Analog Devices AD604 - Manuals

Analog Devices AD604 – Manual in PDF format online.

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Manual

Manual Analog Devices AD604

Summary

Page 2 - TABLE OF CONTENTS; REVISION HISTORY

AD604 Rev. E | Page 2 of 32 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram ...................

Page 3 - SPECIFICATIONS; Each amplifier channel at T

AD604 Rev. E | Page 3 of 32 SPECIFICATIONS Each amplifier channel at T A = 25°C, V S = ±5 V, R S = 50 Ω, R L = 500 Ω, C L = 5 pF, V REF = 2.50 V (scaling = 20 dB/V), 0 dB to 48 dB gain range (preamplifier gain = 14 dB), VOCM = 2.5 V, C1 and C2 = 0.1 μF (see Figure 37), unless otherwise noted. Table ...

Page 5 - ABSOLUTE MAXIMUM RATINGS; Parameter; When driven from an external low impedance source.; ESD CAUTION

AD604 Rev. E | Page 5 of 32 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter 1 , 2 Rating Supply Voltage ±V S Pin 17 to Pin 20 (with Pin 16, Pin 22 = 0 V ) ±6.5 V Input Voltages Pin 1, Pin 2, Pin 11, Pin 12 VPOS/2 ± 2 V continuous Pin 4, Pin 9 ±2 V Pin 5, Pin 8 VPOS, VNEG Pin 6, Pin 7, Pin 13, Pin 14, Pi...

Page 6 - PIN CONFIGURATION AND FUNCTION DESCRIPTIONS; Figure 2. Pin Configuration; Table 3. Pin Function Descriptions

AD604 Rev. E | Page 6 of 32 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS –DSX1 1 +DSX1 2 PAO1 3 FBK1 4 VGN1 24 VREF 23 OUT1 22 GND1 21 PAI1 5 COM1 6 COM2 7 VPOS 20 VNEG 19 VNEG 18 PAI2 8 VPOS 17 FBK2 9 GND2 16 PAO2 10 OUT2 15 +DSX2 11 VOCM 14 –DSX2 12 VGN2 13 AD604 TOP VIEW (Not to Scale) 00 54 0- 0 ...

Page 7 - TYPICAL PERFORMANCE CHARACTERISTICS; Figure 3. Gain vs. VGN for Three Temperatures

AD604 Rev. E | Page 7 of 32 VGN (V) –10 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, G (preamplifier) = 14 dB, VREF = 2.5 V (20 dB/V scaling), f = 1 MHz, R L = 500 Ω, C L = 5 pF, T A = 25°C, and V SS = ±5 V. GA IN S C A L IN G ( d B /V ) 40.0 37.5 32.5 30.0 25.0 20.0 22.5 27.5 35.0 50...

Page 8 - Figure 13. Output Offset vs. VGN for Three Temperatures

AD604 Rev. E | Page 8 of 32 VGN (V) G AI N E RRO R ( d B) 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 FREQUENCY (Hz) GA IN ( d B ) 50 40 –50 30 20 10 0 –10 –20 –30 –40 100k 1M 10M 100M 0.2 0.7 1.2 1.7 2.2 2.7 20dB/V VREF = 2.5V 30dB/V VREF = 1.67V 00 54 0- 00 9 Figure 9. Gain Error vs. VGN for Two Gain Sc...

Page 10 - Figure 21. Harmonic Distortion vs. Frequency; Figure 24. Intermodulation Distortion

AD604 Rev. E | Page 10 of 3 –20 2 FREQUENCY (Hz) HARM O NI C DI S T O R T IO N ( d Bc) –40 –50 –70 –60 –45 –55 –65 100k 1M 10M 100M V O = 1V p-p VGN = 1V HD3 HD2 00 54 0- 0 2 1 Figure 21. Harmonic Distortion vs. Frequency VGN (V) H A R M ON IC D IS T OR TION ( d B c) –30 –60 –80 –40 –50 –70 –35 –65 ...

Page 11 - Figure 27. Large Signal Pulse Response; Figure 28. Small Signal Pulse Response; Figure 30. Gain Response

AD604 Rev. E | Page 11 of 32 100ns/DIV 40 0mV /DI V 2V –2V 253ns 1.253µs V O = 2V p-p VGN = 1.5V 00 54 0- 0 27 Figure 27. Large Signal Pulse Response 100ns/DIV 40m V /D IV 200 –200 253ns 1.253µs V O = 200mV p-p VGN = 1.5V TRIG'D 00 54 0- 0 28 Figure 28. Small Signal Pulse Response 10 0% 100 90 2.9V ...

Page 13 - THEORY OF OPERATION; A gain control block.

AD604 Rev. E | Page 13 of 32 THEORY OF OPERATION The AD604 is a dual-channel VGA with an ultralow noise preamplifier. Figure 37 shows the simplified block diagram of one channel. Each identical channel consists of a preamplifier with gain setting resistors (R5, R6, and R7) and a single-supply X-AMP®...

Page 14 - PREAMPLIFIER; where it is assumed that R; Figure 38. Preamplifier Gain Programmability; of 40 Ω should be

AD604 Rev. E | Page 14 of 32 PREAMPLIFIER The input capability of the following single-supply DSX (2.5 ± 2 V for a +5 V supply) limits the maximum input voltage of the preamplifier to ±400 mV for the 14 dB gain configuration or ±200 mV for the 20 dB gain configuration. The preamplifier gain can be p...

