MAX19993ETX+【PDF 19/23 页】IC MIXER DOWNCONV 36TQFN

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Dual, SiGe, High-Linearity, 1200MHz to 1700MHz

Downconversion Mixer with LO Buffer/Switch

Detailed Description

The MAX19993 is a dual-channel downconverter

designed to provide up to 6.4dB of conversion gain,

+27dBm input IP3, 15.4dBm 1dB input compression

point, and a noise figure of 9.8dB.

In addition to its high-linearity performance, the device

achieves a high level of component integration. It inte-

grates two double-balanced mixers for two-channel

downconversion. Both the main and diversity channels

include a balun and matching circuitry to allow 50 I

single-ended interfaces to the RF ports and the two LO

ports. An integrated single-pole/double-throw (SPDT)

switch provides 50ns switching time between the two LO

inputs with 57dB of LO-to-LO isolation and -38dBm of

LO leakage at the RF port. Furthermore, the integrated

LO buffers provide a high drive level to each mixer core,

reducing the LO drive required at the device’s inputs

to a range of -6dBm to +3dBm. The IF ports for both

channels incorporate differential outputs for downcon-

version, which is ideal for providing enhanced 2RF - 2LO

performance.

The device is specified to operate over an RF input range

of 1200MHz to 1700MHz, an LO range of 1000MHz to

1560MHz, and an IF range of 50MHz to 500MHz. The

external IF components set the lower frequency range. See

the Typical Operating Characteristics section for details.

Operation beyond these ranges is possible; see the

Typical Operating Characteristics section for additional

information. Although this device is optimized for low-

side LO injection applications, it can operate in high-

side LO injection modes as well. However, perfor-

mance degrades as f LO continues to increase. Contact

the factory for a variant with increased high-side LO

performance.

RF Port and Balun

The RF input ports of both the main and diversity

channels are internally matched to 50 I , requiring no

external matching components. A DC-blocking capacitor

is required as the input is internally DC shorted to ground

through the on-chip balun. The RF port input return

loss is typically better than 19dB over the 1400MHz to

1700MHz RF frequency range.

LO Inputs, Buffer, and Balun

The device is optimized for a 1000MHz to 1560MHz

LO frequency range. As an added feature, the device

includes an internal LO SPDT switch for use in frequency-

hopping applications. The switch selects one of the two

single-ended LO ports, allowing the external oscillator

to settle on a particular frequency before it is switched

in. LO switching time is typically 50ns, which is more

than adequate for typical GSM applications. If frequency

hopping is not employed, simply set the switch to

either of the LO inputs. The switch is controlled by a

digital input (LOSEL), where logic-high selects LO1

and logic-low selects LO2. LO1 and LO2 inputs are

internally matched to 50 I , requiring only 39pF

DC-blocking capacitors.

If LOSEL is connected directly to a logic source, then

voltage MUST be applied to V CC before digital logic

is applied to LOSEL to avoid damaging the part.

Alternatively, a 1k I resistor can be placed in series at

the LOSEL to limit the input current in applications where

LOSEL is applied before V CC .

The main and diversity channels incorporate a two-stage

LO buffer that allows for a wide-input power range for

the LO drive. The on-chip low-loss baluns, along with LO

buffers, drive the double-balanced mixers. All interfacing

and matching components from the LO inputs to the IF

outputs are integrated on-chip.

High-Linearity Mixer

The core of the device’s dual-channel downconverter

consists of two double-balanced, high-performance

passive mixers. Exceptional linearity is provided by

the large LO swing from the on-chip LO buffers. When

combined with the integrated IF amplifiers, the cascaded

IIP3, 2RF - 2LO rejection, and noise-figure performance

are typically +27dBm, 72dBc, and 9.8dB, respectively.

Differential IF

The device has a 50MHz to 500MHz IF frequency range,

where the low-end frequency depends on the frequency

response of the external IF components. Note that these

differential ports are ideal for providing enhanced IIP2

performance. Single-ended IF applications require a

4:1 (impedance ratio) balun to transform the 200 I

differential IF impedance to a 50 I single-ended system.

After the balun, the return loss is typically 15dB. The user

can use a differential IF amplifier on the mixer IF ports,

but a DC block is required on both IFD+/IFD- and IFM+/

IFM- ports to keep external DC from entering the IF ports

of the mixer.

19

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相关代理商/技术参数

MAX19993ETX+T 功能描述:上下转换器 High-Gain 1.2GHz to 1.7GHz 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

MAX19993EVKIT# 功能描述:射频开发工具 High-Gain 1.2GHz to 1.7GHz Downconv 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

MAX19994AETX+ 功能描述:上下转换器 High-Gain 1.2GHz to 2GHz 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

MAX19994AETX+T 功能描述:上下转换器 High-Gain 1.2GHz to 2GHz 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

MAX19994AEVKIT# 功能描述:射频开发工具 RF and RFID RF Evaluation & Development Kits & Boards - KIT EVAL FOR MAX19994A MIXER 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

MAX19995AETX+ 功能描述:上下转换器 High-Gain 1.2GHz to 2GHz 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

MAX19995AETX+T 功能描述:上下转换器 High-Gain 1.7GHz to 2.2GHz 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

MAX19995AEVKIT# 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