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參數(shù)資料
| 型號： | MAX2022 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Dynamic-Range, Direct Upconversion 1500MHz to 2500MHz Quadrature Modulator |
| 中文描述： | 高動態(tài)范圍、直接變換，提供1500MHz至2500MHz正交調(diào)制器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 293K |
| 代理商： | MAX2022 |
M
up to 2V
P-P
differential (common-mode input equals 0V).
The wide input bandwidth allows for direct interface with
the baseband DACs. No active buffer circuitry between
the baseband DAC and the MAX2022 is required.
The I and Q signals directly modulate the 0
°
and 90
°
LO signals and are upconverted to the RF frequency.
The outputs of the I and Q mixers are combined
through a balun to a singled-ended RF output.
Applications Information
LO Input Drive
The LO input of the MAX2022 requires a single-ended
drive at a 1500MHz to 2500MHz frequency. It is inter-
nally matched to 50
. An integrated balun converts the
singled-ended input signal to a differential signal at the
LO buffer differential input. An external DC-blocking
capacitor is the only external part required at this inter-
face. The LO input power should be within the -3dBm
to +3dBm range.
COMP Pin
The COMP pin is used to provide additional lowpass fil-
tering to the bias circuit noise. An external capacitor
can be used from the COMP pin to ground to reduce
the close-in noise of the modulator. For UMTS, connect-
ing a 22pF capacitor from the COMP pin to ground is
recommended to filter out noise and frequency offsets
above 3.5MHz. For GSM, connecting a 1nF capacitor
from COMP to ground is recommended for filtering out
noise and frequency offsets above 600kHz.
Baseband I/Q Input Drive
The MAX2022 I and Q baseband inputs should be dri-
ven differentially for best performance. The baseband
inputs have a 50
differential input impedance. The
optimum source impedance for the I and Q inputs is
100
differential. This source impedance will achieve
the optimal signal transfer to the I and Q inputs, and the
optimum output RF impedance match. The MAX2022
can accept input power levels of up to +12dBm on the I
and Q inputs. Operation with complex waveforms, such
as CDMA or WCDMA carriers, utilize input power levels
that are far lower. This lower power operation is made
necessary by the high peak-to-average ratios of these
complex waveforms. The peak signals must be kept
below the compression level of the MAX2022. The input
common-mode voltage should be confined to the -2V to
+1.5V DC range.
The MAX2022 is designed to interface directly with
Maxim high-speed DACs. This generates an ideal total
transmitter lineup, with minimal ancillary circuit elements.
Such DACs include the MAX5875 series of dual DACs,
and the MAX5895 dual interpolating DAC. These DACs
have ground-referenced differential current outputs.
Typical termination of each DAC output into a 50
load
High-Dynamic-Range, Direct Upconversion
1500MHz to 2500MHz Quadrature Modulator
10
______________________________________________________________________________________
MAX5895
DUAL 16-BIT INTERP DAC
MAX2022
RF MODULATOR
I/Q GAIN AND
OFFSET ADJUST
BBI
LO
BBQ
FREQ
50
50
50
FREQ
50
50
50
50
0
°
90
°
∑
Figure 1. MAX5895 DAC Interfaced with MAX2022
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX20-22.0C | 制造商:MDE 制造商全稱:MDE Semiconductor, Inc. 功能描述:HIGH CURRENT TRANSIENT VOLTAGE SUPPRESSOR (TVS) DIODE |
| MAX20-22.0CA | 制造商:MDE 制造商全稱:MDE Semiconductor, Inc. 功能描述:HIGH CURRENT TRANSIENT VOLTAGE SUPPRESSOR (TVS) DIODE |
| MAX2022_1 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Evaluation Kit |
| MAX2022_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:High-Dynamic-Range, Direct Up/ Downconversion 1500MHz to 3000MHz Quadrature Modulator/Demodulator |
| MAX2022ETX | 功能描述:調(diào)節(jié)器/解調(diào)器 1.5GHz-2.5GHz Quad Mod/Demod RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
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