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参数资料
| 型号： | MAX2021ETX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/20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
varying temperature, LO frequency, and baseband
drive conditions. See the Typical Operating
Characteristics for details. Note that the resistor value is
chosen to be 100 ? with a corner frequency 1 / (2 π RC)
selected to adequately filter the f LO and 2f LO leakage,
yet not affecting the flatness of the baseband response
at the highest baseband frequency. The common-
mode f LO and 2f LO signals at I+/I- and Q+/Q- effective-
ly see the RC networks and thus become terminated in
50 ? (R/2). The RC network provides a path for absorb-
ing the 2f LO and f LO leakage, while the inductor pro-
vides high impedance at f LO and 2f LO to help the
diplexing process.
RF Demodulator
The MAX2021 can also be used as an RF demodulator
(see Figure 3), downconverting an RF input signal
directly to baseband. The single-ended RF input
accepts signals from 650MHz to 1200MHz with power
levels up to +30dBm. The passive mixer architecture
produces a conversion loss of typically 9.2dB. The
downconverter is optimized for high linearity and
excellent noise performance, typically with a
+35.2dBm IIP3, a P1dB of greater than +30dBm, and a
9.3dB noise figure.
A wide I/Q port bandwidth allows the port to be used as
an image-reject mixer for downconversion to a quadra-
ture IF frequency.
The RF and LO inputs are internally matched to 50 ? .
Thus, no matching components are required, and only
DC-blocking capacitors are needed for interfacing.
Demodulator Output Port Considerations
Much like in the modulator case, the four baseband
ports require some form of DC return to establish a com-
mon mode that the on-chip circuitry drives. This can be
achieved by directly DC-coupling to the baseband ports
(staying within the ±3.5V common-mode range),
through an inductor to ground, or through a low-value
resistor to ground. Figure 4 shows a typical network that
would be used to connect to each baseband port for
demodulator operation. This network provides a com-
mon-mode DC return, implements a high-frequency
diplexer to terminate unwanted RF terms, and also pro-
vides an impedance transformation to a possible higher
impedance baseband amplifier.
The network C a , R a , L a and C b form a highpass/low-
pass network to terminate the high frequencies into a
load while passing the desired lower IF frequencies.
Elements L a , C b , L b , C c , L c , and C d provide a possible
impedance transformer. Depending on the impedance
being transformed and the desired bandwidth, a fewer
number of elements could be used. It is suggested that
L a and C b always be used since they are part of the
high frequency diplexer. If power matching is not a
concern then this would reduce the elements to just the
diplexer.
Resistor R b provides a DC return to set the common
mode voltage. In this case, due to the on-chip circuitry,
the voltage would be approx 0V DC. It can also be
used to reduce the load impedance of the next stage.
Inductor L d can provide a bit of high frequency gain
peaking for wideband IF systems. Capacitor C e is a DC
block.
Typical values for C a , R a , L a , and C b would be 1.5pF,
50 ? , 11nH, and 4.7pF, respectively. These values can
change depending on the LO, RF, and IF frequencies
used. Resistor R b is in the 50 ? to 200 ? range
The circuitry presented in Figure 4 does not allow for LO
leakage at RF port nulling. Depending on the LO at RF
leakage requirement, a trim voltage might need to be
introduced on the baseband ports to null the LO leakage.
MAX2021
DIPLEXER/
DC RETURN
MATCHING
ADC
RF
90
0
LO
DIPLEXER/
DC RETURN
MATCHING
ADC
Figure 3. MAX2021 Demodulator Configuration
14
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| MAX2022ETX+T | IC MOD 1500MHZ TO 2500MHZ 36TQFN |
| MAX2022EVKIT | EVAL KIT FOR MAX2022 |
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| MAX2027EUP+D | IC AMP VAR GAIN 20-TSSOP |
| MAX2027EVKIT | EVAL KIT FOR MAX2027 |
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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