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參數(shù)資料
| 型號(hào)： | MAX9981 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer |
| 中文描述： | 825MHz至915MHz、雙路、SiGe高線性度有源混頻器 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大?。?/td> | 409K |
| 代理商： | MAX9981 |
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Detailed Description
The MAX9981 downconverter mixers are designed for
GSM and CDMA base-station receivers with an RF fre-
quency between 825MHz and 915MHz. Each active
mixer provides 2.1dB to 2.7dB of overall conversion
gain to the receive signal, removing the need for an
external IF amplifier. The mixers have excellent input
IP3 measuring greater than +27dBm. The device also
features integrated RF and LO baluns that allow the
mixers to be driven with single-ended signals.
RF Inputs
The MAX9981 has two RF inputs (RFMAIN, RFDIV) that are
internally matched to 50
requiring no external matching
components. A 33pF DC-blocking capacitor is required at
the input since the input is internally DC shorted to ground
through a balun. Return loss is better than 15dB over the
entire frequency range of 825MHz to 915MHz.
LO Inputs
The mixers can be used for either high-side or low-side
injection applications with an LO frequency range of
725MHz to 1085MHz. An internal LO switch allows for
switching between two single-ended LO ports. This is
useful for fast frequency changes/frequency hopping. LO
switching time is less than 250ns. The switch is controlled
by a digital input (LOSEL) that when high, selects LO1
and when low, selects LO2. The selected LO input mixes
with both RFMAIN and RFDIV to produce the IF signals.
Internal LO buffers allow for a wide power range on the
LO ports. The LO signal power can vary from -5dBm to
+5dBm. LO1 and LO2 are internally matched to 50
, so
only a 15pF DC-blocking capacitor is required at each
LO port.
IF Outputs
Each mixer has an IF frequency range of 70MHz to
170MHz. The differential IF output ports require exter-
nal pullup inductors to V
CC
to resonate out the differen-
tial on-chip capacitance of 1.8pF. See the
Typical
Application Circuit
for recommended component val-
ues for an IF of 70MHz to 100MHz. The IF match can
be optimized for higher IF frequencies by reducing the
values of the pullup inductors L1, L2, L3, and L4.
Note:
Removing the ground plane from underneath these
inductors reduces parasitic capacitive loading and
improves VSWR.
Bias Circuitry
Connect bias resistors from MAINBIAS and DIVBIAS to
ground to set the mixer bias current. A nominal resistor
value of 267
sets an input IP3 of +27dBm and supply
current of 290mA. Bias currents are fine-tuned at the
factory and should not be adjusted.
Applications Information
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and induc-
tance. For best performance, route the ground pin
traces directly to the exposed paddle underneath the
package. This paddle should be connected to the
ground plane of the board by using multiple vias under
the device to provide the best RF/thermal conduction
path. Solder the exposed paddle, on the bottom of the
device package, to a PC board exposed pad.
825MHz to 915MHz, Dual SiGe High-Linearity
Active Mixer
12
______________________________________________________________________________________
Component List
COMPONENT
C1, C4
C2, C3
C5, C6, C9, C10
C7, C8
C11, C12
C13, C16, C17, C20
C14, C15, C18, C19
L1
–
L4
R1, R2
R3
–
R6
T1, T2
VALUE
33pF
3.9pF
100pF
15pF
0.033μF
220pF
330pF
560nH
267
±1%
137
±1%
4:1 (200:50)
SIZE
0603
0603
0603
0603
0603
0603
0603
1008
0603
0603
—
PART NUMBER
Murata GRM1885C1H330J
Murata GRM1885C1H3R9C
Murata GRM1885C1H101J
Murata GRM1885C1H150J
Murata GRM188R71E333K
Murata GRM1885C1H221J
Murata GRM1885C1H331J
CoilCraft 1008CS-561XJBB
—
—
Mini-Circuits TC4-1W-7A
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| MAX9981EGX-T | 825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9981EGX | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Rail/Tube |
| MAX9981EGX-T | 制造商:Maxim Integrated Products 功能描述:825MHZ TO 915MHZ DUAL SIGE HIGH-LINEARITY ACT - Tape and Reel |
| MAX9981ETX | 功能描述:射頻混合器 825-915MHz Dual Active Mixer RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| MAX9981ETX+ | 功能描述:射頻混合器 825-915MHz Dual SiGe Active Mixer RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| MAX9981ETX+D | 功能描述:射頻混合器 825-915MHz Dual SiGe Active Mixer RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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