Qorvo QPB7432 User manual
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 1 of 9 -
www.qorvo.com
®
Document Overview
Keywords:
FTTH xPON Video Receiver, QPB7432, Optical Node, Low Noise TIA
Abstract:
This document explains how to use and test the QPB7432 Optical Receiver Evaluation board.
Revision History:
Rev 1.0 Initial Release
Ordering Information
Part Number
Description
QPB7432PCK
Optical Receiver Reference design with 5-piece sample bag
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 2 of 9 -
www.qorvo.com
®
The QPB7432 is a 47 – 1218 MHz High Gain, Low EIN, Single ended RF Optical Receiver for FTTH PON applications. It is
a technology leader with an optical input range from -18 dBm to 0 dBm. The QPB7432, with recommended external
control circuitry, provides automatic gain control to maintain a constant +14 dBmV to +20 dBmV / channel output to insure
consistent video quality. It runs on a single +5 V supply eliminating the need for an extra ONT supply.
The QPB7432PCK comes with one Optical to Electrical Receiver evaluation board and five QPB7432 ICs as shown in the
picture below
Figure 1
Introduction
What is in the box
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 3 of 9 -
www.qorvo.com
®
RFSA3043
Variable
Attenuator
Feedback
Circuit
QPB7432
QPB7432 OPTICAL RECEIVER BLOCK
DIAGRAM
6 Pin Header
RF OUT
QPB7420
Discrete
Equalizer+
Match
PD Bias
Circuit
OPS
OPS
5V/110mA 5V/2mA 5V/55mA
12V
5V
GND
Mode
Mode
VC
VC
5V
Feedback
Circuit
Figure 2
EVB Block Diagram
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 5 of 9 -
www.qorvo.com
®
QPB7432 OPTICAL RECEIVER
O/E Gain Measurement Set-up
Light Source
Optical Attenuator
The DUT
QPB7432 Optical Receiver + RFSA3043 Variable
Attenuator + QPB7420 RF Amp
Multimeter
OPS
DC Power Supply
DC Power Supply
Vc
VDD
Network Analyzer
GND
GND
GND
Reference Receiver Only
for Calibration
Figure 4
O/E Gain Measurement Set-up
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 6 of 9 -
www.qorvo.com
®
QPB7432 OPTICAL RECEIVER
Noise Measurement Set-up
The DUT
QPB7432 Optical Receiver + RFSA3043 Variable
Attenuator + QPB7420 RF Amp
DC Power Supply
DC Power Supply
Vc
VDD
Noise Figure Meter
Noise Source Used only
for Calibration
Figure 5
Noise Measurement Set-up
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 7 of 9 -
www.qorvo.com
®
1. Clean the optical connector with an Optical Fiber Connector Cleaner* and connect the input from the optical
source/Optical attenuator.
2. Connect the RF out to Spectrum Analyzer or Network Analyzer as needed
3. Most of the test setup for this EVB requires two power supplies and a multimeter
4. GND - Connect the GND of all power supplies and the multimeter to the GND pin of the 6-pin header. This has to
be done before connecting any supply to the EVB to avoid issues related to floating GND.
5. 12V - Leave the 12V unconnected as the board is configured for 5V only operation from the factory
6. OPS - Connect the Optical Power Sense pin to a multimeter to measure volts
7. MODE - The MODE is pre-set to high. Leave it unconnected.
8. Vc - Attenuator Control voltage pin: Connect this pin to a DC variable supply which can vary from 0V to 4.5V. Do
not switch on the power at this point.
9. 5V –Vdd supply pin –Set the DC Lab power supply with current limit to 5V, limit the current to 225mA and then
connect to this pin. Make sure the current drawn is less than 200mA.
10. Switch on the 5 Volt DC power supply for Vc and perform the test
6 Pin Header
OPS
12V
GND
Mode
VC
5V
The EVB is configured to work with 5Volt from the Factory. To convert to 12Volts operation the following steps need to be
taken:
1. Disconnect any power connected to the EVB
2. Remove (Do NOT populate) the parts L10, L12 and R17
3. Populate the Inductor L11
4. Change the value of R4 to 1kOhms
Now the board is configured to work with 12 Volts supply. To proceed with the tests, connect the second pin of the
header to 12V and setup the current to same 225mA. Leave the 5V pin (last pin of the connector unconnected.
The Board may get warmer than the 5V operation as the extra power is being dissipated via the resistors.
•Please use NTT AT CLETOP Reel or similar cleaner
Test set-up for 5V operation
Test set-up for 12V operation
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 8 of 9 -
www.qorvo.com
®
Optical to Electrical Receiver Application Specifications
Parameter
Condition (1)
Min
Typ
Max
Unit
Supply Current (IDD)
Steady state operation
160
mA
Frequency Range
47
1218
MHz
Optical Gain
At 550MHz. O/E gain is defined by 20*log (Zt/75)
44.5
dB
Gain Flatness
±1.5
dB
Tilt
Linear tilt from 45 – 1218 MHz; higher tilt can be
achieved by changing components
6
dB
Equivalent Input Noise
3.5
pA / √Hz
RF Output Level at
547.25 MHz
RF Output Level at 547.25 MHz
+14
dBmV/ch
At 45 MHz
−17
dB
Output Return Loss
At 600 MHz
−15
dB
At 1218 MHz
−18
dB
MER
90MHz to 850MHz, 0dB tilt, 96 channels, 8MHz
spacing. ITU-T Annex A 256 QAM 6.952
Msymbols/s. OMI = 3.5%
32
dB
BER
2.0E-5
Gain Control Range
Using suggested application circuit
30
dB
Notes:
1. Typical performance at these conditions:
Temperature =+25 °C, VDD=+5 V, Optical Input to Electrical RF Out - Receiver reference design
Optical Input Requirements
Parameter
Unit
Min
Typical
Max
Optical Input Power
dBm
−18
0
Optical Modulation Index (OMI)
% / ch (79ch)
3.5
1550 nm PIN Responsivity
mA/mW
0.95
1550 nm PIN Capacitance
pF
0.35
QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual –Rev 02, Aug 12, 2018
- 9 of 9 -
www.qorvo.com
®
Important Notice
The information contained herein is believed to be reliable; however, Qorvo makes no warranties regarding the information contained
herein and assumes no responsibility or liability whatsoever for the use of the information contained herein. All information contained
herein is subject to change without notice. Customers should obtain and verify the latest relevant information before placing orders for
Qorvo products. The information contained herein or any use of such information does not grant, explicitly or implicitly, to any party any
patent rights, licenses, or any other intellectual property rights, whether with regard to such information itself or anything described by
such information. THIS INFORMATION DOES NOT CONSTITUTE A WARRANTY WITH RESPECT TO THE PRODUCTS DESCRIBED
HEREIN, AND QORVO HEREBY DISCLAIMS ANY AND ALL WARRANTIES WITH RESPECT TO SUCH PRODUCTS WHETHER
EXPRESS OR IMPLIED BY LAW, COURSE OF DEALING, COURSE OF PERFORMANCE, USAGE OF TRADE OR OTHERWISE,
INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Without limiting the generality of the foregoing, Qorvo products are not warranted or authorized for use as critical components in medical,
life-saving, or life-sustaining applications, or other applications where a failure would reasonably be expected to cause severe personal
injury or death.
Copyright 2018 © Qorvo, Inc. | Qorvo is a registered trademark of Qorvo, Inc.
Contact Information
For the latest specifications, additional product information, worldwide sales and distribution locations:
Web: www.qorvo.com
Tel: 1-844-890-8163
Table of contents
