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PGA2311PA Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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PGA2311PA Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 17 page PGA2311 SBOS218A – DECEMBER 2001 – REVISED JUNE 2002 www.ti.com 7 GENERAL DESCRIPTION The PGA2311 is a stereo audio volume control. It may be used in a wide array of professional and consumer audio equipment. The PGA2311 is fabricated in a sub– micron CMOS process. The heart of the PGA2311 is a resistor network, an ana- log switch array, and a high–performance op amp stage. The switches are used to select taps in the resis- tor network that, in turn, determine the gain of the am- plifier stage. Switch selections are programmed using a serial control port. The serial port allows connection to a wide variety of host controllers. Figure 1 shows a functional block diagram of the PGA2311. 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 exter- nal signals. Once this has been completed, the gain byte value for both the left and right channels are set to 00HEX, or the software MUTE condition. The gain will remain at this setting until the host controller programs new set- tings for for each channel via the serial control port. If during normal operation the power supply voltage drops below ±3.2V, the circuit enters a hardware MUTE state. A power-up sequence will be initiated if the power supply voltage returns to greater than ±3.2V. ANALOG INPUTS AND OUTPUTS The PGA2311 includes two independent channels, re- ferred to as the left and right channels. Each channel has a corresponding input and output pin. The input and out- put pins are unbalanced, or referenced to analog ground (either AGNDR or AGNDL). The inputs are named VINR (pin 9) and VINL (pin 16), while the outputs are named VOUTR (pin 11) and VOUTL (pin 14). The input and output pins may swing within 1.25V of the analog power supplies, VA+ (pin 12) and VA– (pin 13). Given VA+ = +5V and VA– = –5V, the maximum input or output voltage range is 7.5Vp-p. For optimal performance, it is best to drive the PGA2311 with a low source impedance. A source impedance of 600 Ω or less is recommended. Source impedances up to 2k Ω will cause minimal degradation of THD+N. Please refer to the “THD+N vs Source Impedance” plot in the Typical Characteristics section of the datasheet. Figure 1. PGA2311 Block Diagram. |
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