Audio Solutions Guide, 1Q 2007

14
➔
Products: Audio Amplifiers
Volume Controls
Stereo Audio Volume Control
PGA2320
www.ti.com/sc/device/PGA2320
Analog volume control often carries a great advantage because, unlike
digital volume control, the noise inherent in any prior processing (ADC,
DSP, DAC) decreases along with the audio content. TI’s analog volume
controls range from ±15-V devices like the PGA2310 and PGA2320 to
multichannel ±5-V devices such as the PGA4311.
The ±15-V devices are typically used on line inputs or as part of an
analog signal chain, whereas ±5-V devices are often used after a DAC
to attenuate typical output levels.
The PGA2320, TI's latest PGA volume control, is a technical advancement
over its predecessor, the PGA2310. Using a new TI process, the
PGA2320 continues to offer ±15-V supply rails in a pin-for-pin package
with
Volume
a lower THD+N
Controls
and a lower price.
Key Features
• ±15-V supply rails allow large swing signals to be attenuated.
• Pin-for-pin compatibility with the PGA2310 enables an easy upgrade
path.
• Simple SPI control method for integration into DSP or microcontroller
systems.
• 0.5-dB steps allow for accurate attenuation.
Applications
• Audio amplifiers
• Mixing consoles
• Multitrack recorder
• AV amplifier
To Know More
• For a complete list of Volume Controls, see the Selection Guide on
page 33.
Volume Controls
PGA2320
Performance
PGA2311
• 120-dB dynamic
range
• THD+N at 1 kHz = 0.0002%
• 31.5-dB to -95.5-dB
attenuation
• +/-5-V supplies
PGA4311
• 4-channel version
of PGA2311
• 120-dB dynamic range
• THD+N at 1 kHz =
0.0002%
• 31.5-dB to -95.5-dB
attenuation
• +/-5-V supplies
PGA2310
• 120-dB dynamic
range
• THD+N at
1 kHz = 0.0004%
• 31.5-dB to -95.5-dB
attenuation
• +/-15-V supplies
• Improved THD+N
• Same pinout as
PGA2310
FEATURED PRODUCT
Key
Line Input/Output
Attenuation up to 27 Vpp
DAC Output Attenuation
DAC output level ~2 Vrms
Vcc Range + Integration
Audio Solutions Guide Texas Instruments 1Q 2007