DS3922
NOT RECOMMENDED FOR NEW DESIGNSHigh-Speed Current Mirror and Integrated FETs for DC-DC Controller
Single-Chip Burst-Mode RSSI Solution Integrates APD Bias, Current Mirror, and DC-DC FETs
- Part Models
- 2
- 1ku List Price
- Starting From $2.82
Part Details
- Accurate Burst-Mode RSSI Measurement with Two Current Mirror Outputs Improves Dynamic Range
- -32dBm to -5dBm Optical Input Range
- ±0.5dB Accuracy
- Sampling Period as Short as 300ns
- Pin Discharge Option
- Low-Noise APD Bias with Shutdown Options Reduces Receiver Sensitivity
- 15V to 76V APD Bias
- External Capacitor Connection for Controlled RC Time Constant of APD Voltage Filter
- Current Clamp with Adjustable Limit and External Shutdown with Limit Status
- High-Voltage Switch FET for APD Fast Shutdown
- Supports Additional DC-DC Functions
- Low-Voltage Synchronous Buck FETs for Efficient DFB Bias
- Low-Voltage pMOSFET for Generating Negative Bias Voltage for EMLs
- Small Package Reduces Total Solution Size and Cost
- 3.5mm x 3.5mm, 24-Pin TQFN Package with Exposed Pad
The DS3922 high-speed current mirror integrates high-voltage devices necessary for monitoring the burst mode receive power signal in avalanche photodiode (APD) biasing and OLT applications. The device has two small and one large gain current mirror outputs to monitor the APD current. An adjustable current clamp limits current through the APD. The clamp also features an external shutdown. An integrated FET is also provided that can be used to quickly clamp the high-voltage bias to ground in the case of high optical input power. Integrated low-voltage FET circuits can be used to create buck, boost, and inverting DC-DC converters for efficient laser bias and EML bias applications.
The DS3922 is available in a 24-pin TQFN package and operates over an extended -40°C to +95°C temperature range.
Applications
- 10G EPON
- 10GPON OLT
- Avalanche Photodiode (APD) Monitoring
- EML Bias
- GPON OLT
Documentation
Data Sheet 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS3922T+ | 24-LFCSP-3.5X3.5X0.75 | ||
| DS3922T+T | 24-LFCSP-3.5X3.5X0.75 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 17, 2018 - 1722C ASSEMBLY |
||
| DS3922T+ | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareLatest Discussions
No discussions on DS3922 yet. Have something to say?
Start a Discussion on EngineerZone®