Overview
The AD790JRZ is a fast and precise voltage comparator produced by Analog Devices Inc. This device is known for its exceptional versatility and ease of use, making it a valuable component in various analog signal processing and data acquisition systems. The AD790JRZ operates from either a single +5 V supply or a dual ±15 V supply, allowing it to handle a wide range of input voltages. Fabricated using Analog Devices' Complementary Bipolar (CB) process, it offers a combination of fast response time (45 ns propagation delay) and outstanding input voltage resolution (1 mV max).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Propagation Delay (100 mV Step, 5 mV Overdrive) | 40 | 45 | 45 | ns |
| Input Offset Voltage | 0.2 | 1.0 | 1.5 | mV |
| Input Hysteresis | 0.3 | 0.4 | 0.6 | mV |
| Bias Current (Either Input) | 2.5 | 5 | 5 | nA |
| Output HIGH Voltage (1.6 mA Source) | 4.3 | 4.45 | 4.65 | V |
| Output LOW Voltage (1.6 mA Sink) | 0.35 | 0.44 | 0.5 | V |
| Supply Voltage (Single Supply) | 4.5 | - | 7 | V |
| Supply Voltage (Dual Supply) | -15 | - | +15 | V |
| Power Dissipation | - | - | 60 | mW |
| Temperature Range | -55 | - | +125 | °C |
Key Features
- Fast Response Time: The AD790JRZ has a propagation delay of 45 ns, making it suitable for high-speed applications.
- Precision Input Voltage Resolution: It offers an input voltage resolution of 1 mV max, ensuring high accuracy in signal comparison.
- Low Glitch Output Stage: The device incorporates a low-glitch output stage that minimizes power supply disturbances and unwanted oscillations.
- Wide Supply Voltage Range: It can operate from a single +5 V supply or a dual ±15 V supply, providing flexibility in system design.
- Latching Function: The AD790JRZ includes a latching function, making it suitable for applications requiring synchronous operation.
- Built-in Hysteresis: The device features built-in hysteresis, which helps in minimizing the chance of unwanted oscillations.
- CMOS or TTL Compatible Output: The output is compatible with both CMOS and TTL logic, enhancing its usability in various systems.
Applications
- Zero-Crossing Detectors: The AD790JRZ is suitable for detecting zero-crossing points in signals, which is crucial in power management and signal processing applications.
- Overvoltage Detectors: It can be used to detect overvoltage conditions, protecting electronic systems from voltage surges.
- Pulse-Width Modulators: The device is applicable in pulse-width modulation circuits due to its fast response time and precision.
- Precision Rectifiers: The AD790JRZ can be used in precision full-wave rectifier circuits, capable of rectifying low-level signals as well as high-amplitude signals.
- Discrete A/D Converters and Delta-Sigma Modulator A/Ds: It is suitable for use in analog-to-digital conversion systems due to its high precision and speed.
Q & A
- What is the propagation delay of the AD790JRZ?
The propagation delay of the AD790JRZ is 45 ns.
- What is the input voltage resolution of the AD790JRZ?
The input voltage resolution of the AD790JRZ is 1 mV max.
- Can the AD790JRZ operate from a single supply voltage?
Yes, the AD790JRZ can operate from a single +5 V supply or a dual ±15 V supply.
- What is the significance of the low-glitch output stage in the AD790JRZ?
The low-glitch output stage minimizes power supply disturbances and unwanted oscillations, ensuring stable operation.
- Does the AD790JRZ have a latching function?
Yes, the AD790JRZ includes a latching function, making it suitable for applications requiring synchronous operation.
- What are the temperature ranges for the different grades of the AD790JRZ?
The AD790J and AD790K are rated over the commercial temperature range of 0°C to 70°C, the AD790A and AD790B are rated over the industrial temperature range of -40°C to +85°C, and the AD790S is rated over the military temperature range of -55°C to +125°C.
- What types of packages are available for the AD790JRZ?
The AD790JRZ is available in 8-pin plastic mini-DIP, CerDIP, and SOIC packages.
- Is the AD790JRZ compatible with CMOS and TTL logic?
Yes, the output of the AD790JRZ is compatible with both CMOS and TTL logic.
- What are some common applications of the AD790JRZ?
The AD790JRZ is commonly used in zero-crossing detectors, overvoltage detectors, pulse-width modulators, precision rectifiers, and discrete A/D converters.
- How does the built-in hysteresis benefit the AD790JRZ?
The built-in hysteresis helps in minimizing the chance of unwanted oscillations, making the AD790JRZ easier to use than standard open-loop comparators.
