19-2092; Rev 0; 7/01
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
General Description
The MAX3507 is a variable-gain power amplifier for use
in CATV upstream transmitters. The variable-gain fea-
ture has 55dB of dynamic range and is controlled by a
3-wire SPI™ bus. The device is capable of generating
+64dBmV output (16QAM/QPSK) when driven with a
+34dBmV nominal input signal. The on-chip anti-alias
lowpass filter with 75MHz cutoff frequency saves sys-
tem design cost and space. The optional positive slope
generator provides system design flexibility.
The device operates from a single +5V supply and
draws 220mA nominal during transmit at max gain
(100% duty cycle). For burst-type transmissions, the
device is shut off between bursts to minimize noise and
save power while still maintaining a match at the output.
The device is optimized for high linearity with harmonic
levels below -55dBc.
The MAX3507 is available in a 28-pin QFN package
and operates over the extended industrial temperature
range (-40°C to +85°C).
o
5MHz to 65MHz Operation
o
55dB Gain Control Range
o
Optional Positive Slope Generator
o
55dB Spurious-Free Dynamic Range Over
Transmit Band
Features
o
Built-In 5th-Order Elliptic Anti-Aliasing Filter
MAX3507
Ordering Information
PART
MAX3507EGI
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QFN
Applications
Cable Modem Upstream Transmitter
Set-Top Box Upstream Transmitter
Telephony Over Cable
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
V
CC
V
CC
GND
GND
N.C.
V
CC
EQ+
28
BIASF
1
EQ-
27
26
25
24
23
V
CC
22
TXEN
21
BIAS
CIRCUIT
DC+
V
CC
20
N.C.
2
DC-
3
OPTIONAL
EQUALIZER
GND
V
CC
V
CC
5-POLE
ELLIPTIC
FILTER
19
OUT+
4
18
OUT-
4:1
IMPEDANCE
RATIO
5
SERIAL DATA
17
GAIN
CONTROL
16
N.C.
IN+
6
CEXT
IN-
7
8
GND
9
CS
10
SDA
11
SCLK
MAX3507
12
GND
13
N.C.
14
SHDN
15
N.C.
V
CC
DIGITAL
CONTROL
LINES
SPI is a trademark of Motorola, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
MAX3507
ABSOLUTE MAXIMUM RATINGS
V
CC
, OUT+, OUT- to GND.....................................-0.5V to +8.0V
Input Voltage Levels (all inputs),
C
EXT
to GND ...........................................-0.3V to (V
CC
+ 0.3V)
Continuous Input Voltage (IN+, IN-) ..................................2Vp-p
Continuous Current (OUT+, OUT-) ..................................120mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QFN (derate 20.8mW/°C above +70°C) ..............1.67W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +125°C
Bump Reflow Temperature ..............................................+300°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.
DC ELECTRICAL CHARACTERISTICS
(MAX3507 EV Kit, V
CC
= +4.75V to +5.25V, V
GND
= 0, V
TXEN
= V
SHDN
= V
CC
, D7 = 1, T
A
= -40°C to +85°C, unless otherwise speci-
fied. No input signal applied. A 4:1 (300Ω to 75Ω) impedance ratio balun is connected to differential output ports and balun output is
terminated into a 75Ω load. Typical parameters are at V
CC
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
D7 = 1, gain code = 127 (max gain)
Supply Current Transmit Mode
D7 = 1, gain code = 119 (gain of 28dB)
D7 = 1, gain code = 64 (gain of 0dB)
D7 = 0, gain code = 94 (gain of 0dB)
Supply Current Transmit Disable
Mode
Shutdown Supply Current
LOGIC INPUTS
Input HIGH Voltage Threshold
Input LOW Voltage Threshold
Input HIGH Current
Input LOW Current
-100
2.0
0.8
100
V
V
µA
µA
V
TXEN
= V
EE
, V
SHDN
= V
CC
V
TXEN
= X, V
SHDN
= V
EE
CONDITIONS
MIN
4.75
218
164
82
74
45
1
59
mA
µA
TYP
MAX
5.25
280
mA
UNITS
V
2
_______________________________________________________________________________________
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
AC ELECTRICAL CHARACTERISTICS
(MAX3507 EV Kit, V
CC
= +4.75V to +5.25V, V
GND
= 0, V
TXEN
= V
SHDN
= V
CC
, V
IN
= +34dBmV differential, T
A
= -40°C to +85°C,
unless otherwise specified. A 4:1 impedance ratio (300Ω to 75Ω) balun is connected to differential output ports and balun output is
