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PDF MAX3509EUP Data sheet ( Hoja de datos )
| Número de pieza | MAX3509EUP | |
| Descripción | Upstream CATV Amplifier | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1700; Rev 0; 4/00
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Upstream CATV Amplifier
General Description
The MAX3509 is a programmable power amplifier for
use in CATV upstream applications. The device outputs
up to 66dBmV QPSK through a 1:1 transformer. It fea-
tures variable gain controlled by a 3-wire digital serial
bus. Gain control is available in 1dB steps. The device
operates over a 5MHz to 65MHz frequency range.
The MAX3509 offers a transmit-disable mode, which
places the device in a high-isolation state for use
between bursts in TDMA systems. In this mode, all ana-
log functions are shut down, minimizing output noise
and power consumption. When entering and leaving
transmit-disable mode, transients are kept to 25mV
nominal at full gain. In addition, supply current is re-
duced to 7.8mA.
An additional power-down mode is available. Shutdown
mode disables all circuitry and reduces current con-
sumption to less than 1µA.
The MAX3509 is available in a 20-pin TSSOP-EP pack-
age for the extended-industrial temperature range
(-40°C to +85°C).
Applications
Telephony over Cable CATV Status Monitor
OPENCATV Set-Top Box CATV Infrastructure
Cable Modems
Typical Operating Circuit
Features
o Ultra-Low Power-Up/Down Transients,
25mV (typ) at 66dBmV Output
o Single-Supply Operation
o Output Level Ranges from <12dBmV to 67dBmV
(QPSK)
o Gain Programmable in 1dB Steps
o Low Transmit Output Noise Floor: -41dBmV
(160kHz BW)
o Low Transmit-Disable Output Noise: -70dBmV
o Shutdown Mode
PART
MAX3509EUP
*Exposed paddle
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 TSSOP-EP*
Pin Configuration
+9V
0.1µF
3 VCC1
4
GND1
VCC2 17
+9V
0.1µF
1000pF 5 IN+
MAX3509
4700pF
OUT+ 16
OUT
IN
1000pF 6
IN-
4700pF
OUT- 15
T1
1:1
+9V
0.1µF
LOGIC
INPUTS
8 VCC1
7 GND1
2 SHDN
1 TXEN
20 SCLK
19 SDA
18 CS
VCC2 14
+9V
0.1µF
GND2 *
GND 9
GND 10
GND 11
GND 12
GND 13
TOP VIEW
TXEN 1
20 SCLK
SHDN 2
19 SDA
VCC1 3
GND1 4
IN+ 5
MAX3509
18 CS
17 VCC2
16 OUT+
IN- 6
15 OUT-
GND1 7
VCC1 8
14 VCC2
13 GND
GND 9
12 GND
GND 10
11 GND
EXPOSED PADDLE
TSSOP-EP
*EXPOSED PADDLE
†Covered by U.S. Patent numbers 5,748,027 and 5,994,955.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Upstream CATV Amplifier
Typical Operating Characteristics (continued)
(MAX3509 EV kit, VCC1 = VCC2 = +9V, VIN = +34dBmV, TXEN = SHDN = high, D7 = 1, fINPUT = 10MHz, ZLOAD = 75Ω through a 1:1
transformer, TA = +25°C, unless otherwise noted.)
VOLTAGE GAIN vs. FREQUENCY
50
40 A
B
30
C
20
10 D
0E
-10 F
G
-20
-30
GAIN CONTROL WORD
A = 63, B = 57, C = 48,
-40 D = 36, E = 24, F = 12,
G=6
-50
5 10
100
FREQUENCY (MHz)
500
40
30
20
10
0
-10
-20
-30
0
VOLTAGE GAIN
vs. CONTROL WORD
10MHz
60MHz
10 20 30 40 50
CONTROL WORD (DECIMAL)
60
GAIN STEP
vs. CONTROL WORD
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0
10 20 30 40 50
CONTROL WORD (DECIMAL)
60
TRANSMIT OUTPUT NOISE vs. GAIN
-20
-22
-24
-26
-28
-30
-32
-34
-36
-38
-40
-42
-24 -14 -4 6 16 26 36
GAIN (dB)
POWER-UP/DOWN TRANSIENTS
vs. CONTROL WORD
100
10
1
0
10 20 30 40 50 60 70
CONTROL WORD
2ND HARMONIC DISTORTION
vs. INPUT FREQUENCY
-58
66dBmV
-62 60dBmV
-66
-70
-74
0
10 20 30 40 50 60 70
FREQUENCY (MHz)
2ND HARMONIC DISTORTION
vs. INPUT FREQUENCY
-50
-55
10dBmV
-60
30dBmV
-65
-70
-75
-80
0
10 20 30 40 50 60 70
FREQUENCY (MHz)
3RD HARMONIC DISTORTION vs.
INPUT FREQUENCY AND OUTPUT POWER
-40
-45 66dBmV
-50 60dBmV
-55
-60
30dBmV
-65
-70
10dBmV
-75
-80
-85
-90
0 10 20 30 40 50 60 70
FREQUENCY (MHz)
QPSK OUTPUT SPECTRUM
-10
-20
VOUT = 66dBmV
1280 ks/s
-30 α = 0.25
-40
-50
-60
-70
-80
-90
-100
CENTER 22MHz
-110
500kHz/div
SPAN 5MHz
____________________________________________________________________________________ 5
5 Page 
Upstream CATV Amplifier
NOTES
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3509EUP.PDF ] | |
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