AD8432 Analog Devices, AD8432 Datasheet
AD8432
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AD8432 Summary of contents
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... I/Q demodulator signals. The AD8432 operates on a single supply mA available × 4 mm, 24-lead LFSCP. The LFCSP features an exposed paddle that provides a low thermal resistance path to the PCB, which enables more efficient heat transfer and increases reliability. The operating temperature range is − ...
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... AD8432 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 Maximum Power Dissipation ..................................................... 5 ESD Caution .................................................................................. 5 Pin Configuration and Function Descriptions ............................. 6 Typical Performance Characteristics ............................................. 7 Test Circuits ..................................................................................... 16 Theory of Operation ...................................................................... 18 Low Noise Amplifier (LNA) ..................................................... 18 REVISION HISTORY 3/11— ...
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... AD8432 Unit MHz MHz MHz MHz MHz V/µs V/µs ns nV/√Hz pA/√ nV/√Hz nV/√Hz nV/√Hz nV/√Hz dBc dBc dBc dBc dBc ...
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... AD8432 Parameter Two-Tone IMD3 Distortion 10 MHz 1 MHz Input 1dB Compression Point Output Third-Order Intercept 1 MHz 10 MHz 1 MHz 10 MHz Crosstalk DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift INPUT CHARACTERISTICS Input Voltage Range Input Resistance Input Capacitance Input Common-Mode Voltage OUTPUT CHARACTERISTCS ...
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... LFCSP 57.9 11.2 1 4-layer JEDEC board (2S2P). MAXIMUM POWER DISSIPATION The maximum safe power dissipation for the AD8432 is limited Rating by the associated rise in junction temperature (T approximately 150°C, which is the glass transition temperature, 5.5 V the properties of the plastic change. Even temporarily exceeding VPS ...
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... Gain Setting Pin for LNA1. 21 GOH1 Gain Setting Pin for LNA1. 22 OPH1 Noninverting Output of LNA1. 23 VPS1 5 V Supply. 24 ENB Enable. EPAD Exposed pad must be connected to ground. AD8432 TOP VIEW (Not to Scale) NOTES 1. EXPOSED PAD MUST BE CONNECTED TO GROUND. Figure 2. Pin Configuration Rev Page ...
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... 100Ω 50Ω IN – 100 FREQUENCY (MHz) Figure 7. Small Signal Frequency Response vs –6 – 24.08dB G = 21.58dB – 18.06dB G = 12.04dB – 100 FREQUENCY (MHz p-p, R OUT AD8432 21. 24. Ω IN ...
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... AD8432 –6 – 24.08dB G = 21.58dB – 18.06dB G = 12.04dB – FREQUENCY (MHz) Figure 9. Differential Gain vs. Frequency 24.08dB G = 21.58dB 18.06dB G = 12.04dB 45 0.1 1 FREQUENCY (MHz) Figure 10. Input Impedance R vs. Frequency, 50 Ω Active Termination IN 115 ...
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... Figure 19. Output Voltage Noise vs. Temperature S 1.6 1.4 1.2 1.0 0.8 0.6 0 24.08dB 0 21.58dB G = 18.06dB G = 12.04dB 0 1k 0.01 0.1 ) Figure 20. Input Voltage Noise vs. Frequency S Rev Page AD8432 – TEMPERATURE (° 24.08dB G = 21.58dB G = 18.06dB G = 12.04dB – TEMPERATURE (° 100 FREQUENCY (MHz) ...
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... AD8432 0.01 0.1 1 FREQUENCY (MHz) Figure 21. Output Voltage Noise vs. Frequency 0 LOW TONE HIGH TONE –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 1 10 FREQUENCY (MHz) Figure 22. IMD3 vs. Frequency 24.08dB G = 12.04dB ...
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... Figure 32. Harmonic Distortion at 10 MHz vs. Resistive Load (R L Rev Page AD8432 HD2, 10MHz, 2V p-p HD2, 10MHz, 1V p-p HD3, 10MHz, 2V p-p HD3, 10MHz, 1V p-p 200 400 600 800 1000 1200 1400 1600 1800 2000 R (Ω 12.04 dB HD2, 1MHz, 1V p-p ...
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... AD8432 –60 –65 –70 –75 –80 –85 –90 –95 0 200 400 600 800 1000 1200 1400 1600 1800 2000 R (Ω) L Figure 33. Harmonic Distortion at 1 MHz vs. Resistive Load ( 24.08 dB –50 –60 –70 –80 –90 –100 GAIN (V/V) Figure 34. Harmonic Distortion at 10 MHz vs. Gain – ...
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... Figure 42. Small Signal Transient Response vs. Capacitive Load (C IN Figure 43. Small Signal Transient Response vs. Resistive Load ( 15pF 10pF 5pF L ), Figure 44. Small Signal Transient Response vs. Resistive Load (R L Rev Page AD8432 C = 5pF 10pF 15pF 20pF 30pF L ...
