Datasheet AD8370 (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | 750 MHz Digitally Controlled Variable Gain Amplifier |
| Seiten / Seite | 28 / 10 — AD8370. Data Sheet. 120. –10. 110. HD2 RL = 100. 100. –20. HD3 RL = 100. … |
| Revision | B |
| Dateiformat / Größe | PDF / 786 Kb |
| Dokumentensprache | Englisch |
AD8370. Data Sheet. 120. –10. 110. HD2 RL = 100. 100. –20. HD3 RL = 100. –30. –40. –50. PSRR (dB). 3 RL = 1k. –60. –70. HARMONIC DISTORTION (dBc)
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Textversion des Dokuments
AD8370 Data Sheet 0 120 –10 110 HD2 RL = 100
Ω
100 –20 HD3 RL = 100
Ω
90 –30 80 –40 70 –50 HD PSRR (dB) 3 RL = 1k
Ω
60 –60 50 –70 HARMONIC DISTORTION (dBc) 40 HD2 RL = 1k
Ω
–80 30 –90
03692-020
20
03692-023
0 50 100 150 200 250 300 350 400 1 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz)
Figure 22. Harmonic Distortion vs. Frequency at Maximum Gain, Figure 25. Power Supply Rejection Ratio vs. Frequency at Maximum Gain VOUT = 2 V p-p Composite Differential
120 80 0 FORWARD TRANSMISSION, HG0 100 60 –20 FORWARD TRANSMISSION, LG0 ) 80 ) –40
Ω
40
Ω
60 20 –60 RESISTANCE ( ISOLATION (dB) 40 0 REACTANCE (j –80 16 DIFFERENT GAIN 20 CODES REPRESENTED –20 –100 FORWARD TRANSMISSION, PWUP LOW R+jX FORMAT REVERSE TRANSMISSION, HG127 0 –40
03692-021
–120
03692-024
0 100 200 300 400 500 600 700 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz)
Figure 23. Output Resistance and Reactance vs. Frequency Figure 26. Various Forms of Isolation vs. Frequency
860 1400 RL = 1k
Ω
840 1300 HIGH GAIN MODE 820 1200 800 1100 780 1000 RL = 100
Ω
760 900 GROUP DELAY (ps) LOW GAIN MODE GROUP DELAY (ps) 740 800 720 700 700
03692-022
600
03692-025
0 10 20 30 40 50 60 70 80 90 100 110 120 130 0 100 200 300 400 500 600 700 800 900 GAIN CODE FREQUENCY (MHz)
Figure 24. Group Delay vs. Gain Code at 70 MHz Figure 27. Group Delay vs. Frequency at Maximum Gain Rev. B | Page 10 of 28 Document Outline Features Applications General Description Functional Block Diagram Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Block Architecture Preamplifier Transconductance Stage Output Amplifier Digital Interface and Timing Applications Basic Connections Gain Codes Power-Up Feature Choosing Between Gain Ranges Layout and Operating Considerations Package Considerations Single-Ended-to-Differential Conversion DC-Coupled Operation ADC Interfacing 3 V Operation Evaluation Board and Software Appendix Characterization Equipment Composite Waveform Assumption Definitions of Selected Parameters Outline Dimensions Ordering Guide
Ω
100 –20 HD3 RL = 100
Ω
90 –30 80 –40 70 –50 HD PSRR (dB) 3 RL = 1k
Ω
60 –60 50 –70 HARMONIC DISTORTION (dBc) 40 HD2 RL = 1k
Ω
–80 30 –90
03692-020
20
03692-023
0 50 100 150 200 250 300 350 400 1 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz)
Figure 22. Harmonic Distortion vs. Frequency at Maximum Gain, Figure 25. Power Supply Rejection Ratio vs. Frequency at Maximum Gain VOUT = 2 V p-p Composite Differential
120 80 0 FORWARD TRANSMISSION, HG0 100 60 –20 FORWARD TRANSMISSION, LG0 ) 80 ) –40
Ω
40
Ω
60 20 –60 RESISTANCE ( ISOLATION (dB) 40 0 REACTANCE (j –80 16 DIFFERENT GAIN 20 CODES REPRESENTED –20 –100 FORWARD TRANSMISSION, PWUP LOW R+jX FORMAT REVERSE TRANSMISSION, HG127 0 –40
03692-021
–120
03692-024
0 100 200 300 400 500 600 700 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz)
Figure 23. Output Resistance and Reactance vs. Frequency Figure 26. Various Forms of Isolation vs. Frequency
860 1400 RL = 1k
Ω
840 1300 HIGH GAIN MODE 820 1200 800 1100 780 1000 RL = 100
Ω
760 900 GROUP DELAY (ps) LOW GAIN MODE GROUP DELAY (ps) 740 800 720 700 700
03692-022
600
03692-025
0 10 20 30 40 50 60 70 80 90 100 110 120 130 0 100 200 300 400 500 600 700 800 900 GAIN CODE FREQUENCY (MHz)
Figure 24. Group Delay vs. Gain Code at 70 MHz Figure 27. Group Delay vs. Frequency at Maximum Gain Rev. B | Page 10 of 28 Document Outline Features Applications General Description Functional Block Diagram Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Block Architecture Preamplifier Transconductance Stage Output Amplifier Digital Interface and Timing Applications Basic Connections Gain Codes Power-Up Feature Choosing Between Gain Ranges Layout and Operating Considerations Package Considerations Single-Ended-to-Differential Conversion DC-Coupled Operation ADC Interfacing 3 V Operation Evaluation Board and Software Appendix Characterization Equipment Composite Waveform Assumption Definitions of Selected Parameters Outline Dimensions Ordering Guide