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PDF S1A0688C01-A0B0 Data sheet ( Hoja de datos )
| Número de pieza | S1A0688C01-A0B0 | |
| Descripción | TV SOUND MPX FOR TWO CARRIER SYSTEM | |
| Fabricantes | Samsung semiconductor | |
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Hay una vista previa y un enlace de descarga de S1A0688C01-A0B0 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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TV SOUND MPX FOR TWO CARRIER SYSTEM
INTRODUCTION
The S1A0688C01 is a monolithic integrated circuit designed for
demodulating two carrier TV-MPX broadcast.
32−SDIP−400
FEATURES
• 1st & 2nd Sound IF
• Double-PLL FM Detection
• AGC for CCA part
• Matrix for Multi-Sound Broadcasts
• Pilot Detector
• External Control Interface
• ID Indicators (Stereo, Bilingual)
• Available for Korea standard
• Non-clipping Output up to 400% modulation with AGC
• Available in DC control, Normal microcontroler control or IIC bus control systems
• ID output: Direct LED drive or IIC serial data output
• Non-adjust
ORDERING INFORMATION
Device
S1A0688C01-A0B0
Package
32−SDIP−400
Operating Temperature
−10 to + 70 °C
S1A0688C01
1
1 page  
TV SOUND MPX FOR TWO CARRIER SYSTEM
S1A0688C01
ELECTRICAL CHARACTERISTICS
DC Electrical Characteristics
(Ta = 25°C, VCC = VDD = 5V, fm = 1kHz, VI = 80dBµ, ∆f = ± 25kHz, unless otherwise specified)
Parameter
Symbol
Condition
Min.
Typ.
Max.
ICC Vi = 0
35 60 85
IDD Vi = 0
− − 2.0
SIF Input Limiting Voltage Vlim
− − − 50
AM Rejection Ratio
AMRR
AM 30% Mod
40 55 −
Input Impedance
Zin
− − 1−
PILOT Pilot Input Sensitivity
* ID ON time
Vps
Ton
−
MONO → ST, BI
− − 50
− 1.0 1.5
ID OFF time
Toff ST, BI → MONO − − 0.3
Output level
Vo
− 320 420 520
Matrix Matrix THD
THDm1
−
− 0.2 1.0
THDm2 ∆ f = ± 100kHz
− 0.5 5.0
Noise Output (RF off) Voff
Carrier OFF
− − 400
Output Impedance
Zout
− − − 50
Separation Ratio
SEPtyp non-adjust
25 − −
SEPadj IIC Bus adjust
40 45 −
Cross Talk
CT ∆ f = ± 25kHz
50 55 −
Matrix S/N Ratio
S/N
∆ f = ± 25kHz
55 60 −
S/N(st)
∆ f = ± 25kHz (ST)
50
55
−
MUTE Attenuation
Ratio
Amute
∆ f = ± 25kHz
− −66 −55
* : Pilot signal FM deviation is ± 2.5kHz after 50% AM modulation.
Unit
mA
mA
dBµ
dB
Kohm
dBµ
SEC
SEC
mVrms
%
%
mVrms
ohm
dB
dB
dB
dB
dB
dB
5
5 Page 
TV SOUND MPX FOR TWO CARRIER SYSTEM
S1A0688C01
OPERATION DESCRIPTION
SYSTEM
S1A0688C01 consists of IF AMP, FM DET, AGC, MATRIX, U-COM Control INTERFACE and ID DET blocks. All
blocks are operable and available without adjust for Korea standard broadcast system.
IF AMP BLOCK
This block amplifies the provided IF signal to a detectable level of FM DET. Total gain is over 60dB and bandwidth
is about 3 − 10MHz.
FM DET
S1A0688C01 adopts non-adjust double-PLL type FM detection circuits. First PLL has a role of chasing FM carrier
frequency with wide holding range (for example, hold range is 2MHz) and second PLL does actual FM detection
with narrow holding range (about 300kHz), The free running frequency of 2nd PLL is same as the lock frequency of
1 st. PLL, and free running frequency of 1 st. PLL is determined by internal Resistor and Capacitor. The free run-
ning frequency can be varied by the variation of resistor and capacitor.
AGC
The AGC block comprises AGC detector part and CCA part (Current control Amplifier). The MATRIX output signal
level is set to 400mVrms when applied 100% modulated FM signal and supply voltage is 5V. As the gain of CCA is
about 6 dB and the gain of matrix is 6dB, so the output signal level of CCA is 200 mVrms and the matrix output is
400 mVrms. If over- modulated (over 200%) FM signal is added to S1A0688C01 input port, the output will be
clipped by supply voltage dynamic limitation range (The linear amplify range is limited lower than 800 mVrms).
To prevent this problem, In S1A0688C01 we use AGC circuit to reduce the gain of CCA part when the over- modu-
lated FM signal has been applied, AGC circuit is deactivated until the modulation is over 200%. If AGC is activated,
the THD and separation characteristics of output signal would be deteriorated because the gain of CCA is varied
according to modulation ratio.
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet S1A0688C01-A0B0.PDF ] | |
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