Part A
AD8304ARU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2030 PCS
- Series
- Amplificateurs linéaires - amplificateurs spéciaux
Replacement verdict
Not a drop-in replacement
The AD8302ARUZ-RL7 and AD8304ARU are not functionally interchangeable despite sharing the same TSSOP-14 package and similar supply requirements. The AD8302 is a dual-channel gain and phase detector operating over a 2.7 GHz range, while the AD8304 is a single-channel logarithmic converter optimized for fiber-optic photodiode measurement with a 160 dB dynamic range. Their core signal-processing functions, channel configurations, and input interfaces differ fundamentally, so substituting one for the other is not feasible without redesigning the surrounding circuit.
Different signal function
Different channel count
Different input interface
Different dynamic range
Parts at a glance
Part B
AD8302ARUZ-RL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2916 PCS
- Package
- TSSOP-14
- Series
- Détecteur RF
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-RL7 | AD8304ARU | Why it matters |
|---|---|---|---|
| Function | RF/IF gain and phase detector | Logarithmic amplifier (log amp) for photodiode detection | The core function differs fundamentally; one measures gain/phase between two signals while the other converts a photodiode current to a logarithmic voltage, so they are not functionally interchangeable. |
| Frequency / Bandwidth | DC to 2.7 GHz | DC to 160 MHz (bandwidth) | Operating frequency range determines whether the part suits the target signal band; the AD8302 covers much higher RF frequencies than the AD8304. |
| Primary Output | Two analog outputs: gain (magnitude) and phase difference | Single logarithmic voltage output proportional to input current | The output signal type and count dictate the downstream signal processing; the AD8302 provides two measurement channels while the AD8304 provides one log-voltage. |
| Input Type | Two AC-coupled RF inputs (differential/dual-channel) | Photodiode current input (single-ended) | Input interface compatibility determines what sensor or signal source can connect; the AD8304 is designed for photodiode current while the AD8302 accepts two RF voltage signals. |
| Dynamic Range | ~60 dB (gain measurement range) | ~80 dB (logarithmic input range, 100 dB optical) | Dynamic range defines the span of signal levels the device can accurately measure; the AD8304 offers a wider logarithmic range suited to optical power monitoring. |
| Supply Voltage | 2.7 V to 5.5 V | 3.0 V to 5.5 V | Supply voltage compatibility affects whether the part can be powered from the existing rail; the minimum supply differs slightly between the two. |
| Package | 16-lead TSSOP | 14-lead TSSOP | Package footprint and pin count affect PCB layout and drop-in compatibility; the two parts use different TSSOP sizes. |
| Typical Application | RF power amplifier gain/phase monitoring, VSWR measurement | Optical power monitoring, photodiode signal conditioning | Intended application indicates the design context; the AD8302 targets RF transmission systems while the AD8304 targets fiber-optic/optical sensing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8304ARU | AD8302ARUZ-RL7 |
|---|---|---|
| Part Status | Obsolete | Active |
| Base Product Number | AD8304 | - |
| Type | Logarithmic Converter | - |
| Applications | Fiber Optics | - |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tube | - |
| Frequency | - | 2.7GHz |
| RF Type | - | General Purpose |
| Input Range | - | -60dBm ~ 0dBm |
| Accuracy | - | ±0.5dB |
| Voltage - Supply | - | 2.7V ~ 5.5V |
| Supply Current | - | 23 mA |
Frequently asked questions
What are the primary functions of the AD8302ARUZ-RL7 and AD8304ARU?
The AD8302ARUZ-RL7 is a 2.7 GHz RF/IF gain and phase detector that measures the amplitude ratio and phase difference between two input signals. The AD8304ARU is a 160 dB logarithmic amplifier (log amp) designed for optical power measurement and general-purpose signal detection.
Can the AD8302ARUZ-RL7 and AD8304ARU be used interchangeably in a design?
No. The AD8302ARUZ-RL7 is a dual-channel gain/phase detector, while the AD8304ARU is a single-channel logarithmic amplifier. Their functions, input structures, and output interfaces differ, so they are not direct substitutes.
Do the AD8302ARUZ-RL7 and AD8304ARU use the same package?
Both devices are offered in a 16-lead TSSOP package (RU suffix). However, pin functions and internal circuitry differ, so PCB layouts and pin connections are not interchangeable between the two parts.
What is the operating frequency range of the AD8302ARUZ-RL7?
The AD8302ARUZ-RL7 operates from low frequency up to 2.7 GHz, making it suitable for RF and IF gain and phase measurements in applications such as transmitter/receiver calibration and VSWR monitoring.
What dynamic range does the AD8304ARU provide?
The AD8304ARU provides a 160 dB logarithmic dynamic range, which makes it well suited for optical power monitoring and wide-range signal level detection.
What are typical applications for the AD8302ARUZ-RL7 versus the AD8304ARU?
The AD8302ARUZ-RL7 is typically used for RF/IF gain and phase measurements, such as in RF power amplifier linearization and antenna VSWR monitoring. The AD8304ARU is typically used for optical power measurement, fiber-optic receiver signal strength indication, and wide-dynamic-range logarithmic detection.
Are the AD8302ARUZ-RL7 and AD8304ARU available in RoHS-compliant versions?
The AD8302ARUZ-RL7 is specified as a RoHS-compliant part, indicated by the "Z" in the ordering code. The AD8304ARU is also available in a RoHS-compliant version; designers should confirm the exact ordering code with the manufacturer's datasheet or authorized distributor.