AD8432ACPZ-WP

FEATURES FUNCTIONAL BLOCK DIAGRAM ENB Low noise Input voltage noise: 0.85 nV/√Hz Current noise: 2.0 pA/√Hz High speed 200 MHz bandwidth (G = 12.04 dB) 295 V/μs slew rate Selectable gain G = 12.04 dB (×4) G = 18.06 dB (×8) G = 21.58 dB (×12) G = 24.08 dB (×16) Active input impedance matching Integrated input clamp diodes Single-ended input, differential output Supply range: 4.5 V to 5.5 V Low power: 60 mW/channel VPS1 VPS2 COMM BIAS AD8432 INH1 IND1 OPH1 LNA1 GMH1 GOH1 GOL1 GML1 INL1 INH2 IND2 OPL1 OPH2 LNA2 OPL2 GMH2 GOH2 GOL2 GML2 INL2 08341-001 Data Sheet Dual-Channel Ultralow Noise Amplifier with Selectable Gain and Input Impedance AD8432 Figure 1. APPLICATIONS CW Doppler ultrasound front ends Low noise preamplification Predriver for I/Q demodulators and phase shifters Wideband analog-to-digital drivers GENERAL DESCRIPTION The AD8432 is a dual-channel, low power, ultralow noise amplifier with selectable gain and active impedance matching. Each channel has a single-ended input, differential output, and integrated input clamps. By pin strapping the gain setting pins, four accurate gains of G = 12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB (×4, ×8, ×12, and ×16, respectively) are possible. A bandwidth of 200 MHz at G = 12.04 dB makes this amplifier well suited for many high speed applications. The exceptional noise performance of the AD8432 is made possible by the active impedance matching. Using a feedback network, the input impedance of the amplifiers can be adjusted to match the signal source impedance without compromising the noise performance. Impedance matching and low noise in the AD8432 allow designers to create wider dynamic range systems that are able to detect even very low level signals. Rev. D The AD8432 achieves 0.85 nV/√Hz input-referred voltage noise for a gain of 12.04 dB. The AD8432’s ultralow noise, low distortion, gain accuracy, and channel-to-channel matching are ideal for high performance ultrasound systems and for processing I/Q demodulator signals. The AD8432 operates on a single supply of 5 V at 24 mA. It is available in a 4 mm × 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 −40°C to +85°C. Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2009–2017 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD8432 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Theory of Operation ...................................................................... 18  Applications ....................................................................................... 1  Low Noise Amplifier (LNA) ..................................................... 18  Functional Block Diagram .............................................................. 1  Gain Setting Technique ............................................................. 18  General Description ......................................................................... 1  Active Input Resistance Matching............................................ 19  Revision History ............................................................................... 2  Applications Information .............................................................. 21  Specifications..................................................................................... 3  Typical Setup ............................................................................... 21  Absolute Maximum Ratings............................................................ 5  I/Q Demodulation Front End ................................................... 23  Thermal Resistance ...................................................................... 5  Differential-to-Single-Ended Conversion............................... 24  Maximum Power Dissipation ..................................................... 5  Evaluation Board ............................................................................ 25  ESD Caution .................................................................................. 5  Connection and Operation ....................................................... 25  Pin Configuration and Function Descriptions ............................. 6  Schematic..................................................................................... 28  Typical Performance Characteristics ............................................. 7  Outline Dimensions ....................................................................... 29  Test Circuits ..................................................................................... 16  Ordering Guide .......................................................................... 29  REVISION HISTORY 3/2017—Rev. C to Rev. D Changed CP-24-7 to CP-24-15 .................................... Throughout Changes to Outline Dimensions................................................... 29 Changes to Ordering Guide .......................................................... 29 7/2012—Rev. B to Rev. C Changes to Figure 1 .......................................................................... 