MC13180 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC13180

LOW POWER DC - 1.8 GHz LNA / MIXER and VCO

Motorola => Freescale 

Functional Description

these values to achieve a constant deviation. This scaling is linear. Two programmable constants are used

to form the equation of a line, the M & B dual-port multipliers. M-Dual Port Digital Multiplier Value (R17/

15-8), determines the slope, and B-Dual Port Digital Multiplier Value (R8/7-0), determines the intercept.

M-Dual Port Digital Multiplier = (frefExternal) /13MHz * 10810

B-Dual Port Digital Multiplier = (frefExternal) /13MHz * 10010

Table 19 contains slope and intercept point values across all supported input reference frequencies.

4.26 Dual-Port Programmable Delay (R7/15-11)

Just as it is necessary to maintain a constant deviation at Port2 of the VCO, it is also necessary to maintain

a constant phase at the FV and FR inputs of the main charge pump. The total delay from the output of the

LUT to the FV input of the charge pump is given as:

LUT → FV delay = 10.5 / (frefExternal)

Likewise, the total delay from the LUT to the FR input of the charge pump is:

LUT → FR delay = 28 ns + Delay

where delay is the programmed delay value shown in Table 18. Therefore, for a given external reference

frequency:

Delay = 10.5 / (frefExternal) - 28 ns.

Consult Table 18 for the closest available value.

Table 19 lists all values of the programmable delay for supported reference frequencies.

Table 18. Dual-Port Programmable Delay Values

R7/15-11

(decimal)

Delayb10

(ns)

R7/15-11

(decimal)

Delayb10

(ns)

4

167

13

542

5

208

14

583

6

250

15

625

7

292

16

667

8

333

17

708

9

375

18

750

10

417

19

792

11

458

20

833

12

500

21

875

36

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MOTOROLA

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