| PIN | NAME | FUNCTION |
| 1 2 | IDC-, IDC+ | l-Channel Baseband DC Offset Correction. Connect a 0.1 UF ceramic chip capacitor from IDC- to IDC+. |
| 3 | VCCRF1 | DC Power Supply for LNA and First-Stage RF VGA. Connect to a 5V +5% low-noise supply. Bypass with a lnF capacitor directly to GKID. Do not share vias. |
| 4 | R Fllxl - | 75Q RF-Inverting Input. Working in conjunction with RFIN+ for differential input. Terminate with 22pF capacitor in series with a 75Q resistor to GND for single-ended input. |
| 5 | R Fllxl+ | 75Q RF Noninverting Input. Working in conjunction with RFIN- for differential input. Connect to source through a 22pF series capacitor. |
| 6, 9, 11, 25, 31 | N.C | No Connection. Pin should be connected directly to GND. |
| 7 | GC1 | Gain Control Input for RF Front End. High-impedance analog input with an operating range of 0.75V t0 2.6V. VGCl = 0.75V corresponds to maximum gain. |
| 8. 28 | VREGl, VREG2 | 2.85V Linear Regulator. Used for terminating open-drain interfaces from demodulator. Each regulator can source 3mA. |
| 10 | PAD | Ground. Direct connection to exposed pad. Can be used to check exposed pad continuity to ground. |
| 12 | VCCLO | DC Power Supply for LO Circuits. Connect to a 5V +5% low-noise supply. Bypass with a lnF capacitor directly to GND. Do not share vias. |
| 13 | VCCVCO | DC Power Supply for VCO Circuits. Connect to a 5V +5% low-noise supply. See the Applicatios Information section for more details. |
| 14 | LOFLT | LO Internal Regulator Bypass. Bypass with a 0.22UF ceramic chip capacitor to GlxID. |
| 15, 26, 32 | AS2, ASl, ASO | 12C Address Select Control. See Table l and Table 2. These pins are internally pullup to VCC. For logic high, leave these pins open. |
| 16 | VTUNE | High Impedance VCO Tune Input |
| 17 | CPOUT | Charge-Pump Output |
| 18 | IFLT | Test Pin. For normal operation, connect IFLT to ground. |
| 19 | VCCCP× | DC Power Supply for Charge Pump and XTAL Oscillator Circuits. Connect to a 5V +5% low- noise supply. Bypass with a lnF capacitor directly to GND. Do not share vias. |
| 20 | CFLT | Bypass for Internal Crystal Oscillator Bias. Bypass with a 0.22uF ceramic chip capacitor to GND. |
| 21 22 | XTL+, XTAL- | Crystal Oscillator Interface. See Typical Operating Circuit. |
| 23 | CNTOUT | Test Pin. Must be left open. |
| 24 | XTALOUT | Crystal Oscillator Buffer Output. Requires a 10nF DC-blocking capacitor. |
| 27 29 | SDA, SCL | 12C Data and Clock Interface. See the Applicatios Information section for details. |
| 30 | VCCDIG | DC Power Supply for Digital Circuits. Connect to a 5V +5% low-noise supply. Bypass with a lnF capacitor directly to GND. Do not share vias. |
| | N.C. (MAX2116) | No Connection. Pin should be connected directly to GND. |
| 33 | ClOUT- (MAX2118) | Inverting Baseband Cluadrature Output |
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