MSM7566 Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM7566

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7566/7567

VFRO

Receive filter output.

The output signal has an amplitude of 2.4 VPP above and below the signal ground voltage (SG)

when the digital signal of +3 dBmO is input to PCMIN and can drive a load of 20 kW or more.

For driving a load of 20 kW or less, connect a resistor of 20 kW or more should be connected

between the pins VFRO and PWI.

When adding the frequency characteristics to the receive signal, refer to the application example.

During power saving mode, the output of VFRO is at the voltage level of SG. During power down

mode, the output is in a high impedance state.

PWI, AOUT+, AOUT–

PWI is connected to the inverting input of the receive driver. The receive driver output is

connected to the AOUT– pin. Therefore, the receive level can be adjusted with the pins VFRO,

PWI, and AOUT–. When the PWI pin is not used, the PWI pin to the AOUT– pin, and leave open

the pins AOUT– and AOUT+. The output of AOUT+ is inverted with respect to the output of

AOUT–. Since the signal from which provides differential drive of an impedance of 1.2 kW +55

nF, these outputs can directly be connected to a receiver of handset using a piezoelectric

earphone.

Refer to the application example.

VI

Receive Filter

VFRO R6

PWI

R7

–

SG +

AOUT–

VO ZL

–

SG +

AOUT+

R6 > 20 kW

ZL ≥ 2.4 kW

Gain = VO/VI = 2 ¥ R7/R6 £ 2

The other external signals can be output from AOUT+ and AOUT– during power saving, since

these driver amplifiers are in the operational state. During power down mode, the output of

AOUT+ and AOUT– is at the voltage level of SG through high impedance.

The electrical driving capability of the AOUT– pin and AOUT+ pin is ±1.3 V maximum. The

output load resistor has a minimum value of 1.2 kW.

If an output amplitude less than ±1.3 V is allowed, these outputs can drive a load resistance less

than that described above. For more details, refer to SINGLE POWER SUPPLY PCM CODEC

APPLICATION NOTE.

VDD

Power supply for +2.7 V to +3.8 V. (Typically 3.0 V)

PCMIN

PCM signal input.

A serial PCM signal input to this pin is converted to an analog signal in synchronization with the

RSYNC signal and BCLOCK signal.

The data rate of the PCM signal is equal to the frequency of the BCLOCK signal.

The PCM signal is shifted at a falling edge of the BCLOCK signal and latched into the internal

register when shifted by eight bits.

The start of the PCM data (MSD) is identified at the rising edge of RSYNC.

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