Overview
The AD1994ACPZ, produced by Analog Devices Inc., is a 2-channel, bridge tied load (BTL), switching audio power amplifier integrated with a Σ-Δ modulator. This component is designed to convert single-ended, analog input signals into switching waveforms to drive speakers directly. It features a unique modulator design that ensures stability even at high modulation factors, making it suitable for a variety of audio applications.
Key Specifications
| Parameter | Typical Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Input Impedance | 20 kΩ | AINL, AINR input pins | |
| Output DC Offset | ±4 mV | Independent of PGA setting | |
| Analog Supply, AVDD | 4.5 - 5.5 V | V | |
| Digital Supply, DVDD | 4.5 - 5.5 V | V | |
| Power Transistor Supply, PVDD | 6.5 - 22.5 V | V | |
| Dynamic Range (DNR) | 105 dB | 1 kHz, A-weighted, −60 dB referred to 1% THD + N output | |
| Crosstalk (Left-to-Right or Right-to-Left) | −100 dB | PGA = 0 dB, PO = 5 W, 1 kHz |
Key Features
- Integrated Σ-Δ modulator with seventh-order and dynamic-order reduction to second-order for stability at high modulation factors.
- On-off-mute pop noise suppression and EMI optimized modulator.
- Short-circuit protection and overtemperature protection.
- Digital, microprocessor-compatible interface for control of reset, mute, and PGA gain, as well as feedback signals for thermal and overcurrent error conditions.
- Operates over a power supply voltage range of 8 V to 20 V for the output stage and 5 V for the analog modulator and digital logic.
- High SNR and noise shaping effect due to the modulator design.
Applications
- Advanced televisions.
- Compact multimedia systems.
- Minicomponents and other audio systems requiring high-quality, efficient amplification.
Q & A
- What is the AD1994ACPZ?
The AD1994ACPZ is a 2-channel, bridge tied load (BTL), switching audio power amplifier with an integrated Σ-Δ modulator.
- What is the input impedance of the AD1994ACPZ?
The input impedance is typically 20 kΩ at the AINL and AINR input pins.
- What is the output DC offset of the AD1994ACPZ?
The output DC offset is ±4 mV, independent of the PGA setting.
- What are the power supply voltage ranges for the AD1994ACPZ?
The analog supply (AVDD) and digital supply (DVDD) range from 4.5 V to 5.5 V, while the power transistor supply (PVDD) ranges from 6.5 V to 22.5 V.
- What is the dynamic range of the AD1994ACPZ?
The dynamic range is 105 dB at 1 kHz, A-weighted, −60 dB referred to 1% THD + N output.
- Does the AD1994ACPZ have protection features?
Yes, it includes short-circuit protection and overtemperature protection.
- How does the AD1994ACPZ manage high modulation factors?
The AD1994ACPZ dynamically reverts from a seventh-order to a second-order modulator above a fixed modulation threshold to ensure stability.
- What are some common applications of the AD1994ACPZ?
It is commonly used in advanced televisions, compact multimedia systems, and other audio systems requiring high-quality amplification.
- Does the AD1994ACPZ have a digital interface?
Yes, it has a digital, microprocessor-compatible interface for controlling various functions such as reset, mute, and PGA gain.
- How does the AD1994ACPZ reduce noise?
The modulator design includes noise shaping and pop noise suppression to reduce audible artifacts.
