ADRF6750 Analog Devices, Inc., ADRF6750 Datasheet - Page 15

• Manufacturer Part Number: ADRF6750
• Description: 950 Mhz To 1575 Mhz Quadrature Modulator With Integrated Fractional-n Pll And Vco
• Manufacturer: Analog Devices, Inc.

Figure 37. Attenuator Relative Step Accuracy over all Attenuation Steps
Figure 35. PLL Frequency Settling Time at Worst-Case Low Frequency
100M
100k
10M
10k
100
1M
1G
0.1
–10
–15
–20
–25
–30
–35
–40
–45
–50
–0.2
–0.4
–0.6
–0.8
–1.0
1k
10
1.0
0.8
0.6
0.4
0.2
–5
Figure 36. Attenuator Gain vs. LO Frequency by Gain Code,
1
0
–50 –25
0
START OF ACQUISITION
ON CR0 WRITE
vs. LO Frequency, Nominal Conditions
0
LDET
LDET
25
All Attenuator Code Steps
with Lock Detect Shown
50
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
75
TIME (µs)
CR23[3] = 1
CR23[3] = 0
100 125 150 175 200 225 250
ACQUISITION
TO 100Hz
Rev. 0 | Page 15 of 40
Figure 40. Attenuator Relative Step Accuracy over all Attenuation Steps
Frequency Range Distribution at Nominal and Worst-Case Conditions
Figure 38. Attenuator Relative Step Accuracy Distribution at Nominal
Figure 39. Attenuator Relative Step Accuracy Across Full Output
–0.1
–0.3
–0.5
–0.7
–0.9
–1.1
–1.3
–1.5
vs. LO Frequency for External VCO Mode, Nominal Conditions
50
45
40
35
30
25
20
15
10
50
45
40
35
30
25
20
15
10
0.5
0.3
0.1
5
0
–1.0
5
0
–0.8
ATTENUATOR RELATIVE STEP ACCURACY ACROSS
ATTENUATOR RELATIVE STEP ACCURACY (dB)
–0.6
FULL OUTPUT FREQUENCY RANGE (dB)
and Worst-Case Conditions
–0.4 –0.2
LO FREQUENCY (MHz)
0
0.2
0.4
NOMINAL
WORST CASE
NOMINAL
WORST CASE
0.6
ADRF6750
0.8
1.0