ZHCSPD5A April 2022 – September 2022 PCM5120-Q1
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- Thermal Information
- 7.4 Electrical Characteristics
- 7.5 Timing Requirements:?I2C Interface
- 7.6 Switching Characteristics: I2C Interface
- 7.7 Timing Requirements:?TDM, I2S or LJ Interface
- 7.8 Switching Characteristics: TDM, I2S or LJ Interface
- Timing Requirements:?PDM Digital Microphone Interface
- 7.9 Switching Characteristics: PDM Digial Microphone Interface
- 7.10 Timing Diagrams
- 7.11 Typical Characteristics
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Serial Interfaces
- 8.3.2 Phase-Locked Loop (PLL) and Clock Generation
- 8.3.3 Input Channel Configurations
- 8.3.4 Reference Voltage
- 8.3.5 Programmable Microphone Bias
- 8.3.6
Signal-Chain Processing
- 8.3.6.1 Programmable Channel Gain and Digital Volume Control
- 8.3.6.2 Programmable Channel Gain Calibration
- 8.3.6.3 Programmable Channel Phase Calibration
- 8.3.6.4 Programmable Digital High-Pass Filter
- 8.3.6.5 Programmable Digital Biquad Filters
- 8.3.6.6 Programmable Channel Summer and Digital Mixer
- 8.3.6.7
Configurable Digital Decimation Filters
- 8.3.6.7.1
Linear Phase Filters
- 8.3.6.7.1.1 Sampling Rate: 7.35 kHz to 8 kHz
- 8.3.6.7.1.2 Sampling Rate: 14.7 kHz to 16 kHz
- 8.3.6.7.1.3 Sampling Rate: 22.05 kHz to 24 kHz
- 8.3.6.7.1.4 Sampling Rate: 29.4 kHz to 32 kHz
- 8.3.6.7.1.5 Sampling Rate: 44.1 kHz to 48 kHz
- 8.3.6.7.1.6 Sampling Rate: 88.2 kHz to 96 kHz
- 8.3.6.7.1.7 Sampling Rate: 176.4 kHz to 192 kHz
- 8.3.6.7.1.8 Sampling Rate: 352.8 kHz to 384 kHz
- 8.3.6.7.1.9 Sampling Rate: 705.6 kHz to 768 kHz
- 8.3.6.7.2 Low-Latency Filters
- 8.3.6.7.3
Ultra-Low Latency Filters
- 8.3.6.7.3.1 Sampling Rate: 14.7 kHz to 16 kHz
- 8.3.6.7.3.2 Sampling Rate: 22.05 kHz to 24 kHz
- 8.3.6.7.3.3 Sampling Rate: 29.4 kHz to 32 kHz
- 8.3.6.7.3.4 Sampling Rate: 44.1 kHz to 48 kHz
- 8.3.6.7.3.5 Sampling Rate: 88.2 kHz to 96 kHz
- 8.3.6.7.3.6 Sampling Rate: 176.4 kHz to 192 kHz
- 8.3.6.7.3.7 Sampling Rate: 352.8 kHz to 384 kHz
- 8.3.6.7.1
Linear Phase Filters
- 8.3.7 Dynamic Range Enhancer (DRE)
- 8.3.8 Dynamic Range Compressor (DRC)
- 8.3.9 Automatic Gain Controller (AGC)
- 8.3.10 Voice Activity Detection (VAD)
- 8.3.11 Digital PDM Microphone Record Channel
- 8.3.12 Interrupts, Status, and Digital I/O Pin Multiplexing
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6 Register Maps
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.6.5 Programmable Digital Biquad Filters
The device supports up to 12 programmable digital biquad filters. These highly efficient filters achieve the desired frequency response. In digital signal processing, a digital biquad filter is a second-order, recursive linear filter with two poles and two zeros. Equation 2 gives the transfer function of each biquad filter:
The frequency response for the biquad filter section with default coefficients is flat at a gain of 0 dB (all-pass filter). The host device can override the frequency response by programming the biquad coefficients to achieve the desired frequency response for a low-pass, high-pass, or any other desired frequency shaping. The programmable coefficients for the mixer operation are located in Section 8.6.4.1 and Section 8.6.4.2. If biquad filtering is required, then the host device must write these coefficients values before powering up any ADC channels for recording. As described in Table 8-19, these biquad filters can be allocated for each output channel based on the BIQUAD_CFG[1:0] register setting of P0_R108. By setting BIQUAD_CFG[1:0] to 2'b00, the biquad filtering for all record channels is disabled and the host device can choose this setting if no additional filtering is required for the system application. See the TLV320ADCx140 Programmable Biquad Filter Configuration and Applications application report for further details.
| PROGRAMMABLE BIQUAD FILTER | RECORD OUTPUT CHANNEL ALLOCATION USING P0_R108_D[6:5] REGISTER SETTING | ||
|---|---|---|---|
| BIQUAD_CFG[1:0] = 2'b01 (1 Biquad per Channel) |
BIQUAD_CFG[1:0] = 2'b10 (Default) (2 Biquads per Channel) |
BIQUAD_CFG[1:0] = 2'b11 (3 Biquads per Channel) |
|
| Biquad filter 1 | Allocated to output channel 1 | Allocated to output channel 1 | Allocated to output channel 1 |
| Biquad filter 2 | Allocated to output channel 2 | Allocated to output channel 2 | Allocated to output channel 2 |
| Biquad filter 3 | Allocated to output channel 3 | Allocated to output channel 3 | Allocated to output channel 3 |
| Biquad filter 4 | Allocated to output channel 4 | Allocated to output channel 4 | Allocated to output channel 4 |
| Biquad filter 5 | Not used | Allocated to output channel 1 | Allocated to output channel 1 |
| Biquad filter 6 | Not used | Allocated to output channel 2 | Allocated to output channel 2 |
| Biquad filter 7 | Not used | Allocated to output channel 3 | Allocated to output channel 3 |
| Biquad filter 8 | Not used | Allocated to output channel 4 | Allocated to output channel 4 |
| Biquad filter 9 | Not used | Not used | Allocated to output channel 1 |
| Biquad filter 10 | Not used | Not used | Allocated to output channel 2 |
| Biquad filter 11 | Not used | Not used | Allocated to output channel 3 |
| Biquad filter 12 | Not used | Not used | Allocated to output channel 4 |
Table 8-20 shows the biquad filter coefficients mapping to the register space.
| PROGRAMMABLE BIQUAD FILTER | BIQUAD FILTER COEFFICIENTS REGISTER MAPPING | PROGRAMMABLE BIQUAD FILTER | BIQUAD FILTER COEFFICIENTS REGISTER MAPPING |
|---|---|---|---|
| Biquad filter 1 | P2_R8-R27 | Biquad filter 7 | P3_R8-R27 |
| Biquad filter 2 | P2_R28-R47 | Biquad filter 8 | P3_R28-R47 |
| Biquad filter 3 | P2_R48-R67 | Biquad filter 9 | P3_R48-R67 |
| Biquad filter 4 | P2_R68-R87 | Biquad filter 10 | P3_R68-R87 |
| Biquad filter 5 | P2_R88-R107 | Biquad filter 11 | P3_R88-R107 |
| Biquad filter 6 | P2_R108-R127 | Biquad filter 12 | P3_R108-R127 |