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LM4935RLEVAL 데이터시트(PDF) 21 Page - Texas Instruments

부품명 LM4935RLEVAL
상세설명  Audio Power Amplifier Series Audio Sub-System with Dual-Mode Stereo Headphone & Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM4935RLEVAL 데이터시트(HTML) 21 Page - Texas Instruments

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MCL
K
I2S_CL
K
PCM_CL
K
PCM
Interface
I2S Interface
Stereo DAC
Mono ADC
PLL
% Q
% R
C
B
A
From on chip 12 MHz oscillator
USE_ONCHIP_OSC
(to DET, PMC & SAR)
LM4935, LM4935RLEVAL
www.ti.com
SNAS296D – OCTOBER 2005 – REVISED MARCH 2006
The LM4935 is designed to work from a 12.000 MHz or 11.025 MHz clock at point A. This is used to drive
the power management and control logic. Performance may not meet the electrical specifications if the
frequency at this point deviates significantly beyond this range.
Figure 4-9. LM4935 Clock Network
4.2.4
COMMON CLOCK SETTINGS FOR THE DAC & ADC
The DAC has an over sampling rate of 125 but requires a 250*fs clock at point B. This allows a simple
clocking solution as it will work from 12.000 MHz (common in most systems with Bluetooth or USB) at 48
kHz exactly, the following table describes the clock required at point B for various clock sample rates in
the different DAC modes:
Table 4-4. Common DAC Clock Frequencies
DAC Sample Rate (kHz)
Clock Required at B (MHz)
8
2
11.025
2.75625
12
3
16
4
22.05
5.5125
24
6
32
8
44.1
11.025
48
12
The ADC has an over sampling ratio of 125 so the table below shows the required clock frequency at
point C.
Copyright © 2005–2006, Texas Instruments Incorporated
Application Information
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Product Folder Links: LM4935 LM4935RLEVAL



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