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12<br />
➔<br />
Products: <strong>Audio</strong> Amplifiers<br />
Professional <strong>Audio</strong> Microphone Preamplifiers<br />
Digitally Controlled Microphone Preamplifier IC<br />
PGA2500<br />
www.ti.com/sc/device/PGA2500<br />
All audio production requires transferring acoustic information into an<br />
electronic medium. To avoid interference and help process signals<br />
through analog and digital circuitry, gain is added to the microphone<br />
signal to increase the ratio between the audio signal itself and the<br />
noise floor inherent in the circuit to follow. A mic preamp typically<br />
brings the tiny µV microphone signal up to line level or higher for<br />
processing.<br />
Microphones usually have balanced outputs to help remove external<br />
interference from the tiny signals being transferred. Mic preamps<br />
should be matched so that both sides of the differential signal are<br />
given equal gain while rejecting any common mode signals. When the<br />
whole mic preamp is in one piece of silicon then all parts can be<br />
matched so that they track equally with temperature, maintaining balance<br />
in almost all conditions.<br />
Combining leading analog circuitry with digital control, the PGA2500 is<br />
the world’s only digitally controlled mic preamp IC, enabling designers<br />
to create remotely controlled microphone preamps with higher<br />
performance in a smaller space.<br />
Key Features<br />
• Fully differential analog I/O enables low levels of interference and<br />
seamless connection to differential ADCs.<br />
• Four general-purpose outputs allow the control of signal chain<br />
switches and relays for phase, pad, phantom and more.<br />
• Includes DC servo and Vcom input for minimum DC offset error and<br />
direct connection to ADCs.<br />
Applications<br />
• Microphone preamplifiers<br />
• Digital mixers and recorders<br />
• Digital snakes<br />
To Know More<br />
• For a complete list of Microphone Preamplifiers,<br />
see the Selection <strong>Guide</strong> on page 36.<br />
Professional <strong>Audio</strong> Analog Microphone Preamplifiers<br />
PGA2500<br />
Performance<br />
INA217<br />
• Low noise 1.3 nV Hz<br />
• Gain setting with<br />
external resistor<br />
• Wide supply range<br />
+9 V to ±25 V<br />
INA163<br />
• Low noise 1 nV Hz<br />
• Gain setting with<br />
external resistor<br />
• Wide supply range<br />
+9 V to ±25 V<br />
• Surface-mount package<br />
SO-14<br />
• 0 dB, 10 dB to 65 dB<br />
of programmable gain<br />
in 1-dB steps<br />
• Fully differential I/O<br />
• Four general-purpose<br />
digital outputs<br />
FEATURED PRODUCT<br />
Key<br />
Digital Control<br />
Analog Control<br />
Level of Integration<br />
<strong>Audio</strong> <strong>Solutions</strong> <strong>Guide</strong> Texas Instruments <strong>1Q</strong> <strong>2007</strong>
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