AD602AR-REEL7 Analog Devices Inc, AD602AR-REEL7 Datasheet

AD602AR-REEL7

Manufacturer Part Number

AD602AR-REEL7

Description

IC AMP VGA DUAL LN 50MA 16SOIC

Manufacturer

Analog Devices Inc

Series

X-AMP®r

Datasheet

1.AD600JNZ.pdf (28 pages)

Specifications of AD602AR-REEL7

Rohs Status

RoHS non-compliant

Amplifier Type

Variable Gain

Number Of Circuits

Slew Rate

275 V/µs

-3db Bandwidth

35MHz

Current - Input Bias

350nA

Current - Supply

11mA

Current - Output / Channel

50mA

Voltage - Supply, Single/dual (±)

±4.75 V ~ 5.25 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

16-SOIC (0.300", 7.5mm Width)

Output Type

Gain Bandwidth Product

Voltage - Input Offset

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FEATURES

2 channels with independent gain control

2 gain ranges

Accurate absolute gain: ±0.3 dB

Low input noise: 1.4 nV/√Hz

Low distortion: −60 dBc THD at ±1 V output

High bandwidth: dc to 35 MHz (−3 dB)

Stable group delay: ±2 ns

Low power: 125 mW (maximum) per amplifier

Signal gating function for each amplifier

Drives high speed ADCs

MIL-STD-883-compliant and DESC versions available

APPLICATIONS

Ultrasound and sonar time-gain controls

High performance audio and RF AGC systems

Signal measurement

GENERAL DESCRIPTION

The AD600/AD602

amplifiers are optimized for use in ultrasound imaging systems

but are applicable to any application requiring precise gain, low

noise and distortion, and wide bandwidth. Each independent

channel provides a gain of 0 dB to +40 dB in the AD600 and

−10 dB to +30 dB in the AD602. The lower gain of the AD602

results in an improved signal-to-noise ratio (SNR) at the output.

However, both products have the same 1.4 nV/√Hz input noise

spectral density. The decibel gain is directly proportional to the

control voltage, accurately calibrated, and supply and

temperature stable.

To achieve the difficult performance objectives, a proprietary

circuit form, the X-AMP®, was developed. Each channel of the

X-AMP comprises a variable attenuator of 0 dB to −42.14 dB

followed by a high speed fixed gain amplifier. In this way, the

amplifier never has to cope with large inputs and can benefit

from the use of negative feedback to precisely define the gain

and dynamics. The attenuator is realized as a 7-stage R-2R

ladder network having an input resistance of 100 Ω, laser

trimmed to ±2%. The attenuation between tap points is 6.02 dB;

the gain-control circuit provides continuous interpolation between

these taps. The resulting control function is linear in dB.

Rev. E

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.

Linear in dB gain response

AD600: 0 dB to 40 dB

AD602: –10 dB to +30 dB

dual channel, low noise, variable gain

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

The gain-control interfaces are fully differential, providing an

input resistance of ~15 MΩ and a scale factor of 32 dB/V (that

is, 31.25 mV/dB) defined by an internal voltage reference. The

response time of this interface is less than 1 μs. Each channel

also has an independent gating facility that optionally blocks

signal transmission and sets the dc output level to within a few

millivolts of the output ground. The gating control input is

TTL- and CMOS-compatible.

The maximum gain of the AD600 is 41.07 dB, and the

maximum gain of the AD602 is 31.07 dB; the −3 dB bandwidth

of both models is nominally 35 MHz, essentially independent of

the gain. The SNR for a 1 V rms output and a 1 MHz noise

bandwidth is typically 76 dB for the AD600 and 86 dB for the

AD602. The amplitude response is flat within ±0.5 dB from

100 kHz to 10 MHz; over this frequency range, the group delay

varies by less than ±2 ns at all gain settings.

Each amplifier channel can drive 100 Ω load impedances with

low distortion. For example, the peak specified output is ±2.5 V

minimum into a 500 Ω load or ±1 V into a 100 Ω load. For a

200 Ω load in shunt with 5 pF, the total harmonic distortion for

a ±1 V sinusoidal output at 10 MHz is typically −60 dBc.

