M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
Features
Applications
• Low-cost IC, fabricated in sub-micron CMOS
• SDH / SONET / ATM
• Receiver sensitivity typically -40 dBm at 155 Mbps, when integrated into a
module with suitable photodiode and post-amplifier
• Fast Ethernet
• 115 MHz bandwidth allows wide range of operation; suitable for 100, 125
and 155 Mbps
• Typical differential gain of 200 kΩ at low signal levels
• AGC gives continuous operation to >0 dBm
• 165 mW power consumption at +5 V supply
• > 35 dB Power-supply noise rejection
• Available as die
The M02006 is a low-noise, transimpedance amplifier with AGC, manufactured in sub-micron CMOS. Its wide
dynamic range, differential output and high PIN bias make it well suited for telecommunications, especially OC-3/
STM-1. However, the M02006 is intended to meet the needs of both Telecom and Datacom users.
The M02006 is available only in die form. For optimum system performance, die should be mounted in close
proximity with the photodetector.
The M02006 is designed to be used with the MC2045 postamplifier IC. When combined with a photodiode, the chip
set forms a high performance, low cost 5 V receiver.
Functional Block Diagram
Series Pass
Regulator
PIN K
Bandgap
1.234v
Reference
Generator
AGC Control
R
DOUT
+1
PIN A
TZA
+1
DOUT
+1
1
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
Ordering Information
Part
Pin-package
M02006E-DIE (1)
Available in waffle pack, whole wafer on a grip ring and one-quarter wafer
(2)
Available in waffle pack, whole wafer on a grip ring and one-quarter wafer
M02006F-DIE
NOTES:
1.
M02006E transimpedance limits are 60kΩ to 88kΩ
2.
M02006F transimpedance limits are 88kΩ to 110kΩ
Revision History
Revision
Level
Date
V4
Release
May 2015
C (V3)
Release
August 2010
Description
Updated logos and page layout. No content changes.
Changed the max Icc from 35 mA to 38 mA (Table 1-2).
Corrected the Max/Min columns on Table 1-3. Added new ordering information. Remove
package information since device is die sales only.
B (V2)
Release
June 2006
Updated format.
Updated Absolute Maximum Ratings.
Added TIA Use with Externally Biased Detectors section.
A (V1)
Release
February 2002
Initial Release.
Top Level Diagram
VCC
DOUT
GND
PINK
PINA
VCC
DOUT
GND
2
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
1.0 Product Specification
1.1
Absolute Maximum Ratings
Table 1-1.
Absolute Maximum Ratings
Symbol
TA
TSTG
V_PINA,
V_PINK,
V_Dout,
V_DoutB,
I_PINK
VCC
1.2
Parameter
Rating
Units
Operating ambient
-40 to +85
°C
Storage temperature
-65 to +150
°C
-0.4 to VCC +0.4
V
10
mA
-0.4 to 6
V
Input voltage at PINA, PINK, Dout, DoutB
Maximum Current sourced out of PINK
Power Supply (VCC – GND)
DC Characteristics
Table 1-2.
DC Characteristics
Symbol
Parameter
Min.
Typ.
Max.
Units
VB
PIN bias voltage (PINK - PINA)
2
2.3
2.6
V
VCM
Common mode output voltage
-
VCC/2
-
V
ICC
Supply current (no loads)
-
-
38
mA
3
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
1.3
Rev V4
AC Characteristics
Table 1-3.
AC Characteristics
Symbol
Parameter
Min.
Typ.
Max.
Units
ROUT
Output impedance (single ended)
-
50
-
Ω
INOISE
Input noise current (1), (2)
-
7.5
12
nArms
PIN(mean), Min.
Optical sensitivity (1), (2)
-40
-
-37
dBm
IMAX
Input overload current
2.2
4.5
-
mAPP
PIN(mean), Max.
Optical saturation (2)
-
+3
-
dBm
G
Small signal transimpedance (3), (4), (5)
kΩ
Single ended:
-
-
130
Differential:
-
-
260
VD
Differential output voltage (3)
-
-
800
mV
BW
Bandwidth to -3 dB point (electrical)
100
-
-
MHz
TrTf
Data out rise/fall times (20% - 80% points)
-
-
2
ns
Pulse width distortion
-
-
1
%
OSPULSE
Pulse overshoot
-
-
3
%
TAGC
AGC setting time
-
-
100
µs
OSAGC
AGC overshoot
-
-
12
%
PSRR
Power supply rejection ratio (<4 MHz)
40
-
-
dB
TPWD
NOTES:
1.
Measured with input capacitance, CIN = 0.7 pF to 1.0 pF
2.
