 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LM4935RLEVAL Datasheet(PDF) 27 Page - Texas Instruments |
|
|
|||||||||||||||||||||||||||||
LM4935RLEVAL Datasheet(HTML) 27 Page - Texas Instruments |
|
|
27 / 91 page  LM4935, LM4935RLEVAL www.ti.com SNAS296D – OCTOBER 2005 – REVISED MARCH 2006 4.2.11 ADC_2 CONFIGURATION REGISTER This register is used to control the LM4935's audio ADC. Table 4-12. ADC_2 (0x07h) Bits Field Description 0 ULAW/ALAW If COMPAND is set then the data across the PCM interface to the DAC and from the ADC is companded as follows: ULAW/ALAW Commanding Type 0 µ-law 1 A-law 1 COMPAND If set the 16 bit PCM data from the ADC is companded before the PCM interface and the PCM data to the DAC is treated as companded data. 2 ADC_MUTE If set the analog inputs to the ADC are muted. 5:3 AGC_FRAME_TIME This sets the frame time to be used by the AGC algorithm. In a given frame, the AGC's peak detector determines the peak value of the incoming microphone audio signal and compares this value to the target value of the AGC defined by AGC_TARGET (bits [3:1] of register (0x08h)) in order to adjust the microphone preamplifiers gain accordingly. AGC_FRAME_TIME basically sets the sample rate of the AGC to adjust for a wide variety of speech patterns. (Note 15) AGC_FRAME_TIME Time (ms) 0002 96 0012 128 0102 192 0112 256 1002 384 1012 512 1102 768 1112 1000 6 ADC_I2S_M If set the DAC clock system is enabled to drive the I2S in master mode. The Point B frequency should be double that at Point C. This bit should be set when using the I2S interface in master mode to read SAR information whenever both the audio ADC and DAC are inactive. 7 AUDIO_IF_2_16BIT If set the PCM and I2S interfaces are 16 bits per word in master mode. The 2 last clock cycles per word are 25% shorter to allow generation. 4.2.12 AGC_1 CONFIGURATION REGISTER This register is used to control the LM4935's Automatic Gain Control. (Note 16) Table 4-13. AGC_1 (0x08h) Bits Field Description 0 AGC_ENABLE If set the AGC controls the analog microphone preamplifier gain into the system. The microphone input must be passed to the ADC. 3:1 AGC_TARGET Programs the target level of the AGC. This will depend on the expected transients and desired headroom. Refer to AGC_TIGHT (bit 7 of 0x09h) for more detail. AGC_TARGET Target Level 0002 −6 dB 0012 −8 dB 0102 −10 dB 0112 −12 dB 1002 −14 dB 1012 −16 dB 1102 −18 dB 1112 −20 dB Copyright © 2005–2006, Texas Instruments Incorporated Application Information 27 Submit Documentation Feedback Product Folder Links: LM4935 LM4935RLEVAL |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
