NJW4710 JRC, NJW4710 Datasheet - Page 7

• Manufacturer Part Number: NJW4710
• Description: Vopr1 5V /Vopr2 9V / SSOP24-E1
• Manufacturer: JRC

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power supply voltage of Vcc2 above the following.
APPLICATION
Recommended operating voltage of NJW4710 is Vcc=5V,Vcc=9V.
Vcc2=9V is set up in consideration of the forward voltage [VF] (6V max.) of a Blue Laser Diode.
Therefore, in the case of a Red Laser Diode or Blue Laser Diode with low forward voltage, please set up the
Current gains of each channels of all are 120mA/mA typ.
Set up of the output current value in current input and voltage input is below.
In the case of current input
In the case of current input
NJW4710 contained in the oscillator for the light power change reduction by the return light noise of laser.
The quality of reading improves by operating oscillator and output it.
In this oscillator, oscillation frequency can be set up by connect resistance with a Rfreq(5pin) between GND.
Moreover, set up of the amount of oscillation superposition can be performed by connect resistance with a
Ramp(18pin) between GND.
Oscillation frequency is 150MHz to 600MHz. It can adjust to 10mApp to 100mApp (Refer to TYPCAL
CHARACTERISTICS) in the amount of high frequency superposition.
Output of this oscillator is PUSH-PULL circuit. Therefore, the output of the oscillator for high frequency
superposition is overlapped focusing on the output current value set up in the constant current output circuit.
Set up for operating voltage
Set up for output current
Set up for internal Oscillator
Ver.2
Please input current to IC. Output current is the following.
Output current is the following.
Output current can be set up by Rex=0ohm.
However, to reduce input noise,
please add a capacitor between Rex and GND.
(Refer to TEST CIRCUIT).
Rin(input resistance of IC) is CH-R:2.5kohm,CH-2/3/4:500ohm.
Operating voltage of Vcc2 = forward voltage(MAX) of laser diode + 3V
Iout=120*Iin [mA]
Iout=120*Vin/(Rex+Rin) [mA]
Iin
Vin
Fig.2 In the case of current input
Fig.3 In the case of voltage input
Rex
Rex
Iin
NJW4710
Rin
Rin
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