Features: Full-Automatic Multi-Standard Demodulation
B / G / I / L / M / N / D / K Standards
Mono AM and FM
FM 2-Carrier (German and Korean Zweiton) and NICAM
Multi-Channel Capability
3 I²S digital inputs, S/PDIF (in/out)
5.1 analog outputs
Dolby® Pro Logic®
Dolby® Pro Logic II®
Sound Processing
ST royalty-free processing: ST WideSurround, ST OmniSurround, ST Dynamic Bass, SRS® WOW™, SRS® TruSurround XT™ which is Virtual Dolby® Surround and Virtual Dolby® Digital compliant
Independent Volume / Balance for Loudspeakers and Headphone
Loudspeakers: Smart Volume Control (SVC), 5-band equalizer and loudness
Headphone: Smart Volume Control (SVC), Bass- Treble, Loudness and SRS® TruBass™
Analog Audio Matrix
4 stereo inputs
3 stereo outputs
THRU mode
Audio Delay for Audio Video Synchronization
Embedded stereo delay up to 120 ms for lip-sync function (up to 180 ms for tuner input)
Independent delay on headphone and loudspeaker channels
Application Analog and digital TV with virtual surround sound
Analog and digital TV with multi-channel surround sound
DVD and HDD recorders
"Palm size" portable TV
Pinout
Specifications
|
Symbol |
Parameter |
Value |
Units |
|
VXX_18 |
Analog and Digital 1.8 V Supply Voltage
(VCC18_CLK1, VCC18_CLK2, VCC18_IF, VDD18, VDD18_CONV, VDD18_ADC)
|
2.5 |
V |
|
VXX_33 |
Analog and Digital 3.3 V Supply Voltage
(VCC33_SC, VCC33_LS, VDD33_IO1, VDD33_IO2, VDD33_CONV, VCC_NISO)
|
4.0 |
V |
|
HVCC |
Analog Supply High Voltage (VCC_H) |
8.8 |
V |
|
VESD |
Capacitor 100 pF discharged via 1.5 kΩ serial resistor (Human Body Model) |
4 |
kV |
|
TOPER |
Operating Ambient Temperature |
0, +70 |
|
|
TSTG |
Storage Temperature |
-55 to +150 |
|
DescriptionThe STV8257 is a multistandard TV sound demodulator and audio processor which integrates SRS® WOW™, SRS® TruSurround XT™, Dolby® Pro Logic®, Dolby® Pro Logic II®,Virtual Dolby® Surround (VDS) and Virtual Dolby® Digital (VDD) capability.
ST advanced algorithms such as ST OmniSurround, ST WideSurround, ST Dynamic Bass are also available in this audio sound processor. ST OmniSurround is a certified Dolby® algorithm for the Virtual Dolby® Digital (VDD) and the Virtual Dolby® Surround (VDS). When using VDD or VDS, either a Dolby® Digital or a Pro Logic® (or Pro Logic II®) decoder is mandatory respectively.
This chip STV8257 performs automatic multistandard analog TV stereo sound identification and demodulation (no specific I²C programming is required). STV8257 offers various audio processing functions such as equalization, loudness, beeper, volume, balance, and surround effects. STV8257 provides a cost-effective solution for analog and digital TV designs.
The STV8257 is perfectly suited to current and future digital TV platforms, based on audio/video digital chips (STD2000, (DTV100 platform) and the future WorldWide iDTV one chip) which include an internal digital decoder (MPEG, Dolby® Digital...). In the case where a Dolby® Digital decoder is embedded in the audio/video digital chip, Virtual Dolby® Digital could be obtained.
For the CTV100/120 platform, the STV8257 is offered as an alternative solution to the first-generation chassis that uses the STV82x6.
STV8257 Data Sheet
