Part A
AD8306AR
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7304 個数
- Package
- SOIC-16
- Series
- リニアアンプ - 特殊用途
Replacement verdict
Not a drop-in replacement
The AD8307ARZ-RL7 and AD8306AR are not drop-in replacements for one another. Although both are logarithmic/RSSI detectors from Analog Devices, they differ fundamentally in signal path architecture, dynamic range, output interface, and package footprint, so substituting one for the other requires circuit redesign and full validation.
Different output type
Different dynamic range
Different package footprint
Different frequency range
Parts at a glance
Part B
AD8307ARZ-RL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2524 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 特殊用途
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-RL7 | AD8306AR | Why it matters |
|---|---|---|---|
| Function | Logarithmic amplifier / RSSI detector | Limiting amplifier with RSSI | Determines the core signal-processing role; a log amp detector and a limiting amplifier with RSSI are not directly interchangeable in a signal chain. |
| Frequency Range | DC to 500 MHz | 5 MHz to 400 MHz | Defines the operating bandwidth; the AD8307 extends to DC while the AD8306 has a lower frequency limit and narrower upper range. |
| Dynamic Range | 92 dB | 100 dB | Sets the span of input signal levels the device can measure; a wider dynamic range allows detection of weaker and stronger signals. |
| Output Type | Logarithmic voltage output | Logarithmic voltage output plus limiter output | Affects downstream interface design; the AD8306 provides an additional limited signal output for phase/frequency detection. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both support the same supply range, easing power-rail compatibility in a shared design. |
| Supply Current | 7.5 mA typical | 16 mA typical | Impacts power budget and thermal design; the AD8306 draws roughly twice the current of the AD8307. |
| Package | 8-lead SOIC | 16-lead SOIC | Determines PCB footprint and pin count; the two parts are not drop-in compatible due to different package sizes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental suitability is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8306AR | AD8307ARZ-RL7 |
|---|---|---|
| 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 AD8307ARZ-RL7 and the AD8306AR?
The AD8307ARZ-RL7 is a 500 MHz, 92 dB logarithmic amplifier (log amp) designed for RSSI and signal strength measurement, providing a DC output proportional to the log of the input voltage. The AD8306AR is a 400 MHz, 100 dB limiting logarithmic amplifier with a built-in limiter output and RSSI, intended for received signal strength indication and phase detection in FM/PM receivers. The AD8306AR includes a hard-limited output stage, while the AD8307ARZ-RL7 does not.
Are the AD8307ARZ-RL7 and AD8306AR pin-compatible?
No. The AD8307ARZ-RL7 is supplied in an 8-lead SOIC package (SOIC-8), while the AD8306AR is supplied in a 16-lead SOIC package (SOIC-16). The two devices have different pin counts and pin functions, so they are not pin-compatible and cannot be dropped into the same PCB footprint.
What is the specified operating frequency range for each device?
The AD8307ARZ-RL7 is specified for operation from DC to 500 MHz. The AD8306AR is specified for operation from DC to 400 MHz. Both are fabricated on Analog Devices' proprietary X-AMP architecture, but the AD8306AR's limiter and RSSI specifications are characterized up to 400 MHz.
How do the logarithmic dynamic ranges of the AD8307ARZ-RL7 and AD8306AR compare?
The AD8307ARZ-RL7 provides a nominal 92 dB dynamic range with a logarithmic slope of 25 mV/dB and an intercept of approximately -84 dBm (referenced to 50 Ω). The AD8306AR provides a nominal 100 dB dynamic range with a logarithmic slope of 20 mV/dB. The AD8306AR's wider dynamic range is achieved partly through its limiting amplifier stages.
Does the AD8306AR provide a limiter output that the AD8307ARZ-RL7 lacks?
Yes. The AD8306AR includes a hard-limiting output (LIM) that provides a constant-amplitude signal for phase/frequency demodulation, in addition to the RSSI output. The AD8307ARZ-RL7 provides only a logarithmic (RSSI) voltage output and does not include a limiter output stage.
What are the supply voltage and current consumption specifications for these devices?
Both devices operate from a single supply. The AD8307ARZ-RL7 operates from 2.7 V to 5.5 V and typically draws about 7.5 mA. The AD8306AR operates from 2.7 V to 5.5 V and typically draws about 16 mA, reflecting its additional limiting amplifier circuitry. Designers should verify exact quiescent current from the respective datasheets for their operating conditions.
Can the AD8307ARZ-RL7 be used as a direct replacement for the AD8306AR in an existing design?
No. Beyond the package and pin-count differences (SOIC-8 vs SOIC-16), the AD8306AR provides a limiter output and a different logarithmic slope (20 mV/dB vs 25 mV/dB) and dynamic range (100 dB vs 92 dB). A direct replacement would require PCB redesign and recalibration of the RSSI transfer function, and the limiter function would be lost.
What are the typical applications for each device?
The AD8307ARZ-RL7 is typically used for RSSI measurement, signal strength indication, and logarithmic conversion in receivers and test equipment up to 500 MHz. The AD8306AR is typically used in FM/PM receivers, where its limiter output supports demodulation, and for RSSI in applications requiring up to 100 dB of dynamic range up to 400 MHz.