DataSheet26.com

CDB44L11 PDF даташит

Спецификация CDB44L11 изготовлена ​​​​«Cirrus Logic» и имеет функцию, называемую «Evaluation Board».

Детали детали

Номер произв CDB44L11
Описание Evaluation Board
Производители Cirrus Logic
логотип Cirrus Logic логотип 

20 Pages
scroll

No Preview Available !

CDB44L11 Даташит, Описание, Даташиты
www.DataSheet4U.com
CDB44L11
Evaluation Board for the CS44L11
Features
23 mW/Channel into 16 at 2.4 V
Variable power supplies from 1.8 V to 2.4 V
Digital bass boost and treble boost
Programmable digital volume control
Short circuit protection
>90% amplifier efficiency
Description
The CDB44L11 is an excellent means to quickly demon-
strate the CS44L11 Cirrus Digital Power Headphone
Amplifier IC. Analysis requires only a digital signal
source and an analog signal analyzer.
I
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 I²C 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
I2S
4
CS44L11
Control
Buttons 8
uC
2
I2C
2
LED Indicators
5
Low Pass
Filter
Low Pass
Filter
16
Headphones
http://www.cirrus.com
©Copyright Cirrus Logic, Inc. 2004
(All Rights Reserved)
APR ‘04
DS640DB1
1









No Preview Available !

CDB44L11 Даташит, Описание, Даташиты
CDB44L11
TABLE OF CONTENTS
1. CDB44L11 SYSTEM OVERVIEW ............................................................................................ 3
2. SCHEMATIC DESCRIPTIONS ................................................................................................. 3
2.1 CS44L11 Headphone Monitor and Output Filter ................................................................ 3
2.2 Clocking ............................................................................................................................. 4
2.3 CS8420 Sample Rate Converter ....................................................................................... 4
2.4 Microcontroller ................................................................................................................... 4
2.5 Power Supplies and Level-Shifting .................................................................................... 4
3. OPERATION INFORMATION ................................................................................................... 6
3.1 Operating Instructions ........................................................................................................ 6
4. CONTROL FUNCTIONS ........................................................................................................... 7
4.1 Control Buttons .................................................................................................................. 7
4.2 LED Status ......................................................................................................................... 7
4.3 CS44L11 Initialization ........................................................................................................ 9
5. BILL OF MATERIALS ........................................................................................................... 17
6. REVISION HISTORY .............................................................................................................. 20
LIST OF FIGURES
Figure 1. CS44L11 PWM Headphone Amplifier ............................................................................ 10
Figure 2. CS8420 S/PDIF Receiver and Sample Rate Converter................................................. 11
Figure 3. Microcontroller................................................................................................................ 12
Figure 4. Power Supply ................................................................................................................. 13
Figure 5. Assembly Drawing ......................................................................................................... 14
Figure 6. Top Layer ....................................................................................................................... 15
Figure 7. Bottom Layer .................................................................................................................. 16
LIST OF TABLES
Table 1. Volume Status LED Decodes ............................................................................................ 8
Table 2. Treble/Bass Boost Status LED Decodes........................................................................... 8
Table 3. Initial CS44L11 Register Settings...................................................................................... 9
Table 4. Revision History .............................................................................................................. 20
2 DS640DB1









No Preview Available !

CDB44L11 Даташит, Описание, Даташиты
CDB44L11
1. CDB44L11 SYSTEM OVERVIEW
The CDB44L11 is an excellent means of quickly demonstrating the CS44L11. The CS8420 dig-
ital audio interface receiver provides an interface to digital audio sources including the majority
of digital audio test equipment.
2. SCHEMATIC DESCRIPTIONS
2.1 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 48.25 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 = 0.707 / (6.283 * fc *RL)
Lfilter = (1.414 * RL) / (6.283 * 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 = 0.707 / (6.283 * 35000 * 16) = 0.2009 µF
Lfilter = (1.414 * 16) / (6.283 * 35000) = 102.881 µH
Choosing practical component values:
Cfilter = 0.22 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
3










Скачать PDF:

[ CDB44L11.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
CDB44L11Evaluation BoardCirrus Logic
Cirrus Logic

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск