Analog-devices AD602 Instrukcja Użytkownika Pobierz pdf

REV. A

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

Dual, Low Noise, Wideband

Variable Gain Amplifiers

AD600/AD602*

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

Tel: 617/329-4700 Fax: 617/326-8703

FEATURES

Two Channels with Independent Gain Control

“Linear in dB” Gain Response

Two Gain Ranges:

AD600: 0 dB to +40 dB

AD602: –10 dB to +30 dB

Accurate Absolute Gain: 60.3 dB

Low Input Noise: 1.4 nV/√

Low Distortion: –60 dBc THD at 61 V Output

High Bandwidth: DC to 35 MHz (–3 dB)

Stable Group Delay: 62 ns

Low Power: 125 mW (max) per Amplifier

Signal Gating Function for Each Amplifier

Drives High Speed A/D Converters

MIL-STD-883 Compliant and DESC Versions Available

APPLICATIONS

Ultrasound and Sonar Time-Gain Control

High Performance Audio and RF AGC Systems

Signal Measurement

PRODUCT DESCRIPTION

The AD600 and AD602 dual channel, low noise variable gain

amplifiers are optimized for use in ultrasound imaging systems,

but are applicable to any application requiring very precise gain,

low noise and distortion, and wide bandwidth. Each indepen-

dent 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 at the out-

put. However, both products have the same 1.4 nV/√

Hz input

noise spectral density. The decibel gain is directly proportional

to the control voltage, is accurately calibrated, and is supply-

and temperature-stable.

To achieve the difficult performance objectives, a proprietary

circuit form—the X-AMP®—has been 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 seven-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 be-

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

X-AMP is a registered trademark of Analog Devices, Inc.

*Patented.

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 sig-

nal transmission and sets the dc output level to within a few mil-

livolts of the output ground. The gating control input is TTL

and CMOS compatible.

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

AD602 is 31.07 dB; the –3 dB bandwidth of both models is

nominally 35 MHz, essentially independent of the gain. The

signal-to-noise ratio (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 and AD602J are specified for operation from 0°C

to +70°C, and are available in both 16-pin plastic DIP (N) and

16-pin SOIC (R). The AD600A and AD602A are specified for

operation from –40°C to +85°C and are available in both 16-pin

cerdip (Q) and 16-pin SOIC (R).

The AD600S and AD602S are specified for operation from

–55°C to +125°C and are available in a 16-pin cerdip (Q) pack-

age and are MIL-STD-883 compliant. The AD600S and

AD602S are also available under DESC SMD 5962-94572.

FUNCTIONAL BLOCK DIAGRAM

GAIN CONTROL

INTERFACE

RF1

20Ω

PRECISION PASSIVE

INPUT ATTENUATOR

FIXED GAIN

AMPLIFIER

RF2

2.24kΩ (AD600)

694Ω (AD602)

A1OP

A1CM

C1HI

C1LO

SCALING

REFERENCE

GATING

INTERFACE

GAT1

41.07dB (AD600)

31.07dB (AD602)

500Ω 62.5Ω

0dB –6.02dB –12.04dB –18.06dB –22.08dB –30.1dB –36.12dB –42.14dB

R – 2R LADDER NETWORK

A1HI

A1LO

1 2 3 4 5 6 ... 19 20

Podsumowanie treści

Strona 1 - AD600/AD602*

REV. AInformation furnished by Analog Devices is believed to be accurate andreliable. However, no responsibility is assumed by Analog Devices for itsu

Strona 2 - AD600/AD602–SPECIFICATIONS

AD600/AD602REV. A–10–12345678161514131211109REFA1A2C1HIA1CMA1OPVPOSVNEGA2OPA2CMC2HIC1LOA1HIA1LOGAT1GAT2A2LOA2HIC2LOV 'GC1100pFC40.1µFR346.4kΩR43

Strona 3

AD600/AD602REV. A–11–The emitter circuit of Q1 is somewhat inductive (due its finite ftand base resistance). Consequently, the effective value of R2 i

