MX93000SC View Datasheet(PDF) - Macronix International

Part Name

Description

Manufacturer

MX93000SC

Special Codec

Macronix International 

MX93000

FUNCTIONAL DESCRIPTION

PCM CODEC :

This block includes A/D & D/A converters and all of the digital filters.

A/D & D/A converters:

which are implemented with 2nd-order sigma-delta modulation. Output formats are A-Law/u-Law/16-bit linear,

where u/A laws are of CCITT specifications and the 16-bit linear data can get 14-bit resolution and higher linearity

than that of u/A law.

Digital filters :

For the purpose of A/D out-of-band noise filtering and D/A image attenuation, digital filters are implemented on

the same chip.

The digital input applied to D/A converter can not be a dc signal other than idle (bits all zero), as limit cycles in

the digital modulator at a level of -70 dBm will present at the analog output.

POWER MANAGEMENT :

The MX93000 supports the automatic power-down control and power supply detection. This function will work well

even under 3V power supply.

Regarding the power_down procedure please refer to register 4 description for details.

POWER_LOW/BATTERY_LOW detectors : active low

2 comparators and references are used to check whether POWER_LOW/BATTERY_LOW or not. The

relationship between POWER_ON_RESET and POWER_LOW/BATTERY_LOW is as the following table:

(I) POWER_LOW (PDN\)

(I) BATTERY_LOW (BAT\)

0 011

0 101

(0)POWER_ON_RESET (PRST) 0 1 1 1

LINE DRIVER :

Not only support the programmable gain from 0 to 22.5 dB with 16 steps and 1.5 dB/step, but also fully differentially

drive -5 dBm power over 300 ohms. If switches SWE , SWJ , and SWK are opened, then the line driver will be

muted to -70dB automatically. In addition, when SWJ or SWK are turned on, there are loss at the line driver output

due to single-ended to fully-differential transform.

LINE_IN BUFFER :

Buffer stage with selection of echo cancellation path or not. For the echo cancellation path, 3-6 dB cancellation

can get it.

PROGRAMABLE GAIN CONTROL (PGA) :

It supports 0 to 22.5 dB gain with 16 steps and 1.5dB/step. The gain value is controlled separately by 3 registers,

where different input signal paths will have a different gain value, and when the input path is changed, the

respective register value will keep no change.

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