AD9546SLASHPCBZ datasheet(25/205 Pages) AD

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Data Sheet

AD9546

Rev. 0 | Page 25 of 205

HOLDOVER SPECIFICATIONS

Table 20.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

HOLDOVER SPECIFICATIONS

Initial Frequency

Accuracy

±0.01

±0.1

ppb

AD9546 is configured using Device Configuration 1 from Table 37; excludes

frequency drift of SYSCLK source; excludes frequency drift of input

reference prior to entering holdover; 160 ms history timer; history

holdoff setting = 8 decimal in Register 0x1010 and Register 0x1410; three

features (bits) are Logic 1: Bit 4 in Register 0x100E and Register 0x140E,

Bit 3 in Register 0x100E and Register 0x140E, and Bit 5 in Register 0x100E

and Register 0x140E

Relative Frequency

Accuracy Between

Channels

Cascaded DPLL

Operation

ppb

Noncascaded DPLL

Operation

ppb

fOSC = 52 MHz (stable external oscillator); fOUT = 155.52 MHz; fREF = 38.88

MHz; DPLL loop bandwidth = 50 Hz; DPLL history accumulation timer = 1

ms; DPLL history holdoff value = 1

History Averaging

Window

0.001

26,8435

sec

ANALOG PLL (APLL0 AND APLL1) SPECIFICATIONS

Table 21.

Parameter

Min

Typ

Max

Unit

VCO FREQUENCY RANGE

Analog PLL0 (APLL0)

2424

3232

MHz

Analog PLL1 (APLL1)

3232

4040

MHz

PFD INPUT FREQUENCY RANGE

162

350

MHz

LOOP BANDWIDTH

260

kHz

PHASE MARGIN

Degrees

OUTPUT CHANNEL DIVIDER SPECIFICATIONS

Table 22.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

OUTPUT PHASE ADJUST

STEP SIZE

tVCO

VCO time period (tVCO) = 1/(APLLx VCO frequency), where x = 0 or 1

MODULATOR

Carrier Frequency

fVCO/16

The maximum value is the APLLx VCO frequency divided by 16, where x = 0 or 1;

fVCO is the VCO frequency

Time Deviation (from

Nominal Duty Cycle

of Carrier Clock)

216 − 1

tVCO

tVCO = 1/(APLLx VCO frequency), where x = 0 or 1; the maximum value is limited

to the Qxy divide ratio − 1; Qxy refers to the distribution dividers on each

output, where x is either 0 (for PLL0) or 1 (for PLL1), and y is A, B, or C

Embedded Frequency

fOUT/

(228 − 1)

fOUT/6

fOUT is the output frequency

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