The AD600J/AD602J are specified for operation from 0°C to 70°C

and are available in 16-lead PDIP (N) and 16-lead SOIC_W

packages. The AD600A/AD602A are specified for operation from

−40°C to +85°C and are available in 16-lead CERDIP (Q) and

16-lead SOIC_W packages. The AD600S/ AD602S are specified

for operation from −55°C to +125°C, are available in a 16-lead

CERDIP (Q) package, and are MIL-STD-883-compliant. The

AD600S/AD602S are also available under DESC SMD 5962-94572.

Patented.

C1LO

A1LO

C1HI

A1HI

Dual, Low Noise, Wideband

500Ω

GAIN CONTROL

0dB

REFERENCE

INTERFACE

SCALING

–6.02dB

FUNCTIONAL BLOCK DIAGRAM

Variable Gain Amplifiers

R-2R LADDER NETWORK

–12.04dB

–18.06dB

PRECISION PASSIVE

INPUT ATTENUATOR

–22.08dB

–30.1dB

Figure 1.

–36.12dB

AD600/AD602

–42.14dB

62.5Ω

INTERFACE

2.24kΩ (AD600)

41.07dB (AD600)

31.07dB (AD602)

RF1

20Ω

694Ω (AD602)

GATING

FIXED-GAIN

AMPLIFIER

GAT1

www.analog.com

RF2

A1OP

A1CM

Related parts for AD602AR-REEL7

AD602AR-REEL7 Summary of contents

Page 1

FEATURES 2 channels with independent gain control Linear in dB gain response 2 gain ranges AD600 AD602: – +30 dB Accurate absolute gain: ±0.3 dB Low input noise: 1.4 nV/√Hz Low distortion: −60 ...

AD600/AD602 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ...

Page 3

SPECIFICATIONS Each amplifier section 25° Specifications for the AD600/AD602 are identical, unless otherwise noted. Table 1. Parameter INPUT CHARACTERISTICS Input Resistance Input Capacitance 2 Input Noise Spectral Density Noise Figure Common-Mode Rejection Ratio OUTPUT ...

Page 4

AD600/AD602 Parameter SIGNAL GATING INTERFACE Logic Input LO (Output On) Logic Input HI (Output Off ) Response Time Input Resistance Output Gated Off Output Offset Voltage Output Noise Spectral Density Signal Feedthrough @ 1 MHz AD600 AD602 POWER SUPPLY Specified ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage ±V S Input Voltages Pin 1, Pin 8, Pin 9, Pin 16 Pin 2, Pin 3, Pin 6, Pin 7 Pin 4, Pin 5 Internal Power Dissipation Operating Temperature Range J Grade ...

Page 6

AD600/AD602 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 C1LO CH1 Gain-Control Input LO (Positive Voltage Reduces CH1 Gain) 2 A1HI CH1 Signal Input HI (Positive Voltage Increases CH1 Output) 3 A1LO CH1 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 0.45 0.35 0.25 0.15 0.05 –0.05 –0.15 –0.25 –0.35 –0.45 –0.7 –0.5 –0.3 –0.1 0.1 GAIN CONTROL VOLTAGE (V) Figure 3. Gain Error vs. Gain Control Voltage 20dB 17dB 0° –45° –90° 100k 1M FREQUENCY (Hz) Figure ...

Page 8

AD600/AD602 102 101 GAIN = 40dB 100 99 GAIN = 20dB 98 97 GAIN = 0dB 100k 1M FREQUENCY (Hz) Figure 9. Input Impedance vs. Frequency AD600 3 2 AD602 1 0 ...

Page 9

Figure 15. Input Stage Overload Recovery Time 1V 100 200mV 500ns Figure 16. Output Stage Overload Recovery Time 500mV 100 500ns Figure 17. Transient Response Minimum ...

Page 10

AD600/AD602 THEORY OF OPERATION The AD600/AD602 have the same general design and features. They comprise two fixed gain amplifiers, each preceded by a voltage-controlled attenuator 42.14 dB with independent control interfaces, each having a scaling factor ...

Page 11

It is apparent from the foregoing that it is essential to use a low resistance in the design of the ladder network to achieve low noise. In some applications, this can be inconvenient, requiring the use of an external buffer ...

