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SiGe High-Linearity, 1400MHz to 2200MHz
Downconversion Mixer with LO Buffer/Switch
Pin Description
PIN
1, 6, 8, 14
2
3
4, 5, 10, 12,
13, 17
7
9
11
15
16
18, 19
20
—
NAME
V CC
RF
TAP
GND
LOBIAS
LOSEL
LO1
LO2
LEXT
IF-, IF+
IFBIAS
EP
FUNCTION
Power-Supply Connection. Bypass each V CC pin to GND with capacitors as shown in the Typical
Application Circuit .
Single-Ended 50 ? RF Input. This port is internally matched and DC shorted to GND through a balun.
Requires an external DC-blocking capacitor.
Center Tap of the Internal RF Balun. Bypass to GND with capacitors close to the IC, as shown in the
Typical Application Circuit .
Ground
Bias Resistor for Internal LO Buffer. Connect a 549 ? ± 1% resistor from LOBIAS to the power supply.
Local Oscillator Select. Logic control input for selecting LO1 or LO2.
Local Oscillator Input 1. Drive LOSEL low to select LO1.
Local Oscillator Input 2. Drive LOSEL high to select LO2.
External Inductor Connection. Connect a low-ESR, 10nH inductor from LEXT to GND. This inductor
carries approximately 100mA DC current.
Differential IF Outputs. Each output requires external bias to V CC through an RF choke (see the Typical
Application Circuit ).
IF Bias Resistor Connection for IF Amplifier. Connect an 806 ? resistor from IFBIAS to GND.
Exposed Pad. Solder the exposed pad to the ground plane using multiple vias.
Detailed Description
The MAX9994 high-linearity downconversion mixer pro-
vides 8.3dB of conversion gain and 26.2dBm of IIP3,
with a typical 9.7dB noise figure. The integrated baluns
and matching circuitry allow for 50 ? single-ended inter-
faces to the RF and the two LO ports. A single-pole,
double-throw (SPDT) switch provides 50ns switching
time between the two LO inputs with 45dB of LO-to-LO
isolation. Furthermore, the integrated LO buffer pro-
vides a high drive level to the mixer core, reducing the
LO drive required at the MAX9994’s inputs to a range
of -3dBm to +3dBm. The IF port incorporates a differ-
ential output, which is ideal for providing enhanced IIP2
performance.
Specifications are guaranteed over broad frequency
ranges to allow for use in WCDMA, TD-SCDMA, LTE,
TD-LTE, cdma2000, and 2G/2.5G/3G DCS1800 and
PCS1900 base stations. The MAX9994 is specified to
operate over a 1400MHz to 2200MHz RF frequency
range, a 1400MHz to 2000MHz LO frequency range,
and a 40MHz to 350MHz IF frequency range. Operation
beyond these ranges is possible; see the Typical
Operating Characteristics for additional details.
With a wide LO range of 1400MHz to 2000MHz, the
MAX9994 can be used in either high-side or low-side
LO injection architectures, depending on the RF band
of interest. Higher LO applications are supported by
the MAX9996, which is pin-pin and functionally compat-
ible with the MAX9994.
RF Input and Balun
The MAX9994 RF input is internally matched to 50 ? ,
requiring no external matching components. A DC-
blocking capacitor is required because the input is
internally DC shorted to ground through the on-chip
balun. Input return loss is typically 21dB over the entire
1700MHz to 2200MHz RF frequency range.
LO Inputs, Buffer, and Balun
The MAX9994 can be used for either high-side or low-
side injection applications with a 1400MHz to 2000MHz
LO frequency range. For a device with a 1900MHz to
2400MHz LO frequency range, refer to the MAX9996
data sheet. As an added feature, the MAX9994 includes
an internal LO SPDT switch that can be used for fre-
quency-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
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MAX9995ETX+T 功能描述:上下转换器 SiGe 1700-2200MHz 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
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