Overview
The AD835AR-REEL, produced by Analog Devices Inc., is a four-quadrant, voltage output analog multiplier. It is fabricated on an advanced dielectrically isolated complementary bipolar process, offering high speed and versatility. The AD835 provides the linear product of its X and Y voltage inputs, with a unique summing feature at the Z input that allows for additional signal processing capabilities. This component is designed for simplicity, requiring minimal external components, and is particularly suited for applications that demand fast multiplication, division, and other signal processing functions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Bandwidth | - | 250 | - | MHz |
| Small Signal Rise Time | - | 1 | - | ns |
| Full-Scale Rise/Fall Times | - | 2.5 | - | ns (RL = 150 Ω) |
| Settling Time to 0.1% FS | - | 20 | - | ns (RL = 150 Ω) |
| Differential Input Resistance | - | 100 kΩ || 2 pF | - | - |
| Output Voltage Swing | ±2.0 | ±2.2 | ±2.5 | V (RL = 150 Ω) |
| Voltage Noise Spectral Density | - | 50 | - | nV/√Hz (f < 10 MHz) |
| Common Mode Rejection Ratio (CMRR) | - | 70 | - | dB (f ≤ 1 MHz) |
| Supply Voltage | ±5 | - | - | V |
Key Features
- Simple and Complete Functionality: Provides the basic function of W = XY + Z with minimal external components required.
- High Speed: Settles to 0.1% of full scale in 20 ns and has a small signal rise time of 1 ns.
- DC-Coupled Voltage Output: Simplifies use in various applications.
- High Differential Input Impedance: X, Y, and Z inputs have high impedance, reducing signal source loading.
- Low Multiplier Noise: 50 nV/√Hz at frequencies below 10 MHz.
- Summing Input (Z): Allows for voltage gain and independent ground references for input and output.
- Low Impedance Output: Capable of driving loads as small as 25 Ω.
Applications
- Very Fast Multiplication, Division, and Squaring: Ideal for high-speed signal processing.
- Wideband Modulation and Demodulation: Suitable for wideband communication systems.
- Phase Detection and Measurement: Used in phase-locked loops and phase detectors.
- Sinusoidal Frequency Doubling: Useful in frequency multiplication applications.
- Video Gain Control and Keying: Applied in video signal processing.
- Voltage-Controlled Amplifiers and Filters: Utilized in agile and tunable RF systems.
Q & A
- What is the output bandwidth of the AD835?
The AD835 has an output bandwidth of 250 MHz.
- How quickly does the AD835 settle to 0.1% of full scale?
The AD835 settles to 0.1% of full scale in 20 ns.
- What is the typical rise time of the AD835 for small signals?
The small signal rise time is 1 ns.
- What is the differential input impedance of the AD835?
The differential input impedance is 100 kΩ || 2 pF.
- What is the voltage noise spectral density of the AD835?
The voltage noise spectral density is 50 nV/√Hz at frequencies below 10 MHz.
- What is the common mode rejection ratio (CMRR) of the AD835?
The CMRR is 70 dB at frequencies up to 1 MHz.
- What is the typical output voltage swing of the AD835?
The output voltage swing is typically ±2.2 V with a load resistance of 150 Ω.
- Can the AD835 drive low impedance loads?
Yes, the AD835 can drive loads as small as 25 Ω.
- What is the purpose of the Z input in the AD835?
The Z input allows for summing and provides voltage gain, as well as independent ground references for the input and output.
- In what package is the AD835AR-REEL available?
The AD835AR-REEL is available in an 8-SOIC package.
