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User’s Manual
ECM-3612 User’s Manual
19
1.6.4 VIA VT1612A
The VIA VT1612A Audio Codec conforms to the AC'97 2.2 specification providing 18-bit
resolution performance. With 2 channel outputs the VIA VT1612A provides
high-performance stereo quality for headphones or speaker connections. Furthermore, an
integrated headphone amplifier with thermal shutdown reduces the need for further
external components. The VIA VT1612A includes analog mixer circuitry for stereo
enhancement to provide a pleasing 3D surround sound effect for stereo media. For a
completely digital audio path the VIA VT1612A includes an integrated IEC958 line driver for
S/PDIF compressed digital or LPCM audio out.
Four stereo and 2 mono audio inputs provided by the VIA VT1612A enable connections to
a wide range of audio inputs such as microphones, line inputs, and phone connections.
Sample rate converters in the VIA VT1612A can be adjusted in 1Hz increments providing
maximum recording manipulation capabilities, and hardware VU peak meters are provided
for PCM streams.
For maximum ease of integration the VIA VT1612A is designed with aggressive power
management to achieve low power consumption. When used with a 3.3v analog power
supply, the power consumption can be further reduced. The VIA VT1612A is available in a
small footprint 48-pin LQFP package. Typical applications of the VIA VT1612A include
integration into audio on motherboard solutions, add-in cards, and other audio subsystems
that require stereo I/O with S/PDIF digital outputs.
• 18-bit independent rate stereo ADC/DAC
• 18-bit stereo full duplex
• 1 Hz resolution VSR (Variable Sampling Rate)
• Integrated IEC958 line driver for S/PDIF
• S/PDIF compressed digital or LPCM audio out
• Hardware VU peak meters for PCM streams
• 2 stereo, 2 mono analog line-level inputs
• Alt. Line-level output with volume control
• AC'97 2.2 S/PDIF extension compliant codec
• 3D stereo expansion for simulated surround
• Headphone Amplifier with Thermal Protection
• Exceeds Microsoft® WHQL logo requirements
• 48-pin LQFP small footprint package
• Low Power consumption mode
• 3.3V digital, 3.3 or 5V analog power supply