Assuming photodiode response of 0.9 A/W, extinction ratio of 10 dB and BER of 10-10
3.
The 2006 is designed to drive a load >500 Ω. Measurements are taken into high Z
4.
Measured at 10 MHz
5.
Measured at input current = 2μAPP
4
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Figure 1-1.
Rev V4
Typical Performance Curves
2 5 0 .0
Typical gain vs input level
2 0 0 .0
Gain (k)
1 5 0 .0
1 0 0 .0
5 0 .0
0 .0
-3 8
-3 6
-3 4
-32
-30
-2 8
-2 6
-2 4
-2 2
-20
-1 8
-16
-1 4
-1 2
-1 0
-8
-6
-4
-2
0
In p u t ( d B m )
1400
Differential output vs input
1200
Diff Output (mV
1000
800
600
400
200
0
-4 0
-3 5
-3 0
-2 5
-2 0
-1 5
-1 0
-5
0
I np ut (d B m )
Transimpedance (ohms)
1000000
Transimpedance vs frequency
(@ -40 dBm optical input power)
(VCC = 5.0V, +21 °C)
100000
10000
1000
0.01
0.1
1
10
Frequency (MHz)
100
max
1000
average
min
5
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
2.0 Pin Description
2.1
Pin Descriptions
Table 2-1.
Pin Descriptions
Die Pad No
Name
Function
1, 8
GND
Ground pin. Connect to the most negative supply, Both pins should be used
2
DOUT
Non-inverted data output. Differential output with DOUT (goes high as light increases)
3, 6
VCC
Power pin. Connect to most positive supply. Either or both pins may be used
4
PINK
PIN cathode connection. Connect between this pin and PINA. Connect a decoupling capacitor to ground
5
PINA
PIN anode connection. Connect between this pin and PINK
7
DOUT
Inverted data output. Differential output with DOUT
6
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
3.0 Functional Description
3.1
Overview
The M02006 is a low-noise, transimpedance amplifier with AGC, manufactured in sub-micron CMOS. Its wide
dynamic range, differential output and high PIN bias make it well suited for telecommunications, especially OC-3/
STM-1. However, the M02006 is intended to meet the needs of both Telecom and Datacom users.
The M02006 is available only in die form. For optimum system performance, die should be mounted in close
proximity with the photodetector.
The M02006 is designed to be used with the MC2045 postamplifier IC. When combined with a photodiode, the chip
set forms a high performance, low cost 5 V receiver.
Figure 3-1.
Functional Block Diagram
Series Pass
Regulator
PIN K
Bandgap
1.234v
Reference
Generator
AGC Control
R
DOUT
+1
PIN A
TZA
+1
DOUT
+1
7
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
3.2
Rev V4
TZA
The transimpedance amplifier consists of a high gain single-ended CMOS amplifier, with a feedback resistor. The
feedback creates a virtual low impedance at the input and nearly all of the input current passes through the
feedback resistor, defining the voltage at the output. Advanced CMOS design techniques are employed to maintain
the stability of this stage across all input conditions.
Single-ended amplifiers have inherently poor power supply noise rejection. For this reason, an on-chip low dropout
linear regulator has been incorporated into the design to give excellent noise rejection up to several MHz. Higher
frequency power supply noise is removed by external decoupling.
The circuit is designed for PIN photodiodes in the grounded cathode configuration, with the anode connected to the
input of the TZA and the cathode connected to AC ground. Reverse dc bias is applied via PINK to reduce the
photodiode capacitance.
3.3
AGC
The M02006 has been designed to operate over the input range of +3 dBm to –39 dBm at long wavelengths.
This represents a ratio of 1:12500, whereas the acceptable dynamic range of the output is only 1:250 which implies
a compression of 50:1 in the transimpedance.
The design uses a MOS transistor configured as a voltage controlled resistor to achieve transimpedance variation,
which allows the device to maintain a relatively constant output amplitude over more than 30db of optical input
power.
3.4
Output Stage
The signal from the TZA enters a phase splitter and a pair of voltage follower outputs. These are designed to drive
a high impedance (>500 Ω) load. They are stable for driving capacitive loads, such as interstage filters.
8
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
4.0 Applications
4.1
Filter Design
The achievable sensitivity of the M02006 is dependant on the noise bandwidth of the amplifier, which varies with
temperature and process. The bandwidth should therefore be limited by an interstage filter. This will typically
employ a one pole filter, using a capacitor across the outputs. For maximum sensitivity, a filter with steeper roll-off
and better transient response can be implemented with inductors and capacitors. If the module is intended to be
used at several rates, interstage filtering should not be employed. A typical application circuit is shown in
Figure 4-1.
