Overview
The AD8307AN, produced by Analog Devices Inc., is a complete 500 MHz monolithic demodulating logarithmic amplifier. It is the first logarithmic amplifier available in an 8-lead SOIC_N package. This device employs the progressive compression (successive detection) technique, providing a dynamic range of 92 dB to ±3 dB law conformance and 88 dB to a tight ±1 dB error bound at all frequencies up to 100 MHz. The AD8307AN is highly stable, easy to use, and requires no significant external components. It operates on a single-supply voltage of 2.7 V to 5.5 V and consumes 7.5 mA of current, making it a low-power solution. The device also features a fast-acting CMOS-compatible control pin that can disable it to a standby current of under 150 µA.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Range (±3 dB Error) | From noise floor to maximum input | - | - | 92 dB | - |
| Input Range (±1 dB Error) | From noise floor to maximum input | - | - | 88 dB | - |
| Logarithmic Conformance | f ≤ 100 MHz, central 80 dB | ±0.3 dB | ±1 dB | - | - |
| Logarithmic Slope | Unadjusted | 23 mV/dB | 25 mV/dB | 27 mV/dB | - |
| Supply Voltage | - | 2.7 V | - | 5.5 V | - |
| Supply Current | - | - | 7.5 mA | - | - |
| Operating Temperature | - | -40°C | - | +85°C | - |
| Package Type | - | - | - | 8-lead SOIC, 8-lead PDIP | - |
Key Features
- Complete 500 MHz monolithic demodulating logarithmic amplifier.
- Dynamic range of 92 dB to ±3 dB law conformance and 88 dB to a tight ±1 dB error bound up to 100 MHz.
- Single-supply voltage of 2.7 V to 5.5 V at 7.5 mA.
- Fast-acting CMOS-compatible control pin for standby mode (under 150 µA).
- High stability and ease of use with no significant external components required.
- Full differential input with moderately high impedance (1.1 kΩ in parallel with about 1.4 pF).
- Output voltage scaled at 25 mV/dB, generated by a current of nominally 2 µA/dB through an internal 12.5 kΩ resistor.
- Excellent supply insensitivity and temperature stability of the scaling parameters.
Applications
- Receiver Signal Strength Indication (RSSI) in wireless communication systems.
- Automatic Gain Control (AGC) circuits.
- Power measurement and detection in RF and microwave systems.
- Signal processing in radar and communication systems.
- Audio to UHF frequency range applications.
Q & A
- What is the dynamic range of the AD8307AN? The AD8307AN has a dynamic range of 92 dB to ±3 dB law conformance and 88 dB to a tight ±1 dB error bound up to 100 MHz.
- What is the supply voltage range for the AD8307AN? The AD8307AN operates on a single-supply voltage of 2.7 V to 5.5 V.
- What is the typical supply current of the AD8307AN? The typical supply current is 7.5 mA.
- How does the AD8307AN handle standby mode? The AD8307AN features a fast-acting CMOS-compatible control pin that can disable it to a standby current of under 150 µA.
- What is the logarithmic slope of the AD8307AN? The logarithmic slope is typically 25 mV/dB.
- What are the package options for the AD8307AN? The AD8307AN is available in 8-lead SOIC and 8-lead PDIP packages.
- What is the operating temperature range of the AD8307AN? The operating temperature range is from -40°C to +85°C.
- Can the AD8307AN be used at low frequencies? Yes, the AD8307AN can be used at audio frequencies (20 Hz) or even lower.
- How is the output voltage of the AD8307AN generated? The output voltage is generated by a current of nominally 2 µA/dB through an internal 12.5 kΩ resistor.
- What are some common applications of the AD8307AN? Common applications include RSSI in wireless communication systems, AGC circuits, power measurement and detection in RF and microwave systems, and signal processing in radar and communication systems.
