Part A
AD8361ARM
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6375 Stückzahl
- Package
- TSSOP-8
- Series
- HF-Detektoren
Replacement verdict
Not a drop-in replacement
The AD8361ARM and AD8369ARU are not functionally interchangeable: the AD8361ARM is a single-channel RMS-responding RF power detector, while the AD8369ARU is a digitally controlled variable gain amplifier. Their core functions, signal-chain roles, package footprints, and control interfaces differ fundamentally, so neither part can directly substitute for the other in an existing design.
Different core function
Different output type
Different package footprint
Different control interface
Parts at a glance
Part B
AD8369ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6380 Stückzahl
- Package
- TSSOP-16
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8361ARM | AD8369ARU | Why it matters |
|---|---|---|---|
| Function | RMS-responding power detector (LF to 2.5 GHz) | Digitally controlled variable gain amplifier (VGA) | These are fundamentally different signal-chain functions, so they are not direct substitutes in a circuit. |
| Frequency Range | LF to 2.5 GHz | LF to 600 MHz | Operating frequency range determines whether the part can be used in the target RF band. |
| Primary Output / Gain | Linear-in-dB DC output proportional to input RMS power | Voltage gain adjustable from -10 dB to +40 dB | The output type defines how the device interfaces with downstream circuitry (detector voltage vs. amplified signal). |
| Control Interface | None (measurement device) | 3-wire serial digital control (gain setting) | A digital control interface is required to set gain in the VGA, whereas the detector needs no control. |
| Supply Voltage | 2.7 V to 5.5 V | 3.0 V to 5.5 V | Supply range affects compatibility with the system power rail. |
| Supply Current | ~1.1 mA typical | ~28 mA typical | Power consumption impacts thermal budget and battery life in portable designs. |
| Package | 8-lead MSOP | 16-lead TSSOP | Package footprint and pin count affect PCB layout and cannot be swapped without redesign. |
| Input Signal Type | RF input to be measured (RMS detection) | RF input to be amplified with controlled gain | The role of the input pin differs (sense vs. amplify), which determines circuit topology. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8361ARM | AD8369ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | X-AMP® |
| Part Status | Obsolete | Obsolete |
| Amplifier Type | - | Variable Gain |
| Number of Circuits | - | 1 |
| Slew Rate | - | 1200V/µs |
| -3 dB Bandwidth | - | 600 MHz |
| Current - Input Bias | - | 160 µA |
| Supply Current | 1.1 mA | 37mA |
| Voltage - Supply Span(Min) | - | 3 V |
| Voltage - Supply Span(Max) | - | 5.5 V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Frequency | 2.5GHz | - |
| RF Type | Cellular, CDMA, W-CDMA | - |
| Input Range | 0 ~ 700mV | - |
| Accuracy | ±0.25dB | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
Frequently asked questions
What are the primary functional differences between the AD8361ARM and the AD8369ARU?
The AD8361ARM is a 2.5 GHz TruPwr RMS-responding power detector intended for RF power measurement, while the AD8369ARU is a 600 MHz digitally controlled variable gain amplifier (VGA) with a 45 dB gain range. They serve different signal-chain roles: power detection versus gain control/amplification.
Are the AD8361ARM and AD8369ARU pin-compatible or package-compatible?
No. The AD8361ARM is supplied in an 8-lead MSOP package, and the AD8369ARU is supplied in a 16-lead TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What frequency ranges do the AD8361ARM and AD8369ARU support?
The AD8361ARM operates from DC to 2.5 GHz as an RMS power detector. The AD8369ARU is specified for operation from DC to 600 MHz as a variable gain amplifier.
How is gain or output controlled on each device?
The AD8369ARU gain is digitally programmed through a parallel control interface providing 45 dB of gain range in 3 dB steps. The AD8361ARM does not provide gain control; it produces an output voltage proportional to the RMS value of the input signal.
Can the AD8361ARM and AD8369ARU be used together in the same RF signal chain?
Yes, they can serve complementary roles. The AD8369ARU can provide variable gain amplification, and the AD8361ARM can be used for RMS power detection at a relevant point in the chain, provided each device's frequency range and supply requirements are respected.
What are the supply voltage requirements for the AD8361ARM and AD8369ARU?
The AD8361ARM operates from a single 2.7 V to 5.5 V supply. The AD8369ARU operates from a single 3.0 V to 5.5 V supply. Designers should verify the exact specified operating conditions in the respective manufacturer datasheets.
Are the AD8361ARM and AD8369ARU interchangeable in an existing design?
No. Because they differ in function, package, pinout, frequency range, and control interface, they are not interchangeable. Any substitution would require a redesign of the surrounding circuit and validation against the manufacturer datasheets.