SP8126B
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Manufacturer Part#:

SP8126B

Product Category: IC Chips
Manufacturer: SIPEX
Description:
  datasheetSP8126B Datasheet
Package: COB
Quantity: 10560 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: SIPEX
Product Category: IC Chips
Features, Applications

FEATURES Dual Wavelength Slew Rate of 300V/μs Fast Settling Time - 7ns Gain Control 2V Output Swing Low Offset Voltage: < 10mV Low Offset Drift: 20μV/°C 12dB External Gain Adjust Range


DESCRIPTION The is a high-speed, differential output APC amplifier that integrates the photodiode and adjustable gain block on one chip. Independent gain control allows individual adjustment for 780mn and 650nm wavelength operation, as found in CD/DVD optical storage drives. This allows the user to control the laser power of the system in high-speed DVDRW, DVDRAM and CDRW systems. The wide 2V output swing also allows better system performance, through improved dynamic range.


Rev:B Date: 3/18/04 SP8126B High Speed Differential APC Amplifier c Copyright 2004 Sipex Corporation


TJ(MAX)........................................................................................ 120°C VS(MAX)............................................................................................... 6V VIN(MAX).............................................................................................. 6V Power Supply Voltage Continuous Power Dissipation (TAMB = 70°C) COB (derate 13.3mW/°C above +70°C)......... 90mW These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.


Unless otherwise noted: VCC = 5.0V, CLOAD 50pF to GND, RLOADP = RLOADN 1k to GND, RGAIN = 510 (Nominal Gain), TA +85°C, Output measured differentially.


PARAMETER Supply Voltage Output Sensitivity Output Sensitivity vs. Temp Output Sensitivity vs. Vcc Input Optical Power Required to Produce 2V Output Swing Full Scale Linear Output Voltage Swing Output Common Mode Voltage


Unless otherwise noted: VCC = 5.0V, CLOAD 50pF to GND, RLOADP = RLOADN 1k to GND, RGAIN = 510 (Nominal Gain), TA +85°C, Output measured differentially.


PARAMETER Output Settling Time (1% of Final Value) Output Slew Rate Output Overshoot Power Supply Current


CONDITIONS 2VPP Step 2VPP Step, RGAIN = 1230 (High Gain)

< +85°C Gain Adjust Range Gain Select Input Voltage VIL (TTL Level) Gain Select Input Voltage VIH (TTL Level) 225 < RGAIN 1230 -6


PIN NUMBER NAME VCC GAIN RGCOM GND RGAIN1 RGAIN2 VOUTVOUT+ FUNCTION Supply Voltage Gain Select Common connection point for RGAIN1 and RGAIN2 Power Ground Gain Adjust 1 (Gain Select = LOW) or OPEN Gain Adjust 2 (Gain Select = HIGH) Output Voltage Output Voltage +


THEORY OF OPERATION Internal Operation The SP8126B APC circuit has an integrated photo detector and is designed with nominal sensitivities of 3mV/μW for both 650nm and 780nm wavelength laser light. The part's sensitivity can also be adjusted continuously and independently for two different gain modes via two external resistors over a range of ±6dB. The two gain modes are controlled by a TTL compatible logic input, called GAIN SELECT. This logic pin selects between the two external gain setting resistors to allow independent control and settings for the two gain functions. The system is a two stage design, consisting of a Trans-Impedance Amplifier (TIA) and an output buffer stage. In dark condition the outputs VOUT- and VOUT+ are set to a reference voltage


that is defined internally as Vcc/2. With or 780nm wavelength laser light falling on the photodetector, the output will swing differentially around Vcc/2 proportional with the light power according to the chosen gain. TIA and Gain control The first stage is a differential TIA used to convert the photodetector current to a balanced differential voltage. The traditional fixed feedback resistors have been replaced with an active resistor circuit that sets the trans-impedance value. A Resistor Control Block that senses the value of the external gain setting resistor controls the value of the equivalent feedback resistor.

Search Part number : "SP812" Included word is 8
Part Number Manufacturer Package Quantity Description
SP8126CB/TR SIPEX COB 22212
SP8126CB-2/TR SIPEX COB 20880
SP8126CB-2-MS1293 SPIEX COB 63360
SP8126CB-3 SIPEX COB 10705
SP8126CB-3/TR SIPEX DFN 16857
SP8126CB-MS1293 SIPEX COB 43300
SP8127DG SIPEX OPLGA-8 4860
SP8127NDG/TR SIPEX QFN33.5 20845
SP8126B RELATED PRODUCT PICTURE
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