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PDF MAX3507 Data sheet ( Hoja de datos )
| Número de pieza | MAX3507 | |
| Descripción | Upstream CATV Amplifier with On-Chip Anti-Alias Filter | |
| Fabricantes | Maxim Integrated | |
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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).
Applications
Cable Modem Upstream Transmitter
Set-Top Box Upstream Transmitter
Telephony Over Cable
Features
o Built-In 5th-Order Elliptic Anti-Aliasing Filter
o 5MHz to 65MHz Operation
o 55dB Gain Control Range
o Optional Positive Slope Generator
o 55dB Spurious-Free Dynamic Range Over
Transmit Band
PART
MAX3507EGI
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QFN
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VCC VCC
28 27 26 25 24 23 22
BIASF 1
21 TXEN
DC+
2
BIAS
CIRCUIT
20 N.C.
VCC
DC-
3
GND 4
VCC
VCC
5
IN+ 6
OPTIONAL
EQUALIZER
5-POLE
ELLIPTIC
FILTER
SERIAL DATA
GAIN
CONTROL
OUT+
19
18 OUT-
17 N.C.
CEXT
16
4:1
IMPEDANCE
RATIO
IN-
7
MAX3507
15 N.C.
8 9 10 11 12 13 14
VCC
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.
1 page  
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
Typical Operating Characteristics
(MAX3507 EV Kit, VCC = +5.0V, VIN = +34dBmV, TXEN = SHDN = VCC, fIN = 20MHz, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
250
NO AC SIGNALS
APPLIED
200
HP MODE, GC = 127
150
100 LN MODE, GC = 80
50
0
-40
TXEN = GND
-15 10 35 60
TEMPERATURE (°C)
85
SUPPLY CURRENT IN HIGH-POWER MODE
vs. OUTPUT POWER
250
230
NO AC SIGNALS
APPLIED
210
190
TA = +85°C
170
150
130 TA = +25°C
110
90
70 TA = -40°C
50
30
40 50 60
POUT (dBmV)
70
SUPPLY CURRENT IN LOW-NOISE MODE
vs. OUTPUT POWER
120
NO AC SIGNALS APPLIED
110
TA = +85°C
100
90
80 TA = +25°C
70
60
50 TA = -40°C
40
0
10 20 30 40 50 60
POUT (dBmV)
VOLTAGE GAIN IN HIGH-POWER MODE
vs. TEMPERATURE
32.2
32.1
32.0
31.9
31.8 VCC = +5.3V
VCC = +5.0V
31.7
31.6 VCC = +4.7V
31.5
31.4
31.3
31.2
-40
GC = 127
-15 10 35 60
TEMPERATURE (°C)
85
VOLTAGE GAIN IN LOW-NOISE MODE
vs. TEMPERATURE
-5.4
-5.6
-5.8
-6.0
-6.2
-6.4 VCC = 4.7V,
5.0V, 5.3V
-6.6
-6.8
-7.0
-40
GC = 80
-15 10 35 60
TEMPERATURE (°C)
85
VOLTAGE GAIN IN HIGH-POWER MODE
vs. FREQUENCY
46
GC = 127
26 GC = 119
GC = 99
6 GC = 79
GC = 59
-14
-34
-54
-74
1
10 100
INPUT FREQUENCY (MHz)
1000
VOLTAGE GAIN IN LOW-NOISE MODE
vs. FREQUENCY
26
6 GC = 110
GC = 90
-14 GC = 70
GC = 50
-34
-54
-74
-94
1
10 100
INPUT FREQUENCY (MHz)
1000
VOLTAGE GAIN vs. GAIN CODE
36
26
HIGH-POWER MODE
16
6
-4
-14 LOW-NOISE MODE
-24
-34
20 40 60 80 100 120 140
GAIN CODE
GAIN STEP IN HIGH-POWER MODE
vs. GAIN CODE
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
60 70 80 90 100 110 120 130
GAIN CODE
_______________________________________________________________________________________ 5
5 Page 
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
Package Information
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3507.PDF ] | |
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