The MAX3520 is an integrated CATV upstream amplifier
IC designed to exceed the DOCSIS 3.0 requirements.
The amplifier covers a 5MHz to 85MHz input frequency
range (275MHz, 3dB bandwidth), and is capable of trans-
mitting four QPSK modulated carriers, each at +58dBmV,
simultaneously within this range. Both input and output
ports are differential, requiring that an external balun be
used at the output port. The gain is controlled in 1dB steps
over a 63dB range using a SPI 3-wire interface.
The MAX3520 operates from a single +5V supply. Four
power codes are provided to allow maximum supply cur-
rent to be reduced as determined by distortion require-
ments. In addition, for each power code, supply current is
automatically reduced as gain is reduced while maintaining
distortion performance. For DOCSIS 3.0 applications, the
MAX3520 draws 360mA at 33dB gain, dropping to 300mA
at 31dB gain. The MAX3520 supply current drops to 5mA
between bursts to minimize power dissipation in transmit-
disable mode. Control logic levels are 3.3V CMOS.
The MAX3520 is available in a 20-pin TQFN package,
and operates over the extended industrial temperature
range (-40°C to +85°C).
●
+5V Supply Voltage
●
Ultra-Low 25mW Dissipation in Transmit-Disable
Mode
●
63dB Gain Control Range in 1dB Steps
●
-63dBc Harmonic Distortion at 64dBmV Output
●
Small 5mm x 5mm TQFN Package
●
Low Burst On/Off Transient
●
275MHz, 3dB Bandwidth
Ordering Information
appears at end of data sheet.
Typical Application Circuit appears at end of data sheet.
Applications
●
DOCSIS 3.0 Cable Modems
●
VOIP Modems
●
Set-Top Boxes
Functional Diagram
N.C.
20
GND
1
N.C.
19
N.C.
18
V
CC
17
N.C.
16
15
N.C.
MAX3520
IN+
2
14
OUT+
IN-
3
13
N.C.
N.C.*
4
SERIAL INTERFACE
12
OUT-
GND
5
6
7
SDA
8
CS
9
TXEN
10
V
CC
11
N.C.*
NOTE:
N.C.* PINS MUST
BE LEFT UNCONNECTED.
SCLK
19-6015; Rev 1; 5/12
MAX3520
DOCSIS 3.0 Upstream Amplifier
Absolute Maximum Ratings
V
CC
to GND .........................................................-0.3V to +5.5V
IN+, IN- ..................................................... -0.3V to (V
CC
+ 0.3V)
OUT+, OUT- ............................................. -0.3V to (V
CC
+ 3.6V)
TXEN, SDA, SCLK,
CS
........................................-0.3V to +4.2V
RF Input Power ..............................................................+10dBm
Continuous Power Dissipation (T
A
= +70°C)
(derate 29mW/°C above T
A
= +70°C) .......................2000mW
Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +165°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
CAUTION!
ESD SENSITIVE DEVICE
DC Electrical Characteristics
(Typical
Application Circuit
as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0V, TXEN = high, T
A
= -40°C to +85°C, unless otherwise speci-
fied. Typical values are at V
CC
= 5V, T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current Transmit
Mode
Supply Current Transmit
Disable Mode
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
SYMBOL
V
CC
I
CC
I
CC
V
INH
I
BIASH
I
BIASH
V
INL
CONDITIONS
Gain code = 63, power code = 3 (33dB gain typ)
Gain code = 59, power code = 1 (29dB gain typ)
TXEN = low
2.0
MIN
4.75
360
190
5
6.5
3.6
0.7
10
-10
TYP
MAX
5.25
385
UNITS
V
mA
mA
V
V
µA
µA
AC Electrical Characteristics
(Typical
Application Circuit
as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0V, TXEN = high, T
A
