PDF《19-5875; Rev 1; 8/11》

18 27

31 mA Default mode, LNA2 is active (Note 2)

15 25 30.5 Idle ModeK, IDLE = low, SHDN = high

5 Shutdown mode, SHDN = low

200 FA Voltage Drop at ANTBIAS from VCC_RF Sourcing 20mA at ANTBIAS 0.2 V Short-Circuit Protection Current at ANTBIAS ANTBIAS is shorted to ground

57 mA Active Antenna Detection Current To assert logic-high at ANTFLAG 1.1 mA DIGITAL INPUT AND OUTPUT Digital Input Logic-High Measure at the SHDN pin 1.5 V Digital Input Logic-Low Measure at the SHDN pin 0.4 V MAX2769B 通用型GPS接收机 AC ELECTRICAL CHARACTERISTICS* (MAX2769B EV kit, VCC_ = 2.7V to 3.3V, TA = -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA input is driven from a 50I source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kI||7.5pF on each pin. Typical values are at VCC_ = 2.85V and TA = +25NC, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS CASCADED RF PERFORMANCE RF Frequency L1 band 1575.42 MHz Noise Figure LNA1 input active, default mode (Note 3) 1.4 dB LNA2 input active, default mode (Note 3) 2.7 Measured at the mixer input 10.3 Out-of-Band 3rd-Order Input Intercept Point Measured at the mixer input (Note 4) -7 dBm In-Band Mixer Input Referred 1dB Compression Point Measured at the mixer input -85 dBm Mixer Input Return Loss

10 dB Image Rejection

25 dB Spurs at LNA1 Input LO leakage -101 dBm Reference harmonics leakage -103 Maximum Voltage Gain Measured from the mixer to the baseband analog output

91 96

103 dB Variable Gain Range

55 59 dB FILTER RESPONSE Passband Center Frequency FBW =

00 4 MHz FBW =

10 4 FBW =

01 9.27 Passband 3dB Bandwidth FBW =

00 2.5 MHz FBW =

10 4.2 FBW =

01 9.66 Lowpass 3dB Bandwidth FBW =

11 9 MHz Stopband Attenuation 3rd-order filter, bandwidth = 2.5MHz, measured at 4MHz offset

30 dB 5th-order filter, bandwidth = 2.5MHz, measured at 4MHz offset

40 49.5 LNA LNA1 INPUT Power Gain

19 dB Noise Figure 0.83 dB Input IP3 (Note 5) -1.1 dBm Output Return Loss

10 dB Intput Return Loss

8 dB MAX2769B 通用型GPS接收机 AC ELECTRICAL CHARACTERISTICS* (continued) (MAX2769B EV kit, VCC_ = 2.7V to 3.3V, TA = -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA input is driven from a 50I source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kI||7.5pF on each pin. Typical value........