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PGA4311UA Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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PGA4311UA Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 15 page PGA4311 SBOS230A – MARCH 2002 – REVISED JUNE 2002 www.ti.com 6 TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VA+ = +5V, VA– = –5V, VD+ = +5V, RL = 100kΩ, CL = 20pF, BW measure = 10Hz to 20kHz, unless otherwise noted. (NOTE: All plots taken with PGA4311 A–Grade.) GENERAL DESCRIPTION The PGA4311 is a four-channel audio volume control. It may be used in a wide array of professional and consumer audio equipment. The PGA4311 is fabricated in a sub-micron CMOS process. The heart of the PGA4311 is a resistor network, an analog switch array, and a high-performance op amp stage. The switches are used to select taps in the resistor network that, in turn, determine the gain of the amplifier stage. Switch selections are programmed using a serial control port. The serial port allows connection to a wide variety of host controllers. See Figure 1 for a functional block diagram of the PGA4311. POWER–UP STATE On power up, “power-up reset” is activated for about 100ms during which the circuit is in hardware MUTE state and all internal flip-flops are reset. At the end of this period, the offset calibration is initiated without any external signals. Once this has been completed, the gain byte value for all channels are set to 00HEX, or the software MUTE condi- tion. The gain will remain at this setting until the host con- troller programs new settings for for each channel via the serial control port. |
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