Page 15 - Figure 40. Shutdown of Preamplifiers Only

AD604 Rev. E | Page 15 of 32 12 11 10 A unique circuit technique is used to interpolate continuously among the tap points, thereby providing continuous attenuation from 0 dB to −48.36 dB. The ladder network, together with the interpolation mechanism, can be considered a voltage-controlled potentiome...

Page 18 - APPLICATIONS INFORMATION; Figure 43. Basic Connections for a Single Channel

AD604 Rev. E | Page 18 of 32 12 APPLICATIONS INFORMATION The basic circuit in Figure 43 shows the connections for one channel of the AD604. The signal is applied at Pin 5. RGN is normally 0, in which case the preamplifier is set to a gain of 5 (14 dB). When FBK1 is left open, the preamplifier is set...

Page 19 - Figure 44. AGC Amplifier with 82 dB of Gain Range

AD604 Rev. E | Page 19 of 32 VG 13 16 15 14 19 18 17 24 23 22 21 20 12 11 10 9 8 1 2 3 4 7 6 5 AD604 –5V +5V VREF RF OUT –5V +5V 8 7 6 5 1 2 3 4 AD711 NC OUT AD835 +5V –5V –5V +5V 2 VSET (<0V) –DSX1 +DSX1 PAI1 FBK1 PAO1 COM1 COM2 PAI2 FBK2 PAO2 +DSX2 –DSX2 VGN1 VREF VPOS GND1 OUT1 VNEG VNEG VPOS ...

Page 21 - Figure 51. Output of VGA in Figure 50 for VGN = 1 V

AD604 Rev. E | Page 21 of 3 At 1 MHz, the attenuation is about −0.2 dB, increasing to −6 dB at 10 MHz and −28 dB at 100 MHz. Signals less than approximately 1 MHz are not significantly affected. 2 Figure 49 shows the control voltage vs. the input power at 1 MHz to the circuit shown in Figure 48; not...

Page 22 - Figure 52. TGC Circuit for Medical Ultrasound Application

AD604 Rev. E | Page 22 of 32 MEDICAL ULTRASOUND TGC DRIVING THE AD9050, A 10-BIT, 40 MSPS ADC The AD604 is an ideal candidate for the time gain control (TGC) amplifier that is required in medical ultrasound systems to limit the dynamic range of the signal that is presented to the ADC. Figure 52 show...

Page 24 - EVALUATION BOARD; Figure 56. AD604 Evaluation Board—Component Side Silk Screen; DSX INPUT CONNECTIONS; Differential DSX Inputs; Figure 55. AD604 Evaluation Board Assembly; USING THE PREAMPLIFIER

AD604 Rev. E | Page 24 of 3 EVALUATION BOARD 2 Figure 55 is a photograph of the AD604 evaluation board assembly. Multiple input connections, test points, jumper selectable options, and on-board trims offer convenience when configuring the AD604 in various operating modes. The evaluation board requir...

Page 25 - PREAMPLIFIER GAIN; Table 4. Trimmer Functions

AD604 Rev. E | Page 25 of 32 Connecting the DSX Inputs to the Preamplifiers To connect the DSX inputs to the preamplifiers, install jumpers in the JP6 lower position and in JP15. Verify that the jumpers in JP13 and JP14 are removed. Cascaded DSX To channel-cascade the two channels, insert a jumper i...

Page 26 - EVALUATION BOARD ARTWORK AND SCHEMATIC; Figure 59. Internal Ground Plane

AD604 Rev. E | Page 26 of 3 0- 0 57 2 EVALUATION BOARD ARTWORK AND SCHEMATIC 00 54 0- 0 59 Figure 59. Internal Ground Plane 00 54 00 54 Figure 57. Component Side Copper 00 54 0- 05 8 Figure 58. Secondary Side Copper 0- 0 60 Figure 60. Internal Power Plane www.BDTIC.com/ADI

Page 27 - Figure 61. Evaluation Board Schematic; Table 6. Bill of Materials

AD604 Rev. E | Page 27 of 32 R12 –DSX1 PAO1 OUT1 VREF VGN1 +DSX1 15 4 3 2 1 13 14 16 17 18 19 20 10 7 9 8 6 5 C8 0.1µF C9 0.1µF C7 0.1µF C14 0.1µF C13 0.1µF C2 0.1µF C4 0.1µF C6 0.1µF 12 11 24 23 22 21 FBK1 PAI1 COM1 COM2 PAO2 +DSX2 FBK2 PAI2 OUT2 VGN2 VOCM GND2 VPOS VNEG GND1 VNEG AD604 U1 R5 JP7 R...

Page 28 - OUTLINE DIMENSIONS; Narrow Body

AD604 Rev. E | Page 28 of 32 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. COMPLIANT TO JEDEC STANDARDS MS-001 07 10 06...

Page 29 - Dimensions shown in millimeters; ORDERING GUIDE; Model; Evaluation

AD604 Rev. E | Page 29 of 32 COMPLIANT TO JEDEC STANDARDS MO-150-AG 06 01 06 -A 24 13 12 1 8.508.207.90 8.207.807.40 5.605.305.00 SEATING PLANE 0.05 MIN 0.65 BSC 2.00 MAX 0.380.22 COPLANARITY 0.10 1.851.751.65 0.250.09 0.950.750.55 8°4°0° Figure 64. 24-Lead Shrink Small Outline Package [SSOP] (RS-24...

Page 30 - NOTES

AD604 Rev. E | Page 30 of 32 NOTES www.BDTIC.com/ADI