Figure 4-1.
Typical Applications Circuit
+5 V
10 nF
MC2045
Post Amplifier
*470 pF
10 nF
V CC
D OUT
Gnd
D IN
PIN
K
CFILT
PIN
A
D IN
V CC
D OUT
Gnd
10 nF
* The 470pF capacitor should be mounted inside the TOcan/optical sub assembly with the photodiode
9
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
4.2
Rev V4
Alternative Input Arrangement
An alternative arrangement can be used to connect the photodiode, with the photodiode cathode being connected
directly to VCC see Figure 4-2. This requires two decoupling capacitors, one connecting VCC to ground and the
other from PIN K to ground. This arrangement gives slightly more reverse bias on the photodiode, but will have
worse low frequency noise performance.
Figure 4-2.
Alternative Application Arrangement
+5 V
10 nF
1 nF
470 pF
VCC
PIN
K
PIN
A
VCC
10
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
4.3
Rev V4
Layout Considerations
Use good high-frequency design and layout techniques, taking care to bypass VCC over the frequencies to several
hundred MHz. When using die, take care to minimise bond-wire length, especially for the PIN A and Gnd pads. A
typical TO-can assembly is shown in Figure 4-3.
Figure 4-3.
Typical TO-can Assembly
DOUT
DOUT
4 7 0 p F
Gnd
VCC
11
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
4.4
Rev V4
TIA Use with Externally Biased Detectors
In some applications, MACOM TIAs are used with detectors biased at a voltage greater than available from TIA
PIN cathode supply. This works well if some basic cautions are observed. When turned off, the input to the TIA
exhibits the following I/V characteristic as shown in Figure 4-4.
Figure 4-4.
TIA Use with Externally Biased Detectors, Powered Off
PINA Unbiased
100
50
0
-800
-600
-400
-200
0
200
400
600
800
1000
1200
µA
-50
-100
-150
-200
-250
-300
mV
12
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
In the positive direction after about 700 mV, the impedance of the input is relatively high. After the TIA is turned on,
the DC servo and AGC circuits attempt to null any input currents (up to the absolute maximum stated in the device
table) as shown by the I/V curve in Figure 4-5.
Figure 4-5.
TIA Use with Externally Biased Detectors, Powered On
PINA biased
1000
800
600
400
µA
200
0
-300
-200
-100
0
100
200
300
400
500
600
700
-200
-400
-600
-800
-1000
mV
It can be seen that any negative voltage below 200 mV is nulled and that any positive going voltage above the
PINA standing voltage is nulled by the DC servo. The DC servo upper bandwidth varies from part to part, but is
generally at least 10 kHz.
When externally biasing a detector such as an APD with a voltage in the 30-80V range, care should be taken to
power up the TIA first and to keep the TIA powered up until after the power supply voltage on the APD is removed.
Failure to do this with the TIA unpowered may result in damage to the input FET gate at PINA. In some cases the
damage may be very subtle, in that nearly normal operation may be experienced with the damage causing slight
reductions in bandwidth, and corresponding reductions in input sensitivity.
4.4.1
13
Treatment of PINK
PINK still requires bypassing to ground with a high quality 220-1000 pf (470 pf recommended) capacitor, even with
no other connection to it. The capacitor stabilizes the internal voltage regulator of the TIA.
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
5.0 Packaging Specification
Figure 5-1.
Bare Die Information
GND
GND
DOUT
DOUT
VCC
VCC
PINK
PINA
Die size : 1.01 x 0.96 mm
Die Thickness : 300 µm ±10%
14
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Table 5-1.
Rev V4
Pad Coordinates
Pad No
Description
X (µm)
Y (µm)
1
GND
-347
255
2
DOUT
-347
109
3
VCC
-347
-255
4
PINK
-202.6
-348.45
5
PINA
-35.45
-352.3
6
VCC
347
-255
7
DOUT
347
109
8
GAN
347
255
15
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M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
M/A-COM Technology Solutions Inc. All rights reserved.
Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM")
products. These materials are provided by MACOM as a service to its customers and may be used for
informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or
in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM assumes
no responsibility for errors or omissions in these materials. MACOM may make changes to specifications and
product descriptions at any time, without notice. MACOM makes no commitment to update the information and
shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its
specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any
intellectual property rights is granted by this document.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR
WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL
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WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
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using or selling MACOM products for use in such applications do so at their own risk and agree to fully indemnify
MACOM for any damages resulting from such improper use or sale.
16
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