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AD9540 Просмотр технического описания (PDF) - Analog Devices

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AD9540

655 MHz Low Jitter Clock Generator

Analog Devices

AD9540 Datasheet PDF : 32 Pages

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AD9540

Parameter

51.84 MHz FOUT

@ 10 Hz Offset

@ 100 Hz Offset

@ 1 kHz Offset

@ 10 kHz Offset

@ 100 kHz Offset

> 1 MHz Offset

105 MHz Analog Out

@ 10 Hz Offset

@ 100 Hz Offset

@ 1 kHz Offset

@ 10 kHz Offset

@ 100 kHz Offset

>1 MHz Offset

155.52 MHz Analog Out

@ 10 Hz Offset

@ 100 Hz Offset

@ 1 kHz Offset

@ 10 kHz Offset

@ 100 kHz Offset

>1 MHz Offset

Min

Typ Max

110

121

135

142

148

153

105

115

126

132

140

145

100

112

123

131

138

144

Unit

dBc/Hz

Test Conditions/Comments

1 The SNR of a 14-bit ADC was measured with an ENCODE rate of 105 MSPS and an AIN of 170 MHz. The resultant SNR was known to be limited by the jitter of the clock,

not by the noise on the AIN signal. From this SNR value, the jitter affecting the measurement can be back calculated.

2 Driving the REFIN input buffer. The crystal oscillator section of this input stage performs up to only 30 MHz.

3 The charge pump output compliance range is functionally 0.2 V to (CP_VDD − 0.2 V). The value listed here is the compliance range for 5% matching.

4 The input impedance of the CLK1 input is 1500 Ω. However, to provide matching on the clock line, an external 50 Ω load is used.

5 Measured as peak-to-peak between DAC outputs.

6 For a 4.02 kΩ resistor from DRV_RSET to GND.

7 Assumes a 1 mA load.

LOOP MEASUREMENT CONDITIONS

622 MHz OC-12 Clock

VCO = Sirenza 190-640T

Reference = Wenzel 500-10116 (30.3 MHz)

Loop Filter = 10 kHz BW, 60° Phase Margin

C1 = 170 nF, R1 = 14.4 Ω, C2 = 5.11 µF, R2 = 89.3 Ω,

C3 Omitted

CP_OUT = 4 mA (Scaler = ×8)

÷R = 2, ÷M = 1, ÷N = 1

105 MHz Converter Clock

VCO = Sirenza 190-845T

Reference = Wenzel 500-10116 (30.3 MHz)

Loop Filter = 10 kHz BW, 45° Phase Margin

C1 = 117 nF, R1 = 28 Ω, C2 = 1.6 µF, R2 = 57.1 Ω, C3 = 53.4 nF

CP_OUT = 4 mA (Scaler = ×8)

÷R = 8, ÷M = 1, ÷N = 1

INPUT

OUTPUT

Figure 2. Generic Loop Filter

Rev. A | Page 8 of 32

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