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MAX3518ETP+G2Z

P1-P3P4-P6P7-P9
DOCSIS 3.0 Upstream Amplifier
MAX3518
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or
visit Maxim’s website at www.maxim-ic.com.
Typical Application Circuit appears at end of data sheet.
General Description
The MAX3518 is an integrated CATV upstream ampli-
fier IC designed to meet the DOCSIS 3.0 requirements,
while disspating only 1.25W. The amplifier covers a
5MHz to 85MHz input frequency range (275MHz, 3dB
bandwidth), and is capable of transmitting four QPSK
modulated carriers, each at +58dBmV, simultaneously
within this range. Both input and output ports are dif-
ferential, 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 MAX3518 operates from a single +5V supply. Four
power codes are provided to allow maximum supply
current to be reduced as determined by distortion
requirements. In addition, for each power code, sup-
ply current is automatically reduced as gain is reduced
while maintaining distortion performance. For DOCSIS
3.0 applications, the MAX3518 draws 300mA at 33dB
gain, dropping to 250mA at 31dB gain. The MAX3518
supply current drops to 5mA between bursts to minimize
power dissipation in transmit-disable mode. Control
logic levels are 3.3V CMOS.
The MAX3518 is available in a 20-pin thin QFN pack-
age, and operates over the extended industrial tem-
perature range (-40°C to +85°C).
Applications
DOCSIS 3.0 Cable Modems
VOIP Modems
Set-Top Boxes
Features
♦ +5V Supply Voltage
♦ Low Power: 1.25W at 31dB Gain, 64dBmV Output
♦ Ultra-Low 25mW Dissipation in Transmit-Disable
Mode
♦ 63dB Gain Control Range in 1dB Steps
♦ -60dBc Harmonic Distortion at 64dBmV Output
♦ Small 5mm x 5mm Thin QFN Package
♦ Low Burst On/Off Transient
♦ 275MHz, 3dB Bandwidth
Ordering Information
MAX3518
2
3
1
IN+
IN-
N.C.*
N.C.
N.C.
N.C.*
V
CC
SCLK
NOTE: N.C.* PINS MUST
BE LEFT UNCONNECTED.
SDA CS TXEN
N.C.N.C. N.C. N.C. V
CC
OUT+
OUT-
13
4
5
14
15
12
11
GND
GND
SERIAL INTERFACE
9 10876
17 16181920
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration/Functional Diagram
SPI is a trademark of Motorola, Inc.
PART TEMP RANGE PIN PACKAGE
MAX3518ETP+ -40°C to +85°C 20 TQFN-EP*
19-4390; Rev 0; 2/09
EVALUATION KIT
AVAILABLE
DOCSIS 3.0 Upstream Amplifier
MAX3518
2 _______________________________________________________________________________________
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.
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) (Note 1)
(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
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0, 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 2)
CAUTION! ESD SENSITIVE DEVICE
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
4.75 5.25 V
Supply Current Transmit Mode I
CC
Gain code = 63, power code = 3 (33dB gain typ) 290 315
mA
Gain code = 59, power code = 1 (29dB gain typ) 160
Supply Current Transmit
Disable Mode
I
CC
TXEN = low 5 6.5 mA
Input High Voltage V
INH
2.0 3.6 V
Input Low Voltage V
INL
0.7 V
Input High Current I
BIASH
10 µA
Input Low Current I
BIASH
-10 µA
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0, 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 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Frequency Range f
IN
(Note 3) 5 85 MHz
Voltage Gain, Z
IN
= 200Ω,
Z
OUT
= 75Ω,
Power Code = 3
(Note 4)
A
V
Gain code = 63 32 33 34
dB
Gain code = 53 22 23 24
Gain code = 43 12 13 14
Gain code = 33 2 3 4
Gain code = 23 -8 -7 -6
Gain code = 13 -18 -17 -16
Gain code = 03 -28 -27 -26
Voltage Gain Variation with
Power Code, Any Gain Code
±0.1 dB
Gain Rolloff
Voltage gain = -28dB to +33dB, f
IN
= 5MHz to
85MHz
-0.3 dB
Gain Step Size
Voltage gain = -28dB to +33dB, f
IN
= 5MHz to
85MHz
0.7 1.0 1.3 dB
DOCSIS 3.0 Upstream Amplifier
MAX3518
________________________________________________________________________________________ 3
Note 2: Min/max values are production tested at T
A
= +85°C.
Note 3: Production tested at 10MHz and 85MHz.
Note 4: Voltage gain does not include loss due to input and output transformers.
Note 5: Guaranteed by design and characterization.
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0, 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 2)
Transmit-Disable Mode
Noise
Any BW = 160kHz from 5MHz to 85MHz, TXEN =
low, voltage gain = -27dB to +33dB (Note 5)
-66 dBmV
Isolation in Transmit-Disable
Mode
TXEN = low 80 dB
Noise Figure NF
Transmit mode, voltage gain = +13dB to +33dB
(Note 5)
11 dB
Noise Figure Slope Transmit mode, voltage gain = -27dB to +33dB -1.0 dB/dB
Transmit-Disable/Transmit-
Enable Transient Duration
TXEN input rise/fall time < 0.1µs 2 µs
Transmit-Disable/Transmit-
Enable Transient Step Size
Gain = 33dB 25 50
mV
P-P
Gain = 4dB 1
Input Impedance Z
IN
Balanced 200
W
Input Return Loss
200Ω system
15 dB
Output Return Loss
75Ω system (Note 5)
11 15 dB
Output Return Loss in
Transmit-Disable Mode
75Ω system, TXEN = low (Note 5)
11 15 dB
2nd Harmonic Distortion HD2
Input tone at 33dBmV, V
OUT
= +64dBmV,
power code = 3 (Note 5)
-70 -57 dBc
3rd Harmonic Distortion HD3
Input tone at 33dBmV, V
OUT
= +64dBmV,
power code = 3 (Note 5)
-60 -56 dBc
Two-Tone 2nd-Order Distortion IM2
Input tones at 30dBmV, V
OUT
= +61dBmV/tone,
power code = 3 (Note 5)
-70 -57 dBc
Two-Tone 3rd-Order Distortion IM3
Input tones at 30dBmV, V
OUT
= +61dBmV/tone,
power code = 3 (Note 5)
-60 -54 dBc
Four Tone Spurs
Four input tones at 27dBmV,
V
OUT
= +58dBmV/tone, power code = 3
-55 dBc
Output 1dB Compression Point P1dB Gain = 33dB 74 dBmV
TIMING CHARACTERISTICS
(Typical Application Circuit as shown, V
CC
= 4.75V to 5.25V, V
GND
= 0, T
A
= -40°C to +85°C, unless otherwise specified. Typical values
are at V
CC
= 5V, T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SEN to SCK Rise Set Time t
SENS
20 ns
SEN to SCK Rise Hold Time t
SENH
10 ns
SDA to SCK Setup Time t
SDAS
20 ns
SDA to SCK Hold Time t
SDAH
10 ns
SCK Pulse-Width High t
SCLKH
50 ns
SCK Pulse-Width Low t
SCLKL
50 ns
Maximum CLK Frequency 10 MHz
P1-P3P4-P6P7-P9

MAX3518ETP+G2Z

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Manufacturer:
Maxim Integrated
Description:
RF Amplifier DOCSIS 3.0 Upstream Amplifie
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