Part A
AD8361ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6139 個数
- Package
- TSSOP-8
- Series
- RF検波器
Replacement verdict
Not a drop-in replacement
The AD8369ARUZ and AD8361ARMZ are not drop-in replacements for one another. The AD8369ARUZ is a digitally controlled variable gain amplifier with a differential input and differential output, while the AD8361ARMZ is an RMS-responding power detector with a single-ended input and a linear voltage output. Their core functions, signal interfaces, and package footprints differ, so substituting one for the other requires circuit redesign and validation.
Different function
Different output type
Different input interface
Different package footprint
Parts at a glance
Part B
AD8369ARUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4576 個数
- Package
- TSSOP-16
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8369ARUZ | AD8361ARMZ | Why it matters |
|---|---|---|---|
| Function | Digitally controlled variable gain amplifier (VGA) | RMS-responding power detector (RF/IF detector) | These are fundamentally different device types, so they are not functionally substitutable in a circuit. |
| Frequency Range | Up to 600 MHz | Up to 2.5 GHz | The usable operating bandwidth determines which signal frequencies each part can process. |
| Gain / Dynamic Range | -10 dB to +35 dB digitally controlled gain | ~30 dB measurement dynamic range | The VGA provides adjustable signal gain, while the detector provides a measurement range, reflecting different signal-chain roles. |
| Output Type | Amplified RF output signal | Linear-in-dB DC voltage proportional to input RMS power | One delivers an RF signal, the other a DC measurement voltage, so their outputs are not interchangeable. |
| Control Interface | Digital parallel gain control (3-bit) | No gain control interface (detector) | The VGA requires digital control lines to set gain, whereas the detector has no such control requirement. |
| Supply Voltage | 5 V typical single supply | 2.7 V to 5.5 V single supply | Supply voltage compatibility affects whether the part can be powered from a given system rail. |
| Package | 16-lead TSSOP (RU suffix) | 8-lead MSOP (RM suffix) | Different package footprints and pin counts prevent direct board-level drop-in replacement. |
| Primary Application | Gain control in receive/transmit signal chains | RF power measurement and level detection | Their intended applications differ, so each serves a distinct role in an RF system. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8361ARMZ | AD8369ARUZ |
|---|---|---|
| Part Status | Active | Active |
| Frequency | 2.5GHz | - |
| RF Type | Cellular, CDMA, W-CDMA | - |
| Input Range | 0 ~ 700mV | - |
| Accuracy | ±0.25dB | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
| Supply Current | 1.1 mA | 37mA |
| Mounting Type | Surface Mount | Surface Mount |
| Series | - | X-AMP® |
| Amplifier Type | - | Variable Gain |
| Number of Circuits | - | 1 |
| Slew Rate | - | 1200V/µs |
| -3 dB Bandwidth | - | 600 MHz |
| Current - Input Bias | - | 160 µA |
| Voltage - Supply Span(Min) | - | 3 V |
| Voltage - Supply Span(Max) | - | 5.5 V |
| Operating Temperature | - | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the AD8369ARUZ and the AD8361ARMZ?
The AD8369ARUZ is a digitally controlled variable gain amplifier (VGA) operating over a 600 MHz bandwidth with a gain range of -5 dB to +40 dB, controlled via a 4-bit parallel interface. The AD8361ARMZ is an RMS-responding power detector (RF power measurement IC) operating from DC to 2.5 GHz that converts RF input power to a linear DC output voltage. They serve fundamentally different signal-chain functions: one amplifies with programmable gain, the other measures RF power.
Are the AD8369ARUZ and AD8361ARMZ pin-to-pin or footprint compatible?
No. The AD8369ARUZ is supplied in a 16-lead TSSOP package, while the AD8361ARMZ is supplied in an 8-lead MSOP package. The package types, pin counts, and pin functions differ, so they are not footprint-compatible and cannot be interchanged on the same PCB land pattern.
What supply voltage and current consumption does each device require?
The AD8369ARUZ operates from a single 3.3 V supply (range 3.0 V to 3.6 V) and typically draws about 40 mA. The AD8361ARMZ operates from a single 2.7 V to 5.5 V supply and typically draws about 1.1 mA. The power detector is therefore a much lower-power device, consistent with its measurement rather than amplification role.
What frequency range does each part support?
The AD8369ARUZ VGA is specified for operation up to 600 MHz. The AD8361ARMZ RMS power detector is specified from DC to 2.5 GHz. The detector therefore covers a much wider frequency range, while the VGA is intended for lower-frequency gain-control applications.
Can the AD8369ARUZ and AD8361ARMZ be used together in the same RF signal chain?
Yes, they can serve complementary roles. The AD8369ARUZ can provide digitally controlled gain in the signal path, while the AD8361ARMZ can measure the resulting RF power level and provide a DC output for closed-loop power control or monitoring. Their different supply voltages and interfaces must be accounted for in the system design.
What is the gain control interface of the AD8369ARUZ compared with the AD8361ARMZ output?
The AD8369ARUZ uses a 4-bit parallel digital control interface to select gain in steps across its -5 dB to +40 dB range. The AD8361ARMZ has no digital control interface; it provides an analog DC output voltage proportional to the RMS value of the input RF signal. One is a digitally programmed actuator, the other an analog measurement output.
Which device is appropriate for RF power measurement and which for signal amplification?
The AD8361ARMZ is the appropriate choice for RF power measurement because it is an RMS-responding detector with a linear DC output. The AD8369ARUZ is the appropriate choice for signal amplification with programmable gain because it is a VGA with a 4-bit gain-control interface. Selecting between them depends on whether the design requires gain control or power detection.