Overview
The AD1981BJST, produced by Analog Devices Inc., is an AC '97 SoundMAX Codec designed for high-quality audio applications. This integrated circuit is part of the SoundMAX series and is known for its compatibility with the AC '97 standard, which is widely used in computer audio systems. The AD1981BJST offers a range of features that enhance audio performance, including integrated stereo headphone amplifiers, variable sample rate audio, and external audio power-down control. It is packaged in a 48-lead LQFP (7x7 mm) configuration, making it suitable for various electronic devices requiring advanced audio capabilities.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Package | 48-Lead LQFP (7x7 mm) |
| RoHS Compliance | Yes |
| Operating Temperature | 0°C to 70°C |
| Analog Supply Voltage | 4.5V to 5.5V |
| Digital Supply Voltage | 3V to 3.47V |
| Resolution (Bits) | 16, 20 bits |
| Number of ADCs / DACs | 4 / 2 |
| Dynamic Range (dB) | 85 / 90 dB |
| Signal-to-Noise Ratio (SNR) | - |
| Sample Rates | 48 kHz, 44.1 kHz |
Key Features
- S/PDIF output with 20-bit data format supporting 48 kHz and 44.1 kHz sample rates
- Integrated stereo headphone amplifier
- Variable sample rate audio
- External audio power-down control
- Stereo full-duplex codec
- 20-bit PCM DAC
- Three analog line-level stereo inputs for line-in, AUX, and CD
- Mono line-level phone input
- Dual MIC input with built-in programmable preamplifier
- High-quality CD input with ground sense
- Mono output for speakerphone or internal speaker
- Power management support
- Jack sense pins for automatic output switching
- Software-programmed VREFOUT output for biasing microphone and external power amplifier
- Built-in digital equalizer function for optimized speaker sound
Applications
The AD1981BJST is widely used in various audio-intensive applications, including:
- Computer sound cards and motherboards
- Audio interfaces and mixers
- Consumer electronics such as DVD players and home theaters
- Automotive audio systems
- Professional audio equipment
Q & A
- What is the AD1981BJST?
The AD1981BJST is an AC '97 SoundMAX Codec produced by Analog Devices Inc., designed for high-quality audio applications. - What package type does the AD1981BJST use?
The AD1981BJST is packaged in a 48-lead LQFP (7x7 mm) configuration. - Is the AD1981BJST RoHS compliant?
Yes, the AD1981BJST is RoHS compliant. - What are the operating temperature ranges for the AD1981BJST?
The operating temperature range is from 0°C to 70°C. - What are the supply voltage ranges for the AD1981BJST?
The analog supply voltage range is 4.5V to 5.5V, and the digital supply voltage range is 3V to 3.47V. - What sample rates does the AD1981BJST support?
The AD1981BJST supports sample rates of 48 kHz and 44.1 kHz. - Does the AD1981BJST have integrated amplifiers?
Yes, it includes an integrated stereo headphone amplifier. - What types of audio inputs does the AD1981BJST support?
The AD1981BJST supports three analog line-level stereo inputs for line-in, AUX, and CD, as well as a mono line-level phone input and dual MIC inputs. - Does the AD1981BJST have power management features?
Yes, it includes power management support and external audio power-down control. - What is the dynamic range of the AD1981BJST?
The dynamic range is 85 dB for ADCs and 90 dB for DACs.
