Overview
The AD8307ANZ, produced by Analog Devices Inc., is a low-cost, monolithic demodulating logarithmic amplifier. It is the first logarithmic amplifier available in an 8-lead SOIC package and is designed for a wide range of applications requiring signal level conversion to decibel form. The AD8307 operates from a single-supply voltage of 2.7 V to 5.5 V, consuming 7.5 mA of current, and can be disabled to a standby current of under 150 μA using a CMOS-compatible control pin. It is highly stable and easy to use, requiring no significant external components.
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 | VENB ≥ 2 V | 8 mA | - | 10 mA | - |
| Standby Current | VENB ≤ 1 V | 150 μA | - | 750 μA | - |
| Operating Temperature Range | - | -40°C | - | +85°C | - |
| Package Types | - | - | - | 8-lead SOIC, 8-lead PDIP | - |
Key Features
- Complete 500 MHz monolithic demodulating logarithmic amplifier based on the progressive compression technique.
- 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.
- Single-supply voltage of 2.7 V to 5.5 V at 7.5 mA, with a standby current of under 150 μA.
- CMOS-compatible control pin for enabling/disabling the device.
- Highly stable and easy to use, requiring no significant external components.
- Operates over the industrial temperature range of –40°C to +85°C.
- Available in 8-lead SOIC and PDIP packages.
- Logarithmic output voltage scaled at 25 mV/dB, adjustable via external components.
- Excellent supply insensitivity and temperature stability of the scaling parameters.
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 (up to 120 dB).
- Signal level determination down to 20 Hz.
- True decibel ac mode for multimeters.
Q & A
- What is the dynamic range of the AD8307ANZ?
The AD8307ANZ has 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.
- What is the supply voltage range for the AD8307ANZ?
The supply voltage range is from 2.7 V to 5.5 V.
- What is the standby current of the AD8307ANZ?
The standby current is under 150 μA when the device is disabled.
- What are the package types available for the AD8307ANZ?
The AD8307ANZ is available in 8-lead SOIC and 8-lead PDIP packages.
- What is the operating temperature range of the AD8307ANZ?
The operating temperature range is from –40°C to +85°C.
- How does the AD8307ANZ achieve its logarithmic function?
The AD8307ANZ uses a cascade of nonlinear amplifier cells (progressive compression technique) to generate the logarithmic function.
- Can the AD8307ANZ be used at low frequencies?
Yes, the AD8307ANZ can be used at audio frequencies (20 Hz) or even lower.
- How is the logarithmic output voltage scaled?
The logarithmic output voltage is scaled at 25 mV/dB and can be adjusted using external components.
- What are some common applications of the AD8307ANZ?
Common applications include signal level conversion, transmitter antenna power measurement, RSSI, low-cost radar and sonar signal processing, and network and spectrum analyzers.
- Is the AD8307ANZ easy to use?
Yes, the AD8307ANZ is highly stable and easy to use, requiring no significant external components.
