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Numéro de référence | MAX3509 | ||
Description | Upstream CATV Amplifier | ||
Fabricant | Maxim Integrated | ||
Logo | |||
1 Page
19-1700; Rev 0; 4/00
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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.
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Pages | Pages 12 | ||
Télécharger | [ MAX3509 ] |
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