MC145540 데이터 시트보기 (PDF) - Motorola => Freescale

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MC145540

ADPCM Codec

Motorola => Freescale 

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GENERAL DESCRIPTION

1.1 INTRODUCTION

The MC145540 ADPCM Codec is a single chip implementation of a PCM codec-filter and an ADPCM

encoder/decoder, and therefore provides an efficient solution for applications requiring the digitization

and compression of voiceband signals. This device is designed to operate over a wide voltage range,

2.7 to 5.25 V, and as such is ideal for battery powered as well as ac powered applications. The

MC145540 ADPCM Codec also includes a serial control port and internal control and status registers

that permit a microcontroller to exercise many built-in features.

The ADPCM Codec is designed to meet the 32 kbps ADPCM conformance requirements of CCITT

Recommendation G.721 and ANSI T1.301. It also meets ANSI T1.303 and CCITT Recommendation

G.723 for 24 kbps ADPCM operation, and the 16 kbps ADPCM standard, CCITT Recommendation

G.726. This device also meets the PCM conformance specification of the CCITT G.714 Recommenda-

tion.

1.2 FEATURES

Key features of the MC145540 ADPCM Codec include:

• Single 2.7 to 5.25 V Power Supply

• Typical 3 V Power Dissipation of 55 mW, Power Down of 0. 15 mW

• Differential Analog Circuit Design for Lowest Noise

• Complete Mu-Law and A-Law Companding PCM Codec/Filter

• ADPCM Transcoder for 64, 32, 24, and 16 kbps data rates

• Universal Programmable Dual Tone Generator

• Programmable Transmit Gain, Receive Gain, and Sidetone Gain

• Low Noise, High Gain, Three Terminal Input Operational Amplifier for Microphone Interface

• Push-Pull 300 Ω Power Drivers with External Gain Adjust for Receiver Interface

• Push-Pull 300 Ω Auxiliary Output Drivers for Ringer Interface

• Voltage Regulated Charge Pump to Power the Analog Circuitry in Low Voltage Applications

• Receive Side Noise Burst Detect Algorithm

MOTOROLA

MC145540

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