Overview
The AD8307AR-REEL, produced by Analog Devices Inc., is a monolithic demodulating logarithmic amplifier designed for a wide range of applications. It is available in an 8-lead SOIC package and operates on a single supply voltage of 2.7 V to 5.5 V, drawing a typical current of 7.5 mA. This device is notable for its high dynamic range of 92 dB and its ability to convert signal levels to decibel form with high accuracy and stability.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Range (±3 dB Error) | - | - | 92 dB | - |
| Input Range (±1 dB Error) | - | - | 88 dB | - |
| Logarithmic Conformance (f ≤ 100 MHz) | ±0.3 dB | ±1 dB | - | - |
| Logarithmic Slope | 23 mV/dB | 25 mV/dB | 27 mV/dB | - |
| Logarithmic Intercept | -87 dBm | -84 dBm | -77 dBm | - |
| Supply Voltage | 2.7 V | - | 5.5 V | - |
| Supply Current | 7.5 mA | - | 10 mA | - |
| Standby Current | 150 μA | - | 750 μA | - |
| Operating Temperature Range | -40°C | - | +85°C | - |
| Upper Usable Frequency | - | - | 500 MHz | - |
| Lower Usable Frequency | 10 Hz | - | - | - |
Key Features
- Complete multistage logarithmic amplifier with a dynamic range of 92 dB.
- Single supply operation from 2.7 V to 5.5 V at 7.5 mA typical current.
- Highly stable scaling over temperature.
- Fully differential dc-coupled signal path.
- Fast power-up time of 100 ns and low standby current of 150 μA.
- CMOS-compatible control pin for enabling/disabling the device.
- Adjustable logarithmic slope and intercept.
- Internal offset correction loop for minimizing input offset voltage.
Applications
- Conversion of signal level to decibel form.
- Transmitter antenna power measurement.
- Receiver signal strength indication (RSSI).
- Low-cost radar and sonar signal processing.
- Network and spectrum analyzers.
- Signal level determination down to 20 Hz.
- True decibel ac mode for multimeters.
Q & A
- What is the dynamic range of the AD8307?
The AD8307 has a dynamic range of 92 dB (±3 dB error) and 88 dB (±1 dB error) up to 100 MHz.
- What is the supply voltage range for the AD8307?
The AD8307 operates on a single supply voltage from 2.7 V to 5.5 V.
- What is the typical supply current of the AD8307?
The typical supply current is 7.5 mA.
- How does the AD8307 perform in terms of temperature stability?
The AD8307 is highly stable over temperature, operating from -40°C to +85°C.
- What is the upper usable frequency of the AD8307?
The upper usable frequency is 500 MHz.
- Can the logarithmic slope and intercept of the AD8307 be adjusted?
- What is the standby current of the AD8307 when disabled?
The standby current is 150 μA when the device is disabled.
- What are some common applications of the AD8307?
- What package types are available for the AD8307?
The AD8307 is available in 8-lead SOIC and 8-lead PDIP packages.
- How fast is the power-up time of the AD8307?
The power-up time is 100 ns.
