Part A
AD8302ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4149 PCS
- Package
- TSSOP-14
- Series
- RF Detectors
Replacement verdict
Not a drop-in replacement
The AD8302ARUZ and AD8303JRU are not functionally interchangeable. The AD8302ARUZ is a dual-channel logarithmic RF/IF gain and phase detector, while the AD8303JRU is a single-channel logarithmic amplifier. Their differing channel count, output signal type, package footprint, and core function prevent direct substitution in existing designs.
Different channel count
Different output type
Different package footprint
Different core function
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8302ARUZ | AD8303JRU | Why it matters |
|---|---|---|---|
| Function | RF/IF gain and phase detector | Logarithmic amplifier / RSSI detector | These are fundamentally different signal-processing functions, so they are not direct substitutes in a circuit. |
| Frequency Range | LF to 2.7 GHz | DC to 500 MHz (typical) | Operating frequency range determines whether the part can be used in the target signal chain. |
| Primary Output | Gain (magnitude) and phase outputs | Logarithmic (dB-linear) voltage output | The output type dictates what downstream circuitry or ADC can interface with the device. |
| Package | 16-lead TSSOP | 14-lead TSSOP | Package and pin count affect PCB footprint and layout compatibility. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Supply range must match the system rail; here both are compatible. |
| Number of Channels | 2 (dual channel for gain/phase) | 1 (single channel) | Channel count affects whether the part can measure relative gain/phase between two signals. |
| Typical Application | RF power amplifier gain/phase monitoring, VSWR measurement | RSSI, received signal strength indication, log conversion | Application fit determines functional substitutability in a given design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8302ARUZ | AD8303JRU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| 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 | - |
Frequently asked questions
Are the AD8302ARUZ and AD8303JRU functionally interchangeable?
No. The AD8302ARUZ is a 2.7 GHz RF/IF gain and phase detector, while the AD8303JRU is a 3 V, 12-bit successive-approximation ADC. They serve entirely different functions and are not interchangeable.
What are the primary functions of the AD8302ARUZ and AD8303JRU?
The AD8302ARUZ measures gain (amplitude ratio) and phase difference between two RF/IF input signals. The AD8303JRU is a 12-bit analog-to-digital converter that digitizes a single analog input voltage.
How do the package types of the AD8302ARUZ and AD8303JRU compare?
The AD8302ARUZ is supplied in a 14-lead TSSOP package (RU suffix). The AD8303JRU is supplied in a 20-lead SOIC package (RU suffix). The packages differ in pin count and footprint, so PCB land patterns are not compatible.
What are the operating frequency ranges of the AD8302ARUZ and AD8303JRU?
The AD8302ARUZ operates over an input frequency range from low frequency up to 2.7 GHz. The AD8303JRU is a baseband ADC and does not have an RF input frequency range; its analog input is a DC-to-low-frequency voltage signal.
What supply voltages do the AD8302ARUZ and AD8303JRU require?
The AD8302ARUZ operates from a single 2.7 V to 5.5 V supply. The AD8303JRU operates from a single 3 V supply (2.7 V to 3.6 V range). Both are single-supply parts, but their specified supply ranges differ.
What are the output interfaces of the AD8302ARUZ and AD8303JRU?
The AD8302ARUZ provides two analog output voltages: one proportional to gain (amplitude ratio) and one proportional to phase difference. The AD8303JRU provides a 12-bit digital output over a serial interface.
Can the AD8302ARUZ and AD8303JRU be used together in a signal chain?
Yes, they can serve complementary roles: the AD8302ARUZ can perform RF/IF gain and phase measurement, and the AD8303JRU can digitize the resulting analog output voltages for a microcontroller or DSP. This is a system-level pairing, not a substitution.
Which part should be selected for RF gain and phase measurement versus analog-to-digital conversion?
Select the AD8302ARUZ for RF/IF gain and phase detection up to 2.7 GHz. Select the AD8303JRU when a 12-bit, 3 V successive-approximation ADC is required for digitizing an analog voltage.