CDB44800

6Channel Digital Amplifier Controller

General Description

The CS44600 is a multi-channel digital-to-PWM Class D audio system controller including interpolation, sample rate conversion, half- and full-bridge PWM driver outputs, and power supply rejection feedback in a 64-pin LQFP pack age.The architecture uses a direct-to-digital approach that maintains digital signal integrity to the final output filter, minimizing analog interference effects which negatively affect system performance.

The CS44600 integrates on-chip digital volume control, peak detect with limiter, de-emphasis, and 7 GPIO’s, allow ing easy interfacing to many commonly available power stages. The PWM amplifier can achieve greater than 90% efficiency. This efficiency provides for smaller device package, less heat sink requirements, and smaller power supplies.

The CS44600 is ideal for audio systems requiring wide dynamic range, negligible distortion and low noise, such as A/V receivers, DVD receivers, digital speaker and automotive audio systems.

Features

♦ > 100 dB Dynamic Range - System Level

♦ < 0.03% THD+N @ 1 W - System Level

♦ 32 kHz to 192 kHz Sample Rates

♦ Internal Oscillator Circuit Supports 24.576 MHz to 54 MHz Crystals

♦ Integrated Sample Rate Converter SRC

   – Eliminates Clock Jitter Effects

   – Input Sample Rate Independent Operation

♦ Power Supply Rejection Realtime Feedback

♦ Spread Spectrum Modulation - Reduces EMI

♦ PWM Popguard® for Single-Ended Mode

♦ Eliminates AM Frequency Interference

♦ Programmable Load Compensation Filters

♦ Support for up to 40 kHz Audio Bandwidth

♦ Digital Volume Control with Soft Ramp

   – +24 to -127 dB in 0.25 dB Steps

♦ Per Channel Programmable Peak Detect and Limiter

♦ SPI™ and I²C® Host Control Interfaces

♦ Separate 2.5 V to 5.0 V Serial Port and Host Control Port Supplies