Datasheet AD8370 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 750 MHz Digitally Controlled Variable Gain Amplifier |
| Pages / Page | 28 / 7 — Data Sheet. AD8370. TYPICAL PERFORMANCE CHARACTERISTICS. 40 HIGH GAIN … |
| Revision | B |
| File Format / Size | PDF / 786 Kb |
| Document Language | English |
Data Sheet. AD8370. TYPICAL PERFORMANCE CHARACTERISTICS. 40 HIGH GAIN CODES SHOWN WITH DASHED LINES
Model Line for this Datasheet
Text Version of Document
Data Sheet AD8370 TYPICAL PERFORMANCE CHARACTERISTICS
VS = 5 V, ZS = 200 Ω, ZL = 100 Ω, T = 25°C, unless otherwise noted.
70 40 40 HIGH GAIN CODES SHOWN WITH DASHED LINES CODE = LAST 7 BITS OF GAIN CODE (NO MSB) 35 HG127 60 30 HG77 HIGH GAIN MODE 30 HG102 HG51 50 20 25 LG127 HG25 LOW GAIN MODE 20 40 10
∆
GAIN
≅
LG90
∆
0.409 15 CODE HIGH GAIN MODE HG9 HG18 30 0 10 LG36 VOLTAGE GAIN (V/V) VOLTAGE GAIN (dB) VOLTAGE GAIN (dB) 5 20 –10 HG3 0
∆
GAIN 10
≅
0.059 –20
∆
CODE LG9 LG18 LOW GAIN MODE –5 LOW GAIN CODES SHOWN WITH SOLID LINES 0 –30
03692-004
–10
03692-007
0 10 20 30 40 50 60 70 80 90 100 110 120 130 10 100 1000 GAIN CODE FREQUENCY (MHz)
Figure 4. Gain vs. Gain Code at 70 MHz Figure 7. Frequency Response vs. Gain Code
40 30 40 50 HIGH GAIN MODE +25
°
C UNIT CONVERSION NOTE FOR 100
Ω
LOAD: dBVrms = dBm–10dB 35 25 35 45
°
C LOW GAIN MODE
°
C 30 20 30 40
°
C, +85 +85
°
C –40 25 15 25 35 20 10 20 30 OUTPUT IP3 (dBm) 15 5 OUTPUT IP3 (dBV rms) OUTPUT IP3 (dBm) +25 –40
°
C OUTPUT IP3 (dBm) 15 25 SHADING INDICATES ±3
σ
FROM THE SHADING INDICATES ±3
σ
FROM THE 10 0 MEAN. DATA BASED ON 30 PARTS MEAN. DATA BASED ON 30 PARTS FROM TWO BATCH LOTS. FROM TWO BATCH LOTS. 10 20
03692-069
5 –5
03692-068
0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 120 140 FREQUENCY (MHz) GAIN CODE
Figure 5. Output Third-Order Intercept vs. Gain Code at 70 MHz Figure 8. Output Third-Order Intercept vs. Frequency at Maximum Gain
25 45 40 20 35 LG127 30 15 380MHz 25 LOW GAIN MODE 10 HG18 20 70MHz NOISE FIGURE (dB) NOISE FIGURE (dB) 15 HG127 5 380MHz 10 HIGH GAIN MODE 70MHz
03692-009
5
03692-006
0 0 20 40 60 80 100 120 140 0 100 200 300 400 500 600 FREQUENCY (MHz) GAIN CODE
Figure 6. Noise Figure vs. Gain Code at 70 MHz Figure 9. Noise Figure vs. Frequency at Various Gains Rev. B | Page 7 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
VS = 5 V, ZS = 200 Ω, ZL = 100 Ω, T = 25°C, unless otherwise noted.
70 40 40 HIGH GAIN CODES SHOWN WITH DASHED LINES CODE = LAST 7 BITS OF GAIN CODE (NO MSB) 35 HG127 60 30 HG77 HIGH GAIN MODE 30 HG102 HG51 50 20 25 LG127 HG25 LOW GAIN MODE 20 40 10
∆
GAIN
≅
LG90
∆
0.409 15 CODE HIGH GAIN MODE HG9 HG18 30 0 10 LG36 VOLTAGE GAIN (V/V) VOLTAGE GAIN (dB) VOLTAGE GAIN (dB) 5 20 –10 HG3 0
∆
GAIN 10
≅
0.059 –20
∆
CODE LG9 LG18 LOW GAIN MODE –5 LOW GAIN CODES SHOWN WITH SOLID LINES 0 –30
03692-004
–10
03692-007
0 10 20 30 40 50 60 70 80 90 100 110 120 130 10 100 1000 GAIN CODE FREQUENCY (MHz)
Figure 4. Gain vs. Gain Code at 70 MHz Figure 7. Frequency Response vs. Gain Code
40 30 40 50 HIGH GAIN MODE +25
°
C UNIT CONVERSION NOTE FOR 100
Ω
LOAD: dBVrms = dBm–10dB 35 25 35 45
°
C LOW GAIN MODE
°
C 30 20 30 40
°
C, +85 +85
°
C –40 25 15 25 35 20 10 20 30 OUTPUT IP3 (dBm) 15 5 OUTPUT IP3 (dBV rms) OUTPUT IP3 (dBm) +25 –40
°
C OUTPUT IP3 (dBm) 15 25 SHADING INDICATES ±3
σ
FROM THE SHADING INDICATES ±3
σ
FROM THE 10 0 MEAN. DATA BASED ON 30 PARTS MEAN. DATA BASED ON 30 PARTS FROM TWO BATCH LOTS. FROM TWO BATCH LOTS. 10 20
03692-069
5 –5
03692-068
0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 120 140 FREQUENCY (MHz) GAIN CODE
Figure 5. Output Third-Order Intercept vs. Gain Code at 70 MHz Figure 8. Output Third-Order Intercept vs. Frequency at Maximum Gain
25 45 40 20 35 LG127 30 15 380MHz 25 LOW GAIN MODE 10 HG18 20 70MHz NOISE FIGURE (dB) NOISE FIGURE (dB) 15 HG127 5 380MHz 10 HIGH GAIN MODE 70MHz
03692-009
5
03692-006
0 0 20 40 60 80 100 120 140 0 100 200 300 400 500 600 FREQUENCY (MHz) GAIN CODE
Figure 6. Noise Figure vs. Gain Code at 70 MHz Figure 9. Noise Figure vs. Frequency at Various Gains Rev. B | Page 7 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
