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AD1845 7. The CS4231 requires 2 crystal inputs, 24.575 MHz and 16.9344 MHz. The AD1845 requires only 1 input of 24.576 MHz or can be driven from OSC or other external clocks.

COMPATIBILITY WITH CS4231

1. The CS4231 requires a 1000 pF NPO type capacitor on Pins 26 and 31. The AD1845 requires a 1 µF capacitor on filter Pins 26 and 31. To achieve compatibility with the AD1845, use pad spacing that will accommodate either 1000 pF NPO capacitors for the CS4231 and the CS4248 or the 1 µF capacitors for the AD1845. 2. The AD1845 requires the input antialiasing filters for the ADCs (refer to Figures 25 and 26). The CS4231 can use the same filters with no degradation in performance. For compatibility it is suggested that the filters be added. 3. The CS4231 does not require the power pins (VDD) 24, 45, and 54, or the ground pins (GNDD) 25, and 44. It is suggested that the appropriate power/ground pin connections be made. This will not affect the performance of the CS4231.

8. The CS4231 does not contain the INITD bit. 9. The CS4231 minimum RIN = 20 kΩ. The AD1845 minimum input resistance is 10 kΩ. 10. The AD1845 is designed to support “little endian” formats. The CS4231 supports both “big endian” and “little endian” formats. 11. The AD1845 does not include hardware for compressing and decompressing ADPCM data. Analog Devices offers Windows based software applets for using ADPCM formats with the AD1845.

4. The CS4231 does not provide software programmable power-down modes. 5. The CS4231 does not have the ability to mix the MIC input with the DAC output. 6. The CS4231 does not contain a Variable Sample Frequency Generator and cannot change sample rates “on the fly.” The CS4231 and CS4248 require entering MCE to change the sample rate. The AD1845 can change the sample rate without entering MCE. The AD1845’s 50,000 selectable sample rates are not available on the CS4231. The Variable Sample Frequency Generator reduces clicks and pops encountered in many game applications.

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REV. B


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