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Digitally Controlled, Variable-Gain, Differential
ADC Driver/Amplifier
V CC
C3
C2
C4
C6
1
V CC
GND
20
RF_IN
2 RF_IN
ATTN OUT 19
C1
3
GND
4 B4
18
GND
I SET 17
R1
C5
T1
C C
L E
CONTROL
INPUTS
5 B3
6 B2
7 B1
ATTENUATION
LOGIC
CONTROL
16
AMP IN 15
14
L2
1
8 B0
C BP 13
L1
V CC
R7
9 V
CC
MAX2055
I BIAS
12
C12
C11
10 RF_OUT-
RF_OUT+
11
L3
C8
L5
V CC
C10
L4
C9
1
T2
RF_OUT
Figure 1. Typical Application Circuit
Detailed Description
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 50 Ω single-ended input
and 50 Ω 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
feedback to achieve high gain and linearity over a wide
bandwidth.
Applications Information
Digitally Controlled Attenuator
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).
Single-Ended-to-Differential Amplifier
The MAX2055 integrates a single-ended-to-differential
amplifier with a nominal gain of 22dB in a negative
10
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MAX2055EUP-T 制造商:Maxim Integrated Products 功能描述:DIGITALLY CONTROLLED, VARIABLE-GAIN, DIFFEREN - Tape and Reel
MAX2055EUP-TD 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2055EVKIT 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2056 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit
MAX2056_1 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit
MAX2056ETX 功能描述:射频放大器 0.8GHz - 1GHz Variable-Gain Amp RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX2056ETX+ 功能描述:射频放大器 0.8GHz - 1GHz Variable-Gain Amp RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel