Part A
AD8306AR
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 7304 PCS
- Package
- SOIC-16
- Series
- 선형 증폭기 - 전용
Replacement verdict
Not a drop-in replacement
The AD8306AR and AD8307ARZ-REEL are not functionally interchangeable despite sharing the same SOIC-8 footprint and logarithmic amplifier architecture. The AD8306AR is a limiting logarithmic amplifier with RSSI and phase-matched outputs intended for FM demodulation and signal-strength measurement up to 400 MHz, while the AD8307ARZ-REEL is a DC-coupled logarithmic detector optimized for accurate RSSI over a 500 MHz bandwidth with a calibrated 25 mV/dB slope. Their differing output signal conditioning, input coupling, and dynamic-range behavior mean a direct board swap will not preserve circuit performance, so the AD8307ARZ-REEL should only be considered after a full redesign and validation of the surrounding signal chain.
Different output signal type
Different input coupling
Different dynamic range
Different frequency response
Parts at a glance
Part B
AD8307ARZ-REEL
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 5962 PCS
- Package
- SOIC-8
- Series
- 선형 증폭기 - 전용
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8306AR | AD8307ARZ-REEL | Why it matters |
|---|---|---|---|
| Function | Limiting logarithmic amplifier / RSSI | Logarithmic amplifier / RSSI | Defines the core signal-processing role; the AD8306 includes a limiting output stage for demodulation, while the AD8307 is a pure log detector. |
| Frequency Range | DC to 400 MHz | DC to 500 MHz | Determines the maximum input signal frequency the device can reliably process. |
| Dynamic Range | ~100 dB | ~92 dB | Sets the span of input power levels over which accurate logarithmic detection is maintained. |
| Logarithmic Slope | 20 mV/dB | 25 mV/dB | Defines the output voltage change per dB of input; affects scaling and downstream ADC resolution requirements. |
| Logarithmic Intercept | -95 dBm | -84 dBm | Reference point for the log transfer function; determines the calibrated power reading at a given output voltage. |
| Supply Voltage | 2.7 V to 6.5 V | 2.7 V to 5.5 V | Must match the system power rail; the AD8306 tolerates a slightly higher maximum supply. |
| Supply Current | ~16 mA | ~7.5 mA | Affects power budget and thermal design, especially in portable or densely packed systems. |
| Package | 20-Lead SOIC (R-20) | 8-Lead SOIC (R-8) | Footprint and pin count differ, so PCB layout and assembly are not drop-in compatible. |
| Limiting Output | Yes (differential limiting amplifier output) | No | The AD8306 can drive demodulators or comparators directly; the AD8307 provides only the log/RSSI output. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8306AR | AD8307ARZ-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Active |
| Type | Limiting-Logarithmic Amplifier | Logarithmic Amplifier |
| Applications | Receiver Signal Strength Indication (RSSI) | Receiver Signal Strength Indication (RSSI) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD8306AR and AD8307ARZ-REEL?
The AD8306AR is a complete 100 MHz to 400 MHz limiting logarithmic amplifier (demodulating logarithmic amplifier) that provides both received signal strength indication (RSSI) and a limited output, while the AD8307ARZ-REEL is a 500 MHz, 92 dB logarithmic amplifier (log amp) intended primarily for RSSI and signal strength measurement. The AD8306AR integrates a limiting amplifier chain with an RSSI output and a hard-limited output, whereas the AD8307ARZ-REEL provides a single logarithmic (RSSI) output without a limiting output stage.
Are the AD8306AR and AD8307ARZ-REEL pin-compatible or package-compatible?
No. The AD8306AR is supplied in a 16-lead SOIC package, while the AD8307ARZ-REEL is supplied in an 8-lead SOIC package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
What frequency range does each device support?
The AD8306AR operates over a specified frequency range of 100 MHz to 400 MHz. The AD8307ARZ-REEL operates over a specified frequency range of DC to 500 MHz. The usable frequency ranges therefore differ, and the AD8307ARZ-REEL extends to lower frequencies and a higher upper limit than the AD8306AR.
How do the logarithmic dynamic ranges of the AD8306AR and AD8307ARZ-REEL compare?
The AD8306AR provides a logarithmic dynamic range of approximately 90 dB. The AD8307ARZ-REEL provides a logarithmic dynamic range of approximately 92 dB. Both are high-dynamic-range log amps, but the specified dynamic range figures differ slightly and should be verified against the respective datasheets for the exact test conditions.
Does the AD8306AR provide a limited output that the AD8307ARZ-REEL does not?
Yes. The AD8306AR includes a limiting amplifier output in addition to its RSSI (logarithmic) output, making it suitable for applications requiring both signal strength measurement and a limited signal path. The AD8307ARZ-REEL provides only a logarithmic (RSSI) output and does not include a limiting output stage.
What are the supply voltage and current requirements for these devices?
Both the AD8306AR and AD8307ARZ-REEL operate from a single supply in the range of 2.7 V to 5.5 V. Typical supply current for the AD8306AR is approximately 16 mA, while the AD8307ARZ-REEL typically draws approximately 7.5 mA. Exact values should be confirmed against the manufacturer datasheets for the specific operating conditions.
Can the AD8306AR and AD8307ARZ-REEL be used interchangeably in an existing design?
No, they cannot be used interchangeably without design changes. The devices differ in package (16-lead SOIC vs 8-lead SOIC), pin functions, frequency range, dynamic range, supply current, and output configuration (the AD8306AR includes a limiting output while the AD8307ARZ-REEL does not). A redesign of the PCB and validation of all parameters against the target datasheet would be required.