terminated into a 75Ω load. Typical parameters are at V
CC
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
D7 = 1, gain code = 125
D7 = 1, gain code = 119
D7 = 1, gain code = 104
f
IN
= 5MHz,
T
A
= 0°C to +85°C
(Note 2)
D7 = 1, gain code = 84
D7 = 1, gain code = 64
D7 = 0, gain code = 74
D7 = 0, gain code = 54
D7 = 0, gain code = 42
f
IN
= 65MHz,
D7 = 1, gain code = 127
T
A
= 0°C to +85°C
(Note 3)
V
OUT
= 61dBmV, f
IN
= 42MHz, equalizer disabled (Note 3)
V
OUT
= 61dBmV, f
IN
= 65MHz, equalizer disabled (Note 3)
f
IN
= 5MHz to 65MHz, A
V
= -26dB to +30dB
Gain Step Size
f
IN
= 5MHz to 65MHz, A
V
= -26dB to +30dB, any 2-bit
transition of D0, D1
f
IN
= 5MHz to 42MHz, D7 = 0, gain code = 109; D7 = 1,
gain code = 81, T
A
= 0°C to +85°C
Transmit-Disable Mode Noise
Isolation in Transmit Disable
Mode
Transmit Mode Noise
Transmit Enable Transient
Duration
Transmit Disable Transient
Duration
Transmit Disable/Transmit
Enable Transient Step Size
Input Impedance
Output Return Loss
Output Return Loss in Transmit
Disable Mode
Any BW = 160kHz from 5MHz to 65MHz, TXEN = V
EE
(Note 3)
TXEN = V
EE
, f
IN
= 5MHz to 65MHz
Any BW = 160kHz from 5MHz to 65MHz, gain = -26dB to
+30dB (Note 3)
TXEN input rise/fall time < 0.1µs,
T
A
= +25°C (Notes 3, 4)
TXEN input rise/fall time < 0.1µs,
T
A
= +25°C (Notes 3, 4)
D7 = 1, gain code = 119 (A
V
= >27dB), T
A
= +25°C
D7 = 0, gain code = 94 (A
V
= 0), T
A
= +25°C (Note 3)
f
IN
= 5MHz to 65MHz, single ended (Note 3)
f
IN
= 5MHz to 42MHz in 75Ω system, D7 = 1,
gain code = 125 (A
V
= 30dB) (Note 5)
f
IN
= 5MHz to 42MHz in 75Ω system, TXEN = V
EE
(Note 5)
0.8
10
10
1.5
70
-54.5
2
2
100
5.2
0.7
0.6
MIN
29.6
26.8
19.5
9.7
-0.7
-10.5
-20.4
-27.2
29.0
-1.1
-2.1
-0.5
-0.7
0.5
1.0
1.0
1.3
1.4
-64
dBmV
dB
dBc
µs
µs
mVp-p
kΩ
dB
dB
dB
+0.2
+0.3
TYP
31.1
28.3
20.9
10.9
0.5
-9.3
-19.1
-25.7
MAX
32.6
29.8
22.3
12.1
1.7
-8.1
-17.8
-24.2
dB
UNITS
MAX3507
Voltage Gain (A
V
)
Gain Flatness
dB
_______________________________________________________________________________________
3
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
MAX3507
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX3507 EV Kit, V
CC
= +4.75V to +5.25V, V
GND
= 0, V
TXEN
= V
SHDN
= V
CC
, V
IN
= +34dBmV differential, T
A
= -40°C to +85°C,
unless otherwise specified. A 4:1 impedance ratio (300Ω to 75Ω) balun is connected to differential output ports and balun output is
terminated into a 75Ω load. Typical parameters are at V
CC
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
Input tones at 42MHz and 42.2MHz, both at +31dBmV,
V
OUT
= +58dBmV/tone
Input tones at 65MHz and 65.2MHz, both at +31dBmV,
V
OUT
= +58dBmV/tone
f
IN
= 33MHz, V
OUT
= +63dBmV
2
ND
MIN
TYP
-55.4
MAX
UNITS
Two-Tone Third-Order Distortion
dBc
-47.6
-58
-56
-61
-53
-58
-57
22
-0.1
-1.3
36
47
dBm
dB
degrees
dBc
-51
dBc
-50
dBc
Harmonic Distortion
f
IN
= 33MHz, V
OUT
= +60dBmV, T
A
= 0°C to +85°C
f
IN
= 65MHz, V
OUT
= +60dBmV
f
IN
= 22MHz, V
OUT
= +63dBmV
3
RD
Harmonic Distortion
f
IN
= 22MHz, V
OUT
= +60dBmV
f
IN
= 65MHz, V
OUT
= +60dBmV
Gain = 26dB, f
IN
= 65MHz
Gain = 28dB, V
IN
= +34dBmV to +38dBmV, f
IN
= 65MHz
Gain = 28dB, V
IN
= +34dBmV to +38dBmV, f
IN
= 65MHz
Referenced to 65MHz
1dB Compression Point
AM to AM
AM to PM
Rejection at 135MHz
TIMING CHARACTERISTICS
(MAX3507 EV Kit, V
CC
= +4.75V to +5.25V, V
GND
= 0, V
TXEN
= V
SHDN
= V
CC
, T
A
= +25°C, unless otherwise specified.) (Note 3)
PARAMETER
SEN to SCLK Rise Set Time
SEN to SCLK Rise Hold Time
SDA to SCLK Setup Time
SDA to SCLK Hold Time
SDA Pulse-Width High
SDA Pulse-Width Low
SCLK Pulse-Width High
SCLK Pulse-Width Low
SYMBOL
t
SENS
t
SENH
t
SDAS
t
SDAH
t
DATAH
t
DATAL
t
SCLKH
t
SCLKL
CONDITIONS
MIN
20
10
10
20
50
50
50
50
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Guaranteed by design and characterization to ±3 sigma for T
A
< +25°C, unless otherwise specified.
