HFBR-0537 Avago Technologies US Inc., HFBR-0537 Datasheet - Page 6

• Manufacturer Part Number: HFBR-0537
• Description: Fiber Optics, Evaluation Kit
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-0537

• Tool / Board Applications: Fiber Optic Transceivers
• Mcu Supported Families: HFBR-1527, HFBR-2526
• Development Tool Type: Hardware / Software - Eval/Demo Board
• Main Purpose: Interface, Fiber Optics
• Embedded: No
• Utilized Ic / Part: HFBR-1527, HFBR-2526
• Primary Attributes: DC ~ 32MBd TTL
• Secondary Attributes: TTL-Compatible
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-2146; HFBR-0537

Figure 4. Simple Fiberoptic Reciver for use with dc to 32 MBd Arbitary duty Factor data
Enhanced TTL Compatible Receiver
The receiver circuit shown in Figure 5 is suitable for
use in applications that require greater optical cable
lengths. The receiver in Figure 5 provides 6 dB more
receiver sensitivity than the simplified receiver shown
in Figure 4. Equation 2 allows the designer to quickly
determine the values of C9 and C10 so that the receiver
is optimized for operation at any data rate up to a maxi-
mum of 32 MBd.
Printed Circuit Artwork
The performance of transceivers that use Avago
Technologies’ fiberoptic components are partially
dependent on the layout of the printed circuit board on
which the transceiver circuits are constructed. System
designers are encouraged to embed the printed circuit
designs provided in this application note to achieve the
fiberoptic link performance described in Table 1. The
printed circuit artwork in Figure 6 is for the transmitter
in Figure 3 and the receiver in Figure 4. The printed
Table 3
6
Receiver
Fiber Type
HFBR-25X6Z
5
U3A
HFBR-24X6Z
8
5
U3B
8
1 mm Plastic
1
3
4
2
1
4
6
2
7
3
HFBR-25X6Z – 650 nm
R4
4.7
C6
C7
C5
0.1 mF
200 mm HCS
R5
4.7
R6
R7
270
270
C9
0.1 mF
COILCRAFT 1008LS-122XKBC
COILCRAFT 1008LS-122XKBC
C8
0.1 mF
HFBR-24X6Z – 820 nm
62.5/125 mm
R12
2.2 k
+
circuit artwork in Figure 7 is for the transmitter in Figure
3 and the receiver in Figure 5. Electronic copies of the
Gerber files for the artwork shown in this application
note can be obtained by using the Internet to down-
load the printed circuit designs.
To obtain the artwork for the transmitter shown in
Figure 3 and the receiver shown in Figure 4, download
file from the following URL: http://www.avagotech.com
To obtain the artwork for the transmitter shown in
Figure 3 and the receiver shown in Figure 5, download
file from the following URL: http://www.avagotech.com
Equation 1
C10
10mF
3
2
C6 = C7 =
L2
L3
LT1016CS8
4
1
U4
R8 120 k
5
6
R9
120 k
C11
7
0.1mF
8
(3) (R6 + R7) [ Data Rate (Bd) ]
R10
240
R11
240
HFBR-23X6TZ – 1300 nm
62.5/125 mm
+
C12
10 mF
2
C13
0.1 mF
SYSTEM POWER
NOISY HOST
+5 V
TTL OUT (-)
TTL OUT (+)