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ADN8820 Datasheet(PDF) 7 Page - Analog Devices |
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ADN8820 Datasheet(HTML) 7 Page - Analog Devices |
7 / 9 page ADN8820 Preliminary Technical Data Rev. PrB | Page 7 of 9 Name Pin Function Connections DITHER GENERATOR DSEL/SD 21 4-level logic input to set dither frequency or engage shutdown External voltage DCTL 36 Sets dither current as a percentage of the laser diode current Resistor (RDCTL) to ground DO 35 Optional dither AC current to laser diode To laser diode through 1 nF series capacitor LOGIC INPUTS MODE1 18 Sets control loop mode (see Table I) External logic voltage MODE0 19 Sets control loop mode (see Table I) External logic voltage DSEL/SD 21 Pulling voltage low engages shutdown External voltage SS/SB 25 Pulling voltage low engages standby 470 pF soft-start capacitor to ground; optional external FET can pull down to engage standby LOGIC OUTPUTS CLGD 20 Logic high if EAOUT is within 5% to 95% of AVDD; Logic low otherwise POWER PVDD 29, 34 Power for output amplifiers and digital sections 3.0 V to 5.5 V AVDD 43 Low noise power for TIAs, limiter section, and EA 3.0 V to 5.5 V PGND 32 Current return for output amplifiers 0 V AGND 14 Low noise ground 0 V VREF 13 2.5 V reference voltage Can be used as refernce for VB, VBLP, SET, and limiter inputs TABLE 4. MODE CONTROL LOGIC MODE Inputs Error Amplifier MUX MODE1 MODE0 Mode Setting -Input +Input Output Description 0 0 Constant Current EANLP SET LIO Maintains a fixed current through laser diode; generally used for calibration. 0 1 Constant Laser Power EANLP SET LPO Maintains a constant optical output power from laser diode. 1 0 Constant Ouptut Power EANOP SET OPO Maintains a constant optical power at output of EDFA. 1 1 Constant Gain EANOP IPO OPO Monitors both input and output optical power to maintain constant gain from optical amplifier. TABLE 5. PWM CLOCK FREQUENCY SELECTION LEVELS DSEL/SD (V) PWM Clock Frequency Min Max Mode Division 0 0.5 Shutdown N/A 0.7 1.2 Active fDITHER ÷2 1.3 1.8 Active fDITHER ÷4 2.0 VDD Active fDITHER ÷8 Note: fDITHER is the ADN8820 dither frequency and is set by a resistor connected from RT to ground. |
Número de pieza similar - ADN8820_15 |
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Descripción similar - ADN8820_15 |
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