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ML7344J датащи(PDF) 93 Page - List of Unclassifed Manufacturers

номер детали ML7344J
подробное описание детали  Sub-GHz band short range wireless transceiver IC
PDF  151 Pages
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производитель  ETC2 [List of Unclassifed Manufacturers]
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ML7344J датащи(HTML) 93 Page - List of Unclassifed Manufacturers

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●I/Q adjustment
Image rejection ratio can be adjusted by tuning IQ signal balance. The adjustment procedure is as follows:
1. From SG, image frequency signal is input to ANT pin (#24).
Input signal:
no modulation wave
Input frequency:
channel frequency - (2 * IF frequency)
IF frequency = 200kHz:
Input level:
-70dBm
2. Isuuing RX_ON by [RF_STATUS:B0 0x0b] register, by adjusting [IQ_MAG_ADJ: B0 0x6C] and
[IQ_PHASE_ADJ: B0 0x6D]registers, finding setting value so that ED value [ED_RSLT: B0 0x3A] is
minimum.
●IQ adjustment flow
For IQ adjustment, using Bank2 (closed Bank) registers. Any other register access is inhibited.
END
1
Read ED value
[ED_RSLT: B0 0x3A]
IQ Bias initializing setting
[IQ_BIAS_IN: B2 0x2D] = 0x80
[IQ_BIAS_QN:B2 0x2F] = 0x80
START
Power on
SG output setting
modulation: no modulation
level : -70dBm
frequency: CH frequency- 2 * IF
frequency
Initialize setting
* Please refer to
“Initialization table”.
RX_ON setting
[RF_STATUS: B0 0x0B]
1
IQ adjustment by following register
[IQ_BIAS_IP: B2 0x2D]
[IQ_BIAS_QP:B2 0x2F]
Read ED value < Target value ?
Change setting value of
[IQ_BIAS_IP: B2 0x2D]
[IQ_BIAS_QP:B2 0x2F]
No
Yes



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