STV0042 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STV0042 Datasheet PDF : 37 Pages
| |||
STV0042/STV0056 APPLICATION NOTE
2 - GENERAL BLOCK DIAGRAMS (differences between STV0042 and STV0056) (continued)
Figure 2 : STV0056 General Block Diagram
From Tuner
From TV,
VCR/Decoder
From Tuner
22kHz to LNB
B-BAND 2
Video
Processing
4
2
FM
Demodulation
2 Channels
Noise
Reduction +
Deemphasis
STV0056
6x3
3
Video
Matrix
Audio
Matrix
3
+
Volume
I2C Bus
Interface
To TV, VCR/Decoder
Active in Stand-by
Both circuits contain the following main functions :
Video :
- a baseband video processing block,
- a video switching matrix,
Audio :
- 2 independant FM demodulators,
- an audio processing part containing (audio de-
emphasis, noise reduction),
- an audio switching matrix with a volume control
output,
Others :
- an I2C bus decoder,
- a 22kHz tone generator for LNB control.
When the circuit is in stand-by (R4 B3 = high), all
the functions are turned-off except for the I2C bus
interface and the audio and video matrix. With
such a configuration, it is still possible to allow
signals to go through the satellite receiver while
having a lower power consumption.
Differences between STV0042 and STV0056
Video
Audio
Others
Clamped Video Inputs
Clamped Video Outputs
Audio De-emphasis
Audio Noise Reduction
Auxillary Inputs
Auxillary Outputs
I2C Addresses
Digital I/O
22kHz Tone Generator
STV0042
2
2
50/75µs
L+ R
1
1
06
No
Pin 13
STV0056
4
3
50/75µs and J17
Panda
2
2
06 or 46
1
Pin 16 or/and Pin 29
Comments
See Note 1
See Note 2
See Note 3
Notes : 1. One of STV0056 video output feature a DC level output (black level adjust)
2. With the STV0042 the input signal which is used to control the noise reduction circuit is (L + R). With the STV0056, there are
2 independants noise reduction circuits, one for left, one for right.
3. With the STV0056, the I2C bus address can be selected by connecting the HA pin either to VDD or to GND.
3/37
Share Link: 