Overview
The PCM1803A, produced by Texas Instruments, is a high-performance, low-cost, single-chip stereo analog-to-digital converter (ADC). It features single-ended analog voltage inputs and is designed for cost-sensitive consumer applications. The device utilizes a delta-sigma modulator with 64- and 128-times oversampling, along with a digital decimation filter and a high-pass filter to remove the DC component of the input signal. It operates from dual power supplies: 5 V for the analog section and 3.3 V for the digital section, and is available in a compact 20-pin SSOP package.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 24-Bit |
| Converter Type | Delta-Sigma Stereo A/D Converter |
| Analog Input | Single-Ended Voltage Input: 3 Vp-p |
| Oversampling Frequency | ×64, ×128 |
| Pass-Band Ripple | ±0.05 dB |
| Stop-Band Attenuation | 65 dB |
| High-Pass Filter | 0.84 Hz (44.1 kHz) |
| THD+N | 95 dB (Typically) |
| SNR | 103 dB (Typically) |
| Dynamic Range | 103 dB (Typically) |
| Sampling Rate | 16 kHz to 96 kHz |
| System Clock | 256 fS, 384 fS, 512 fS, 768 fS |
| Data Formats | 24-Bit Left-Justified, 24-Bit I2S, 20-, 24-Bit Right-Justified |
| Package | 20-Pin SSOP |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- 24-Bit Delta-Sigma Stereo A/D Converter
- Single-Ended Voltage Input: 3 Vp-p
- Oversampling Decimation Filter with ±0.05 dB pass-band ripple and 65 dB stop-band attenuation
- On-Chip High-Pass Filter: 0.84 Hz (44.1 kHz)
- High-Performance: THD+N of 95 dB, SNR of 103 dB, and Dynamic Range of 103 dB (Typically)
- PCM Audio Interface with Master or Slave Mode Selectable
- Supports multiple data formats: 24-Bit Left-Justified, 24-Bit I2S, 20-, 24-Bit Right-Justified
- Sampling Rate: 16 kHz to 96 kHz
- System Clock: 256 fS, 384 fS, 512 fS, 768 fS
- Dual Power Supplies: 5 V for Analog, 3.3 V for Digital
- Internal Power-On-Reset Circuit
Applications
- Cost-sensitive consumer audio applications
- AV Amplifier Receivers
- MD Players
- Electric Musical Instruments
- Other audio systems requiring high performance and low cost
Q & A
- What is the resolution of the PCM1803A ADC?
The PCM1803A has a 24-bit resolution.
- What type of analog input does the PCM1803A support?
The PCM1803A supports single-ended voltage input with a range of 3 Vp-p.
- What are the oversampling frequencies of the PCM1803A?
The PCM1803A has oversampling frequencies of ×64 and ×128.
- What is the typical SNR of the PCM1803A?
The typical signal-to-noise ratio (SNR) of the PCM1803A is 103 dB.
- What are the supported data formats by the PCM1803A?
The PCM1803A supports 24-Bit Left-Justified, 24-Bit I2S, and 20-, 24-Bit Right-Justified data formats.
- What is the operating temperature range of the PCM1803A?
The operating temperature range of the PCM1803A is -40°C to 85°C.
- What are the power supply requirements for the PCM1803A?
The PCM1803A requires a 5 V analog power supply and a 3.3 V digital power supply.
- Does the PCM1803A support master and slave modes?
Yes, the PCM1803A supports both master and slave modes for the audio interface.
- What is the package type of the PCM1803A?
The PCM1803A is available in a 20-pin SSOP package.
- What is the typical dynamic range of the PCM1803A?
The typical dynamic range of the PCM1803A is 103 dB.
