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PDF STV0056AF Data sheet ( Hoja de datos )
| Número de pieza | STV0056AF | |
| Descripción | SATELLITE SOUND AND VIDEO PROCESSORS | |
| Fabricantes | ST Microelectronics | |
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STV0056AF
SATELLITE SOUND AND VIDEO PROCESSOR
SOUND
. TWO INDEPENDENTSOUND DEMODULATORS
. PLL DEMODULATION WITH 5-10MHz FRE-
QUENCY SYNTHESIS
. PROGRAMMABLE FM DEMODULATOR
BANDWIDTH ACCOMODATING FM DEVIA-
TIONS FROM ±30kHz TILL ±400kHz
. PROGRAMMABLE 50/75µs, J17 OR NO DE-
EMPHASIS
. WEGENER PANDA SYSTEM
. TWOAUXILIARYAUDIO INPUTS ANDOUTPUTS
. GAIN CONTROLLED AND MUTEABLE
AUDIO OUTPUTS
. HIGH IMPEDANCE MODE AUDIO OUTPUTS
FOR TWIN TUNER APPLICATIONS
VIDEO
. COMPOSITE VIDEO 6-bit 0 to 12.7dB GAIN
CONTROL
. COMPOSITE VIDEO SELECTABLE INVERTER
. TWO SELECTABLE VIDEO DE-EMPHASIS
NETWORKS
. 6 x 3 VIDEO MATRIX
. BLACK LEVEL ADJUSTABLE OUTPUT FOR
ON-BOARD VIDEOCRYPT DECODER
. HIGH IMPEDANCE MODE VIDEO OUTPUTS
FOR TWIN TUNER APPLICATIONS
MISCELLANEOUS
. 22kHzTONE GENERATIONFOR LNB CONTROL
. I2C BUS CONTROL
CHIP ADDRESSES = 06HEX OR 46HEX
. LOW POWER STAND-BY MODE WITH AC-
TIVE AUDIO AND VIDEO MATRIXES
TQFP64 (10 x 10mm)
(Thin Plastic Quad Flat Pack)
ORDER CODE : STV0056AF
DESCRIPTION
The STV0056AF BICMOS integratedcircuit realizes
all the necessary signal processing from the tuner to
theAudio/Videoinput andoutputconnectors regard-
less the satellite system.
February 1998
1/27
1 page  
STV0056AF
PIN DESCRIPTION (continued)
2 - Baseband Audio Processing
PK OUT L, PK OUT R, PK OUT
The noise reduction control loop peak detector
output requires a capacitor to ground from this pin,
and a resistor to VREF pin to give some accurate
decaytime constant.An on chip5kΩ ±25 % resistor
and external capacitor give the attack time.
PK IN L, PK IN R or PK IN
Each of thesepins is an input to a control loop peak
detector and is connected to the output of the
offchip control loop band pass filter.
LEVEL L, LEVEL R
Respectively the audio left and right signals of the
FM demodulators are output to level L and level R
pins through an input follower buffer. The off-chip
filters driven by these pins must include AC cou-
pling to the next stage (PK IN L and PK IN R pins
respectively).
FC L, FC R
The variable bandwidth transconductance ampli-
fier has a current output which is variable depend-
ing on the input signal amplitude as defined by the
control loop of the noise reduction. The output
current is then dumped into an off-chip capacitor
which together with the accurate current reference
define the min/max rolloff frequencies.A resistor in
series with a capacitor is connectedto ground from
these two pins.
J17 L, J17 R
The external J17 de-emphasis networks for chan-
nels left and right. The amplifier for this filter is
voltage input, current output. Output with ±500mV
input will be ±55µA.
To perform J17 de-emphasiswith the STV0042,an
external circuit is required.
U75 L, U75 R
External deemphasis networks for channels left
and right. For each channela capacitorand resistor
in parallel of 75µs time constant are connected
between here and VREF to provide 75µs de-empha-
sis. Internally selectable is an internal resistor that
can be programmedto be added in parallel thereby
converting the network to approx 50µs de-empha-
sis (see control block map). The value of the inter-
nal resistors is 54kΩ ±30 %. The amplifier for this
filter is voltage input, current output ; with ±500mV
input the output will be ±55µA.
