Part A
AD8302ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4149 PCS
- Package
- TSSOP-14
- Series
- RF Detectors
Replacement verdict
Not a drop-in replacement
The AD8309ARUZ and AD8302ARUZ are not drop-in replacements for one another. Although both are analog logarithmic/RF signal-processing ICs in the same TSSOP-16 package, they differ fundamentally in function, channel count, and output architecture, so substituting one for the other requires circuit redesign and full validation.
Different output type
Different channel count
Different functional architecture
Different supply and interface requirements
Parts at a glance
Part B
AD8309ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6696 PCS
- Package
- TSSOP-16
- Series
- Linear - Amplifiers - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8309ARUZ | AD8302ARUZ | Why it matters |
|---|---|---|---|
| Function | Demodulating logarithmic amplifier (RSSI) | RF/IF gain and phase detector | These are fundamentally different signal-processing functions, so they are not direct substitutes in a circuit. |
| Frequency Range | 5 MHz to 500 MHz | DC to 2.7 GHz | The operating frequency band determines whether the part can be used in the target RF/IF signal chain. |
| Dynamic Range | 100 dB | 60 dB (gain/phase measurement range) | Dynamic range defines the span of signal levels the device can accurately process. |
| Output Type | Logarithmic (RSSI) voltage output | Two analog outputs: gain (magnitude ratio) and phase difference | The output format must match the downstream ADC or control circuitry. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Supply range affects compatibility with the system power rail. |
| Package | 16-lead TSSOP | 14-lead TSSOP | Package and pin count affect PCB footprint and layout compatibility. |
| Supply Current | 16 mA typical | 28 mA typical | Power consumption impacts thermal design and battery-operated applications. |
| Primary Application | Received signal strength indication (RSSI), signal level measurement | Gain and phase measurement, VSWR/return loss, RF power amplifier control | Intended application indicates the circuit role and whether the part fits the design goal. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8302ARUZ | AD8309ARUZ |
|---|---|---|
| Part Status | Active | Active |
| Frequency | 2.7GHz | - |
| RF Type | General Purpose | - |
| Input Range | -60dBm ~ 0dBm | - |
| Accuracy | ±0.5dB | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
| Supply Current | 23 mA | - |
| Mounting Type | Surface Mount | Surface Mount |
| Type | - | Logarithmic Amplifier |
| Applications | - | Receiver Signal Strength Indication (RSSI) |
Frequently asked questions
What are the primary functional differences between the AD8309ARUZ and AD8302ARUZ?
The AD8309ARUZ is a demodulating logarithmic amplifier (log amp) that provides a RSSI (received signal strength indicator) output and a limited output, operating from DC to 500 MHz. The AD8302ARUZ is a gain and phase detector that measures the amplitude ratio and phase difference between two independent input signals, operating from LF to 2.7 GHz. They serve different signal-processing roles and are not functionally interchangeable.
Do the AD8309ARUZ and AD8302ARUZ share the same package and pinout?
Both devices are offered in a 16-lead TSSOP package (RU suffix), but their pin functions and internal architectures differ. The AD8309ARUZ provides logarithmic/RSSI outputs and a limiter output, while the AD8302ARUZ provides gain and phase measurement outputs with two RF inputs. PCB layouts and pin assignments must be designed per each device's respective datasheet.
What frequency ranges do the AD8309ARUZ and AD8302ARUZ support?
The AD8309ARUZ operates from DC to 500 MHz. The AD8302ARUZ operates from low frequency up to 2.7 GHz. The AD8302ARUZ therefore covers a much wider frequency range suitable for RF and microwave gain/phase measurements, while the AD8309ARUZ is intended for lower-frequency log/RSSI applications.
Can the AD8302ARUZ be used as a direct replacement for the AD8309ARUZ in an RSSI circuit?
No. The AD8309ARUZ is a logarithmic amplifier providing an RSSI output proportional to input signal strength, whereas the AD8302ARUZ measures gain (amplitude ratio) and phase difference between two inputs. The AD8302ARUZ does not provide a single-channel RSSI output equivalent to the AD8309ARUZ, so it cannot serve as a direct replacement in RSSI applications.
What are the typical applications for the AD8309ARUZ versus the AD8302ARUZ?
The AD8309ARUZ is typically used for RSSI measurement, received signal strength indication, and logarithmic amplification in receivers and test equipment up to 500 MHz. The AD8302ARUZ is used for RF gain and phase measurement, such as in vector network analysis, amplifier characterization, and RF power control systems up to 2.7 GHz.
Are the AD8309ARUZ and AD8302ARUZ both specified for operation over the same temperature range?
Both devices are specified for the industrial temperature range of −40°C to +85°C, as stated in their respective manufacturer datasheets. Designers should still verify the exact operating conditions and derating requirements for their specific application.
What supply voltage do the AD8309ARUZ and AD8302ARUZ require?
Both the AD8309ARUZ and AD8302ARUZ operate from a single supply voltage of 2.7 V to 5.5 V, per their datasheets. This common supply range simplifies power design when either device is used, but the surrounding circuitry and output interfaces differ between the two parts.