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| 型号： | MAX19985AETX+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/23页 |
| 文件大小： | 0K |
| 描述： | IC MIXER DOWNCONV 36-TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| RF 型： | 手机，EDGE，GSM，iDEN，WCDMA |
| 频率： | 700MHz ~ 1GHz |
| 混频器数目： | 1 |
| 增益： | 8.7dB |
| 噪音数据： | 9dB |
| 次要属性： | 降频变频器 |
| 电流 - 电源： | 280mA，380mA |
| 电源电压： | 3 V ~ 3.6 V，4.75 V ~ 5.25 V |
| 包装： | 管件 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
Applications Information
Input and Output Matching
The RF and LO inputs are internally matched to 50 Ω . No
matching components are required. The RF port input
return loss is typically 20dB over the RF frequency range
of 770MHz to 915MHz and return loss at the LO ports are
typically 20dB over the entire LO range. RF and LO inputs
require only DC-blocking capacitors for interfacing.
The IF output impedance is 200 Ω (differential). For
evaluation, an external low-loss 4:1 (impedance ratio)
balun transforms this impedance to a 50 Ω single-ended
output (see the Typical Application Circuit).
Externally Adjustable Bias
Each channel of the MAX19985A has two pins (LO_BIAS,
IF_BIAS) that allow external resistors to set the internal
bias currents. Nominal values for these resistors are given
in Table 2. Larger-value resistors can be used to reduce
power dissipation at the expense of some performance
loss. See the Typical Operating Characteristics to evaluate
the power vs. performance tradeoff. If ±1% resistors are
not readily available, ±5% resistors can be substituted.
Table 2. Component Values
LEXT_ Inductors
For applications requiring optimum RF-to-IF and LO-to-
IF isolation, connect a parallel combination of a low-
ESR inductor and a 500 Ω resistor from LEXT_ (pins 15
and 31) to ground. When improved isolation is not
required, connect LEXT_ to ground using a 0 Ω resis-
tance. See the Typical Operating Characteristics to
evaluate the isolation vs. inductor value tradeoff.
Layout Considerations
A properly designed PCB is an essential part of any
RF/microwave circuit. Keep RF signal lines as short as
possible to reduce losses, radiation, and inductance.
The load impedance presented to the mixer must be so
that any capacitance from both IF- and IF+ to ground
does not exceed several picofarads. For the best perfor-
mance, route the ground pin traces directly to the
exposed pad under the package. The PCB exposed
pad MUST be connected to the ground plane of the
PCB. It is suggested that multiple vias be used to con-
nect this pad to the lower-level ground planes. This
method provides a good RF/thermal-conduction path for
the device. Solder the exposed pad on the bottom of the
COMPONENT
C1, C2, C7, C8
C3, C6
C4, C5
C9, C13, C15, C17, C18
C10, C11, C12, C19, C20, C21
C14, C16
L1, L2, L4, L5
L3, L6
R1, R4
R2, R5
R3, R6
R7, R8
T1, T2
U1
VALUE
39pF
0.033μF
—
0.01μF
150pF
82pF
330nH
30nH
698 Ω
1.2k Ω
600 Ω
0 Ω
500 Ω
4:1
—
DESCRIPTION
Microwave capacitors (0402)
Microwave capacitors (0603)
Not used
Microwave capacitors (0402)
Microwave capacitors (0603)
Microwave capacitors (0402)
Wire-wound high-Q inductors (0805)
Wire-wound high-Q inductors (0603). Smaller values can be used at the expense of
some performance loss (see the Typical Operating Characteristics ).
±1% resistors (0402). Larger values can be used to reduce power at the expense of
some performance loss (see the Typical Operating Characteristics ).
±1% resistors (0402). Use for V CC = +5.0V applications. Larger values can be used
to reduce power at the expense of some performance loss (see the Typical
Operating Characteristics ).
±1% resistors (0402). Use for V CC = +3.3V applications.
±1% resistors (1206)
±1% resistors (0402)
Transformers (200:50)
Mini-Circuits TC4-1W-7A
MAX19985A IC
20
______________________________________________________________________________________
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PDF描述 |
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| MAX19999ETX+ | IC DOWNCONVERTER 2CH 36TQFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX19985AETX+ | 功能描述:上下转换器 High-Gain 700MHz to 1GHz Downconv RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX19985AETX+T | 功能描述:上下转换器 High-Gain 700MHz to 1GHz Downconv RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX19985ETX+ | 功能描述:上下转换器 Dual, SiGe, .7-1GHz Downconversion Mixer RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX19985ETX+T | 功能描述:上下转换器 Dual, SiGe, .7-1GHz Downconversion Mixer RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX1998ETP | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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