Overview
The ADL5315ACPZ-R7, produced by Analog Devices Inc., is a precision high-side current mirror designed for a wide input current range. It features a stable and user-adjustable input voltage, making it highly versatile for various applications. The device is optimized for use with PIN photodiodes but is also suitable for a broad array of other applications due to its flexibility and wide operating range. It provides a compact solution for interfacing optical power monitoring devices to the cathode-side of a PIN photodiode, mirroring the current at a 1:1 ratio over six decades of input current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Current Range | 3 nA to 3 mA | A |
| Linearity | 1% from 3 nA to 3 mA | % |
| Supply Voltage Range | 2.7 V to 8 V | V |
| Operating Temperature Range | −40°C to +85°C | °C |
| Package Type | 8-Lead LFCSP (2 mm × 3 mm) | |
| Quiescent Current (IINPT = 3 µA) | 1.8 to 2.2 mA | mA |
| Quiescent Current (IINPT = 3 mA) | 8.3 to 10.2 mA | mA |
| Internal Power Dissipation | 500 mW | mW |
| Maximum Junction Temperature | 125°C | °C |
Key Features
- Accurately mirrors input current over six decades with a 1:1 ratio, enabling monitoring at low signal levels.
- Stable mirror input voltage, held 1 V below supply using an internal reference or set externally.
- Adjustable input current limit provides protection to the connected photodiode.
- Low noise production, suitable for sensitive applications.
- Miniature 8-lead LFCSP package (2 mm × 3 mm) for space-saving designs.
- Operates over a wide temperature range from −40°C to +85°C.
- Voltage-to-current conversion with minimal loading and dark current in photodiode applications.
Applications
- Optical power monitoring from a single photodiode.
- General voltage biasing with precision current monitoring.
- Voltage-to-current conversion.
- Interfacing with translinear logarithmic amplifiers for high accuracy PIN power monitoring.
- Power monitoring in systems where access is limited to the cathode of a PIN photodiode or receiver module.
Q & A
- What is the input current range of the ADL5315?
The ADL5315 has an input current range of 3 nA to 3 mA.
- What is the linearity of the ADL5315 over its input current range?
The linearity is 1% from 3 nA to 3 mA.
- What is the supply voltage range for the ADL5315?
The supply voltage range is from 2.7 V to 8 V.
- What package type is the ADL5315 available in?
The ADL5315 is available in an 8-lead LFCSP package (2 mm × 3 mm).
- How does the ADL5315 protect the connected photodiode?
The ADL5315 provides adjustable input current limiting using an external resistor, protecting the connected photodiode.
- What is the operating temperature range of the ADL5315?
The operating temperature range is from −40°C to +85°C.
- Can the ADL5315 be used for voltage-to-current conversion?
- How does the ADL5315 interface with PIN photodiodes?
The ADL5315 sets the bias voltage on the PIN diode and mirrors the diode current to be measured by a translinear logarithmic amplifier.
- What are some common applications of the ADL5315?
Common applications include optical power monitoring, general voltage biasing with precision current monitoring, and voltage-to-current conversion.
- Is the ADL5315 suitable for high accuracy PIN power monitoring?
