HMP9701 Просмотр технического описания (PDF) - Intersil

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HMP9701

AC’97 Audio Codec

Intersil 

HMP9701

Typical Application Schematic Notes

1. A note about the capacitors used for coupling externally

input audio or for outputting audio externally:

The capacitance value and the associated circuit imped-

ances will determine the lower frequency cutoff of the au-

dio signal. The designer must determine what the circuit

impedances are and select the coupling capacitor value

accordingly. Ceramic types (over electrolytic) are highly

recommended.

2. The crystal should be a parallel resonant type, frequency is

24.756MHz, initial room temperature tolerance of 50ppm,

and a load cap of about 16-20pF.

3. It is recommended to decouple each analog and digital

power supply pin with a combination of a small value and

large value bypass capacitor. The large value capacitor

should be either a tantalum or aluminum electrolytic type.

4. Locate all decoupling capacitors CLOSE to their associat-

ed pins on the codec.

5. Please note that all analog inputs and outputs of the

HMP9701 codec are at the DC level of VREF and require

AC coupling to zero biased signal sources and destina-

tions.

6. Keep all analog input and output traces as short as possi-

ble, prevent any coupling from adjacent digital lines.

7. For optimum performance, it is preferred to layout sepa-

rate analog and digital ground planes, joining them togeth-

er at a point directly adjacent to the codec (i.e., directly

under it). This case is true even if the designer is using a

single supply for the codec; the single supply would have

adequate decoupling / isolation between the digital and an-

alog sections.

8. When using an external clock source, please feed that sig-

nal into XTL_OUT (not XTL_IN) and leave XTL_IN uncon-

nected. Also, do not use any capacitors between XTL_IN

and GND or XTL_OUT and GND in that mode.

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