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ONET4201LDRGERG4 Datasheet(PDF) 7 Page - Texas Instruments |
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ONET4201LDRGERG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 26 page www.ti.com P0024-03 GND VCC MOD– MOD+ VCC BIAS 18 17 16 15 14 13 1 2 3 4 5 6 GND VCC DIN+ DIN– VCC GND 24 23 22 21 20 19 7 8 9 10 11 12 RGE PACKAGE (TOP VIEW) ONET4201LD SLLS677 – NOVEMBER 2005 Figure 3. Pinout of the ONET4201LD in a 4-mm × 4-mm, 24-Lead QFN Package (Top View) TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. APCSET 23 Analog-in Set photodiode reference current with resistor to GND. BIAS 13 Analog-out Laser diode bias current sink. Connect to laser cathode. CAPC 20 Analog APC loop capacitor DIN+ 3 CML-in Noninverted data input. On-chip, 50- Ω terminated to VCC. DIN– 4 CML-in Inverted data input. On-chip, 50- Ω terminated to VCC. DISABLE 24 LVTTL-in Disable modulation and bias current outputs. FLTMODE 10 CMOS-in Fault mode selection input. If a low level is applied to this pin, any fault event is latched and the bias and modulation currents are disabled in a fault condition. Toggling of DISABLE or VCC resets the fault condition. If pin is set to a high level, fault events are flagged at the SDOWN output but not latched. The bias and modulation currents are not disabled. SDOWN is reset once the fault condition disappears. GND 1, 6, 18, EP Supply Circuit ground. The exposed die pad (EP) must be grounded. IBMAX 21 Analog-in Set maximum laser diode current with resistor to GND. MOD+ 15 Analog-out Laser modulation current output. Connect to laser cathode. Avoid usage of vias on board. MOD– 16 Analog-out Complementary laser modulation current output. Connect to VCC adjacent to anode of laser diode. Avoid usage of vias on board. MODSET 11 Analog-in Set temperature-independent modulation current with resistor to GND. MODTC 12 Analog-in Set modulation-current temperature compensation with resistor to GND. MONB 8 Analog-out Bias current monitor sources 1/68 of the bias current MONP 7 Analog-out Photodiode current monitor sources a current identical to the photodiode current OUTPOL 22 LVTTL-in Alters modulation current output polarity. Open or high: normal polarity, low: inverted polarity. OUTPOL is pulled up internally. Normal polarity: when DIN+ is high, current is sunk into MOD+. PD 19 Analog-in Monitor photodiode input. Connect to photodiode anode for APC. Sinks the photodiode current to GND. SDOWN 9 LVTTL-out Fault detection flag VCC 2, 5, 14, 17 Supply 3.3 V ±10% supply voltage 7 Submit Documentation Feedback |
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