Analog Devices Inc. AD835AR

Overview

AD835AR from Analog Devices is a monolithic 250 MHz, four-quadrant voltage-output analog multiplier in an 8-lead SOIC package. It implements W = XY + Z with ±1 V differential input range, 20 ns settling time to 0.1%, and 50 nV/√Hz output noise-enabling high-fidelity video gain control, RF amplitude modulation, and sinusoidal frequency doubling in wideband signal processing systems.

For engineers reviewing the AD835AR datasheet, AD835AR pinout, AD835AR application, or AD835AR equivalent, this page delivers verified specifications, functional pin mapping, real-world use cases for modulators and VCAs, and two validated alternative multipliers with documented technical and application-level differences.

Technical Context

The AD835AR uses a dielectrically isolated complementary bipolar process with a translinear core and three linearized voltage-to-current converters (X, Y, Z), referenced to a low-noise bandgap scaling voltage (U ≈ 1.05 V). Its differential inputs (X1/X2, Y1/Y2) provide 100 kΩ || 2 pF impedance and 70 dB CMRR at ≤100 kHz.

The output stage drives loads down to 25 Ω with ±2.5 V swing and achieves 250 MHz −3 dB bandwidth via optimized current-mode architecture. The Z input supports summing and gain adjustment (up to ×10), enabling voltage-controlled amplifier configurations without external op-amps.

Key Specifications

Pinout & Package

AD835AR is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and 1.75 mm max height. Thermal resistance is θ_JA = 115°C/W, θ_JC = 45°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplier applications.

Compared with AD835AR, AD834AN trades 250 MHz bandwidth and 50 nV/√Hz noise for superior DC linearity, while MPY634KP sacrifices speed to achieve 10× better scale factor stability-making AD835AR the sole choice for UHF modulation and zero-bounce frequency doubling where both speed and noise matter.

Availability

AD835AR is available at Aetrix Electronics and suitable for video processing, RF communications, test instrumentation, and scientific measurement systems requiring stable component supply across extended temperature ranges.

Supply support for AD835AR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision and high-speed applications.

The AD835AR belongs to Analog Devices' high-speed analog multiplier product line, engineered specifically for wideband signal processing in communications, instrumentation, and video systems where speed, noise, and four-quadrant operation are essential.

FAQ

What is the maximum load drive capability of the AD835AR output?

The AD835AR output can drive loads as low as 25 Ω while maintaining ±2.2 V minimum swing into 150 Ω and ±2.0 V into 50 Ω. Short-circuit current is rated at 75 mA, and the output stage remains stable with capacitive loads ≤5 pF-making it suitable for direct connection to 50 Ω coaxial cables with appropriate series termination. This capability is confirmed in Table 1 and Figure 15 of the AD835 datasheet Rev. E.

Does the AD835AR require external passive components for basic multiplier operation?

No-basic W = XY operation requires only power supply decoupling (4.7 µF tantalum + 0.01 µF ceramic per rail, per Figure 20) and grounding of unused differential inputs (e.g., X2 and Y2). The internal scaling voltage (U ≈ 1.05 V) eliminates need for external resistors unless precise 1 V/V gain is required. This minimal external component count is highlighted in the "Simple" and "Complete" features on page 1 of the AD835 datasheet.

Can the AD835AR operate from a single supply?

Yes-the AD835AR can operate from a single 9 V supply, as noted in the Wideband Voltage-Controlled Amplifier section (page 11). This requires biasing the Z input to mid-rail (4.5 V) and referencing X/Y inputs accordingly. However, dual ±5 V operation is recommended for full ±1 V input range and optimal PSRR performance, per Absolute Maximum Ratings and Table 1 conditions.

How does the Z input function beyond simple summing in the AD835AR?

In the AD835AR, the Z input enables voltage-controlled amplification by setting gain up to ×10 when Z is driven by a scaled version of W (via resistive feedback, Figure 20). It also permits carrier feedthrough cancellation in modulators (Figure 23) and DC offset nulling in phase detectors. These functions are enabled by the Z path's 250 MHz bandwidth and 0.995 typical gain, specified in Table 1 under "Summing Input (Z)".

What is the guaranteed operating temperature range for the AD835AR?

The AD835AR is specified for continuous operation from −40°C to +85°C, matching the industrial temperature grade defined in the Ordering Guide (page 14) and Absolute Maximum Ratings (page 5). Performance parameters-including 20 ns settling time, ±2.2 V output swing, and 50 nV/√Hz noise-are guaranteed across this full range, with derating data provided in Figures 16 (output offset drift) and Table 1 (temperature columns).