ST7LNB1Y0 datasheet(18/36 Pages) STMICROELECTRONICS

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ST7LNB1Y0 configuration

ST7LNB1Y0

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SaTCR1 matrix truth table

(4)

ACh

35h

SaTCR2 matrix truth table

59h

6Ah

SaTCR3 matrix truth table

56h

9Ah

SaTCR4 matrix truth table

95h

A6h

SaTCR5 matrix truth table

FFh

SaTCR6 matrix truth table

FFh

SaTCR7 matrix truth table

FFh

SaTCR8 matrix truth table / legacy matrix

FFh

SaTCRs GAIN(5)

SaTCRs 1 to 4 Gain

FFh

SaTCRs 5 to 8 Gain

FFh

SaTCRs number

(6)

04h

Tuning step size (unit= 1MHz)

04h

Software Version Number

14h

2A /

RESERVED(7)

Besides the address defined in the EEPROM at index 00h, addresses 10h and 00h are recognized also as valid addresses.

SaTCRX BPF = BPFX center frequency (MHz) / 2.

When an application supports the wide RF band only one local oscillator with a frequency FLO is present in the LNB. In this

case the selection of the high or the low band for the legacy output is performed by a dedicated SaTCR.

Two parameters are needed for the band selection:

- The tuning word for the low band selection = [(FLO (MHz) - FLow (MHz))/ 4] - 350: where FLow corresponds to the Low LO

frequency.

- The tuning word for the high band selection = [(FLO (MHz) - FHigh (MHz))/4] - 350: where FHigh corresponds to the High band

LO frequency.

Example: in a wide band application with FLO= 13250 MHz, for emulating a low band local oscillator at 9750 MHz, index

0Dh and index 0Eh must be loaded with the decimal value D = dec [0D:0E] = round ((13250-9750)/4) - 350 = 525.

Matrix truth table for SaTCRx or legacy:

- If 4 RF inputs are implemented then the matrix truth table has the following coding on 2 bytes: “aaaabbbb ccccdddd”

where:

aaaa= selection of Feed1 on SaTCRx, aaaa = [MAT4, MAT3, MAT2, MAT1]

bbbb= selection of Feed0 on SaTCRx, bbbb = [MAT4, MAT3, MAT2, MAT1]

cccc = selection of Feed3 on SaTCRx, cccc = [MAT4, MAT3, MAT2, MAT1]

dddd= selection of Feed2 on SaTCRx,dddd = [MAT4, MAT3, MAT2, MAT1]

- If 8RF inputs are implemented then the truth table given in Table 17 is used.

Table 16.

ST7LNB1Y0 EEPROM parameters (continued)

Index

Parameter

Description

Default

value

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