Overview
The AD1865N-J, produced by Analog Devices Inc., is a complete, dual 18-bit digital-to-analog converter (DAC) designed for high-performance audio applications. This monolithic chip integrates CMOS logic elements, bipolar and MOS linear elements, and laser-trimmed thin-film resistor elements, all fabricated on Analog Devices' ABCMOS process. The AD1865N-J offers excellent Total Harmonic Distortion plus Noise (THD+N) and Signal-to-Noise Ratio (SNR) without requiring any external components. It features two complete signal channels, providing cophased voltage or current output signals and eliminating the need for output demultiplexing circuitry.
Key Specifications
| Parameter | Typical | Units |
|---|---|---|
| Resolution | 18 bits | |
| THD+N | 0.004% | |
| SNR | 107 dB (20 Hz to 30 kHz) | |
| Channel Separation | 110 dB (0 dB, 990.5 Hz) | |
| Output Range (Voltage) | ±3 V | |
| Output Impedance (Voltage) | 0.1 Ω | |
| Load Current (Voltage) | ±8 mA | |
| Output Range (Current) | ±1 mA | |
| Output Impedance (Current) | 1.7 kΩ | |
| Power Supplies | ±5 V | |
| Power Dissipation | 225 mW (typical), 260 mW (maximum) | |
| Operating Temperature | -25°C to +70°C |
Key Features
- No external components required for operation.
- Partially segmented architecture with laser-trimmed resistors to minimize errors and reduce THD+N.
- High-performance output amplifiers with fast settling and high slew rate, producing ±3 V signals at load currents up to 8 mA.
- Short-circuit protected output amplifiers that can withstand indefinite short circuits to ground.
- High channel separation and matched gain and linearity across both channels.
- Versatile digital interface with five signals: Data Left, Data Right, Latch Left, Latch Right, and Clock.
- Separate analog and digital ground pins and power supplies to reduce digital feedthrough.
Applications
- Multichannel audio applications.
- Compact Disc players.
- Multivoice keyboard instruments.
- DAT players and recorders.
- Digital mixing consoles.
- Multimedia workstations.
Q & A
- What is the resolution of the AD1865N-J DAC?
The AD1865N-J has a resolution of 18 bits.
- What is the typical THD+N of the AD1865N-J?
The typical THD+N is 0.004%.
- What is the SNR of the AD1865N-J?
The SNR is typically 107 dB (20 Hz to 30 kHz).
- Does the AD1865N-J require external components for operation?
No, the AD1865N-J does not require any external components for operation.
- What is the output range of the AD1865N-J in voltage mode?
The output range is ±3 V.
- What is the load current capability of the AD1865N-J in voltage mode?
The load current capability is up to ±8 mA.
- How is the digital interface of the AD1865N-J configured?
The digital interface employs five signals: Data Left, Data Right, Latch Left, Latch Right, and Clock.
- What are the power supply requirements for the AD1865N-J?
The AD1865N-J operates with ±5 V power supplies.
- What is the typical power dissipation of the AD1865N-J?
The typical power dissipation is 225 mW, with a maximum of 260 mW.
- What is the operating temperature range of the AD1865N-J?
The operating temperature range is -25°C to +70°C.
