alc250-lf Realtek Semiconductor Corporation, alc250-lf Datasheet - Page 41

• Manufacturer Part Number: alc250-lf
• Description: Two-channel Ac?97 2.3 Audio Codec With Equalizer
• Manufacturer: Realtek Semiconductor Corporation

ALC250 DataSheet
9.4 CD Input
It is important to pay attention to differential CD input. Below is an example of differential CD input.
Example of differential CD input
9.5 Odd Addressed Register Access
The ALC250 will return “0000h” when odd-addressed and unimplemented registers are read.
9.6 Power-down Mode
It is important to pay special attention to the power down control register (index 26h), especially PR4 (powerdown AC-link).
9.7 Test Mode
To provide compatibility with AC’97 rev2.2, the ALC250 will float its digital output pins in both ATE and Vendor-Specific test
modes. Please refer to AC’97 rev2.2 section 9.2 for a detailed description of the test modes.
9.7.1 ATE In Circuit Test Mode
SDATA_OUT is sampled high at the trailing edge of RESET#. In this mode, the ALC250 will drive BIT_CLK, SDATA_IN,
EAPD and SPDIFO to high impedance.
9.7.2 Vendor Specific Test Mode
The Vendor Specific Test mode is no longer supported.
Two-Channel AC’97 2.3 Audio Codec
36
Rev1.3