Overview
The AD834JR, produced by Analog Devices Inc., is a monolithic, laser-trimmed four-quadrant analog multiplier designed for high-frequency applications. It boasts a transconductance bandwidth exceeding 500 MHz from either of the differential voltage inputs, making it suitable for a wide range of high-speed nonlinear operations. The device is available in various packages, including 8-lead PDIP and plastic SOIC, and operates over the commercial temperature range of 0°C to 70°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max |
|---|---|---|---|---|
| Supply Voltage (+VS to −VS) | 18 V | |||
| Internal Power Dissipation | 500 mW | |||
| Operating Temperature Range | Commercial (AD834J) | 0°C | 70°C | |
| Operating Temperature Range | Industrial (AD834A) | −40°C | +85°C | |
| Operating Temperature Range | Military (AD834SQ/883B) | −55°C | +125°C | |
| Storage Temperature Range | −65°C | +150°C (Q), +125°C (R, N) | ||
| Lead Temperature (Soldering, 60 sec) | 300°C | |||
| ESD Rating | 500 V | |||
| Transfer Function | W = XY (1V)^2 × 4 mA | |||
| Total Error | −1 V ≤ X, Y < +1 V | ±0.5% | ||
| Bandwidth | 500 MHz | |||
| Zero Signal Current Each Output | 8.5 mA | |||
| Differential Offset | X = 0, Y = 0 | ±20 µA | ||
| Output Compliance | 4.75 V to 9 V | |||
| Noise Spectral Density | f = 10 Hz to 1 MHz | 16 nV/√Hz | ||
| Quiescent Current | TMIN to TMAX +VS | 11 mA | 14 mA | |
| Quiescent Current | TMIN to TMAX −VS | 28 mA | 35 mA |
Key Features
- High Static Accuracy and Bandwidth: Combines low input and output offsets with a high bandwidth of over 500 MHz, making it suitable for high-frequency applications.
- Low Distortion and Feedthrough: Exhibits low distortion levels (better than −60 dB on either input) and low signal feedthrough (typically −65 dB up to 20 MHz).
- Low Differential Phase Error: Shows low differential phase error over the input range, typically 0.08° at 5 MHz and 0.8° at 50 MHz.
- Fast Transient Response: Features a large signal transient response free from overshoot, with an intrinsic rise time of 500 ps and settling to within 1% in under 5 ns.
- High Impedance Differential Inputs: Nonloading, high impedance differential inputs simplify the application of the AD834.
- Temperature and Supply Stability: Performance is relatively insensitive to temperature and supply variations due to stable biasing based on a bandgap reference generator.
Applications
- High-Speed Nonlinear Operations: Used in square rooting, analog division, vector addition, and rms-to-dc conversion.
- Power Measurement: Suitable for power measurement applications where subsequent signal processing may not require high bandwidth.
- Linear Keyers for High Resolution Television: Can be used in wideband true RMS applications and other high-frequency signal processing tasks.
- Other High-Frequency Applications: Applicable in various high-frequency analog signal processing scenarios due to its high bandwidth and low distortion characteristics).
Q & A
- What is the AD834JR primarily used for?
The AD834JR is primarily used as a four-quadrant analog multiplier in high-frequency applications, including high-speed nonlinear operations such as square rooting, analog division, and rms-to-dc conversion).
- What is the bandwidth of the AD834JR?
The AD834JR has a transconductance bandwidth exceeding 500 MHz from either of the differential voltage inputs).
- What are the operating temperature ranges for the AD834JR?
The AD834JR operates over the commercial temperature range of 0°C to 70°C. Other models (AD834A and AD834SQ/883B) operate over industrial and military temperature ranges, respectively).
- How does the AD834JR handle distortion and feedthrough?
The AD834JR exhibits low distortion levels (better than −60 dB on either input) and low signal feedthrough (typically −65 dB up to 20 MHz)).
- What is the typical total full-scale error of the AD834JR?
The typical total full-scale error of the AD834JR is 0.5%, dependent on the application mode and the external circuitry).
- How do the outputs of the AD834JR need to be processed?
The outputs of the AD834JR appear as a differential pair of currents at open collectors. To provide a single-ended ground-referenced voltage output, external current-to-voltage conversion is needed, such as using a wideband transformer, balun, or active circuitry like an op amp).
- What are the key features of the AD834JR's input stage?
The AD834JR has nonloading, high impedance differential inputs that simplify its application).
- How does the AD834JR perform in terms of transient response?
The AD834JR has a large signal transient response that is free from overshoot, with an intrinsic rise time of 500 ps and settling to within 1% in under 5 ns).
- What are some common applications of the AD834JR?
The AD834JR is used in various high-frequency analog signal processing tasks, including power measurement, linear keyers for high resolution television, and other high-speed nonlinear operations).
- How stable is the AD834JR to temperature and supply variations?
The performance of the AD834JR is relatively insensitive to temperature and supply variations due to stable biasing based on a bandgap reference generator).