= -40°C to +85°C, unless otherwise speci-
fied. Typical values are at V
CC
= 5V, T
A
= +25°C.) (Note 1)
PARAMETER
Frequency Range
SYMBOL
f
IN
(Note 2)
Gain code = 63
Gain code = 53
Gain code = 43
A
V
Gain code = 33
Gain code = 23
Gain code = 13
Gain code = 03
Voltage Gain Variation with
Power Code, Any Gain Code
Gain Rolloff
Voltage gain = -28dB to +33dB, f
IN
= 5MHz to
85MHz
CONDITIONS
MIN
5
32
22
12
2
-8
-18
-28
33
23
13
3
-7
-17
-27
±0. 1
-0.3
TYP
MAX
85
34
24
14
4
-6
-16
-26
dB
dB
dB
UNITS
MHz
Voltage Gain, Z
IN
= 200Ω,
Z
OUT
= 75Ω,
Power Code = 3
(Note 3)
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2
MAX3520
DOCSIS 3.0 Upstream Amplifier
AC Electrical Characteristics (continued)
(Typical
Application Circuit
as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0V, TXEN = high, T
A
= -40°C to +85°C, unless otherwise speci-
fied. Typical values are at V
CC
= 5V, T
A
= +25°C.) (Note 1)
PARAMETER
Gain Step Size
Transmit-Disable Mode
Noise
Isolation in Transmit-Disable
Mode
Noise Figure
Noise Figure Slope
Transmit-Disable/Transmit-
Enable Transient Duration
Transmit-Disable/Transmit-
Enable Transient Step Size
Input Impedance
Input Return Loss
Output Return Loss
Output Return Loss in
Transmit-Disable Mode
2nd Harmonic Distortion
3rd Harmonic Distortion
Two-Tone 2nd-Order Distortion
Two-Tone 3rd-Order Distortion
Four Tone Spurs
Output 1dB Compression Point
P
1dB
HD2
HD3
IM2
IM3
Z
IN
NF
SYMBOL
CONDITIONS
Voltage gain = -28dB to +33dB, f
IN
= 5MHz to
85MHz
Any BW = 160kHz from 5MHz to 85MHz, TXEN =
low, voltage gain = -27dB to +33dB (Note 4)
TXEN = low
Transmit mode, voltage gain = +13dB to +33dB
(Note 4)
Transmit mode, voltage gain = -27dB to +33dB
TXEN input rise/fall time < 0.1µs
Gain = 33dB
Gain = 4dB
Balanced
200Ω system
75Ω system (Note 4)
75Ω system, TXEN = low (Note 4)
Input tone at 33dBmV, V
OUT
= +64dBmV,
power code = 3 (Note 4)
Input tone at 33dBmV, V
OUT
= +64dBmV,
power code = 3 (Note 4)
Input tones at 30dBmV, V
OUT
= +61dBmV/tone,
power code = 3 (Note 4)
Input tones at 30dBmV, V
OUT
= +61dBmV/tone,
power code = 3 (Note 4)
Four input tones at 27dBmV,
V
OUT
= +58dBmV/tone, power code = 3
Gain = 32dB
11
11
-1.0
2
25
1
200
15
15
15
-66
-65
-67
-63
-58
74
-57
-59
-57
-57
80
80
11
MIN
0.7
TYP
1.0
MAX
1.3
-66
UNITS
dB
dBmV
dB
dB
dB/dB
µs
mV
P-P
Ω
dB
dB
dB
dBc
dBc
dBc
dBc
dBc
dBmV
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Maxim Integrated
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3
MAX3520
DOCSIS 3.0 Upstream Amplifier
Timing Characteristics
(Typical
Application Circuit
as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0V, T
A
= -40°C to +85°C, unless otherwise specified. Typical
values are at V
CC
= 5V, T
A
= +25°C.) (Note 1)
PARAMETER
SEN to SCK Rise Set Time
SEN to SCK Rise Hold Time
SDA to SCK Setup Time
SDA to SCK Hold Time
SCK Pulse-Width High
SCK Pulse-Width Low
Maximum CLK Frequency
SYMBOL
t
SENH
t
SDAH
t
SDAS
t
SENS
CONDITIONS
MIN
TYP
20
10
20
10
50
50
10
MAX
UNITS
ns
ns
ns
ns
ns
ns
MHz
t
SCLKH
t
SCLKL
Note 1:
Min/max values are production tested at T
A
= +85°C. Min/max limits at T
A
= -40°C and T
A
= +25°C are guaranteed by
design and characterization.
Note 2:
Production tested at 10MHz and 85MHz.
Note 3:
Voltage gain does not include loss due to input and output transformers.
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