NEO-6M T-MAX 20110301123456DDRF1 CON1_S MA D1 U1 circuit: 1. The parameter requirements of the components of the antenna interface are as follows: 1.1 The resistance of the active antenna power supply part: R1 is required to be: 10 ohm/0.25W, and the usual package is: 1206 1.2 The inductor of the active antenna power supply part: L1 is required to be: impedance @freq GPS>500 O The recommended model is: LQG15HS 27NJ02 1.3 ESD protection device D1 of the antenna interface: The TVS tube with a capacitance less than 0.5pF is required. The recommended model is: ESD9R3.3ST5G 2. Backup battery: The selection of the parameters of D2 and R9 is required to meet the backup power supply of the module: 1.4-3.6v/100uA, and can give the battery 3. U3 is optional and can be used to configure the module as required by the customer. C13 14 15 16 17GND MOSI/CF G_C OM0 MISO/CF G_C OM1 CFG_GPS0/SC K/NC SCS 1_N/NCGND RF_IN GND VC C_RF Reserved12 11 10 9 8RF_IN R1 10/0.25W_1206 L1 RF_IN CLQG15HS27NJ02_0402PC B Design considerations: 1. RF traces are not allowed to have protruding places (NO SUB), and the pads of inductors L1 and D1 are required to be placed on the RF traces as much as possible. 2. The RF line coming out of Pin 11 is designed as a coplanar waveguide with an impedance of 50 ohms, and is as short as possible, with ground passing through 2. TxD and RxD should not be parallel lines as much as possible, and it is best to separate them with ground. It is recommended to add test points to facilitate debugging and production testing. 3. Pin 22, Pin 23\'s 1uF capacitors should be as close as possible to each other...
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