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 AD8304ARUZ-RL7 and AD8302ARUZ are not drop-in replacements for one another. The AD8304ARUZ-RL7 is a single-channel logarithmic detector optimized for optical power measurement with a 160 dB dynamic range, while the AD8302ARUZ is a dual-channel gain and phase detector intended for RF/IF signal analysis. Their differing channel count, measurement function, output format, and supply requirements make direct substitution impractical without redesign.
Different channel count
Different measurement function
Different output type
Different supply requirements
Parts at a glance
Part B
AD8304ARUZ-RL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7243 PCS
- Package
- TSSOP-14
- 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 | AD8304ARUZ-RL7 | AD8302ARUZ | Why it matters |
|---|---|---|---|
| Function | Logarithmic converter (log amp) | RF/IF gain and phase detector | These are fundamentally different signal-processing functions, so they are not direct substitutes in a circuit. |
| Frequency Range | DC to 160 MHz (input bandwidth) | DC to 2.7 GHz | The usable input frequency range determines which applications each part can serve. |
| Dynamic Range | 160 dB (80 dB per decade, 10 nA to 1 mA) | ±30 dB (gain measurement range) | Dynamic range defines the span of signal levels the device can accurately measure. |
| Output Type | Voltage output proportional to log of input current | Two voltage outputs: gain (magnitude ratio) and phase difference | The output format dictates how the device interfaces with downstream ADCs or control loops. |
| Input Signal Type | Photodiode current (logarithmic current input) | Two RF/IF voltage inputs (differential) | The input interface must match the sensor or signal source in the target application. |
| Supply Voltage | 3.0 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. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Both share the same industrial temperature range, so thermal environment compatibility is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8302ARUZ | AD8304ARUZ-RL7 |
|---|---|---|
| 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 Converter |
| Applications | - | Fiber Optics |
Frequently asked questions
What are the primary functions of the AD8304ARUZ-RL7 and AD8302ARUZ?
The AD8304ARUZ-RL7 is a logarithmic converter optimized for photodiode interfacing, providing a 160 dB dynamic range with a logarithmic slope of 10 mV/dB. The AD8302ARUZ is a gain and phase detector that measures amplitude ratio and phase difference between two input signals, operating from DC to 2.7 GHz.
Can the AD8304ARUZ-RL7 and AD8302ARUZ be used interchangeably in a design?
No. The AD8304ARUZ-RL7 is a logarithmic amplifier for optical power measurement, while the AD8302ARUZ is a gain/phase detector for RF signal comparison. Their functions, input interfaces, and output formats differ fundamentally, so they are not interchangeable.
Do the AD8304ARUZ-RL7 and AD8302ARUZ use the same package and pinout?
Both devices are offered in a 16-lead TSSOP package (RU suffix), but their pin functions and internal circuitry differ. The AD8304ARUZ-RL7 pinout is configured for photodiode input and logarithmic output, while the AD8302ARUZ pinout supports two RF inputs and gain/phase outputs. PCB layouts must follow the respective datasheet pin descriptions.
What are the key dynamic range specifications for each device?
The AD8304ARUZ-RL7 provides a 160 dB logarithmic dynamic range (specified over 100 dB at 25°C with 10 mV/dB slope). The AD8302ARUZ measures gain over a ±30 dB range and phase over a 0° to 180° range, with specified operation from DC to 2.7 GHz.
What supply voltage and current requirements apply to these devices?
Both the AD8304ARUZ-RL7 and AD8302ARUZ operate from a single 3 V to 5.5 V supply. The AD8304ARUZ-RL7 typically draws about 4.5 mA, while the AD8302ARUZ typically draws about 19 mA. Consult the respective datasheets for exact quiescent current limits over temperature.
Which device is appropriate for RF gain and phase measurement?
The AD8302ARUZ is the correct choice for RF gain and phase measurement, as it directly outputs voltages proportional to the amplitude ratio and phase difference of two input signals up to 2.7 GHz. The AD8304ARUZ-RL7 is not intended for this function.
Which device is appropriate for photodiode optical power measurement?
The AD8304ARUZ-RL7 is designed for photodiode interfacing and optical power measurement, converting photodiode current to a logarithmic voltage output over a wide dynamic range. The AD8302ARUZ is not specified for photodiode current input.
Are evaluation boards or reference designs available for these parts?
Analog Devices provides evaluation boards for both devices: the AD8304-EVALZ for the AD8304ARUZ-RL7 and the AD8302-EVALZ for the AD8302ARUZ. These boards follow the manufacturer datasheet application circuits and are documented on the Analog Devices website.