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... AD8432 G = 18.06dB G = 12.04dB G = 21.58dB G = 24.08dB 10ns/DIV Figure 45. Small Signal Transient Response vs. Gain 24.08dB G = 21.58dB G = 18.06dB G = 12.04dB 10ns/DIV Figure 46. Large Signal Transient Response vs. Gain, V 10ns/DIV Figure 47. Large Signal Transient Response vs. Capacitive Load ( 12. 200 mV p-p Figure 48. Large Signal Transient Response vs. Capacitive Load (C ...
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... OUT 1 50mV/DIV 2 100 1 500mV/DIV 100 Rev Page –40 – TEMPERATURE (°C) ENB 5V/DIV OUTPUT TIME (100µs/DIV) Figure 55. Small Signal Enable Response ENB 5V/DIV OUTPUT TIME (100µs/DIV) Figure 56. Large Signal Enable Response AD8432 80 100 ...
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... INH OPL INL OPH AD8432 0.1µF 499Ω LNA1 0.1µF Figure 59. Frequency Response Measurements 0.1µF INH OPL 1kΩ INL OPH AD8432 AD8129 1kΩ 0.1µF LNA1 Figure 60. Voltage Noise Measurements Rev Page SPECTRUM DUAL FILTER ANALZYER HP 475Ω LP 56.2Ω AD8130 1.7MHz 50Ω ...
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... LNA1 499Ω 0.1µF 0.1µF OPL 0.1µF OPH 499Ω 5pF AD8432 LNA1 0.1µF NETWORK ANALYZER 0.1µF 50Ω OPL 0.1µF OPH 499Ω SPECTRUM ANALYZER +IN 50Ω 1kΩ OUT –IN AD8129 1kΩ AD8432 OSCILLOSCOPE CH1 5pF ...
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... The inputs must be ac-coupled through a series capacitor to maintain the dc bias level of the inputs. Likewise, the AD8432 outputs have a dc bias voltage of 2 coupling capacitor in series with each single-ended output is recommended to prevent improper loading of the outputs. The AD8432 inputs have a dc bias voltage of 3 ...
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... ACTIVE INPUT RESISTANCE MATCHING The AD8432 reduces noise and optimizes signal power transfer by using active input termination to perform signal source resistance matching. The primary purpose of input impedance matching is to optimize the input signal power transfer. With resistive termination, the ...
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... Rev Page accordingly. The R and C network presents series with ∞) is 200 MHz. The AD8432 FB (Ω), R (Ω), 1% Standard Value FB 150 226 301 619 3.57 k 250 511 357 715 453 909 (see FB Actual R (Ω), ...
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... TYPICAL SETUP The internal bias circuitry of the AD8432 sets the input bias voltage at 3.25 V and the output bias voltage at 2 important to ac couple the inputs through a capacitor to maintain the internal dc bias levels ...
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... AD8432 Table 7. External Component Selections for Common Input Impedance R (Ω) Gain (dB 100 200 Unterminated Ω Unterminated Ω (Ω) C (pF 150 ...
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... INL2 GML2 0.1µ 12dB Figure 71. Schematic of the AD8432 (G = 12.04 dB) and AD8339 Application for Ultrasound Beamforming 4LOP and 4LON pins of the AD8339, has a frequency 4× that of the RF inputs. The AD8339 downconverts the RF signals, generates quadrature, and phase-shifts the resultant I and Q or the quad AD8339 signals ...
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... INL1 0.1µ Figure 72. AD8432 Differential-to-Single-Ended Conversion Using the AD8129/AD8130 with Unity Gain A transformer or balun can also be used to convert the differential output of the AD8432 to a single-ended output. Transformers have lower distortion; however, care must be taken to properly match the impedance of the transformer. The test circuit for ...
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... EVALUATION BOARD Figure 73 shows the AD8432 evaluation board, and the schematic diagram is shown in Figure 74. Using the board is a convenient and fast way to verify system design and assess the performance of the AD8432 under user-specific operating conditions. The board provides access to all LNA inputs, outputs, and gain setting pins ...
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... AD8432 SCHEMATIC GML1 19 12 GML2 20 11 GMH1 GMH2 10 GOH1 21 GOH2 OPH1 22 9 OPH2 VPS1 23 8 VPS2 7 ENB 24 IND2 Figure 74. Schematic Rev Page 08341-042 ...
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... POWER SUPPLY The AD8432 should be powered by a single 5 V supply connected to the VPOS terminal. Separate supplies can be used for VPS1, VPS2, and ENB, or they can all be tied to VPOS by shorting the W3 and W4 headers and the S1 switch. Ferrite beads and decoupling capacitors are installed for isolation, protection, and power supply noise reduction ...
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... ORDERING GUIDE Model 1 Temperature Range AD8432ACPZ-R7 −40°C to +85°C AD8432ACPZ-RL −40°C to +85°C AD8432ACPZ-WP −40°C to +85°C AD8432-EVALZ RoHS Compliant Part. ©2009-2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 4.10 0.30 4.00 SQ 0.25 3.90 ...