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PDF CXA2149Q Data sheet ( Hoja de datos )
| Número de pieza | CXA2149Q | |
| Descripción | US Audio Multiplexing Decoder | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA2149Q
I2C-Bus-Compatible Audio/Video Switch
For the availability of this product, please contact the sales office.
Description
The CXA2149Q is a video and audio switch IC
64 pin QFP (Plastic)
featuring I2C bus compatibility for TV’s. The IC has
input pins that are compatible with the SCART
protocols. It offers other features such as an
electronic mute function with switching noise
reduction (zero cross detection), electronic volume
control, automatic SYNC pulse detection, and group
delay control.
Features
• 3 CVBS inputs.
• 2 CVBS outputs.
• Group delay control on TV and CVIN1.
• SYNC ID on TV and CVIN1.
• 3 Y/C inputs.
• 2 Y/C outputs.
• 6 L/R/2 inputs.
• 3 L/R/2 outputs.
• Mode inputs compatible with the SCART protocol.
• 3 Y/C mixer circuits.
• Audio muting via software control.
• External muting input.
• Audio switching noise elimination circuit.
• Volume adjustment via software control on L/R
channel 3.
• Wide band video amplifiers (20 MHz, –3 dB).
• Wide audio dynamic range (3 Vrms typ)
• Serial control via I2C bus.
• Separate control of video and audio switches.
• High impedance maintained by I2C lines (SDA,
SCL) even when power is off.
• Configurable dual slave address 90/92.
• I2C bus 5 and 3.3 V compatible.
Absolute Maximum Ratings
(Ta=25 °C unless stated)
• Supply voltage
VCC 12 V
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 900 mW
Operating Conditions
• Supply voltage
• Typical supply current
• Operating temperature
VCC
Topr
9+/–0.5
75
–20 to +75
V
mA
°C
Applications
TV’s
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
—1—
E99946A9Y-TE
1 page  
CXA2149Q
Pin Pin
Symbol
No voltage (V)
Equivalent circuit
VCC
7 RGD1
3 RGD4
4.5
0.5m
7
3
Description
Group delay output to external
filter.
6 RGD2
4 RGD3
4.5
VCC
1.7k
6
4
Group delay inputs from external
filter.
1 REXT
1.7
44 DVCC
59 VVCC1
12 VVCC2
21 AVCC
42 DGND
57 VGND1
48 VGND2
31 AGND
9
0
VCC
3.8V
1
Pin connection for 39 kΩ group delay
setting resistor. Pin voltage is group
delay control dependent.
Digital supply.
Video supply.
Video supply.
Audio supply.
Digital ground.
Video ground.
Video ground.
Audio ground.
—5—
5 Page 
CXA2149Q
Video System Notes
1. 200 kHz is taken to be 0 dB for the purpose of this measurement. Where applicable, the group delay
function will be turned off to make this measurement.
2. Weighted using CCIR567.
3. This group delay characteristic, figure 1, is for the B, G specifications. It does not take into account the
input and output delays inherent within the AV switch.
4. The sync detection circuits operate on the video sources that have been switched into the TV and CVIN1
channels, respectively.
The internal SYNC discriminator circuit functions in the following way. The SYNC tip of the incoming video
input is clamped to a fixed level and the signal is then compared in magnitude with an internal threshold
voltage. If the signal is smaller than the threshold level the IC determines that the SYNC does not exist.
Conversely, if the signal is found to be greater than the threshold then the duty cycle of signal is passed to
the duty discrimination circuit. The discriminator circuit will identify whether the duty cycle of the signal is
above 91 % at which point SYNC is detected, or below 84 % when SYNC is not detected.
To prevent occasional video disturbances such as IF noise from the tuner causing malfunctioning of the
SYNC detector, a time constant of approximately 14 line periods is applied during which the status of the
SYNC detection is maintained.
—11—
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet CXA2149Q.PDF ] | |
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