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MAX9995 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX9995 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 13 page MAX9995 Dual, SiGe, High-Linearity, 1700MHz to 2700MHz Downconversion Mixer with LO Buffer/Switch 10 Maxim Integrated Detailed Description The MAX9995 dual, high-linearity, downconversion mixer provides 6.1dB gain and +25.6dBm IIP3, with a 9.8dB noise figure. Integrated baluns and matching cir- cuitry allow 50 Ω single-ended interfaces to the RF and LO ports. A single-pole, double-throw (SPDT) LO switch provides 50ns switching time between LO inputs, with 50dB LO-to-LO isolation. Furthermore, the integrated LO buffer provides a high drive level to the mixer core, reducing the LO drive required at the MAX9995’s inputs to -3dBm. The IF port incorporates a differential output, which is ideal for providing enhanced 2RF - 2LO performance. Specifications are guaranteed over broad frequency ranges to allow for use in WCDMA, TD-SCDMA, LTE, TD-LTE, and GSM/EDGE base stations. The MAX9995 is specified to operate over an RF input range of 1700MHz to 2700MHz, an LO range of 1400MHz to 2600MHz, and an IF range of 40MHz to 350MHz. Operation beyond this is possible; however, perfor- mance is not characterized. This device is available in a compact 6mm x 6mm, 36-pin TQFN package with an exposed pad. RF Input and Balun The MAX9995’s two RF inputs (RFMAIN and RFDIV) are internally matched to 50 Ω, requiring no external match- ing components. DC-blocking capacitors are required as the inputs are internally DC shorted to ground through the on-chip baluns. Input return loss is typically 14dB over the entire RF frequency range of 1700MHz to 2700MHz. LO Input, Switch, Buffer, and Balun The mixers can be used for either high-side or low-side injection applications with an LO frequency range of 1400MHz to 2600MHz. As an added feature, the MAX9995 includes an internal LO SPDT switch that can be used for 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 less than 50ns, which is more than adequate for virtually all GSM applications. If frequency hopping is not employed, set the switch to either of the LO inputs. The switch is controlled by a digital input (LOSEL): logic-high selects LO1, and logic-low selects LO2. LO1 and LO2 inputs are internally matched to 50 Ω, requiring only a 22pF DC-blocking capacitor. A two-stage internal LO buffer allows a wide input power range for the LO drive. All guaranteed specifica- tions are for an LO signal power from -3dBm to +3dBm. The on-chip low-loss balun, along with an LO buffer, drives the double-balanced mixer. All interfacing and matching components from the LO inputs to the IF out- puts are integrated on-chip. High-Linearity Mixers The core of the MAX9995 is a pair of double-balanced, high-performance passive mixers. Exceptional linearity is provided by the large LO swing from the on-chip LO buffer. When combined with the integrated IF ampli- fiers, the cascaded IIP3, 2RF - 2LO rejection, and NF performance is typically +25.6dBm, 66dBc, and 9.8dB, respectively. Differential IF Output Amplifiers The MAX9995 mixers have an IF frequency range of 40MHz to 350MHz. The differential, open-collector IF output ports require external pullup inductors to VCC. Note that these differential outputs are ideal for provid- ing enhanced 2RF - 2LO rejection performance. Single- ended IF applications require a 4:1 balun to transform the 200 Ω differential output impedance to a 50Ω single- ended output. After the balun, VSWR is typically 1.5:1. Applications Information Input and Output Matching The RF and LO inputs are internally matched to 50 Ω. No matching components are required. Return loss at each RF port is typically 14dB over the entire input range (1700MHz to 2700MHz), and return loss at the LO ports is typically 18dB (1400MHz to 2000MHz). 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 down to a 50 Ω single- ended output (see the Typical Application Circuit). Bias Resistors Bias currents for the LO buffer and the IF amplifier are optimized by fine tuning the resistors (R1, R2, R4, and R5). If reduced current is required at the expense of per- formance, contact the factory. If the ±1% bias resistor values are not readily available, substitute standard ±5% values. |
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Similar Description - MAX9995_13 |
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