ML7396AB datasheet(82/140 Pages) LAPIS

82 / 140 page

FEDL7396A/B/E-07

ML7396A/B/E

82/140

●I/Q adjustment

Image rejection ratio can be adjusted by tuning IQ signal balance. The adjustment procedure is as follows:

From SG, image frequency signal is input to ANT pin (#30).

Input signal:

no modulation.wave

Input frequency:

channel frequency - (2 * IF frequency)

In case of 100kbps, IF frequency = 720kHz. please refer to the “Programing IF frequency”.

Input level:

-70dBm

By setting RSSI_OUT ([RSSI/TEMP_OUT:B1 0x03(0)]) =0b1, outputing RSSI from A_MON pin (#24).

Issuing RX_ON by [RF_STATUS:B0 0x6C] register, by adjusting [IQ_MAG_ADJ:B1 0x14] and [IQ_PHASE_ADJ:

B1 0x15] registers, finding setting value so that RSSI value is minimum by measuring A_MON pin (#24).

[I\Q adjustment flow]

START

Power on

Initialize setting

Please refer to

“Initial register setting” file.

RX_ON issue

[RF_STATUS:B0 0x6C]

Channel setting

[CH_SET:B0 0x6B]

Channel setting

[CH_SET:B0 0x6B]

RSSI output setting

[RSSI/TEMP_OUT:B1 0x03]

SG output setting

modulation: no modulation

level : -70dBm

frequency: CH frequency- 2 * IF

frequency

END

Amplitude, phase valur

confirm

Amplitude/phase re-adjustment

by changing range.

[IQ_MAG_ADJ] ±3LSB

[IQ_PHASE_ADJ] ±6LSB

so that RSSI value is minimum.

Set phase value

[IQ_PHASE_ADJ:B1 0x15]

Initial amplitude setting

[IQ_MAG_ADJ:B1 0x14]=0x08

Phase adjustment by

[IQ_PHASE_ADJ:B1 0x15], so

that RSSI value is minimum.

Amplitude adjustment by

[IQ_MAG_ADJ:B1 0x14], so

that RSSI value is minimum.

Set amplitude value

[IQ_MAG_ADJ:B1 0x14]

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