Datasheet AD8368 (Analog Devices) - 9

Data Sheet AD8368 50 45 40 35 B) d ( 30 E VGAIN = 0.75V UR 25 IG F E V 20 GAIN = 0V VGAIN = 1V IS NO 15 VGAIN = 0.25V 10 VGAIN = 0.5V 5
15 0 7- 90
0
05 8
10 100 1000
01 7-
FREQUENCY (MHz)
90 05 Figure 15. Noise Figure vs. Frequency at Maximum Gain (VMODE = 0 V) Figure 18. Input Reflection Coefficient vs. Frequency
50 0 45 –5 40 B) –10 d 35 ( B) S d S ( O –15 30 E UR 25 RN L IG –20 U F T E E 20 IS R –25 UT NO 15 P UT –30 70MHz 10 O 140MHz –35 5 240MHz
16
V
19 0
GAIN = 1V 380MHz
0 7- 7-
V
90
GAIN = 0V
90
0
05
–40
05
0 0.2 0.4 0.6 0.8 1.0 10 100 1000 VGAIN (V) FREQUENCY (MHz)
Figure 16. Noise Figure vs. VGAIN (VMODE = 0 V) Figure 19. Output Return Loss vs. Frequency
0 –5 VGAIN = 0.5V –10 B) d ( VGAIN = 0.75V S S –15 O VGAIN = 1V RN L –20 VGAIN = 1V U T E R –25 UT INP –30 VGAIN = 0V VGAIN = 0V –35
17 0
V
7-
GAIN = 0.25V
90
–40
05 20 0
10 100 1000
7- 90
FREQUENCY (MHz)
05 Figure 17. Input Return Loss vs. Frequency Figure 20. Output Reflection Coefficient vs. Frequency Rev. C | Page 9 of 20 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT DESCRIPTION INPUT ATTENUATOR AND INTERPOLATOR FIXED-GAIN STAGE AND OUTPUT BUFFER OUTPUT OFFSET CORRECTION INPUT AND OUTPUT IMPEDANCES GAIN CONTROL INTERFACE APPLICATIONS INFORMATION VGA OPERATION AGC OPERATION STABILITY AND LAYOUT CONSIDERATIONS EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE