MAX3509 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Upstream CATV Amplifier

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
V_CC2 ¹⁷
+9V
0.1µF
1000pF _{5 IN+}
MAX3509
4700pF
OUT+ ¹⁶
OUT
IN
1000pF ₆
IN-
T1
4700pF
OUT- ¹⁵
1:1
+9V
0.1µF
LOGIC
INPUTS
8 _VCC1
7 _GND1
2 _SHDN
1 _TXEN
20 _SCLK
19 _SDA
18 _CS
V_CC2 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
V_CC1 3
GND1 4
IN+ 5
MAX3509
18 CS
17 V_CC2
16 OUT+
IN- 6
15 OUT-
GND1 7
V_CC1 8
14 V_CC2
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.}
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