Strona 4

AD600/AD602REV. A–12–INPUT1V RMSMAX(SINE WAVE)0.1µF0.1µFFB–6V+6VPOWER SUPPLYDECOUPLING NETWORK+6V DEC–6V DEC12345678161514131211109REFA1A2C1HIA1CMA1OP

Strona 5

AD600/AD602REV. A–13–(This system can, of course, be used as an AGC amplifier, inwhich the rms value of the input is leveled.) Figure 21 shows the“dec

Strona 6

AD600/AD602REV. A–14–100 dB to 120 dB RMS Responding Constant Bandwidth AGCSystems with High Accuracy dB OutputsThe next two applications double as bo

Strona 7

AD600/AD602REV. A–15–2.0–2.01µV10µV 10V1V100mV10mV1mV100µV0.51.01.5–1.5–1.0–0.5GAIN ERROR – dBINPUT SIGNAL – V RMS–0.10.10Figure 27. Gain Error for Fi

Strona 8

AD600/AD602REV. A–16–12345678161514131211109REFA1A2C1HIA1CMA1OPVPOSVNEGA2OPA2CMC2HIC1LOA1HIA1LOGAT1GAT2A2LOA2HIC2LOU1 AD600+6V DEC–6V DECU3A1/4AD713R2

Strona 9

AD600/AD602REV. A–17–2.00–2.01µV10µV 10V1V100mV10mV1mV100µV0.51.01.5–1.5–1.0–0.5INPUT SIGNAL – V RMSGAIN ERROR – dB0.2–0.2Figure 31. The Error Ripple

Strona 10 - AD600/AD602

AD600/AD602–Typical Performance Characteristics0.45–0.450.7–0.25–0.35–0.5–0.7–0.05–0.150.050.150.250.350.50.30.1–0.1–0.3GAIN CONTROL VOLTAGE – VoltsGA

Strona 11

AD600/AD60210901000%50mV5V100nSOUTPUTINPUTFigure 44. Gating Feedthrough toOutput, Gating Off to On10901000%500mV1V200nSOUTPUTINPUTFigure

Strona 12

AD600J/AD602J AD600A/AD602AParameter Conditions Min Typ Max Min Typ Max UnitsINPUT CHARACTERISTICSInput Resistance Pins 2 to 3; Pins 6 to 7 98 100 102

Strona 13

AD600/AD602REV. A–20–OUTLINE DIMENSIONSDimensions shown in inches and (mm).16-Pin Plastic DIP (N-16) Package0.125(3.18)MIN0.035(0.89)0.18(4.57)0.3 (7.

Strona 14

AD600/AD602REV. A–3–ABSOLUTE MAXIMUM RATINGS1Supply Voltage ±VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±7.5

Strona 15

AD600/AD602REV. A–4–THEORY OF OPERATIONThe AD600 and AD602 have the same general design and fea-tures. They comprise two fixed gain amplifiers, each p

Strona 16

AD600/AD602REV. A–5–The Gain-Control InterfaceThe attenuation is controlled through a differential, high imped-ance (15 MΩ) input, with a scaling fact

Strona 17

AD600/AD602REV. A–6–41.07dB–40.00dBC1HI C1LOV = 0.592VO11.07dB41.07dB–42.14dBC1HI C1LOV = 1.908VO2VG1VG2OUTPUT0dB–41.07dB–40.00dBINPUT0dBV =

Strona 18 - REV. A–18–

AD600/AD602REV. A–7–90–103.02000.010–0.55030406070802.52.01.51.00.5VCOVERALL GAIN – dBA1COMBINEDA2Figure 5. Plot of Separate and Overall Gains in Sequ

Strona 19

AD600/AD602REV. A–8–APPLICATIONSThe full potential of any high performance amplifier can only berealized by careful attention to details in its applic

Strona 20

AD600/AD602REV. A–9–12345678161514131211109REFA1A2C1HIA1CMA1OPVPOSVNEGA2OPA2CMC2HIC1LOA1HIA1LOGAT1GAT2A2LOA2HIC2LOVIN+5V100Ω–5VAD600 or AD602100Ω50ΩVO

Powiązane modele: AD600

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Analog-devices AD602 Instrukcja Użytkownika

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Podsumowanie treści

Powiązane modele: AD600

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