MAX2055EUP+D Maxim Integrated Products, MAX2055EUP+D Datasheet - Page 11

• Manufacturer Part Number: MAX2055EUP+D
• Description: RF Mixer IC ADC DRVR/AMP VAR GAIN
• Manufacturer: Maxim Integrated Products

Specifications of MAX2055EUP+D

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

feedback topology. This amplifier is optimized for a fre-
quency range of operation from 30MHz to 300MHz with
a high-output third-order intercept point (OIP3). The
bias current is chosen to optimize the IP3 of the amplifi-
er. When R1 is 1.13kΩ (909Ω if using the circuit of
Figure 2), the current consumption is 240mA while
exhibiting a 40dBm typical output IP3 at 70MHz. The
common-mode inductor, L2, provides a high common-
mode rejection with excellent amplitude and phase bal-
ance at the output. L2 must handle the supply current
and have DC resistance less than 0.2Ω.
Figure 2. Low-Cost Application Circuit
Digitally Controlled, Variable-Gain, Differential
CONTROL
INPUTS
______________________________________________________________________________________
V
CC
C3
C2
R7
V
CC
RF_IN
C12
C11
C1
C8
10
1
2
3
4
5
6
7
8
9
GND
RF_OUT-
V
RF_IN
B4
B3
B2
B1
B0
V
CC
CC
L5
ATTENUATION
CONTROL
MAX2055
LOGIC
1
The single-ended amplifier input and differential output
ports require external choke inductors. At the input,
connect a 330nH bias inductor from AMP
I
RF_OUT+ (pin 11) and RF_OUT- (pin 10) to V
connections provide bias current to the amplifier.
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and induc-
tance. For best performance, route the ground-pin
traces directly to the exposed pad underneath the
BIAS
V
CC
C10
RF_OUT
ADC Driver/Amplifier
(pin 12). Connect 680nH choke inductors from
T2
L4
RF_OUT+
ATTN
AMP
GND
GND
I
BIAS
I
C
OUT
SET
C
BP
L
IN
C
E
20
19
18
17
16
15
14
13
12
11
C9
L2
R1
Layout Considerations
L3
C7
C5
Choke Inductor
L1
C4
IN
(pin 15) to
CC
. These
11