Part A
AD8361ARM
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6375 PCS
- Package
- TSSOP-8
- Series
- Détecteur RF
Replacement verdict
Not a drop-in replacement
The AD8369ARUZ and AD8361ARM are not functionally interchangeable. The AD8369ARUZ is a digitally controlled variable gain amplifier with a differential input and output, while the AD8361ARM is a fixed-gain RMS-responding power detector with a single-ended voltage output. Their differing signal-chain roles, output formats, gain control methods, and supply requirements make direct substitution impractical without redesign.
Different output type
Different gain control
Different signal function
Different supply range
Parts at a glance
Part B
AD8369ARUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4576 PCS
- Package
- TSSOP-16
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
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 | AD8361ARM | Why it matters |
|---|---|---|---|
| Function | Digitally controlled variable gain amplifier (VGA) | RMS-responding power detector | These are fundamentally different functions; one amplifies with programmable gain while the other measures signal power, so they are not direct substitutes. |
| Frequency Range | Up to 600 MHz | Up to 2.5 GHz | The usable operating bandwidth determines whether the part suits the target signal chain frequency. |
| Gain / Measurement Range | -10 dB to +35 dB (45 dB range, 3 dB steps) | Linear-in-dB output over ~30 dB input range | Defines the dynamic range and control resolution available for the application. |
| Output Type | Differential amplified RF output | DC voltage proportional to input RMS power | The output interface must match the downstream stage (ADC, detector loop, or next RF block). |
| Control Interface | Parallel digital gain control (3-bit) | No gain control; continuous analog output | Programmability affects system architecture and whether closed-loop AGC is possible. |
| Supply Voltage | 5 V | 2.7 V to 5.5 V | Supply compatibility determines whether the part fits the existing power rail design. |
| Package | 16-lead TSSOP | 8-lead MSOP | Footprint and pin count affect PCB layout and board space. |
| Primary Application | Receive/transmit gain control in RF signal chains | RF power measurement and AGC detection | Application role clarifies whether the part can serve as a functional replacement in a given design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8361ARM | AD8369ARUZ |
|---|---|---|
| Part Status | Obsolete | 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 AD8361ARM?
The AD8369ARUZ is a digitally controlled variable gain amplifier (VGA) operating from DC to 600 MHz with a gain range of -5 dB to +40 dB, controlled via a 4-bit parallel or 3-wire serial interface. The AD8361ARM is an RMS-responding power detector (RF/IF RMS-to-DC converter) operating from DC to 2.5 GHz that produces a linear-in-V/V output proportional to the RMS value of the input signal. They serve fundamentally different signal-chain functions: variable gain amplification versus RMS power measurement.
Are the AD8369ARUZ and AD8361ARM pin-compatible or package-compatible?
No. The AD8369ARUZ is supplied in a 16-lead TSSOP package (RU suffix), while the AD8361ARM is supplied in an 8-lead MSOP package (RM suffix). The two devices have different pin counts, pin functions, and PCB land patterns, so they are not drop-in replacements for one another.
What are the operating frequency ranges of the AD8369ARUZ and AD8361ARM?
The AD8369ARUZ VGA is specified for operation from DC to 600 MHz. The AD8361ARM RMS power detector is specified for operation from DC to 2.5 GHz. The AD8361ARM therefore covers a substantially wider frequency range suitable for higher-frequency RF power measurement, while the AD8369ARUZ is intended for gain control within its 600 MHz bandwidth.
How is gain or output controlled on each device?
The AD8369ARUZ gain is programmed digitally through a 4-bit control interface (parallel or 3-wire serial), providing 16 gain steps across its -5 dB to +40 dB range. The AD8361ARM has no gain control interface; its output is an analog voltage that varies linearly with the RMS input signal level, with the output scaling set by the supply voltage and configuration.
What are the supply voltage requirements for the AD8369ARUZ and AD8361ARM?
The AD8369ARUZ operates from a single 3.3 V supply (nominally 3.0 V to 3.6 V). The AD8361ARM operates from a single 2.7 V to 5.5 V supply. Designers should verify exact limits against the respective manufacturer datasheets for the target operating conditions.
Can the AD8369ARUZ and AD8361ARM be used together in the same RF signal chain?
Yes, they are complementary rather than competing devices. A typical architecture could use the AD8369ARUZ as a digitally controlled VGA to set signal gain and the AD8361ARM as an RMS detector to measure the resulting signal power for closed-loop leveling or power monitoring. Their differing frequency ranges should be considered: the AD8361ARM extends to 2.5 GHz while the AD8369ARUZ is specified to 600 MHz.
Which device is appropriate for RF power measurement versus gain control?
For RF/IF RMS power measurement, the AD8361ARM is the appropriate choice because it is an RMS-responding detector with a linear-in-V/V output. For digitally programmable gain adjustment in a signal path, the AD8369ARUZ is the appropriate choice because it is a VGA with a 4-bit digital gain control interface. Selecting between them depends on whether the application requires signal level measurement or signal level adjustment.