Page 12

AD600/AD602 ACHIEVING 80 dB GAIN RANGE The two amplifier sections of the X-AMP can be connected in series to achieve higher gain. In this mode, the output of A1 (A1OP and A1CM) drives the input of A2 via a high-pass ...

Page 13

The gains are offset such that A2’s gain is increased only after A1’s gain has reached its maximum value (see Figure 26). Note that for a differential input of −700 mV or less, the gain of a single amplifier (A1 ...

Page 14

AD600/AD602 COMBINED –10 –0.5 0 0.5 1.0 1 Figure 27. Plot of Separate and Overall Gains in Sequential Control –1 –2 ...

Page 15

APPLICATIONS The full potential of any high performance amplifier can only be realized by careful attention to details in its applications. The following pages describe fully tested circuits in which many such details have already been considered. However ...

Page 16

AD600/AD602 REALIZING OTHER GAIN RANGES Larger gain ranges can be accommodated by cascading amplifiers. Combinations built by cascading two amplifiers include − +60 dB (using one AD602), − +70 dB (using ½ AD602 followed ...

Page 17

This is a Class AB amplifier increases in a positive IN direction, Q1 conducts more heavily and its r while Q2 increases. Conversely, increasingly negative values of V result in the decreasing, while the r ...

Page 18

AD600/AD602 A simple half-wave detector is used based on Q1 and R2. The average current into Capacitor C2 is the difference between the current provided by the AD590 (300 μA at 300 K, 27°C) and the collector current of Q1. ...

Page 19

INPUT AMPLITUDE (V rms) Figure 39. Output Stabilization vs. rms Input for Sine Wave Inputs at 100 kHz, 1 MHz, and 10 MHz While the band gap principle used here sets the output amplitude ...

Page 20

AD600/AD602 CAL 0dB C1LO 1 R1 INPUT 115Ω A1HI 1V rms 2 MAX R2 200Ω A1LO (SINE WAVE) 3 GAT1 4 GAT2 R3 5 133kΩ A2LO 6 A2HI U3A 7 C2LO 1/2 8 AD712 15.625mV/dB 3.01kΩ Figure ...

Page 21

This system can, of course, be used as an AGC amplifier in which the rms value of the input is leveled. Figure 43 shows the decibel output voltage. More revealing is Figure 44, which shows that the deviation from the ...

Page 22

AD600/AD602 C1LO 1 INPUT A1HI 1V rms 2 + MAX A1 A1LO (SINE WAVE) 3 – GAT1 4 REF GAT2 5 A2LO 6 – A2 A2HI 7 + C2LO 8 U1 AD600 +5V FB 0.1µF +5V DEC 0.1µF –5V DEC ...

Page 23

INPUT SIGNAL (V rms) Figure 49. Gain Error for Figure 41 Without the 2 dB Offset Modification 2.0 1.5 1.0 0.5 0.1 0 –0.1 ...

Page 24

AD600/AD602 Figure 51 shows the circuit for the sequential control scheme with R16 provide offsets of 42.14 dB between the individual amplifiers to ensure smooth transitions between the gain of each successive X-AMP, with the sequence of ...

Page 25

INPUT SIGNAL (V rms) Figure 52 Linear over the Full 120 dB Range LOG Figure 52 shows linear over ...

Page 26

AD600/AD602 For the next control range, the gain of U1A remains fixed at its maximum value of 41.07 dB and only the gain of U1B is varied, while that of U2A remains at its minimum value of ...

Page 27

OUTLINE DIMENSIONS PIN 1 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) 0.005 (0.13) MIN 0.098 (2.49) MAX 16 9 0.310 (7.87) 0.220 (5.59 PIN 1 0.100 (2.54) BSC 0.840 (21.34) ...

Page 28

... AD600JR AD600JR-REEL AD600JR-REEL7 AD600JRZ AD600JRZ- AD600JRZ- AD600SQ/883B AD602AQ − +30 dB AD602AR − +30 dB AD602AR-REEL − +30 dB AD602AR-REEL7 − + AD602ARZ − + AD602ARZ-R7 − +30 dB AD602ARZ-RL 1 − +30 dB AD602JCHIPS AD602JN − + AD602JNZ − +30 dB AD602JR − +30 dB AD602JR-REEL – +30 dB AD602JR-REEL7 − + AD602JRZ − ...

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