CDB44L11
CDB44L11 Datasheet
CDB44L11
| Part | Datasheet |
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CDB44L11 |
CDB44L11 (pdf) |
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| CDB44L11 Evaluation Board for the CS44L11 Features 23 mW/Channel into 16 at V Variable power supplies from V to V Digital bass boost and treble boost Programmable digital volume control Short circuit protection >90% amplifier efficiency The CDB44L11 is an excellent means to quickly demonstrate the CS44L11 Cirrus Digital Power Headphone Amplifier IC. Analysis requires only a digital signal source and an analog signal analyzer. As shown below, the CS44L11 takes PCM digital audio input and converts it to a PWM output. This 16-pin TSSOP IC provides volume up/down, treble boost, bass boost and mute functions via push buttons and a micro controller using an interface. A RS232 interface is provided for programming the micro controller. The CS8420 is a receiver and sample rate converter. It takes in the S/PDIF at a range of input sample rates and generates a PCM output signal at a fixed sample rate. The low pass filter removes high frequency components from the output PWM signal effectively converting it from digital to analog. ORDERING INFORMATION CDB44L11 Demonstration Board MCLK Clock Divider LRCK and SCLK S/PDIF IN CS8420 CS44L11 Control Buttons 8 LED Indicators Low Pass Filter Low Pass Filter 16 Headphones Copyright Cirrus Logic, Inc. 2004 All Rights Reserved APR ‘04 DS640DB1 1 CDB44L11 TABLE OF CONTENTS CDB44L11 SYSTEM OVERVIEW 3 SCHEMATIC DESCRIPTIONS 3 LIST OF FIGURES Figure CS44L11 PWM Headphone Amplifier 10 Figure CS8420 S/PDIF Receiver and Sample Rate 11 Figure 12 Figure Power Supply 13 Figure Assembly Drawing 14 Figure Top Layer 15 Figure Bottom Layer 16 LIST OF TABLES DS640DB1 CDB44L11 CDB44L11 SYSTEM OVERVIEW The CDB44L11 is an excellent means of quickly demonstrating the CS44L11. The CS8420 digital audio interface receiver provides an interface to digital audio sources including the majority of digital audio test equipment. SCHEMATIC DESCRIPTIONS CS44L11 Headphone Monitor and Output Filter The CS44L11, shown in Figure 1, can accept sampling frequencies varying from 8 kHz to 96 kHz and can produce a PWM frequency ranging from 8 X Fs to 48 X Fs refer to CS44L11 datasheet . In this design the 8 X Fs mode is used with a kHz sample frequency Fs , which will result in a 386 kHz PWM switching frequency. As shown in Figure 1, L3, L4, C29, and C30 form the 2nd order low pass LC filter for the output audio. The following equations show how to calculate the filter values: Cfilter = / * fc *RL Lfilter = * RL / * fc where fc = desired -3 dB frequency of the filter RL = the nominal speaker load impedance If you choose fc = 35 kHz, RL= 16 W, then: Cfilter = / * 35000 * 16 = µF Lfilter = * 16 / * 35000 = µH Choosing practical component values: Cfilter = µF Lfilter = 100 µH Output distortion is directly related to the inductor quality. The inductors should have a saturation current of at least 150 mA for RL= 16 This design uses the Central Technologies CTGSR74B 100 µH inductors for the output filter. 220 µF capacitors are used to block any DC signal from being heard at the output. For maximum output power, low ESR capacitors should be used on the output. DS640DB1 CDB44L11 |
| More datasheets: B33364A5156J050 | B33364A5256J050 | TN01 016 0005 2 | AIMB-267G2-KSA1E | AIMB-267VG-KSA1E | 1700000447 | 177200095300012 | 177200133302005 | 177200133301002 | 177200133300002 |
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