Overview
The AD7840KPZ is a fast, complete 14-bit voltage output Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This component integrates a 14-bit DAC, a 3V buried Zener reference, a DAC output amplifier, and high-speed control logic. It is designed to provide high accuracy and versatility in various digital-to-analog conversion applications.
The AD7840KPZ is fabricated using linear compatible CMOS (LC2MOS), an advanced mixed technology process that combines precision bipolar circuits with low power CMOS logic. This ensures high performance and reliability.
Key Specifications
| Parameter | Value | Units | Comments |
|---|---|---|---|
| Number of Bits | 14 | - | - |
| Output Type | Voltage - Buffered | - | - |
| Data Interface | Parallel, Serial | - | - |
| Reference Type | External, Internal | - | - |
| Voltage - Supply, Analog | ±5V | V | - |
| INL/DNL (LSB) | ±1 (Max), ±0.9 (Max) | LSB | - |
| Settling Time | 4µs | s | - |
| Operating Temperature | 0°C ~ 70°C | °C | - |
| Package | 28-LCC (J-Lead) | - | - |
| Dynamic Performance - Signal to Noise Ratio (SNR) | 76 dB min | dB | VOUT = 1 kHz Sine Wave, fSAMPLE = 100 kHz |
| Dynamic Performance - Total Harmonic Distortion (THD) | -78 dB max | dB | VOUT = 1 kHz Sine Wave, fSAMPLE = 100 kHz |
Key Features
- Complete 14-Bit D/A Function: The AD7840KPZ provides a complete function for creating AC signals and DC voltages to 14-bit accuracy, including an on-chip reference, an output buffer amplifier, and a 14-bit DAC.
- Dynamic Specifications: Fully specified for dynamic performance parameters such as signal-to-noise ratio and harmonic distortion, in addition to traditional DC specifications.
- Fast and Versatile Microprocessor Interface: Capable of 14-bit parallel and serial interfacing. In parallel mode, it has data setup times of 21 ns and write pulse widths of 45 ns, making it compatible with modern 16-bit microprocessors and digital signal processors. In serial mode, it features a high data transfer rate of up to 6 MHz.
- Bipolar Output Range: Provides an analog output with a bipolar range of ±3V.
- Advanced Fabrication Process: Fabricated in linear compatible CMOS (LC2MOS), combining precision bipolar circuits with low power CMOS logic.
Applications
- Digital Signal Processing (DSP): Ideal for applications requiring high dynamic performance parameters such as signal-to-noise ratio and harmonic distortion.
- Industrial Control Systems: Suitable for systems that require precise analog output signals for control and monitoring.
- Medical Devices: Can be used in medical equipment where high accuracy and reliability are crucial.
- Aerospace and Military: Available in military-grade packages, making it suitable for aerospace and military applications.
- Test and Measurement Equipment: Used in various test and measurement instruments that require precise analog outputs.
Q & A
- What is the resolution of the AD7840KPZ DAC?
The AD7840KPZ has a resolution of 14 bits.
- What are the available data interfaces for the AD7840KPZ?
The AD7840KPZ supports both parallel and serial data interfaces.
- What is the output voltage range of the AD7840KPZ?
The output voltage range is ±3V.
- What is the settling time of the AD7840KPZ?
The settling time is 4µs.
- What is the operating temperature range of the AD7840KPZ?
The operating temperature range is 0°C to 70°C.
- What type of package is the AD7840KPZ available in?
The AD7840KPZ is available in a 28-LCC (J-Lead) package.
- What is the signal-to-noise ratio (SNR) of the AD7840KPZ?
The SNR is 76 dB min for a 1 kHz sine wave at a sample rate of 100 kHz.
- Can the AD7840KPZ be used with high-speed microprocessors?
Yes, it is compatible with modern 16-bit microprocessors and digital signal processors due to its fast data setup time of 21 ns.
- What is the maximum serial data clock rate for the AD7840KPZ?
The maximum serial data clock rate is 6 MHz.
- Is the AD7840KPZ suitable for military and aerospace applications?
Yes, it is available in military-grade packages and is suitable for such applications.
