Part A
AD8307ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6156 ПКС
- Package
- SOIC-8
- Series
- Линейные - Усилители - Специальное назначение
Replacement verdict
Not a drop-in replacement
The AD8307ARZ and AD8306ARZ-RL7 are both logarithmic amplifiers, but they are not interchangeable. The AD8307ARZ is a DC-to-500 MHz, 92 dB logarithmic amplifier/detector with a single-ended voltage output, while the AD8306ARZ-RL7 is a 5 MHz-to-400 MHz, 100 dB limiting logarithmic amplifier with a differential output and integrated RSSI. Their differing output architecture, bandwidth, and functional feature set require circuit redesign, so the AD8306ARZ-RL7 cannot serve as a direct drop-in replacement for the AD8307ARZ.
Different output type
Different bandwidth range
Different signal detection architecture
Different package and pinout
Parts at a glance
Part B
AD8306ARZ-RL7
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4522 ПКС
- Package
- SOIC-16
- Series
- Линейные - Усилители - Специальное назначение
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8307ARZ | AD8306ARZ-RL7 | Why it matters |
|---|---|---|---|
| Function | Logarithmic amplifier / RSSI detector (DC to 500 MHz) | Limiting amplifier with RSSI (DC to 400 MHz) | The core signal-processing function differs; the AD8307 is a pure log detector while the AD8306 includes a limiting amplifier output, so they are not drop-in substitutes. |
| Frequency Range | DC to 500 MHz | DC to 400 MHz | The usable input bandwidth determines whether the part covers the target signal band; the AD8307 extends to a higher frequency. |
| Dynamic Range | 92 dB | 100 dB | Dynamic range sets the span of input power levels the detector can measure linearly in dB; the AD8306 offers a wider range. |
| Logarithmic Slope | 25 mV/dB | 20 mV/dB | Slope determines the output voltage change per dB of input; a different slope requires recalibration of downstream ADC scaling. |
| Logarithmic Intercept | -84 dBm (at 25 mV/dB) | -95 dBm (at 20 mV/dB) | Intercept defines the reference point of the log transfer function; differing intercepts shift the absolute power calibration. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 6.5 V | Supply range affects compatibility with the system rail; the AD8306 tolerates a higher maximum supply voltage. |
| Supply Current | 7.5 mA typical | 16 mA typical | Quiescent current impacts power budget; the AD8306 draws roughly twice the current of the AD8307. |
| Limiting Amplifier Output | Not available | Available (differential limiting output) | The AD8306 provides a hard-limited output for phase/frequency demodulation, a function the AD8307 lacks entirely. |
| Package | 8-Lead SOIC (R-8) | 16-Lead SOIC (R-16) | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8307ARZ | AD8306ARZ-RL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Type | Logarithmic Amplifier | Limiting-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 AD8307ARZ and the AD8306ARZ-RL7?
The AD8307ARZ is a DC-to-500 MHz, 90 dB logarithmic amplifier (log amp) designed for RSSI and signal strength measurement, providing a nominal 25 mV/dB slope. The AD8306ARZ-RL7 is a 5 MHz-to-400 MHz, 100 dB limiting logarithmic amplifier with an integrated RSSI output and a high-speed limiter output, offering a nominal 20 mV/dB slope. The AD8306 includes a limiter output stage for phase/frequency demodulation, whereas the AD8307 provides only the logarithmic (RSSI) output.
Are the AD8307ARZ and AD8306ARZ-RL7 pin-compatible and directly interchangeable?
No. Both devices are supplied in a 16-lead SOIC package (R-16 suffix), but their pin functions and internal architectures differ. The AD8306 provides a limiter output and additional differential inputs/outputs not present on the AD8307. A direct drop-in substitution is not supported; the PCB layout and external component network must be redesigned per each device's datasheet.
What are the specified operating frequency ranges for each device?
The AD8307ARZ is specified for operation from DC to 500 MHz. The AD8306ARZ-RL7 is specified for operation from 5 MHz to 400 MHz. Designs requiring operation below 5 MHz should use the AD8307, while applications requiring the limiter output should use the AD8306 within its specified band.
How do the logarithmic slope and dynamic range of the two parts compare?
The AD8307ARZ provides approximately 90 dB of dynamic range with a nominal logarithmic slope of 25 mV/dB. The AD8306ARZ-RL7 provides approximately 100 dB of dynamic range with a nominal slope of 20 mV/dB. These values are specified in the respective manufacturer datasheets and affect the ADC scaling and calibration in the receiving system.
Does the AD8306ARZ-RL7 offer a limiter output that the AD8307ARZ lacks?
Yes. The AD8306ARZ-RL7 integrates a limiting amplifier with a differential limiter output intended for FM demodulation, phase detection, and frequency discrimination. The AD8307ARZ provides only a logarithmic (RSSI) voltage output and does not include a limiter output stage.
What are the package and ordering differences between AD8307ARZ and AD8306ARZ-RL7?
Both parts are offered in a 16-lead SOIC package. The AD8307ARZ suffix "Z" denotes RoHS-compliant packaging in tube or tray quantities. The AD8306ARZ-RL7 suffix "RL7" denotes RoHS-compliant tape-and-reel packaging in 7-inch reels. The electrical differences remain as specified in each datasheet regardless of packaging.
Which device is better suited for RSSI measurement in a narrowband receiver below 5 MHz?
The AD8307ARZ is the appropriate choice because its specified operating range extends from DC to 500 MHz, covering frequencies below 5 MHz. The AD8306ARZ-RL7 is specified only from 5 MHz to 400 MHz, so its use below 5 MHz is outside the verified datasheet range.
Can the AD8306ARZ-RL7 be used for FM demodulation while the AD8307ARZ cannot?
Yes. The AD8306ARZ-RL7 includes a limiter output that, when combined with an external quadrature detector or phase comparator, supports FM demodulation and phase/frequency discrimination. The AD8307ARZ provides only a logarithmic RSSI output and does not include the limiter stage required for these demodulation functions.