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MAX2150 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX2150 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page Wideband I/Q Modulator with Sigma-Delta Fractional-N Synthesizer 8 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1 TXEN Modulator Enable Input. Set TXEN low to inhibit the RF and modulator circuits. This mode can be used for quiet frequency synthesis. 2 VCC_PA Supply Voltage Input for RFOUT Output Driver Circuits. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 3 RFOUT Modulator RF Output. This is a wideband, internally matched 50 Ω output. A DC-blocking capacitor is required. 4, 5 N.C. Do Not Connect. (These pins must be left floating.) 6 LOCK Lock Status of the PLL. A static logic-level high indicates that the PLL is in the locked condition. 7 VCC_SD Supply Voltage Input for Sigma-Delta Modulator Circuits. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 8, 9, 10 CLK, DATA, EN Input Pins from 3-Wire Serial Bus. An RC lowpass filter on each of these pins can be used to reduce digital noise. 11 SHDN Shutdown Control. Set SHDN low to disable all internal circuits for lowest power consumption. An RC lowpass filter can be used to reduce digital noise. 12 SYNEN Synthesizer Enable Input. Set SYNTH low to disable the internal frequency synthesizer. An RC lowpass filter can be used to reduce digital noise. 13 OSCIN Reference Oscillator Input. Connect a parallel, resonant, fundamental-tone crystal between this pin and ground to facilitate a crystal oscillator circuit. For applications with an external reference oscillator, the OSCIN input can be driven through a large-value series capacitor. 14 VCC_XTAL Supply Voltage Input for Crystal Oscillator. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 15 VCC_CHP Supply Voltage Input for Charge Pump. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 16 CHP High-Impedance Charge-Pump Output. Connect to the tune input of the VCO through the PLL loop filter. Keep the line from this pin to the tune input as short as possible to prevent spurious pickup, and connect the loop filter as close to the tune input as possible. 17 VCC_A Supply Voltage Input for PLL. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 18 VCC_D Supply Voltage Input for PLL. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 19 VCC_LO Supply Voltage Input for Internal LO Circuits. Bypass as close to the pin as possible. The bypass capacitor should not share ground vias with other branches. 20, 21 LO-, LO+ Differential Local-Oscillator Input. These inputs require DC-blocking capacitors. The LO can be applied with a single-ended input to the LO+/LO- pin. In this mode, the other pin should be AC-grounded. 22 BUFOUT Buffered LO Output. Internally matched to 50 Ω, requires a DC-blocking capacitor. 23 BUFEN LO Output Buffer Amplifier Enable. Set BUFEN high to enable the on-chip output LO buffer for driving external circuits. An RC lowpass filter can be used to reduce digital noise. 24, 25 Q-, Q+ Differential Q-Channel Baseband Inputs to the Modulator. These pins connect directly to the bases of a differential pair and require an external common-mode bias voltage of 1.6V. |
Similar Part No. - MAX2150_06 |
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Similar Description - MAX2150_06 |
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