AVAGO HFBR-1412TZ Compatible 850nm optical fiber The DC-5 MBd high-performance optoelectronic transceiver device

product presentation
FTBR-1412xx / 2412xx series optical fiber transceiver devices, combined with 850nm multimode optical fiber, provide high performance and low cost optical fiber communication links for industrial, power generation, medical, transportation and game applications. FTBR-1412xx, driven by 6 0 mA current, has a minimum transmission distance of 2000 meters.   

The FTBR-1412xx / 2412xx is fully compatible with the AVAGO’s HFBR-1412 / 2412 series of products, supports industrial standard ST fiber ports, and is optional with threads. FTBR-1412xx / 2412xx is suitable for a variety of fiber core diameter, including 50 / 125 μ m, 62.5/125μ m, 100 / 140 μ m and 200 μ m.   

FTBR-1412xx is a transmitter, which is packaged by a high power LED chip with a peak wavelength of 850nm. The 850nm multimode fiber with 62.5/125μ nm core diameter output a typical optical power value of-16.5dBm under 60mA current drive. FTBR-2412xx is a receiver composed of a high gain span resistance amplifier with integrated photodiode. The output stage is an open-leakage MOSFET structure and supports a maximum output voltage of 18V.

Product characteristics
● Data transfer rate: DC-5 MBd  
● Minimum transmission distance: 2,000 meters  
● The output waveform and pulse width is stable  
● Meet the industrial grade temperature range: -40℃ to 85℃   
● Compliance with the RoHS criteria   
● With a variety of core diameter optical fiber  
● ST connector with thread is optional

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	2	4.1		km	IF=60mA
Output is from low to high time delay	TPLH		72		ns	Fiber length of1m，PR=-21dBm
Output from high to ground delay	TPHL		50		ns	Fiber length of 1m， PR=-21dBm
Pulse length	TP		-22		ns	PR=-21dBm
			-13		ns	PR= -23dBm

Figure 1 Combined with 62.5/125μ m core diameter optical fiber
The FTBR-1412xx / 2412xx transmission distance limit

Figure 2 Combined with 62.5/125μ m core diameter optical fiber
The FTBR-1412xx / HFBR-2412 transmission distance limit

Figure 3. Complex 1, meter optical fiber
Delay time of the FTBR-1412xx / 2412xx

Figure Figure 4 at the 5 MBd rate
Pulse width distortion of FTBR-1412xx / 2412xx

Typical application diagram

Figure 5 Typical application circuit diagram of FTBR-1412xx / 2412xx  

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

If the maximum transmission distance is 1500 meters, according to Figure 1, the driving current of FTBR-1412xx should be 38 mA, and Figure 6 shows that when the drive current of FTBR-1412xx is 38mA, the positive guide voltage is 1.42V, then  

The worst-case scenario when the FTBR-1412xx / 2412xx was mixed with HFBR-1412 / 2412 of AVAGO occurs when emitted as FTBR-1412xx and received as HFBR-2412. Figure 2 shows the transmission distance values when FTBR-1412xx and HFBR-2412 are used. The R1 values can be reasonably selected according to the required transmission distance.   

The transmission distance given in Figure 1 and 2 does not account for additional system loss. If there is additional system loss, the transmission distance limit needs to be calculated through the value (in dB) of additional system loss in Figure 1 and 2, for example as below 

When the driving current of FTBR-1412xx is 38mA, it can be obtained from Figure 1 that its transmission distance can guarantee 1500 meters under full temperature. If there is an additional 2dB of system loss, the transmission distance can still be guaranteed to be 1,000 meters at full temperature. 

Transmitter index
Transmitter pin definition

PIN	Name	definition
1	NC	NC
2	Anode	LED positive pole
3	Cathode	LED negative pole
4	NC	NC
5	NC	NC
6	Anode	LED positive pole
7	Anode	LED positive pole
8	NC	NC

Absolute maximum rating value

Parameter	Symbol	Min	Max	unit	Explain
Storage temperature	Ts	-55	+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 <V cc<5.25V)  

Parameter	Symbol	Min	Typical	Max	unit	Explain
50 / 125 μ m optical fiber output	PT50	-21	-19	-18	dBm	IF=60mA,T=25℃
		-22		-17
62.5/125μ m fiber output	PT62	-18	-16.5	-15.5	dBm	IF=60mA,T=25℃
		-19		-15
A 100 / 140 μ m optical fiber output	PT100	-14	-12	-11	dBm	IF=60mA,T=25℃
		-15		-10
The 200 μ m HCS optical fiber output	PT200	-7	-5.5	-5	dBm	IF=60mA,T=25℃
		-8		-4
Output optical power temperature coefficient	PT/T		-0.3		%/℃
Peak radiation wavelength	PK	845	850	855	nm
Direct voltage	VF	1.4	1.59	1.8	V	IF=60mA

Figure 6 Current and current curve

Figure 7 Current and normalized output optical power curve 

Figure 7 shows the FTBR-1412xx positive guide current and normalized output optical power curve, the corresponding output optical power when the normalized reference is 60 mA 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. 7, for example below 

The typical value of the output optical power of FTBR-1412 xx at normal temperature at 60 mA drive current is-16.5 dBm. If the driving current of FTBR-1412xx is reduced to 30mA, the output optical power is 0.5 times of the output optical power at 60mA drive current. According to the coordinate from the right side, the output optical power changes-3 dBm compared with the 60mA drive current, which is-19.5dBm.

Receiver metrics
Receiver pin definition

PIN	Name	definition
1	NC	NC
2	VCC	Chip power supply
3	GROUND	Chip to
4	NC	NC
5	NC	NC
6	VO	TTL, outlet end
7	GROUND	Chip to
8	NC	NC

Absolute maximum rating

Parameter	Symbol	Min	Max	unit	Explain
Storage temperature	Ts	-55	+85	℃
Working temperature	Ta	-40	+85	℃
Circulating lead welding temperature			260/10	℃/s
Supply voltage	VCC	-0.5	7	V
Output voltage	VO	0	18	V
Fan out capability (TTL)	N		5

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		850		nm
Input power at an output of 0	PRL	-28		-1	dBm	T=25℃,IOL=8mA
		-27		-2		IOL=8mA
Input power at the output of 1	PRH			-35	dBm	VO=5V
Output current at the high output level	IOH		5	250	μA	VO=5V,PR=0
Output voltage at low output	VOL		0.3	0.4	V	IOL=8mA, PR=PRLmin
Power supply current at high output	ICCH		5.2	6	mA	VCC=5V,PR=0
Output the power supply current at a low level	ICCL		5.3	6	mA	VCC=5V,PR=-16.5dBm

Dimdimensions of ST interface (FTBR-1412Z/2412Z)

Outline dimensions of ST interface with thread (FTBR-1412TZ / 2412TZ) 

List of product models

product model	Description
FTBR-1412Z	Transmitter device, and ST interface
FTBR-2412Z	Receive the device, and the ST interface
FTBR-1412TZ	Transmitter device, threaded ST interface
FTBR-2412TZ	Receiving device, threaded ST interface