CX60083 Limiting Amplifier Datasheet

CX60083 Datasheet, PDF, Equivalent


Part Number

CX60083

Description

10 Gbps High Gain Limiting Amplifier

Manufacture

Mindspeed Technologies

Total Page 14 Pages
Datasheet
Download CX60083 Datasheet


CX60083
Data Sheet
CX60083-15/-2A
10 Gbps High Gain Limiting Amplifier
Key Features
Applications
Limiting amplifier
Fiber-optic communications (OC-48/OC-192)
Integrated LOS and peak detect circuit
Wide bandwidth and high sensitivity
mCompatible with DC- or AC-coupled input and output signals
Fully differential architecture
oOptional single-ended input and/or output operation
.cAvailable in a 32-terminal, 5 mm square EdQuad TQFP or as dice
Product Description
SONET/SDH test equipment
Data communications
UThe CX60083 is a high-gain, wide-bandwidth, limiting amplifier ideal for use as a post-amplifier in fiber-optic receivers. With its 10GHz
t4bandwidth, this amplifier has been optimized for data rates up to 10.7 Gbps and has an input sensitivity (BER < 10-10) of 5 mV, differential. It
accepts both single-ended and differential inputs and may be either AC- or DC- coupled. With approximately 39 dB of small signal gain, this
eamplifier can limit input voltages at or above 5 mV P-P (single-ended) to an output voltage of 460 mV P-P (single-ended).
An on-chip Loss of Signal (LOS) detection circuit with hysteresis provides an LOS output signal. A high-gain, on-chip, peak detector provides a
eDC output signal that is linearly proportional to the input signal amplitude. This signal can be used for Automatic Gain Control (AGC) of preceding
hamplifier stages or a custom LOS network. High-impedance differential outputs and inputs are available for input voltage offset correction.
The CX60083, as shown in Figure 7, is available in a 32-terminal flat pack or as shown in Figure 9 in die form. Figure 1 is the system block
Sdiagram.
.DataFigure 1. CX60083 System Block Diagram
wVthCap OffInP
wSupply
w mVoltage
DataInP
52k
U.coT I A
t4Avalanche
ePhotodiode
50
Vth
50
SheAC or DC Coupled DataInN
2k
PkDetOut
LOSRes
OffOutP
PkDetDC
LOS
Peak
Detect
CX60083
LOS
Detect
10k
10k
See Figure 3 for
AC-Coupled
DatOutP
Clock
Data
Recovery
Unit
DatOutN
ataOffInN
OffOutN
www.DRev.v6, 12 Apr 2002.
Information provided in this Data Sheet is subject to change without notice.
MindspeedTM Technologies, Inc.
Pg. 1 of 14

CX60083
Signal Amplification and Termination
CX60083-15/-2A, 10 Gbps High Gain Limiting Amplifier
The CX60083 is optimized to accept up to 10.7 Gbps data on the 50 inputs DataInP and DataInN. The input signal is amplified 39 dB up to
approximately 460 mV PP (single-ended) and is limited to this value with any further input signal increase. Data rates greater than 10.7 Gbps
(including 12.5 Gbps) may be input but with reduced small signal gain.
The outputs are available at the DataOutP and DataOutN pins. The outputs have an internal 50 impedance and are designed to drive a 50
load. When terminated in 50 , the outputs swing between approximately –50 mV and approximately –510 mV.
The DataInP and DataInN inputs can be driven either differentially or single-ended, and can be DC-coupled or AC-coupled. Each of the
differential inputs has a 50 resistor terminated to the Vth terminal. In most cases Vth is grounded. However, it may be necessary to connect
Vth to a DC potential to ensure the input signal does not exceed the maximum or minimum CX60083 peak input voltage. These requirements are
described in more detail in Figure 4 and in the application note CX60083AN1: Input and Output Interface Terminations. VthCap provides for
additional (optional) decoupling of Vth.
Table 1 lists the CX60083 terminal name descriptions.
Table 1. Terminal Name Descriptions
Terminal Name Terminal Number
Description
VthCap
2 Vth Decoupling
DataInP
4 High-speed Input Data (non-inverting polarity)
DataInN
5 High-speed Input Data (inverting polarity)
Vth 7 DataIn termination (Input Common Mode Voltage input when AC-coupled)
OffInN
10 Negative Offset Control Input
OffInP
11 Positive Offset Control Input
OffOutP
15 Offset Sense Output (non-inverting)
OffOutN
16 Offset Sense Output (inverting)
DataOutN
20 High-speed Output Data (inverting polarity)
DataOutP
21 High-speed Output Data (non-inverting polarity)
PkDetDC
27 Peak Detector DC Reference
PkDetOut
28 Peak Detector Output
LOSRes
29 Loss Of Signal threshold control resistor
LOS 30 Loss Of Signal (active high)
Vee 1, 8, 17, 24, 25, 32 Power Supply
Gnd 3, 6, 9, 12, 13, 14, Ground
18, 19, 22, 23, 26, 31
EP Exposed Paddle Package or die backside
Note 1: These are 50 matched terminals.
Note 2: The package or die backside should be well connected to ground using either conductive epoxy or solder.
Signal
DC
RF(1)
RF(1)
Power
Analog
Analog
Analog
Analog
RF(1)
RF(1)
DC
DC
DC
DC
Power
Power
DC(2)
Output Terminations
The outputs DataOutP and DataOutN can be either DC- or AC-coupled to the succeeding stage. For further details see Application Note
CX60083 AN1.
Offset Sense and Compensation
Differential output signals at DataOutP and DataOutN connect to pins OffOutP and OffOutN, respectively, via internal 10 kresistors. These
pins can be used to reduce output offset that might produce pulse width distortion. The offset sense outputs indicate any DC offset voltage
between the differential outputs. They may be used in a feedback circuit to compensate for any internal voltage offset. The output of the offset
compensation circuit may be applied to one or both of the input offset compensation pins: OffInP and OffInN.
Output Signal Peak Detection
The on-chip peak detector generates a DC voltage on PkDetOut, which is proportional to the input signal amplitude. The PkDetDC output is the
DC reference voltage for the PkDetOut output signal. The difference between the PkDetOut and PkDetDC pins is a voltage, which is
Rev. v6, 12 Apr 2002.
Information provided in this Data Sheet is subject to change without notice.
MindSpeed Technologies, Inc.
Pg. 2 of 14


Features Data Sheet CX60083-15/-2A 10 Gbps High Gain Limiting Amplifier Key Features • • • • • • Limiting ampl ifier Integrated LOS and peak detect ci rcuit Wide bandwidth and high sensitivi ty Compatible with DC- or AC-coupled in put and output signals Fully differenti al architecture Optional single-ended i nput and/or output operation Available in a 32-terminal, 5 mm square EdQuad TQ FP or as dice Applications • • • Fiber-optic communications (OC-48/OC-1 92) SONET/SDH test equipment Data commu nications Product Description The CX6 0083 is a high-gain, wide-bandwidth, li miting amplifier ideal for use as a pos t-amplifier in fiber-optic receivers. W ith its 10GHz -10 bandwidth, this ampli fier has been optimized for data rates up to 10.7 Gbps and has an input sensit ivity (BER < 10 ) of 5 mV, differential . It accepts both single-ended and diff erential inputs and may be either AC- o r DC- coupled. With approximately 39 dB of small signal gain, this amplifier can limit input voltages at or above 5 mV P-P.
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