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ML7436N LSI Hardware Design Manual

FEXL7436NDG-01

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(Note) “LAPIS Technology” as used in this document means LAPIS Technology Co., Ltd.

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Содержание LAPIS ML7436N

Страница 1: ...ML7436N LSI Hardware Design Manual Issue Date Jan 19th 2021 FEXL7436NDG 01...

Страница 2: ...Technology Products or the information contained in this document including but not limited to the Product data drawings charts programs algorithms and application examples etc Therefore LAPIS Technol...

Страница 3: ...s regarding the information contained in this document or LAPIS Technology s Products 11 This document in part or in whole may not be reprinted or reproduced without prior consent of LAPIS Technology...

Страница 4: ...ML7436N devices Hereafter ML7436N And also contains the measurement conditions and example of measurement results of RF characteristics Target product ML7436N The following related manual is availabl...

Страница 5: ...wercase 103 1000 Milli m 10 3 Micro 10 6 Nano n 10 9 Second s lowercase Second Terminology H level Signal level on the high voltage side indicates the voltage level of VIH and VOH as defined in electr...

Страница 6: ...7 1 2 Adjustment of LNA input impedance real part to 50 15 7 1 3 Adjustment of LNA input impedance imaginary part to 0 16 7 1 4 Connection to antenna 17 7 1 5 Reception matching value 17 7 2 SubGHz t...

Страница 7: ...ltilayer ceramic capacitor to the RF_VBG 28 pin to reduce the noise from the band gap reference circuit 2 Crystal Oscillator circuit Figure 2 1 shows a configuration example of the crystal oscillator...

Страница 8: ...oscillator circuit The capacitor s value of C1 C2 C3 and C4 depends on the crystal oscillator specification C1 C2 C3 and C4 should be placed as close as possible to the RF_XIN 1 the RF_XOUT 48 the CNI...

Страница 9: ...applied to the RF_XOUT 48 pin A 100pF capacitor should be placed on the TCXO line as followingFigure 3 1 In ML7436N RF_XIN 1 pins is N C pin then it should be open It is necessary to turn TCXO off to...

Страница 10: ...tions 5 Internal ADC ML7436N integrates a internal capacitor 20pF Typ that holds electric charge by ADC0 input voltage Connect more than 0 22uF capacitor when DC voltage level is measured with AD conv...

Страница 11: ...ving transmission circuit as reference can maximize the power efficiency of transmission circuit Table 7 1 is the Measured RF impedance of each RF pins Table 7 1 Measured RF impedance of each RF pins...

Страница 12: ...filter is adopted to remove the interfering wave At the transmission circuit DC voltage is biased at RF_REG_PA 32 pin through the choke coil of RF_PA_OUT1 33 pin It composes LPF Low Pass Filter and t...

Страница 13: ...e Figure 7 2 is the measured value of the input impedance at RF_LNA_IN1 35 pin Figure 7 2 Measured input impedance The input impedance at the RF_LNA_IN1 35 can be expressed by the equivalent circuit t...

Страница 14: ...of coupling capacitor Figure 7 4 shows that the connection of enough AC coupling capacitor Cac 100pF is connected to RF_LNA_IN1 pin RF_LNA_IN1 pin is biased to the stable DC voltage by the internal ci...

Страница 15: ...f LNA input impedance real part to 50 Figure 7 5 shows the inductor Lmatch parallel connection It adjusts the LNA input impedance real part to 50 Figure 7 5 Addition of Lmatch The required inductance...

Страница 16: ...lues convert input impedances to 1 50 jX 2 50 jX In case of 2 50 jX Lmatch is too large value it is difficult to adjust Lmatch value LAPIS technology recommends adopting 1 50 jX 7 1 3 Adjustment of LN...

Страница 17: ...on 7 1 4 Connection to antenna Figure 7 9 shows the connection between antenna and the matching circuit The characteristic impedance is 50 Figure 7 9 Addition of the characteristic impedance 50 line 7...

Страница 18: ...igher harmonics with T or type Chebyshev LPF Cz Lz Cz Figure 7 10 The cutoff frequency is approximately 1 5 times of the transmission frequency the ripple of passband is approximately 0 5dB the order...

Страница 19: ...9 3 9 100 4 3 6 8 2 7 2 7 7 3 2 4GHz RF matching development procedure Figure 7 12 shows the example of the 2 4GHz RF matching circuit configuration The trap filter is configured to suppress the high...

Страница 20: ...nics It is required to decide the maximum value of the higher harmonics and adjust the values meeting standards If necessary the trap filters are added to suppress every higher harmonic 7 3 2 Addition...

Страница 21: ...dance is not 50 because the transmission character is prioritized over the reception character LAPIS technology tests the circuit with this impedance on the mass production process and confirm the min...

Страница 22: ...with the trap filter suppressing the second the third harmonics and the matching circuit converting antenna load impedance to 50 Table 7 5 shows the matching circuit value Figure 7 16 2 4GHz RF match...

Страница 23: ...pedance 50 8 2 Inductors Use inductors with high Q It is recommended to use LQW03AW series manufactured by Murata Manufacturing Co Ltd or equivalent Use inductors for the switching regulators that DC...

Страница 24: ...D impedance Almost of L2 layer should be GND plane for double layerd board Figure 9 1 shows the ML7436N package figure The IC s back side GND PAD floats on the board The distance is 0 25mm Adjust the...

Страница 25: ...o minimize the large current loop Mount inductor and capacitor close to IC and connect them with low impedance Mount the inductor L1 of the switching regulator and the transmission choke inductor L4 a...

Страница 26: ...gn Fix REGPDIN 12 pin and TEST 39 pin to GND at the normal operation Fix RF_AMON 5 pin to OPEN When using TCXO fix RF_XIN 1 pin to OPEN Refer section 3 TCXO circuit When not using 2 4GHz band fix RF_L...

Страница 27: ...ML7436N LSI Hardware Design Manual FEXL7436NDG 01 27 For DC DC For SubGHz band 420 440 860 870 920 930MHz For 2 4GHz band...

Страница 28: ...GRM033 series 0603mm C19 1uF GRM033R61A105ME15E Murata Manufacturing GRM033 series 0603mm C20 100pF GRM0335C1H101JA01 Murata Manufacturing GRM033 series 0603mm C21 1 5pF GJM0335C1H1R5WB01 1 1pF GJM033...

Страница 29: ...ML7436N LSI Hardware Design Manual FEXL7436NDG 01 29 Revision history Document No Date Page Content Previous New FEXL7436NDG 01 2021 1 19 The first edition...

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