MAX3514 Datasheet, PDF (15/21 Pages) Maxim Integrated Products – Upstream CATV Amplifiers

Upstream CATV Amplifiers
PIN
1, 3, 7, 11
2
4
5
6
8
9
10
12
13, 17
14
15
16
18
19
20
Exposed
Paddle
NAME
GND
V_CC
GND
IN+
IN-
CS
SDA
SCLK
SHDN
N.C.
CEXT
OUT-
OUT+
TXEN
V_CC
GND
GND
Pin Description
Ground
FUNCTION
Programmable-Gain Amplifier (PGA) +5V Supply. Bypass to pin 4 with a decoupling capacitor as
close to the part as possible.
PGA RF Ground. As with all ground connections, maintain the shortest possible (low-inductance)
length to the ground plane.
Positive PGA Input. Along with IN-, this port forms a high-impedance differential input to the PGA.
Driving this port differentially increases the rejection of second-order distortion at low output levels.
Negative PGA Input. When not used, this port must be AC-coupled to ground. See IN+.
Serial-Interface Enable. TTL-compatible input. See Serial Interface section.
Serial-Interface Data. TTL-compatible input. See Serial Interface section.
Serial-Interface Clock. TTL-compatible input. See Serial Interface section.
Shutdown. When SHDN is set low, all functions (including the serial interface) are disabled.
No Connection
RF Output Bypass. Bypass to ground with a 0.1µF capacitor. (N.C. for MAX3517.)
Negative Output. Along with OUT+, this port forms a 300Ω impedance output. This port is matched
to a 75Ω load using a 2:1 (voltage ratio) transformer.
Positive Output. See OUT-.
Transmit Enable. Drive TXEN high to place the device in transmit-enable mode.
Output Amplifier Bias, +5V Supply. Bypass to pin 20 with a decoupling capacitor as close to the part
as possible.
Output Amplifier Bias Ground. As with all ground connections, maintain the shortest possible (low-
inductance) length to the ground plane.
Ground (MAX3516 only)
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