AD604ARSZ Analog Devices Inc, AD604ARSZ Datasheet

IC AMP VGA DUAL ULN 40MA 24SSOP

AD604ARSZ

Manufacturer Part Number
AD604ARSZ
Description
IC AMP VGA DUAL ULN 40MA 24SSOP
Manufacturer
Analog Devices Inc
Series
X-AMP®r
Datasheet

Specifications of AD604ARSZ

Amplifier Type
Variable Gain
Number Of Circuits
2
Slew Rate
170 V/µs
-3db Bandwidth
40MHz
Current - Input Bias
400nA
Current - Supply
32mA
Current - Output / Channel
40mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SSOP
No. Of Amplifiers
1
Bandwidth
40MHz
Gain Accuracy
1.2dB
No. Of Channels
2
Supply Voltage Range
± 5V
Amplifier Case Style
SSOP
No. Of Pins
24
Operating Temperature Range
-40°C To +85°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AD604-EVALZ - BOARD EVAL FOR AD604 AMP
Output Type
-
Voltage - Supply, Single/dual (±)
-
Gain Bandwidth Product
-
Voltage - Input Offset
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD604ARSZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
FEATURES
Ultralow input noise at maximum gain
2 independent linear-in-dB channels
Absolute gain range per channel programmable
±1.0 dB gain accuracy
Bandwidth: 40 MHz (−3 dB)
Input resistance: 300 kΩ
Variable gain scaling: 20 dB/V through 40 dB/V
Stable gain with temperature and supply variations
Single-ended unipolar gain control
Power shutdown at lower end of gain control
Drive ADCs directly
APPLICATIONS
Ultrasound and sonar time-gain controls
High performance AGC systems
Signal measurement
GENERAL DESCRIPTION
The AD604 is an ultralow noise, very accurate, dual-channel,
linear-in-dB variable gain amplifier (VGA) optimized for time-
based variable gain control in ultrasound applications; however,
it supports any application requiring low noise, wide bandwidth,
variable gain control. Each channel of the AD604 provides a
300 kΩ input resistance and unipolar gain control for ease of
use. User-determined gain ranges, gain scaling (dB/V), and dc
level shifting of output further optimize performance.
Each channel of the AD604 uses a high performance
preamplifier that provides an input-referred noise voltage of
0.8 nV/√Hz. The very accurate linear-in-dB response of the
AD604 is achieved with the differential input exponential
amplifier (DSX-AMP) architecture. Each DSX-AMP comprises
a variable attenuator of 0 dB to 48.36 dB followed by a high
speed fixed-gain amplifier. The attenuator is a 7-stage
R-1.5R ladder network. The attenuation between tap points is
6.908 dB and 48.36 dB for the ladder network.
The equation for the linear-in-dB gain response is
G (dB) =
(Gain Scaling (dB/V) × VGN (V)) + (Preamp Gain (dB) – 19 dB)
Rev. G
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.
0.80 nV/√Hz, 3.0 pA/√Hz
0 dB to 48 dB (preamplifier gain = 14 dB) through 6 dB to
54 dB (preamplifier gain = 20 dB)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
PAIx
Preamplifier gains between 5 and 10 (14 dB and 20 dB) provide
overall gain ranges per channel of 0 dB through 48 dB and 6 dB
through 54 dB. The two channels of the AD604 can be cascaded
to provide greater levels of gain range by bypassing the preamplifier
of the second channel. However, in multiple channel systems,
cascading the AD604 with other devices in the AD60x VGA
family that do not include a preamplifier may provide a more
efficient solution. The AD604 provides access to the output of
the preamplifier, allowing for external filtering between the
preamplifier and the differential attenuator stage.
Note that scale factors up to 40 dB/V are achievable with reduced
accuracy for scales above 30 dB/V. The gain scales linearly in
decibels with control voltages of 0.4 V to 2.4 V with the 20 dB/V
scale. Below and above this gain control range, the gain begins
to deviate from the ideal linear-in-dB control law. The gain
control region below 0.1 V is not used for gain control. When
the gain control voltage is <50 mV, the amplifier channel is
powered down to 1.9 mA.
The AD604 is available in 24-lead SSOP, SOIC, and PDIP
packages and is guaranteed for operation over the −40°C to
+85°C temperature range.
AD604
FUNCTIONAL BLOCK DIAGRAM
PAOx
COMx
Variable Gain Amplifier
40Ω
32Ω
8Ω
©1996–2010 Analog Devices, Inc. All rights reserved.
FBKx
Dual, Ultralow Noise
–DSXx
0dB TO –48.4dB
PASSIVE INPUT
DIFFERENTIAL
ATTENUATOR
NETWORK
LADDER
R-1.5R
Figure 1.
+DSXx
GAIN CONTROL
AND SCALING
AFA
FIXED GAIN
AMPLIFIER
www.analog.com
VGNx
34.4dB
AD604
VREF
OUTx
VOCM

