Rainbow Electronics MAX2057 - Manual (Page 10)

MAX2057
1700MHz to 2500MHz Variable-Gain
Amplifier with Analog Gain Control
10 ______________________________________________________________________________________
Detailed Description
The MAX2057 general-purpose, high-performance VGA
with analog gain control is designed to interface with
50
Ω systems operating in the 1700MHz to 2500MHz
frequency range.
The MAX2057 integrates two attenuators to provide
21dB or 42dB of precision analog gain control, as well
as a two-stage amplifier that has been optimized to
provide high gain, high IP3, low noise figure, and low
power consumption. The bias current of each amplifier
stage can be adjusted by individual external resistors
to further reduce power consumption for applications
that do not require high linearity.
MAX2057
27
26
25
24
23
32 31 30 29 28
GND
V GC
GND
GND
GND
OUT
GND
GND
GND
GND
GND
GND
GND
OUT_A
GND
IN_A
C4
C6
C10
C13
C5
RF
OUTPUT
R1
R2
C2
C1
C15 C9
C3
V CC
V CC
V CC
C14 C8
V CC
RF INPUT*
*NOTE: CONNECT THE INPUT ACCORDING TO THE SOLID BOLD LINE IF ONE ATTENUATOR
IS USED. CONNECT THE INPUT ACCORDING TO THE BROKEN LINE IF TWO ATTENUATORS ARE USED.
V
CC
V
CC
GND GND IN GND GND V
CC
GND GND ATTN_OUT
AMP_IN
GND
36 35 34 33
14 15 16 17 18 10 11 12 13
22
20
21
19
5
4
3
2
9
8
7
6
1
+
-
ATTENUATION
CONTROL
CIRCUITRY
V
CC
V
CNTL GND V
CC
GND
R
SET1 V
CC
R
SET2 GND
C17 0.06in LONG FR4 50 Ω
TRANSMISSION LINE
EP
C7
Figure 1. Typical Application Circuit