Overview
The AD1854JRS, produced by Analog Devices Inc., is a high-performance, single-chip stereo audio Digital-to-Analog Converter (DAC). It is designed to deliver exceptional audio quality with a dynamic range of 113 dB and a Signal-to-Noise Ratio (SNR) of 112 dB (A-weighted, not muted) at a 48 kHz sample rate. This DAC is part of the AD1854 series, which includes various models with slightly different specifications but all sharing the same core features and performance characteristics.
Key Specifications
| Specification | Value | Unit |
|---|---|---|
| Resolution | 20 Bits | |
| Signal-to-Noise Ratio (20 Hz to 20 kHz) | 110 dB (No Filter, AD1854KRS) | |
| Dynamic Range (20 Hz to 20 kHz, –60 dB Input) | 113 dB (With A-Weighted Filter, AD1854KRS) | |
| Total Harmonic Distortion + Noise | –94 dB to –101 dB (VO = 0 dB, AD1854KRS) | |
| Output Range | ±2.8 V (Differential Output Range, ±Full Scale) | V |
| Output Impedance | <200 Ω | Ω |
| Sample Rate | Up to 96 kHz | kHz |
| Input Data Format | 16, 18, 20, or 24 bits, MSB-first, twos-complement | |
| Operating Temperature | 0°C to 70°C | °C |
| Power Supply | 5 V | V |
| Package Type | 28-lead SSOP |
Key Features
- High-Performance Audio: Delivers 113 dB dynamic range and 112 dB SNR (A-weighted, not muted) at 48 kHz sample rate.
- Flexible Data Input: Accepts 16-, 18-, 20-, or 24-bit data in MSB-first, twos-complement format.
- Multibit Sigma-Delta Modulator: Includes “Perfect Differential Linearity Restoration” for reduced idle tones and noise floor.
- Data Directed Scrambling DAC: Least sensitive to jitter, ensuring high-quality audio output.
- Differential Output: Provides optimum performance with a differential output range of ±2.8 V (full scale).
- On-Chip Stereo Attenuator and Mute: Programmable through an SPI-compatible serial control port.
- Power-Down Mode: Minimizes power consumption when the device is inactive.
- Compatibility: Fully compatible with current DVD formats and backwards compatible with 44.1 kHz sample frequency playback from compact discs.
Applications
- Consumer Audio Equipment: Ideal for DVD players, CD players, and other consumer audio devices.
- Professional Audio Systems: Suitable for professional audio equipment requiring high-quality audio conversion.
- Automotive Audio Systems: Can be used in high-performance automotive audio systems.
- Home Theater Systems: Enhances the audio quality in home theater setups.
Q & A
- What is the dynamic range of the AD1854JRS at 48 kHz sample rate?
The dynamic range of the AD1854JRS is 113 dB at 48 kHz sample rate.
- What are the supported input data formats for the AD1854JRS?
The AD1854JRS supports 16-, 18-, 20-, or 24-bit data in MSB-first, twos-complement format.
- What is the maximum sample rate supported by the AD1854JRS?
The AD1854JRS supports up to 96 kHz sample rate.
- What type of modulator is used in the AD1854JRS?
The AD1854JRS uses a multibit sigma-delta modulator.
- Does the AD1854JRS have a power-down mode?
Yes, the AD1854JRS has a power-down mode to minimize power consumption when the device is inactive.
- What is the operating temperature range of the AD1854JRS?
The operating temperature range of the AD1854JRS is 0°C to 70°C.
- What type of package does the AD1854JRS come in?
The AD1854JRS comes in a 28-lead SSOP package.
- Is the AD1854JRS compatible with DVD formats?
Yes, the AD1854JRS is fully compatible with current DVD formats and also supports 44.1 kHz sample frequency playback from compact discs.
- How is the on-chip stereo attenuator and mute controlled?
The on-chip stereo attenuator and mute are programmable through an SPI-compatible serial control port.
- What is the output impedance of the AD1854JRS?
The output impedance of the AD1854JRS is less than 200 Ω.