Related parts for AD604ARSZ

AD604ARSZ Summary of contents

Page 1

FEATURES Ultralow input noise at maximum gain 0.80 nV/√Hz, 3.0 pA/√Hz 2 independent linear-in-dB channels Absolute gain range per channel programmable (preamplifier gain = 14 dB) through (preamplifier gain = ...

Page 2

AD604 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 Pin Configuration and Function Descriptions ...

Page 3

SPECIFICATIONS Each amplifier channel 25° range (preamplifier gain = 14 dB), VOCM = 2 and C2 = 0.1 μF (see Figure 37), unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Preamplifier Input ...

Page 4

AD604 Parameter ACCURACY Absolute Gain Error Gain Scaling Error Output Offset Voltage Output Offset Variation GAIN CONTROL INTERFACE Gain Scaling Factor Gain Range Input Voltage ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table Parameter Supply Voltage ±V S Pin 17 to Pin 20 (with Pin 16, Pin Input Voltages Pin 1, Pin 2, Pin 11, Pin 12 Pin 4, Pin 9 Pin ...

Page 6

AD604 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 –DSX1 Channel 1 Negative Signal Input to DSX1. 2 +DSX1 Channel 1 Positive Signal Input to DSX1. 3 PAO1 Channel 1 Preamplifier Output. 4 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, G (preamplifier dB, VREF = 2.5 V (20 dB/V scaling MHz ± –10 0.1 0.5 0.9 1.3 1.7 ...

Page 8

AD604 2.0 1.5 1.0 0.5 0 –0.5 30dB/V VREF = 1.67V –1.0 –1.5 –2.0 0.2 0.7 1.2 1.7 VGN (V) Figure 9. Gain Error vs. VGN for Two Gain Scaling Values –1.0 –0.8 –0.6 ...

Page 9

VGN (V) Figure 15. Input Referred Noise vs. VGN 900 VGN = 2.9V 850 800 750 700 650 600 –40 – TEMPERATURE (°C) Figure 16. Input ...

Page 10

AD604 – p-p O VGN = 1V –45 –50 HD2 –55 HD3 –60 –65 –70 100k 1M FREQUENCY (Hz) Figure 21. Harmonic Distortion vs. Frequency – p-p O –35 –40 –45 –50 –55 HD3 ...

Page 11

Figure 27. Large Signal Pulse Response 200 TRIG'D –200 253ns 100ns/DIV Figure 28. Small Signal Pulse Response 500mV 2.9V 100 500mV Figure 29. Power-Up/Power-Down Response p-p O VGN = ...

Page 12

AD604 1M 100k 10k 1k 100 10k 100k 1M FREQUENCY (Hz) Figure 33. Input Impedance vs. Frequency 27.6 27.4 27.2 27.0 26.8 26.6 26.4 26.2 26.0 25.8 –40 – TEMPERATURE (°C) Figure 34. Input Bias ...

Page 13

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 ...

