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参数资料
| 型号： | MAX2021ETX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC MOD/DEMOD 36-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 调制器/解调器 |
| 频率： | 750MHz ~ 1.2GHz |
| RF 型： | GSM，EDGE，CDMA |
| 次要属性： | 升/降频器 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX2021
High-Dynamic-Range, Direct Up-/Downconversion
650MHz to 1200MHz Quadrature Mod/Demod
50 I
I
12
DAC
50 I
MAX2021
MAX5873
31dB
17dB
31dB
DUAL DAC
0
90
C
RFOUT
50 I
MAX2058
RF DIGITAL VGA
Q
12
DAC
SPI
LOGIC
50 I
LOOPBACK
OUT
Rx OFF
SPI
CONTROL
MAX9491
VCO + SYNTH
45, 80,
OR
(FEEDS BACK
INTO Rx CHAIN
FRONT END)
95MHz
LO
Figure 1. Transmitter Lineup
C = 6.8pF
The I/Q input power levels and the insertion loss of the
device determine the RF output power level. The input
power is a function of the delivered input I and Q volt-
100 ?
MAX2021
RF-MODULATOR
ages to the internal 50 ? termination. For simple sinu-
soidal baseband signals, a level of 89mV P-P differential
I
L = 40nH
100 ?
on the I and the Q inputs results in a -17dBm input
power level delivered to the I and Q internal 50 ? termi-
nations. This results in an RF output power of -23.2dBm.
External Diplexer
LO leakage at the RF port can be nulled to a level less
C = 6.8pF
LO
0 °
90 °
∑
RF
than -80dBm by introducing DC offsets at the I and Q
ports. However, this null at the RF port can be compro-
mised by an improperly terminated I/Q IF interface. Care
100 ?
must be taken to match the I/Q ports to the driving DAC
circuitry. Without matching, the LO’s second-order (2f LO )
Q
L = 40nH
100 ?
term may leak back into the modulator’s I/Q input port
where it can mix with the internal LO signal to produce
additional LO leakage at the RF output. This leakage
effectively counteracts against the LO nulling. In addi-
tion, the LO signal reflected at the I/Q IF port produces a
C = 6.8pF
Figure 2. Diplexer Network Recommended for GSM 900
Transmitter Applications
Maxim Integrated
residual DC term that can disturb the nulling condition.
As demonstrated in Figure 2, providing an RC termina-
tion on each of the I+, I-, Q+, Q- ports reduces the
amount of LO leakage present at the RF port under
13
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PDF描述 |
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| MAX2023ETX+T | IC MOD/DEMOD HI DYN RNG 36-TQFN |
| MAX2027EUP+D | IC AMP VAR GAIN 20-TSSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2021EVKIT | 功能描述:射频开发工具 RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX2022 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Dynamic-Range, Direct Upconversion 1500MHz to 2500MHz Quadrature Modulator |
| MAX20-22.0C | 制造商:MDE 制造商全称:MDE Semiconductor, Inc. 功能描述:HIGH CURRENT TRANSIENT VOLTAGE SUPPRESSOR (TVS) DIODE |
| MAX20-22.0CA | 制造商:MDE 制造商全称:MDE Semiconductor, Inc. 功能描述:HIGH CURRENT TRANSIENT VOLTAGE SUPPRESSOR (TVS) DIODE |
| MAX2022_1 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit |
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