Overview
The AD835AR, produced by Analog Devices Inc., is a complete four-quadrant, voltage output analog multiplier. It is fabricated on an advanced dielectrically isolated complementary bipolar process, offering high speed and versatility. The AD835AR generates the linear product of its X and Y voltage inputs, making it suitable for a wide range of signal processing applications. It features a −3 dB output bandwidth of 250 MHz and a small signal rise time of 1 ns, ensuring very fast operation. The device is designed to be simple to use, requiring minimal external components, and is available in 8-lead PDIP and SOIC packages.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Bandwidth | -3 dB | 250 | MHz | ||
| Small Signal Rise Time | 1 | ns | |||
| Full-Scale Rise/Fall Times | RL = 150 Ω | 2.5 | ns | ||
| Settling Time to 0.1% FS | RL = 150 Ω | 20 | ns | ||
| Differential Input Resistance | 100 kΩ || 2 pF | ||||
| Output Voltage Swing | RL = 150 Ω | ±2.0 | ±2.5 | V | |
| Voltage Noise Spectral Density | X = Y = 0 V, f < 10 MHz | 50 | nV/√Hz | ||
| Supply Voltage | ±4.5 | ±5 | ±5.5 | V | |
| Operating Temperature Range | -40 | +85 | °C |
Key Features
- Simple and Complete Functionality: The basic function is W = XY + Z, requiring minimal external components.
- High Speed Operation: Settles to 0.1% of full scale in 20 ns and has a small signal rise time of 1 ns.
- High Differential Input Impedance: X, Y, and Z inputs have high impedance, reducing signal source loading.
- DC-Coupled Voltage Output: Simplifies use in various applications.
- Low Multiplier Noise: 50 nV/√Hz, making it suitable for low-level signal processing.
- High Output Current Capability: Can drive loads as low as 25 Ω.
- Voltage Gain Capability: The Z input allows for voltage gains up to about ×10.
Applications
- Very Fast Multiplication, Division, Squaring: Ideal for high-speed mathematical operations.
- Wideband Modulation and Demodulation: Suitable for wideband signal processing.
- Phase Detection and Measurement: Used in phase detection and measurement applications.
- Sinusoidal Frequency Doubling: Can be used for frequency doubling in sinusoidal signals.
- Video Gain Control and Keying: Applicable in video signal processing.
- Voltage-Controlled Amplifiers and Filters: Useful in voltage-controlled circuits.
Q & A
- What is the primary function of the AD835AR?
The primary function of the AD835AR is to generate the linear product of its X and Y voltage inputs, expressed as W = XY + Z.
- What is the output bandwidth of the AD835AR?
The output bandwidth of the AD835AR is 250 MHz with a −3 dB small signal rise time of 1 ns.
- How quickly does the AD835AR settle to 0.1% of full scale?
The AD835AR settles to 0.1% of full scale in typically 20 ns.
- What is the input impedance of the X, Y, and Z inputs?
The input impedance of the X, Y, and Z inputs is high, specifically 100 kΩ || 2 pF.
- What is the voltage noise spectral density of the AD835AR?
The voltage noise spectral density of the AD835AR is 50 nV/√Hz.
- What is the typical supply voltage range for the AD835AR?
The typical supply voltage range for the AD835AR is ±5 V, with an operating range of ±4.5 V to ±5.5 V.
- What is the operating temperature range of the AD835AR?
The operating temperature range of the AD835AR is −40°C to +85°C.
- What types of packages are available for the AD835AR?
The AD835AR is available in 8-lead PDIP and SOIC packages.
- What are some common applications of the AD835AR?
Common applications include very fast multiplication, division, squaring, wideband modulation and demodulation, phase detection and measurement, sinusoidal frequency doubling, video gain control and keying, and voltage-controlled amplifiers and filters.
- How does the Z input enhance the functionality of the AD835AR?
The Z input allows for the addition of a signal at the output and provides the means to operate the AD835AR with voltage gains up to about ×10.
