Analog Devices Inc. AD847JRZ

Overview

AD847JRZ from Analog Devices is a high-speed, low-power monolithic operational amplifier optimized for video, imaging, and high-speed data acquisition systems. It delivers 50 MHz unity-gain bandwidth, 300 V/µs slew rate, and 0.04% differential gain (NTSC/PAL) while consuming only 5.3 mA at ±15 V - enabling use as a flash ADC input buffer or video line driver in compact, power-sensitive designs.

For engineers reviewing the AD847JRZ datasheet, AD847JRZ pinout, AD847JRZ application, or AD847JRZ equivalent, key selection considerations include its unity-gain stability with any capacitive load, 65 ns settling time to 0.1%, ±5 V to ±15 V dual-supply operation, and SOIC-8 packaging suitable for high-density PCB layouts.

Technical Context

The AD847JRZ employs Analog Devices' complementary bipolar (CB) process with npn input stage and fast pnp folded-cascode gain stage, enabling simultaneous high dc precision and wide ac bandwidth. Its internal compensation ensures unity-gain stability without external components, and the output stage includes bootstrapped capacitance (CF) to maintain stability when driving up to 1000 pF loads.

It features matched input bias currents (±5 V: 3.3–6.6 µA), low input offset voltage (0.5 mV typ), and high open-loop gain (5.5 V/mV at ±15 V, R_L = 1 kΩ). Common-mode rejection exceeds 78 dB across ±5 V and ±15 V supplies, supporting robust performance in noisy industrial or video signal chains.

Key Specifications

Pinout & Package

AD847JRZ is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package (R-8), measuring 4.90 mm × 3.91 mm × 1.75 mm, with gull-wing leads and 1.27 mm pitch. This RoHS-compliant surface-mount package supports automated assembly and thermal dissipation up to 0.8 W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed op amp applications.

Compared with AD827ARZ and LM6361MAX/NOPB, the AD847JRZ uniquely combines broadcast-grade video performance, single-channel efficiency, and guaranteed capacitive-load stability - making it the optimal choice for space- and fidelity-critical signal chain nodes.

Availability

AD847JRZ is available at Aetrix Electronics and suitable for video instrumentation, imaging equipment, and high-speed data acquisition systems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for AD847JRZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD847JRZ belongs to Analog Devices' high-speed precision op amp product line, engineered specifically for demanding video, instrumentation, and data converter interface applications where bandwidth, settling accuracy, and dc precision must coexist.

FAQ

What is the maximum capacitive load the AD847JRZ can drive while remaining stable?

The AD847JRZ is internally compensated for unity-gain operation and remains stable when driving any capacitive load - including up to 1000 pF as verified in Figure 24 of the AD847 datasheet. No external compensation is required, even with unterminated coaxial cables or ADC input capacitance. This behavior is intrinsic to its CB-process output stage and bootstrapped CF capacitor, making AD847JRZ ideal for DAC output buffering and video line driving without layout-dependent tuning.

Does the AD847JRZ support single-supply operation?

The AD847JRZ is specified for dual-supply operation only (±4.5 V to ±18 V) and does not support true single-supply use. Its input common-mode range extends to within 0.7 V of each rail (e.g., –13.4 V to +14.3 V at ±15 V), but the input stage requires both positive and negative supplies to function. For single-ended systems, level-shifting circuitry or a dedicated single-supply op amp (e.g., AD8031) must be used instead of AD847JRZ.

What is the purpose of Pins 1 and 5 on the AD847JRZ?

Pins 1 and 5 on the AD847JRZ are offset null terminals connected to the internal input stage's trimming network. A 10 kΩ potentiometer wired between these pins-with its wiper grounded-allows manual adjustment of input offset voltage down to <0.1 mV. This feature is rarely needed in modern designs due to the AD847JRZ's inherently low 0.5 mV typical offset, but remains valuable for ultra-precision dc-coupled instrumentation where residual offset must be minimized.

How does the AD847JRZ compare to the AD811 in video performance?

The AD847JRZ offers 0.04% differential gain and 0.19° differential phase at 4.4 MHz, while the AD811 achieves superior 0.01% and 0.01° - making AD811 suitable for high-end broadcast and HDTV. However, AD847JRZ consumes only 5.3 mA versus AD811's 16 mA, costs significantly less, and provides adequate fidelity for SDTV, medical imaging, and industrial vision. AD847JRZ is the pragmatic choice where performance/cost/power trade-offs favor efficiency over ultimate video linearity.

Is the AD847JRZ pin-compatible with the LM6361?

Yes - the AD847JRZ and LM6361 share identical SOIC-8 pinouts (R-8 package), including power, input, output, and offset null pin assignments. This allows direct replacement in existing LM6361 layouts. However, AD847JRZ delivers higher bandwidth (50 MHz vs. 45 MHz), lower supply current (5.3 mA vs. 7.5 mA), and guaranteed video specifications absent in the LM6361, making it a functional and performance upgrade without PCB modification.