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PCM4202 Questions

PCM4202 Questions. Q1 Rin of Analog-input is 3Kohm from the PCM4202 data sheet p4, and customer measured the Rin(between Vin+/Vin-) by Tester* as Fig1-(c) , result shows 6Kohm ( 3Kohm x 2) and customer says that data sheet description is confirmed…..

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PCM4202 Questions

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  1. PCM4202 Questions Q1 Rin of Analog-input is 3Kohm from the PCM4202 data sheet p4, and customer measured the Rin(between Vin+/Vin-) by Tester* as Fig1-(c) , result shows 6Kohm ( 3Kohm x 2) and customer says that data sheet description is confirmed….. Is this reasonable? If No, would you please let us know the measuring method of Rin in the data sheet? * Note that power is ON (Vcc=5V/VDD=3.3V) when measuring the Rin by Tester Q2 When Customer had directly insert 5V or 0V as Fig1-(a)(b), customer seen 5V or 0V in the portion of VIN+ and also VIN- . Is this reasonable? In the data sheet p13, there are description that “The PCM4202 analog inputs are internally biased to approximately VCC/2.”,,, but Cusomer’s test result does not show that. In case of Fig-1-(a)(b), Vcom is Hi-Z ?? ( Fig2-(b) switch is OFF? )

  2. VCC=5V VDD=3.3V VIN+ 5V 10K PCM4202 VIN- 5V is seen Fig1-(a) VCC=5V VDD=3.3V Fig1-(b) VIN+ 0V (GND) 10K PCM4202 Open Open VIN- 0V is seen Fig1-(c) VCC=5V VDD=3.3V Tester Tester shows “6kohm” VIN+ PCM4202 VIN-

  3. Fig2-(a) Block Diagram(PCM4202D/S) Fig2-(b) Block Diagram (Customer’s Guess) Delta-Sigma Modulator VINR+ 3Kohm Switch ? Open 3Kohm VINR- VCOM=Vcc/2

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