ML7396AB datasheet(73/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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Programming Channel#0 Frequency

Channel #0 frequency can be set by [CH0_FL:B0 0x48], [CH0_FM:B0 0x49], [CH_FH:B0 0x4A] and [CH_NA:B0

0x4B] registers.

Each setting parameters for channel #0 can be calculated using the following formula.

N = f / fREF / P (Integer part)

A = f / fREF - N * P (Integer part)

F = {f / fREF - (N * P + A)} * 2

20 (Integer part)

[note: useing 20bit circuit]

Here

: Channel #0 fequency

fREF

: PLL reference frequency (input clock=36MHz)

: Dual modulus parameter (fixed to 4)

: N-counter parameter

: A-counter parameter

: F-counter parameter

And frequency error can be calculated using the following formula.

ferr = f - [fREF * {(N * P + A) + F/2

20}]

[Example] When set channel #0 frequecy to 923.1MHz, the calculations are as follows. (fREF = 36MHz)

N = 923.1MHz / 36MHz / 4 (Integer part) = 6

A = 923.1MHz / 36MMHz- 6 * 4 (Integer part) = 1

F = {923. 1MHz / 36MHz - (6 *4 + 1)} *220 (Integer part) = 672836 (0xA4444)

Therefore

[CH0_FL:B0 0x48] = 0x44

[CH0_FM:B0 0x49] = 0x44

[CH0_FH:B0 0x4A] = 0x0A

[CH0_NA:B0 0x4B] = 0x61

Feuqency error will be ferr = 923. 1MHz - [36MHz * {(6 * 4 + 1) + 672836 / 220}] = +31.7Hz

Programming Channel pace

Channel space can be set by [CH_SPACE_L:B0 0x4C] and [CH_SPACE_H:B0 0x4D] registers.

Channel space is frequency space between centre frequency of given channel and that of adjacent channel.

Channel space setting value can be calculated using the following formula.

CH_SP_F = {fSP / fREF} * 2

20 (Integr part)

[note: using 20bit circuit]

Here

CH_SP_F

: Channel space setting

fSP

: Channel space [MHz]

fREF

: PLL reference frequency (input clock=36MHz)

[Example] When set channel space is 400kHz, the calculation are as follow. (fREF = 36MHz)

CH_SP_F = {0.4MHz / 36MHz} * 220 (Integer part) = 11650 (0x2D82)

Therefore

[CH_SPACE_L:B0 0x4C] = 0x82

[CH_SPACE_H:B0 0x4D] = 0x2D

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