SBAA381B April   2019  – May 2024 TLV320ADC3140 , TLV320ADC5140 , TLV320ADC6140

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Processing Blocks of TLV320ADCx140/PCMx140-Q1
    1. 2.1 Decimation Filter Response
      1. 2.1.1 Supported Sample Rates
    2. 2.2 AGC or DRE
      1. 2.2.1 Supported Sample Rates
      2. 2.2.2 Channel Assignment
    3. 2.3 Channel Summer, Digital Mixer, and Bi-quads
  6. 3Processing Blocks Supported for Different Sample Rates
    1. 3.1 8 kHz Sample Rate
    2. 3.2 16 kHz-48 kHz Sample Rate
    3. 3.3 96 kHz Sample Rate
    4. 3.4 192 kHz Sample Rate
    5. 3.5 384 kHz Sample Rate
    6. 3.6 768 kHz Sample Rate
  7. 4Example Configurations
  8. 5References
  9. 6Revision History

2.3 Channel Summer, Digital Mixer, and Bi-quads

The device supports one four-channel mixer, one channel summation mode, and up to three bi-quads per channel. These features are supported for all sample rates from 8 kHz to 192 kHz. See Table 2-5 for configuration details of the summer and mixer modes. The programmable mixer feature is available only if CH_SUM[2:0] is set to 2'b00. The mixer function is only supported for input channel 1 to channel 4.

The number of bi-quad filters per channel can be set using the P0_R108:BQ_CFG bits, as shown in Table 2-6. For additional information on bi-quad filter configuration, refer to the TLV320ADCx140/PCMx140-Q1 Programmable Bi-quad Filter Configuration and Applications, application note.

Table 2-5 Channel Summing Mode and Digital Mixer Programmable Settings
P0_R107_D[3:2] : CH_SUM[1:0]CHANNEL SUMMING MODE FOR INPUT CHANNELS
00 (Default)Channel summing mode is disabled (Digital Mixer is enabled).
01Output channel 1 = (input channel 1 + input channel 2) / 2
Output channel 2 = (input channel 1 + input channel 2) / 2
10Reserved
11Reserved
Table 2-6 Bi-quad Configuration Settings
P0_R108_D[6:5] : BQ_CFG[1:0]BI-QUAD CONFIGURATION
00 (Default)No bi-quads per channel; bi-quads are all disabled.
011 bi-quad per channel
102 bi-quads per channel
113 bi-quads per channel

Table 2-7 lists the processing blocks that are available for a given input channel. These assignments are fixed and cannot be changed. The two-channel summer mode is available for the first two channels, and cannot be assigned to channels 3 and 4, even if some of the other channels are disabled. Whereas, the four-channel mixer and three bi-quads per channel are available for all the four channels. Input channels 1 to 2 support the most features, while channels 3 and 4 support the least number of features.

Table 2-7 Processing Block Assignments Across Input Channels
POST-PROCESSING LOCK1234
Two-channel Summer√√xx
Four-channel Mixer√√√√
Bi-quads Available3333