ML7396AB datasheet(83/140 Pages) LAPIS

83 / 140 page

FEDL7396A/B/E-07

ML7396A/B/E

83/140

●VCO adjustment

In order to compensate VCO operation margin, optimized capacitance compensation value should be set in each operation

frequency. This capacitance compensation value can be acquired by VCO calibration.

By performing VCO calibration when power-up or reset, acquired capacitance compensation values for upper limit and lower

limit of operation frequency range (for both TX/RX), based on this value optimised capacitance value is applied during TX/RX

operation. Lower limit frequency can be set by [VCO_CAL_MIN_FL:B1 0x16] to [VCO_CAL_MIN_FH:B1 0x18] registers.

Upper frequency is definced by [VCO_CAL_MAX_N:B1 0x19] register as frequency range.

[VCO adjustment flow]

The following flow is the procedure for acquiring capacitance compensation value when power-up or reset.

START

Setting lower limit frequency

Initialize

setting

[VCO_CAL_MIN_FL:B1 0x16]

[VCO_CAL_MIN_FM:B1 0x17]

[VCO_CAL_MIN_FH:B1 0x18]

Setting operation frequency range

[VCO_CAL_MAX_N:B1 0x19]

Set VCO_CAL_START = 0b1

Start

calibration

[VCO_CAL_START:B1 0x1D(0)]

Note: VCO calibration should be performed only during IDLE state.

END

Calibration operation

VCO calibration completion?

INT[02]

Completion wait

[INT_SOURCE_GRP1:B0 0x24]

Yes

ML7396AB Datasheet(PDF) 83 Page - LAPIS Semiconductor Co., Ltd.