DATA
and CLK make up the BUS Interface. It should be noted that the pull-up resistors must be connected to
the positive supply voltage.
DATA VALIDITY
A data on the DATA Line is considered valid and stable only when the CLK Signal is in HIGH State. The
HIGH and LOW State of the DATA Line can only change when the CLK signal is LOW. Please refer to
the figure below.
DATA
CLK
DATA LINE
DATA
STABLE,
CHANGE
DATA VALID ALLOWED
START AND STOP CONDITIONS
A Start Condition is activated when
1) the CLK is set to HIGH and
2) DATA shifts from HIGH to LOW State.
The Stop Condition is activated when
1) CLK is set to HIGH and
2) DATA shifts from LOW to HIGH State. Please refer to the timing diagram below.
CLK
DATA
START
STOP
BYTE FORMAT
Every byte transmitted to the DATA Line consist of 8 bits. Each byte must be followed by an
Acknowledge Bit. The MSB is transmitted first.
7314 V1.0
-5-
January, 2007
Free Datasheet http://www.datasheet4u.com/
5 Page 
4-Channel Input Audio Processor
7314
ELECTRICAL CHARACTERISTICS
(Unless specified: Ta=25℃, Vc=9V, RL=10KΩ, Rg = 600Ω, all controls flat (G=0), f=1KHz)
Parameter
Symbol Test Condition
Min. Typ. Max. Unit
Supply
Supply voltage
Vcc
6 9 10
V
Supply current
Is
30 40
mA
Input Selectors
Input resistance
Clipping level
Input separation (2)
Min. input gain
Max. input gain
Volume Control
RII Input 1,2,3
80 100 120
VCL Av=-8.75 dB ; d=0.3% 2
2.5
SIN 80 100
GINmin
-1 0 1
GINmax
11.25
KΩ
Vrms
dB
dB
dB
Input resistance
Control range
Min. attenuation
Max. attenuation
Step resolution
Attenuation set error
RIV
CRANGE
AVMIN
AVMAX
ASTEP
EA
AV=0 to -20dB
AV=-20 to –60dB
30
65
-1
65
0.5
-1.25
-3.0
40
70
0
70
1.25
0
50
75
1
75
1.75
1.25
2
KΩ
dB
dB
dB
dB
dB
dB
Speaker Attenuators
Control range
Step resolution
Attenuation set error
Output mute
attenuation
CRANGE
SSTEP
EA
AMUTE
35 37.5 40
0.5 1.25 1.75
1.5
75 85
dB
dB
dB
dB
Bass Control (1)
Control range
Gb Max. Boost/Cut
±12 ±14 ±16
dB
Step resolution
Internal feedback
resistance
BSTEP
RB
123
34 44 58
dB
KΩ
Treble Control (1)
Control range
Gt Max. Boost/Cut
±13 ±14 ±15
dB
Step resolution
TSTEP
123
dB
7314 V1.0
- 11 -
January, 2007
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet PT7314.PDF ] | |
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