MAX2055EUP+D Maxim Integrated Products, MAX2055EUP+D Datasheet - Page 10

• 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

Digitally Controlled, Variable-Gain, Differential
ADC Driver/Amplifier
The MAX2055 is a high-dynamic-range, digitally con-
trolled, variable-gain differential ADC driver/amplifier
(DVGA) for use in applications from 30MHz to 300MHz.
The amplifier is designed for 50Ω single-ended input
and 50Ω differential output systems.
The MAX2055 integrates a digital attenuator with a
23dB selectable attenuation range and a high-linearity,
single-ended-to-differential output amplifier. The attenu-
ator is digitally controlled through five logic lines:
B0–B4. The on-chip attenuator provides up to 23dB of
attenuation with ±0.2dB accuracy. The single-ended
input to differential output amplifier utilizes negative
Figure 1. Typical Application Circuit
10
______________________________________________________________________________________
CONTROL
INPUTS
V
CC
C3
Detailed Description
C2
R7
V
CC
RF_IN
C12
C1
C11
C8
10
1
2
3
4
5
6
7
9
8
RF_OUT-
V
RF_IN
GND
B4
B3
B2
B1
B0
V
CC
CC
L5
ATTENUATION
CONTROL
MAX2055
LOGIC
1
V
CC
C10
feedback to achieve high gain and linearity over a wide
bandwidth.
The digital attenuator is controlled through five logic
lines: B0, B1, B2, B3, and B4. Table 3 lists the attenua-
tion settings. The input and output of this attenuator
require external DC blocking capacitors. The attenua-
tor’s insertion loss is approximately 2dB, when the con-
trol bits are set to 0dB (B0 = B1 = B2 = B3 = B4 = 0).
The MAX2055 integrates a single-ended-to-differential
amplifier with a nominal gain of 22dB in a negative
RF_OUT
T2
L4
RF_OUT+
ATTN
AMP
GND
GND
I
BIAS
I
C
OUT
Single-Ended-to-Differential Amplifier
SET
C
L
BP
IN
C
E
20
19
18
17
16
14
13
12
15
11
C9
Applications Information
Digitally Controlled Attenuator
L2
R1
L3
C5
C4
L1
1
C6
T1