AD9864 datasheet(32/48 Pages) AD

номер детали	AD9864

подробное описание детали	IF Digitizing Subsystem

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производитель	AD [Analog Devices]

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32 / 48 page

Data Sheet

AD9864

Rev. A | Page 31 of 47

Table 21. SPI Registers Associated with Band-Pass Σ-∆ ADC

Address (Hex)

Value

Width

Default Value

Name

0x00

[7:0]

0xFF

STBY

0x1C

TUNE_LC

TUNE_RC

0x1D

[2:0]

CAPL1 [2:0]

0x1E

[5:0]

0x00

CAPL1 [5:0]

0x1F

[7:0]

0x00

CAPR

0x38

DACCR

0x39

[7:0]

0x00

DACDATA

0x3E

ADCCR

When the AD9864 is tuned, the noise figure degradation

attributed solely to the temperature drift of the LC and RC

resonators is minimal. Because the drift of the RC resonator is

actually negligible compared to that of the LC resonator, the

external L and C components temperature drift characteristics

tend to dominate. Figure 51 shows the degradation in noise

figure as the product of the LC value is allowed to vary from

−12.5% to +12.5%. Note that the noise figure remains relatively

constant over a ±3.5% range (±35,000 ppm), suggesting that

most applications do not need to be retuned over the operating

temperature range.

–15

LC ERROR (%)

–10

–5

BW = 75kHz

BW = 10kHz

BW = 30kHz

Figure 51. Typical Noise Figure Degradation from L and C

Component Drift (fCLK = 18 MSPS, fIF = 73.3501 MHz)

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