Overview
The PCM1840IRTWR is a high-performance, quad-channel 32-bit audio analog-to-digital converter (ADC) produced by Texas Instruments. This device supports the simultaneous sampling of up to four analog channels, making it ideal for applications requiring high-quality audio conversion. The PCM1840 integrates various features such as microphone bias voltage, a phase-locked loop (PLL), and a DC removal high-pass filter (HPF), and it supports sample rates up to 192 kHz. It is designed for cost-sensitive, space-constrained audio systems, particularly in far-field microphone recording applications.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 24-pin WQFN (RTW) |
| Operating Temperature Range | -40°C to 125°C |
| Sample Rate (fS) | 8 kHz to 192 kHz |
| Dynamic Range | 123 dB (DRE enabled), 113 dB (DRE disabled) |
| THD+N | -98 dB |
| Input Type | Differential line and microphone inputs |
| Full-Scale Input | 2 VRMS |
| Power Supply | Single supply: 3.3 V, I/O supply: 3.3 V or 1.8 V |
| Power Consumption | 17.0 mW/channel at 16 kHz, 18.4 mW/channel at 48 kHz |
| Audio Interface Formats | TDM, I2S, Left-Justified (LJ) |
| Master/Slave Mode | Selectable via hardware pins |
Key Features
- Multichannel high-performance ADC supporting up to four analog channels.
- Differential line and microphone inputs with 2 VRMS full-scale signal.
- Dynamic range of 123 dB with dynamic range enhancer enabled and 113 dB with it disabled.
- THD+N of -98 dB.
- Linear-phase or low-latency filter selection via hardware pins.
- Flexible audio serial data interface: master or slave mode, TDM, I2S, and left-justified formats.
- Integrated high-performance audio PLL and low-noise MICBIAS 2.75-V output.
- Automatic power-down upon loss of audio clocks.
- Single-supply operation at 3.3 V and I/O supply operation at 3.3 V or 1.8 V.
Applications
- Smart speakers
- DVD recorders and players
- AV receivers
- Video conference systems
- IP network cameras
- Far-field microphone recording applications
Q & A
- What is the maximum sample rate supported by the PCM1840?
The PCM1840 supports sample rates up to 192 kHz.
- What are the different audio interface formats supported by the PCM1840?
The PCM1840 supports TDM, I2S, and left-justified (LJ) audio formats.
- Can the PCM1840 operate in both master and slave modes?
- What is the dynamic range of the PCM1840 with the dynamic range enhancer enabled?
The dynamic range is 123 dB with the dynamic range enhancer enabled.
- What is the power consumption of the PCM1840 at a 48 kHz sample rate?
The power consumption is 18.4 mW per channel at a 48 kHz sample rate.
- Does the PCM1840 support single-ended inputs?
No, the PCM1840 does not support single-ended inputs; it requires differential inputs.
- What is the operating temperature range of the PCM1840?
The operating temperature range is -40°C to 125°C.
- What type of power supply does the PCM1840 require?
The PCM1840 requires a single supply of 3.3 V, with optional I/O supply of 3.3 V or 1.8 V.
- Does the PCM1840 have integrated microphone bias voltage?
- What is the THD+N specification of the PCM1840?
The THD+N specification is -98 dB.
