ADF5610 datasheet(22/51 Pages) AD

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ADF5610

Data Sheet

Rev. 0 | Page 22 of 51

The FSM clock only affects the time to produce the result. This

same time standard clocks the 16-bit VSPI.

If the time to change frequencies is not a concern, use the longest

calibration time, because this provides the minimum frequency

error during band selection. The longest calibration time results

in the selection of bands where the desired frequency is as close

as possible to the recommended tuning voltage value as

determined by the temperature compensation circuit.

Using an input crystal of 50 MHz (R = 1 and fPD = 50 MHz), the

times and accuracies for calibration using Equation 6 and

Equation 8 are listed in Table 9, where minimal tuning time is

1/8 of the VCO band spacing.

XREFP

CALIBRATION WINDOW

REG 0x02

START

VCO

CTR

FSM

50MHz MAX FOR

FSM + VSPI CLOCKS

REG 0x0A[14:13]

m = [0, 2, 4, 5]

REG 0x0A[2:0]

n = [0, 1, 2, 3, 5, 6, 7, 8]

STOP

tMMT = tXTAL × R × 2n

tPD

÷ 2n

÷ 2m

÷ R

Figure 22. VCO Calibration

Table 9. Autocalibration Example with fXTAL = 50 MHz, R = 1, m = 2

VCO Autocalibration Configuration Register 0x0A, Bits[2:0]

tMMT (µs)

tCAL (µs)

fERR Maximum

0.02

33.44

±25 MHz

0.04

33.60

±12.5 MHz

0.08

33.92

±6.25 MHz

0.16

34.56

±3.125 MHz

0.64

38.40

±781 kHz

1.28

43.52

±390 kHz

128

2.56

53.76

±95 kHz

256

5.12

74.24

±98 kHz

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