ML7344J datasheet(94/151 Pages) ETC2

94 / 151 page

FEDL7344C/E/J-04

ML7344C/E/J

94/151

●VCO adjustment

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

each TX/RX operation and 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.

●VCO adjustment flow

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

NOTE:1) VCO calibration should be performed only during IDLE state.

VCO calibration is necessary every 2.6ms to 8.8ms.

After completion, capacitance compensation values are stored in the following registers.

Capacitance compensation value at TX low limit frequency: [TXVCAL_MIN: B1 0x52]

Capacitance compensation value at TX upper limit frequency: [TXVCAL_MAX: B1 0x53]

Capacitance compensation value at RX low limit frequency: [RXVCAL_MIN: B1 0x54]

Capacitance compensation value at RX upper limit frequency: [RXVCAL_MAX: B1 0x55]

START

END

Setting low limit frequency

[VCO_CAL_MIN_I: B1 0x4D]

[VCO_CAL_MIN_FH: B1 0x4E]

[VCO_CAL_MIN_FM: B1 0x4F]

[VCO_CAL_MIN_FL: B1 0x50]

Setting operation frequency range

[VCO_CAL_MAX_N: B1 0x51]

Initialize

setting

VCO calibration completion INT. clear

INT[1] ([INT_SOURCE_GRP1: B0 0x0D])

Set VCO_CAL_START = 0b1

[VCO_CAL_START: B0 0x6F(0)]

Start

calibration

Calibration operation

Completion wait

VCO calibration completion INT?

INT[1] [INT_SOURCE_GRP1: B0 0x0D]

Yes

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