LTC6431-20
8
643120f
For more information www.linear.com/LTC6431-20
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
Output Power vs Input Power
Over Frequency
Gain vs Output Power
Over Frequency P1dB vs Frequency
T
A
= 25°C, V
CC
= 5V, Z
SOURCE
= Z
LOAD
= 50Ω unless
otherwise noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω without de-embedding (Note 4).
INPUT POWER (dBm)
–10
OUTPUT POWER (dBm)
16
18
20
6
643120 G19
14
12
8
–6
–2
2
–8 8
–4
0
4
10
24
22
50MHz
100MHz
200MHz
300MHz
400MHz
500MHz
600MHz
700MHz
800MHz
900MHz
1000MHz
OUTPUT POWER (dBm)
10
19
20
22
16 20
18
17
12 14
18 22 24
16
15
21
GAIN (dB)
50MHz
100MHz
200MHz
300MHz
400MHz
500MHz
600MHz
700MHz
800MHz
900MHz
1000MHz
FREQUENCY (MHz)
0
P1dB (dBm)
21
23
25
800
643120 G21
19
17
20
22
24
18
16
15
200
400
600
1000
DNC (Pins 1 to 7, 10 to 15, 19 to 21): Do Not Connect.
Do not connect these pins, allow them to float. Failure to
float these pins may impair operation of the LTC6431-20.
GND (Pins 8, 17, 23, Exposed Pad Pin 25): Ground.
For best RF performance, all ground pins should be
connected to the printed circuit board ground plane. The
exposed pad (Pin 25) should have multiple via holes to
an underlying ground plane for low inductance and good
thermal dissipation.
V
CC
(Pins 9, 22): Positive Power Supply. Either or both
V
CC
pins should be connected to the 5.0V supply. Bypass
the V
CC
pin with 1000pF and 0.1µF capacitors. The 1000pF
capacitor should be physically close to Pin 22.
T_DIODE (Pin 16): Optional Diode. The T_DIODE can
be forward biased to ground with 1mA of current. The
measured voltage will be an indicator of chip temperature.
Out (Pin 18): Amplifier Output Pin. A choke inductor is
necessary to provide power from the 5V supply and to
provide RF isolation. For best performance select a choke
with low loss and high self-resonant frequency (SRF). A
DC blocking capacitor is also required. See Applications
Information Section for specific recommendations.
IN (Pin 24): Signal input pin with internally generated 2.0V
DC bias. A DC blocking capacitor is required. See Applica-
tions
Information
Section for specific recommendations.
