max2645eubt Maxim Integrated Products, Inc., max2645eubt Datasheet - Page 8

• Manufacturer Part Number: max2645eubt
• Description: Max2645 3.4ghz To 3.8ghz Sige Low-noise Amplifier/pa Predriver
• Manufacturer: Maxim Integrated Products, Inc.

13
12
11
10
3.4GHz to 3.8GHz SiGe
Low-Noise Amplifier/PA Predriver
(MAX2645 EV kit, V
8
9
8
7
OUTPUT P1dB POINT vs. SUPPLY VOLTAGE
3.0
1, 2, 4, 7,
V
PA PREDRIVER CIRCUIT
T
_______________________________________________________________________________________
CC
A
PIN
EP
T
10
= +85 C
3
5
6
8
9
= 5V
A
= -40 C
3.5
(HIGH-GAIN MODE)
SUPPLY VOLTAGE (V)
T
4.0
A
= +25 C
RFOUT
NAME
SHDN
GAIN
CC
GND
RFIN
BIAS
V
CC
4.5
= +3.3V, R
5.0
Shutdown Control Logic-Level Input. A logic high enables the device for normal operation. A logic
low places the device in low-power shutdown mode.
Ground. Connect to ground plane with a low-inductance connection. Solder exposed paddle evenly
to the board ground plane.
RF Input Port to Amplifier. Requires a matching network and a DC-blocking capacitor that may be
part of this network. See Figure 1 for recommended component values.
Bias-Setting Resistor Connection. A resistor, R
and supply current of the amplifier.
RF Open-Collector Output Port of Amplifier. Requires a matching network composed of an
inductance to V
values.
Gain Control Logic-Level Input. A logic high places the device in high-gain mode. A logic low
places the device in low-gain mode, reducing the gain by 25dB.
Power Supply Input. Bypass directly to ground with a capacitor as close to the supply pin as
possible. See Figure 1 for recommended component values.
BIAS
5.5
= 20k , f
RFIN
-10
-15
-20
-25
10
CC
Typical Operating Characteristics (continued)
-5
5
0
-10.0
and a DC-blocking capacitor. See Figure 1 for recommended component
V
PA PREDRIVER CIRCUIT
= 3550MHz, T
CC
OUTPUT POWER vs. INPUT POWER
= 5V
(LOW-GAIN MODE)
T
-5.0
INPUT POWER (dBm)
A
= +25°C
A
T
A
= +25°C, unless otherwise noted.)
= -40°C
T
A
= +85°C
0
FUNCTION
BIAS
, placed from BIAS to ground sets the linearity
5.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
3.4
V
PA PREDRIVER CIRCUIT
CC
= 5V
INPUT VSWR vs. FREQUENCY
3.5
Pin Description
FREQUENCY (GHz)
LOW GAIN
3.6
HIGH GAIN
3.7
3.8