AC gain correlated to DC gain measurements to ±3 sigma.
Guaranteed by design and characterization to ±6 sigma.
All transients comply with DOCSIS 1.1 limits for transmit power ripple of ±0.1dB.
Does not include output matching; see
Output Match
in the
Applications
section.
4
_______________________________________________________________________________________
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
Typical Operating Characteristics
(MAX3507 EV Kit, V
CC
= +5.0V, V
IN
= +34dBmV, TXEN =
SHDN
= V
CC
, f
IN
= 20MHz, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX3507 toc01
MAX3507
SUPPLY CURRENT IN HIGH-POWER MODE
vs. OUTPUT POWER
MAX3507 toc02
SUPPLY CURRENT IN LOW-NOISE MODE
vs. OUTPUT POWER
NO AC SIGNALS APPLIED
T
A
= +85°C
SUPPLY CURRENT (mA)
100
90
80
70
60
T
A
= +25°C
110
MAX3507 toc03
250
250
230
210
SUPPLY CURRENT (mA)
190
170
150
130
110
90
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
NO AC SIGNALS
APPLIED
NO AC SIGNALS
APPLIED
HP MODE, GC = 127
120
200
SUPPLY CURRENT (mA)
150
100
LN MODE, GC = 80
50
TXEN = GND
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
70
50
30
40
50
P
OUT
(dBmV)
50
40
70
0
10
20
30
P
OUT
(dBmV)
T
A
= -40°C
60
40
50
60
VOLTAGE GAIN IN HIGH-POWER MODE
vs. TEMPERATURE
MAX3507 toc04
VOLTAGE GAIN IN LOW-NOISE MODE
vs. TEMPERATURE
MAX3507 toc05
VOLTAGE GAIN IN HIGH-POWER MODE
vs. FREQUENCY
GC = 127
GC = 119
GC = 99
GC = 79
GC = 59
-14
-34
-54
MAX3507 toc06
32.2
32.1
32.0
VOLTAGE GAIN (dB)
31.9
31.8
31.7
31.6
31.5
31.4
31.3
31.2
-40
-15
10
35
TEMPERATURE (°C)
GC = 127
60
V
CC
= +4.7V
V
CC
= +5.3V
V
CC
= +5.0V
-5.4
-5.6
-5.8
VOLTAGE GAIN (dB)
46
26
VOLTAGE GAIN (dB)
6
-6.0
-6.2
-6.4
-6.6
-6.8
-7.0
-40
-15
10
35
TEMPERATURE (°C)
GC = 80
60
85
V
CC
= 4.7V,
5.0V, 5.3V
-74
1
10
100
1000
INPUT FREQUENCY (MHz)
85
VOLTAGE GAIN IN LOW-NOISE MODE
vs. FREQUENCY
MAX3507 toc07
VOLTAGE GAIN vs. GAIN CODE
MAX3507 toc08
GAIN STEP IN HIGH-POWER MODE
vs. GAIN CODE
0.9
0.8
GAIN STEP (dB)
0.7
0.6
0.5
0.4
0.3
0.2
MAX3507 toc09
26
6
VOLTAGE GAIN (dB)
-14
-34
-54
-74
-94
1
10
100
GC = 110
GC = 90
GC = 70
GC = 50
36
26
HIGH-POWER MODE
VOLTAGE GAIN (dB)
16
6
-4
-14
-24
-34
LOW-NOISE MODE
1.0
0.1
0
20
40
60
80
GAIN CODE
100
120
140
60
70
80
90
100
110
120
130
GAIN CODE
1000
INPUT FREQUENCY (MHz)
_______________________________________________________________________________________
5
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