Part A
AD8306AR
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7304 PCS
- Package
- SOIC-16
- Series
- Linear - Amplifiers - Special Purpose
Replacement verdict
Not a drop-in replacement
The AD8306AR and AD8307AR-REEL7 are both logarithmic amplifiers from Analog Devices, but they are not functionally interchangeable. The AD8306AR is a limiting logarithmic amplifier with RSSI and a high-speed parallel output interface intended for received-signal-strength indication, while the AD8307AR-REEL7 is a DC-coupled logarithmic amplifier providing a buffered voltage output proportional to input in dB. Their output types, dynamic range, bandwidth, and application roles differ substantially, so the AD8307AR-REEL7 cannot directly replace the AD8306AR without redesign of the surrounding signal chain.
Different output type
Different dynamic range
Different bandwidth
Different application role
Parts at a glance
Part B
AD8307AR-REEL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5045 PCS
- Package
- SOIC-8
- 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 | AD8306AR | AD8307AR-REEL7 | 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 | -100 dBV | -84 dBm | Reference point for the log transfer function; must be accounted for when converting output voltage to input power. |
| Supply Voltage | 2.7 V to 6.5 V | 2.7 V to 5.5 V | Determines compatibility with the system power rail; the AD8306 tolerates a slightly higher maximum supply. |
| Supply Current | 16 mA typical | 7.5 mA typical | Affects power budget and thermal considerations in the target design. |
| Package | 14-Lead SOIC | 8-Lead SOIC | Footprint and pin count differ, so the two parts are not drop-in PCB compatible. |
| Limiting Output | Yes (differential limiter output) | No | The AD8306 provides a limited output for FM/demodulation applications, which the AD8307 does not offer. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8306AR | AD8307AR-REEL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| 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 AD8307AR-REEL7?
The AD8306AR is a complete 100 MHz to 400 MHz limiting logarithmic amplifier (demodulating logarithmic amplifier) that provides a 90 dB dynamic range and an RSSI output, while the AD8307AR-REEL7 is a 500 MHz, 92 dB logarithmic amplifier (log amp) intended for signal strength measurement. The AD8306AR includes a limiter output and is optimized for received signal strength indication (RSSI) and phase detection in FM/PM receivers, whereas the AD8307AR-REEL7 provides a DC output proportional to the logarithm of the input signal's absolute value for power measurement applications.
Are the AD8306AR and AD8307AR-REEL7 pin-compatible?
No. The AD8306AR is supplied in a 16-lead SOIC package, and the AD8307AR-REEL7 is supplied in an 8-lead SOIC package. The pin counts and pin functions differ, so they are not drop-in replacements for each other and require different PCB footprints.
What is the specified operating frequency range for each device?
The AD8306AR is specified for operation from 100 MHz to 400 MHz. The AD8307AR-REEL7 is specified for operation from DC to 500 MHz.
How do the dynamic ranges of the AD8306AR and AD8307AR-REEL7 compare?
The AD8306AR provides a nominal 90 dB dynamic range. The AD8307AR-REEL7 provides a nominal 92 dB dynamic range. Both figures are based on the respective manufacturer datasheets.
What output signal types do these two log amplifiers provide?
The AD8306AR provides an RSSI (received signal strength indicator) output and a limiter output for demodulation. The AD8307AR-REEL7 provides a single logarithmic (dB) voltage output proportional to the input signal level, without a limiter output.
What are the package and ordering differences between AD8306AR and AD8307AR-REEL7?
The AD8306AR is offered in a 16-lead SOIC package. The AD8307AR-REEL7 is offered in an 8-lead SOIC package and is supplied on a 7-inch reel in tape-and-reel format, as indicated by the REEL7 suffix.
Can the AD8307AR-REEL7 be used as a direct substitute for the AD8306AR in an existing design?
No. Because the two devices differ in package pin count, pin functions, frequency range, and output configuration, a direct substitution is not possible without redesigning the PCB and validating the circuit against the target device's datasheet specifications.