Page 14

AD604 PREAMPLIFIER The input capability of the following single-supply DSX (2.5 ± for supply) limits the maximum input voltage of the preamplifier to ±400 mV for the 14 dB gain configuration or ±200 mV for ...

Page 15

The larger portion of the input referred voltage noise comes from the amplifier with 0.63 nV/√Hz. The current noise is independent of gain and depends only on the bias current in the input stage of the preamplifier, which is 3 ...

Page 16

AD604 AC COUPLING The DSX portion of the AD604 is a single-supply circuit and, therefore, its inputs need to be ac-coupled to accommodate ground-based signals. External Capacitors C1 and C2 in Figure 37 level shift the ground referenced preamplifier output ...

Page 17

The AFA offers the following additional features: • The ability to invert the signal by switching the positive and negative inputs to the ladder network • The possibility of using DSX1 input as a second signal input • Fully differential ...

Page 18

AD604 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 ...

Page 19

C1 0.1µF –DSX1 VGN1 1 +DSX1 VREF 2 C2 AD604 0.1µF PAO1 OUT1 3 FBK1 GND1 4 PAI1 VPOS VIN 5 R1 (MAX 49.9Ω 800mV p-p) COM1 VNEG 6 COM2 VNEG 7 8 PAI2 VPOS FBK2 GND2 9 C3 PAO2 ...

Page 20

AD604 The 50 Ω termination resistor, in parallel with the 50 Ω source resistance of the signal generator, forms an effective resistance of 25 Ω as seen by the input of the preamplifier, creating 4.07 μV of rms noise at ...

Page 21

At 1 MHz, the attenuation is about −0.2 dB, increasing to − MHz and − 100 MHz. Signals less than approximately 1 MHz are not significantly affected. Figure 49 shows the control voltage vs. the ...

Page 22

AD604 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 ...

Page 23

C3 0.1µF VGN1 –DSX1 1 24 +DSX1 VREF 0.1µF PAO1 PAO1 OUT1 3 22 NOTE 2 R2 RGN GND1 FBK1 4 21 AD604 PAI1 VPOS IN1 5 20 COM1 VNEG 6 19 COM2 VNEG 7 18 PAI2 ...

Page 24

AD604 EVALUATION BOARD Figure photograph of the AD604 evaluation board assembly. Multiple input connections, testpoints, switch-selectable options, and on-board trims offer convenience when configuring the AD604 in various operating modes. The evaluation board requires only a dual ...

Page 25

PREAMPLIFIER GAIN The default gain of the preamplifier achieved with 0 Ω resistors in the R11and R12 positions. The 14 dB and 20 dB preset gains are accurate because of the close matching of ...

Page 26

AD604 EVALUATION BOARD ARTWORK AND SCHEMATIC Figure 58. Component Side Copper Figure 59. Secondary Side Copper Figure 60. Internal Ground Plane Figure 61. Internal Power Plane Figure 62. Component Side Silkscreen of the AD604 Evaluation Board Rev Page ...

Page 27

V – 10µF 10µF + 10V 10V +5V –5V VGA1 –DSX1 –IN VG1–IN C8 0.1µF SMA R5 66.5Ω GND VGA1 1 +DSX1 +IN VG1+IN –DSX1 C9 0.1µF SMA 2 R6 +DSX1 66.5Ω PAO1 PAO1 3 PAO1 ...

Page 28

AD604 OUTLINE DIMENSIONS 24 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR ...

Page 29

... AD604ARZ-RL −40°C to +85°C AD604ARS −40°C to +85°C AD604ARS-REEL7 −40°C to +85°C AD604ARSZ −40°C to +85°C AD604ARSZ-RL −40°C to +85°C AD604ARSZ-R7 −40°C to +85°C AD604-EVALZ RoHS Compliant Part. 8.50 8.20 7. 5.60 5 ...

Page 30

AD604 NOTES Rev Page ...

Page 31

NOTES Rev Page AD604 ...

Page 32

AD604 NOTES ©1996–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00540-0-12/10(G) Rev Page ...

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