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PDF CDB44L11 Data sheet ( Hoja de datos )
| Número de pieza | CDB44L11 | |
| Descripción | Evaluation Board | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CDB44L11
Evaluation Board for the CS44L11
Features
23 mW/Channel into 16 Ω 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 Ω
Headphones
http://www.cirrus.com
©Copyright Cirrus Logic, Inc. 2004
(All Rights Reserved)
APR ‘04
DS640DB1
1
1 page  
CDB44L11
switching current. In most designs this may be omitted due to other system components loading
the supply line and dissipating the current. The resistive load is only used to simulate a circuit
load.
In the CS44L11, the output MOSFETs directly switch between ground and VA_HP, therefore the
performance of the audio output from the amplifier is adversely affected any disturbance on the
power rails. To get the best performance power supply characteristics and power supply de-cou-
pling are critical.
Dynamic Range will be affected by switching noise. To reduce switching noise large value power
supply bypass capacitors must be used. This circuit uses a 0.1 µF and 1.0 µF ceramic capacitor
as well as a 100 µF low ESR tantalum capacitor between the VA_HP supply rail and ground. Op-
timally these should be placed as close to the CS44L11 pins 12 and 13 as possible. If a DC-DC
converter is used in the system its switching frequency should be locked to the CS44L11 PWM
switching frequency to reduce switching noise.
Power supply source impedance has a direct affect on the output distortion. A DC-DC converter
is a very low impedance source and will offer the best THD+N performance. Using a linear power
supply offers the next lowest impedance, while running directly from batteries to the VA_HP pins
offers the highest impedance and therefore the highest distortion.
A 47 µH inductor (L1) is used on the digital power supply of the CS44L11 to suppress noise. This
may be omitted if system noise is not an issue in your design.
DS640DB1
5
5 Page 
CDB44L11
DS640DB1
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet CDB44L11.PDF ] | |
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