1 Changes to Figure 65 ...................................................................... 18 Change to Figure 69 ....................................................................... 21 Changes to Table 7 .......................................................................... 22 Deleted Gain Settings Section and Table 8.................................. 25 Changes to Evaluation Board Section and Figure 73; Added Connection and Operation Section and Table 8 ........................ 25 Added Figure 74 to Figure 78, Renumbered Sequentially ........ 26 Added Figure 79.............................................................................. 27 Changes to Figure 80 ...................................................................... 28 Updated Outline Dimensions ....................................................... 29 3/2011—Rev. A to Rev. B Changes to Format ......................................................................... 21 2/2010—Rev. 0 to Rev. A Changes to General Description .....................................................1 Changes to Figure 5, Figure 6, Figure 7, Figure 8..........................7 Added Figure 27, Figure 29, and Figure 31, Renumbered Sequentially ..................................................................................... 11 Added Figure 33 and Figure 35 .................................................... 12 Changes to Figure 58...................................................................... 16 10/2009—Revision 0: Initial Version Rev. D | Page 2 of 32 Data Sheet AD8432 SPECIFICATIONS VS = 5 V, TA = 25°C, RS = RIN = 50 Ω, RFB =150 Ω, CSH = 47 pF, RSH = 15 Ω, RL = 500 Ω (per SE output), CL = 5 pF (per SE output), G = 12.04 dB (single-ended input to differential output), f = 1 MHz, unless otherwise specified. Table 1. Parameter DYNAMIC PERFORMANCE Gain Range Gain Error −3 dB Small Signal Bandwidth −3 dB Large Signal Bandwidth Slew Rate (Rising Edge) Slew Rate (Falling Edge) Overdrive Recovery Time DISTORTION/NOISE PERFORMANCE Input Voltage Noise Input Current Noise Noise Figure Unterminated Active Termination Output Referred Noise Harmonic Distortion 1 MHz (VOUT = 1 V p-p) 1 MHz (VOUT = 2 V p-p) 10 MHz (VOUT = 1 V p-p) 10 MHz (VOUT = 2 V p-p) Conditions Min Input to differential output (selectable gain) Input to single output (selectable gain) 12.04 6.02 RIN unterminated, RFB = ∞, CSH = 0 pF, RSH = 0 Ω G = 12.04 dB G = 18.06 dB G = 21.58 dB G = 24.08 dB VOUT = 2 V p-p VOUT = 2 V p-p, f = 10 MHz VOUT = 2 V p-p, f = 10 MHz Typ Max Unit 0.1 24.08 18.06 1 dB dB dB 200 90 50 32 42 295 170 10 MHz MHz MHz MHz MHz V/μs V/μs ns RFB = ∞ RFB = ∞ 0.85 2.0 nV/√Hz pA/√Hz RS = 50 Ω, RFB = ∞ RS = RIN = 50 Ω, RFB = 150 Ω RS = 50 Ω, RFB = 226 Ω, RIN = 75 Ω RS = 50 Ω, RFB = 301 Ω, RIN = 100 Ω RS = 50 Ω, RFB = 619 Ω, RIN = 200 Ω RS = 50 Ω, RFB = 3.57 kΩ, RIN = 1 kΩ G = 12.04 dB, RFB = ∞ G = 18.06 dB, RFB = ∞ G = 21.58 dB, RFB = ∞ G = 24.08 dB, RFB = ∞ 2.8 4.8 4.2 3.2 2.1 2.3 3.4 6.8 10.2 13.6 dB dB dB dB dB dB nV/√Hz nV/√Hz nV/√Hz nV/√Hz HD2 HD2, RS = 50 Ω, RIN unterminated HD3 HD3, RS = 50 Ω, RIN unterminated HD2 HD2, RS = 50 Ω, RIN unterminated HD3 HD3, RS = 50 Ω, RIN unterminated HD2 HD2, RS = 50 Ω, RIN unterminated HD3 HD3, RS = 50 Ω, RIN unterminated HD2 HD2, RS = 50 Ω, RIN unterminated HD3 HD3, RS = 50 Ω, RIN unterminated −67 −74 −103 −106 −65 −72 −103 −92 −66 −62 −78 −73 −60 −56 −72 −65 dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc Rev. D | Page 3 of 32 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 Output Common-Mode Voltage Output Offset Voltage Output Voltage Swing Output Resistance Output Resistance in Shutdown Mode Output Short-Circuit Current Enable Response Time POWER SUPPLY Supply Voltage Quiescent Current Over Temperature Supply Current in Shutdown Mode Power Dissipation PSRR Data Sheet Conditions RS = 50 Ω, RIN unterminated VOUT = 1 V p-p, f1 = 9.5 MHz, f2 = 10.5 MHz VOUT = 2 V p-p, f1 = 9.5 MHz, f2 = 10.5 MHz VOUT = 1 V p-p, f1 = 0.9 MHz, f2 = 1.1 MHz VOUT = 2 V p-p, f1 = 0.9 MHz, f2 = 1.1 MHz f = 1 MHz f = 10 MHz Min VOUT = 1 V p-p of composite tones VOUT = 2 V p-p of composite tones VOUT = 1 V p-p of composite tones VOUT = 2 V p-p of composite tones VOUT = 1 V p-p of composite tones, reference to 50 Ω VOUT = 2 V p-p of composite tones, reference to 50 Ω VOUT = 1 V p-p of composite tones, reference to 50 Ω VOUT = 2 V p-p of composite tones, reference to 50 Ω VOUT = 1 V p-p, f = 1 MHz −6.25 AC-coupled RFB = 150 Ω RFB = 226 Ω RFB = 301 Ω RFB = 619 Ω RFB = 3.57 kΩ RFB = ∞, f = 100 kHz Single-ended, either output Single-ended, either output RL = 10 Ω differential ENBON (enable high to output on) ENBOFF (enable low to output off ) 4.5 G = 24.08 dB, f = 100 kHz, no bypass capacitors Rev. D | Page 4 of 32 Max Unit −89.1 −66.0 −88.9 −73.7 7.5 7.7 dBc dBc dBc dBc dBm dBm 29.7 28.2 23.2 24.2 42.7 41.2 36.2 37.2 102 dBV rms dBV rms dBV rms dBV rms dBm dBm dBm dBm dB +1 300 +6.25 1.2 50 75 100 200 1 6.2 6 3.25 −25 ENB = 5 V TA = −40°C TA = +85°C ENB = GND Typ 2.5 +4 4.8