Overview
The AD8304ARUZ-RL7, produced by Analog Devices Inc., is a monolithic logarithmic detector optimized for the measurement of low frequency signal power in fiber optic systems. It utilizes an advanced translinear technique to provide an exceptionally large dynamic range in a versatile and easily used form. The device is designed to operate with a single positive supply voltage of 3.0 V to 5.5 V, although certain applications may benefit from the use of a negative supply as well. The AD8304 is known for its wide measurement range and high accuracy, achieved through proprietary design techniques and precise laser trimming.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VP) | 3.0 | 5.5 | V | ||
| Quiescent Current | Enabled | ~4.5 | mA | ||
| Logarithmic Slope | 10 mV/dB (200 mV/decade) | ||||
| Output Bandwidth | 10 MHz | ||||
| Slew Rate | 15 V/µs | ||||
| Operating Temperature | -40°C | +85°C | |||
| Package Type | 14-Lead TSSOP |
Key Features
- Optimized for fiber optic photodiode interfacing
- Eight full decades of range (100 pA – 10 mA)
- Single-supply operation (3.0 V – 5.5 V)
- Complete and temperature stable
- 1-, 2-, or 3-pole low-pass filtering at output
- Miniature 14-lead TSSOP package
- Accurate laser-trimmed scaling: logarithmic slope of 10 mV/dB (at VLOG pin)
- Basic logarithmic intercept at 100 pA
- Easy adjustment of slope and intercept
Applications
The AD8304ARUZ-RL7 is primarily used in fiber optic systems for the measurement of low frequency signal power. It is also suitable for various applications requiring precise logarithmic conversion, such as:
- Fiber optic communication systems
- Optical power monitoring
- Alarm and threshold detection systems
- Battery-operated devices due to its low quiescent current
Q & A
- What is the primary application of the AD8304ARUZ-RL7?
The AD8304ARUZ-RL7 is primarily used for the measurement of low frequency signal power in fiber optic systems.
- What is the supply voltage range for the AD8304ARUZ-RL7?
The device operates with a single positive supply voltage of 3.0 V to 5.5 V.
- What is the logarithmic slope of the AD8304ARUZ-RL7?
The logarithmic slope is accurately scaled to 10 mV/dB (200 mV/decade) at the VLOG pin.
- What is the output bandwidth of the AD8304ARUZ-RL7?
The output bandwidth is up to 10 MHz.
- What is the operating temperature range of the AD8304ARUZ-RL7?
The device is specified for operation from -40°C to +85°C.
- What package type is the AD8304ARUZ-RL7 available in?
The device is available in a 14-lead TSSOP package.
- Can the AD8304ARUZ-RL7 be used in battery-operated applications?
Yes, due to its low quiescent current, it is suitable for battery-operated applications.
- How can the logarithmic slope be adjusted?
The slope can be adjusted by shunting the VLOG output with an external resistance or by using the buffer and external feedback resistors.
- What is the purpose of the VREF pin on the AD8304ARUZ-RL7?
The VREF pin provides an accurate voltage reference of 2 V to facilitate the repositioning of the intercept.
- Can the AD8304ARUZ-RL7 be used as a comparator?
Yes, the buffer can serve as a comparator, with or without hysteresis, using the 2 V reference.