VOL L, VOL R
The main audio output from the volume control
amplifier the signal to get output signals as high as
2VRMS (+12dB) on a DC bias of 4.8V. Control is
from +12dB to -26.75dB plus Mute with 1.25dB
steps. This amplifier has shortcircuitprotectionand
is intendedto drive a SCART connectordirectly via
AC coupling and meets the standard SCART drive
requirements. These outputs feature high imped-
ance mode for parallel connection.
S2 OUT L, S2 OUT R, S3 OUT L, S3 OUT R
These audio outputs are sourced directly from the
audio MUX, and as a result do not include any
volume control function. They will output a 1VRMS
signal biased at 4.8V. They are short circuit pro-
tected. These outputs feature high impedance
mode for parallel connection and meet SCART
drive requirement.
S2 RTN L, S2 RTN R, S3 RTN L, S3 RTN R
These pins allow auxiliary audio signals to be con-
nected to the audio processor and hence makes
use of the on-chip volume control. For additional
details please refer to the audio switching table.
5/27
5 Page 
STV0056AF
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VDD
Ptot
Toper
Tstg
Supply Voltage
Parameter
Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
THERMAL DATA
Symbol
Rth(j-a)
Parameter
Thermal Resistance Junction-ambient
Max.
Value
15
7.0
900
0, + 70
-55, + 150
Unit
V
V
mW
oC
oC
Value
55
Unit
oC/W
DC AND AC ELECTRICAL CHARACTERISTICS
(VCC = 12V, VDD = 5V, Tamb = 25oC unless otherwise specified)
Symbol
Parameter
VCC
VDD
IQCC
IQDD
IQLPCC
IQLPDD
Sypply Voltage
Supply Current
Supply Current at Low Power Mode
AUDIO DEMODULATOR
Test Conditions
All audio and all video outputs
activated
All audio and all video outputs
are in high impedance mode
FMIN FM Subcarrier Input Level
(Pin FMIN for AGC action)
DETH
VCOMI
VCOMA
AP50
Detector 1 and 2 (AMPLOCK Pins)
(Threshold for activating Level Detector 2)
VCO Mini Frequency
VCO Maxi Frequency
1kHz Audio Level at PLL output
(DET Pins)
APA50 1kHz Audio Level at PLL output
(DET Pins)
FMBW FM Demodulator Bandwidth
DPCO Digital Phase Comparator Output
Current (CPUMP Pins)
VCO locked on carrier at 6MHz
560kΩ load on AMPLOCK Pins
180kΩ load on DET Pins
8mVPP ≤ FMIN ≤ 500mVPP
Carrier without modulation
VCC : 11.4
Tamb : 0 to
to 12.6V,
70oC
0.5VPP 50kHz dev. FM input,
Coarse deviation set to 50kHz
(Reg. 05 = 36HEX)
0.5VPP 50kHz dev. FM input,
Coarse and fine settings used
Gain at 12kHz versus 1kHz
180kΩ, 82kΩ 22pF on DET Pins
Average sink and source
current to external capacitor
AUTOMATIC NOISE REDUCTION SYSTEM
LRS
LDOR
NDFT
NDLL
LLCF
HLCF
Output Level (Pins LEVEL)
Level Detector Output Resistance
(Pins PK OUT)
Level Detector Fall Time Constant
(Pins PK OUT)
Bias Level (Pins PK OUT)
Noise Reduction Cut-off Frequency at
Low Level Audio
Noise Reduction Cut-off Frequency at
High Level Audio
1VPP on left and right channel
External 22nF to GND and
1.2MΩ to VREF
No audio in
100mVPP on DET Pins, External
capacitor 330pF (FC Pins)
1VPP on DET Pins, External
capacitor 330pF (FC Pins)
Min.
11.4
4.75
5
2.90
10
0.6
0.92
0
0.9
4.0
Typ.
12
5.0
55
8
27
6
3.10
1
1
0.3
60
1
5.4
26.4
2.40
0.85
7
Max.
12.6
5.25
70
15
35
9
Unit
V
V
mA
mA
mA
mA
500 mVPP
3.30 V
5
1.35
MHz
MHz
VPP
1.08 VPP
1 dB
µA
1.1 VPP
6.8 kΩ
ms
V
kHz
kHz
11/27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet STV0056AF.PDF ] | |
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