AK2557 Overview
The AK2557 is a 4-channel cathode mon LDD (Laser Diode Driver) suitable for MFPs (Multi Function Printer) and LBPs (Laser Beam Printer). The AK2557 equips a 200MHz [Max.] LDD that switches the LD current, current-DACs that set the operation current of LD and a feed-back digital APC (Auto Power Control) circuit that maintains the optical LD power constant. The AK2557 can improve the printing quality and reduces...
AK2557 Key Features
- 4ch Cathode mon LDD Switching LD Current at 200MHz [Max]
- 9-bit Current-DAC for “Ibias”: Maximum Output Current = 45mA [Typ.]
- 9-bit Current-DAC for “Isw” with AGC (Auto Gain Control): Maximum Output Current = 90mA [Typ.]
- Feed-Back Digital APC (APC_FB) and Internal APC Adjustment Circuit with Digital Interface
- Monitor PD Current Input for 4 Beams LD and Multi-Beams LD (by Cascade Connection)
- LD Power Attenuation and Shading Correction
- Excessive Over-Current Alarm
- Start-Up Operation (Loading External EEPROM Data and Executing Initial APC)
- Power Supply: 5V±5% Single Power