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STAC9271 数据表(PDF) 21 Page - Integrated Device Technology |
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STAC9271 数据表(HTML) 21 Page - Integrated Device Technology |
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21 / 223 page  STAC9271/9272/9273/9274 10-CHANNEL HIGH DEFINITION AUDIO CODEC PC AUDIO IDT™ 10-CHANNEL HIGH DEFINITION AUDIO CODEC 21 STAC9271/9272/9273/9274 V 1.0 MARCH2007 IDT CONFIDENTIAL 3. DETAILED DESCRIPTION 3.1. Universal JacksTM IDT’s Universal JacksTM technology allows for the greatest flexibility in board design and implemen- tation. For the STAC927x family the Universal JacksTM capabilities are as follows1: • Ports A, B, and D support2: • Headphone Out • Line Out • Line In • Mic with 0/10/20/30/40 dB Mic boost3 • Ports C, E, F, G, H support2: • Line Out • Line In • Mic with 0/10/20/30/40 dB Mic boost3 • Ports G & H do not have VrefOut Support Note1: On the STAC927x family, only one function can be selected on each pin pair at a time. For example, a pin pair cannot be configured as an input and output at the same time. Configuration can be changed at any time. Note2: Three Headphones should not be used simultaneously. Performance degradation will occur when using 2 Headphones simultaneously. See electrical specs for details. Note3: When the 40dB mic boost feature is enabled, additional gain increases greater than 6dB may result in significant audio quality degradation of the microphone audio input. In particular, when the 40dB MIC boost is active, the SNR, THD+N and DC offset will significantly degrade regardless of the input signal level. 3.1.1. Audio Jack Presence Detect SENSE_A pin is used to detect the presence of plugs in ports A, B, C, and D. SENSE_B pin is used to detect the presence of plugs in ports E, F, G, ad H. Refer to the reference design for port detect circuitry. Select the precision of the resistors used as follows: Table 1. Impedance Sense AVDD Nominal Voltage (+-5%) Resistor Tolerance Sense A (If Port D is used) Resistor Tolerance Sense A (If Port D is not used) Resistor Tolerance Sense B (If Port H is used) Resistor Tolerance Sense B (If Port H is not used) 5V 1% 1% 1% 1% 4.5V 1% 1% 1% 1% 4V 0.50% 1% 0.50% 1% 3.3V 0.10% 1% 0.10% 1% |
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