Overview
The AD8304ARU-REEL7 is a monolithic logarithmic detector produced by Analog Devices Inc. This component is optimized for the measurement of low-frequency signal power, particularly in fiber-optic supervisory systems. It utilizes an advanced translinear technique to provide an exceptionally large dynamic range of 160 dB (from 100 pA to 10 mA) in a versatile and easily used form. The AD8304 operates with a single positive supply voltage of 5 V, but it can also function with supply voltages ranging from 3.0 V to 5.5 V, and optionally with a negative supply voltage for certain applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Current Range | 100 pA | 10 mA | |||
| Peak Error (1 nA < IPD < 1 mA) | VP = 5 V, VN = 0 V, TA = 25°C | 0.1 dB | 0.25 dB | 0.7 dB | dB |
| Maximum Output Voltage | 1.6 V | V | |||
| Minimum Output Voltage | VN = 0 V | 0.1 V | V | ||
| Output Resistance | Laser-trimmed at 25°C | 4.95 kΩ | 5 kΩ | 5.05 kΩ | kΩ |
| Reference Output Voltage | Laser-trimmed at 25°C | 1.98 V | 2 V | 2.02 V | V |
| Operating Temperature Range | –40°C | +85°C | °C | ||
| Package Type | 14-Lead TSSOP |
Key Features
- Exceptionally large dynamic range of 160 dB (100 pA to 10 mA) using advanced translinear technique.
- Operates with a single positive supply voltage (3.0 V to 5.5 V) and optionally with a negative supply voltage.
- Low quiescent current of approximately 4 mA.
- Output bandwidth of up to 10 MHz and a slew rate of 15 V/µs.
- Supports 1, 2, or 3-pole low-pass filtering at the output.
- Versatile detector for APC loops and high-accuracy optical power measurement.
- Easy adjustment of slope and intercept to fit various application requirements.
Applications
- High-accuracy optical power measurement in fiber-optic systems.
- Wide-range baseband log-compression.
- Automated power control (APC) loops.
- Fiber-optic supervisory systems.
Q & A
- What is the dynamic range of the AD8304?
The AD8304 has a dynamic range of 160 dB, from 100 pA to 10 mA. - What is the typical operating supply voltage for the AD8304?
The typical operating supply voltage is 5 V, but it can range from 3.0 V to 5.5 V. - Can the AD8304 operate with a negative supply voltage?
Yes, the AD8304 can operate with an optional negative supply voltage, VN, up to a maximum of 8 V between VPOS and VNEG. - What is the output resistance of the AD8304?
The output resistance is laser-trimmed to 5 kΩ at 25°C, with a range of 4.95 kΩ to 5.05 kΩ. - What is the reference output voltage of the AD8304?
The reference output voltage is 2 V, with a range of 1.98 V to 2.02 V at 25°C. - What is the operating temperature range of the AD8304?
The operating temperature range is from –40°C to +85°C. - What package type is the AD8304 available in?
The AD8304 is available in a 14-lead TSSOP package. - What are some common applications of the AD8304?
Common applications include high-accuracy optical power measurement, wide-range baseband log-compression, and automated power control (APC) loops in fiber-optic systems. - How can the slope and intercept of the AD8304 be adjusted?
The slope and intercept can be adjusted by adding a shunt resistor between the VLOG pin and ground, allowing for optimal positioning of the output voltage range. - What is the quiescent current of the AD8304?
The quiescent current is approximately 4 mA when enabled.
