AVAGO HFBR-2521Z Compatible 650nm optical fiber The DC-5 MBd high-performance optoelectronic transceiver device

product presentation
FT-1521Z / 2521Z series optical fiber transceiver devices, combined with 650nm plastic optical fiber, provide high performance and low cost optical fiber communication links for industrial, power generation, medical, transportation and game applications. FT-1521Z is driven by 60mA current with a minimum typical transmission distance of 80 meters.   

FT-1521Z / 2521Z is fully compatible with AVAGO’s HFBR-1521Z / 2521Z series products, supporting industrial standard plastic fiber interface, providing horizontal structure. FT-1521Z / 2521Z fits 1mm diameter plastic fibers and HCS fibers of 200 μ m diameter.

FT-1521Z is a transmitter and is packaged by a high-power LED chip with a peak wavelength of 650nm. The plastic fiber with 1mm core diameter can output a typical optical power value of-5 dBm under a 60mA current drive. FT-2521Z is a receiver composed of a high gain span resistance amplifier with integrated photodiode. The output stage is open leakage output and supports a maximum output voltage of 18V. To improve the stability of the output pulse width of the receiver, the receiver chip has designed the automatic artery width calibration circuit with the pulse width distortion within ± 20ns.

Product characteristics
● Data transfer rate: DC-5 MBd  
● Typical transmission distance: 80 meters   
● The output waveform and pulse width is stable  
● Meet the industrial grade temperature range: -40℃ to 85℃   
● Compliance with the RoHS criteria 

Product application
● Factory automation  
● Lan  
● Audio and video applications / game applications  
● Industrial network and fieldbus  

System connection index
Transceiver link photoelectric parameters

Parameter	Symbol	Min	Typical	Max	unit	Explain
signal rate	Sr	DC	5		MBd
transmission distance	L	43	80		m	IF=60mA
Output from low to high time delay	TPLH		47		ns	Fiber length is 0.1m， PR=-10dBm
Output from high to low	TPHL		42		ns	Fiber length is 0.1m， PR=-10dBm
Pulse width distortion	TP		-5		ns	Fiber length is 0.1m， PR=-10dBm
			-7		ns	PR= -24dBm

Figure 1. Transmission distance limit of POF fiber FT-1521Z / 2521Z with 1mm core diameter    

Figure 2 The pulse width distortion of FT-1521Z / 2521Z at the 5 MBd rate 
Typical application diagram 

Circuit diagram of the typical application of FT-1521Z / 2521Z

By adjusting the R1 resistance value, it can compromise between the power consumption and the transmission distance, as given below

If the maximum transmission distance is 65 meters, from FIG. 1, the driving current of FT-1521Z should be 30mA, and from FIG. 4, when the driving current of FT-1521Z is 30mA, the positive current voltage is 1.95V, then  

The transmission distance given in Figure 1 does not consider additional system loss. If there is additional system loss, the transmission distance limit needs to be calculated by shifting additional system loss value (in dB) from the left coordinate of Figure 1, for example as below 

When the driving current of FT-1521Z is 30mA, it can be obtained from Figure 1 that the transmission distance can be guaranteed to be 33 meters under full temperature. If there is an additional 2dB of system loss, the transmission distance can still be guaranteed to be 23 meters at full temperature.  

Transmitter index
Transmitter pin definition

Pin	Name	Definition
1	Anode	LED positive pole
2	Cathode	LED negative pole
3	NC	NC
4	NC	NC

Absolute maximum rating

Parameter	Symbol	Min	Max	unit	Explain
Storage temperature	Ts	-40	+85	℃
Working temperature	Ta	-40	+85	℃
Forward DC current	IF		100	mA
Backward voltage	VR		10	V	T=25℃
Circulating lead welding temperature			260/10	℃/s

Photoelectric performance parameters (operating temperature range-40℃ -85℃, power supply voltage range 4.75V <Vcc <5.25V) 

parameter	symbol	Min	Typical	Max	unit	explain
1mmPOF optical fiber output	PT	-8	-5	-3	dBm	IF=60mA,T=25℃
		-10		-2		IF=60mA
Output optical power temperature coefficient	PT/T		-0.45		%/℃
Peak radiation wavelength	PK	640	650	660	nm
Direct voltage	VF	1.85	2.0	2.4	V	IF=60mA
Numerical aperture	NA		0.5
Rise time	Tr		15	17	ns	IF=60mA
Drop-out time	Tf		15	17	ns	IF=60mA

Figure 4 Positive voltage and current curve

Figure 5 Positive current and normalized output optical power curve

Figure 5 shows the positive guide current of FT-1521Z. The corresponding output optical power when the normalized reference is 60mA drive current, the left coordinate is the fold change, and the right coordinate is the dB change.  

The output optical power corresponding to other driving currents can be calculated by FIG. 5, for example below 

As a typical value, the output optical power of FT-1521Z at 60mA driving current at room temperature is-5 dBm. If the driving current of FT-1521Z drops to 30mA, the output optical power is 0.5 times of the optical power at the driving current of 60mA. If the output power can be seen from the right coordinate, the output optical power changes by-3 dBm compared with the driving current of 60mA, which is-8 dBm.    
Receiver metrics
Receiver pin definition

Pin	Name	Definition
1	Vo	outlet end
2	GND	Chip to
3	VCC	Chip power supply
4	RL	head end

Absolute maximum rating value

Parameter	Symbol	Min	Typical	Max	unit
Storage temperature	Ts	-40	+85	℃
Working temperature	Ta	-40	+85	℃
Circulating lead welding temperature			260/10	℃/s
Supply voltage	VCC	-0.5	7	V
	Ts	-40	+85	℃

Photoelectric performance parameters (operating temperature range-40℃ -85℃, power supply voltage range 4.75V <Vcc <5.25V)     

Parameter	Symbol	Min	Typical	Max	unit	Explain
Peak wavelength	λ		650		nm
Input power at an output of 0	PRL	-24		-1	dBm	T=25℃
		-23		-2
Input power at the output of 1	PRH			-40	dBm	VO=5V
Output voltage at low output	VOL		0.2	0.4	V	PR=PRLmin
Leak current at high output	IOH			100	μA	PR=0
Source current	ICCH		5.2	10	mA	VCC=5V,PR=0
Source current	ICCL		5.3	10	mA	VCC=5V,PR=-24dBm
Internal pull-up resistance	RL	800	1000	1200	Ω

Overall dimensions drawing (FT-1521Z / 2521Z)

List of product models

Product model	Description
FT-1521Z	Transmitter
FT-2521Z	Receive devices

 

Important Notice