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Analog Devices AD600 manual

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Table of contents for the manual

  • Page 1

    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 Analo[...]

  • Page 2

    AD600J/AD602J AD600A/AD602A Parameter Conditions Min Typ Max Min Typ Max Units INPUT CHARACTERISTICS Input Resistance Pins 2 to 3; Pins 6 to 7 98 100 102 95 100 105 Ω Input Capacitance 22 p F Input Noise Spectral Density 1 1.4 1.4 nV/ √ Hz Noise Figure R S = 50 Ω , Maximum Gain 5.3 5.3 dB R S = 200 Ω , Maximum Gain 2 2 dB Common-Mode Reject[...]

  • Page 3

    AD600/AD602 REV. A –3– ABSOLUTE MAXIMUM RATINGS 1 Supply Voltage ± V S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 7.5 V Input Voltages Pins 1, 8, 9, 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± V S Pins 2, 3, 6, 7 . . . . . . . . . . . . . . . . . . . . . . . ± 2 V Continuous [...]

  • Page 4

    AD600/AD602 REV. A –4– THEORY OF OPERATION The AD600 and AD602 have the same general design and fea- tures. They comprise two fixed gain amplifiers, each preceded by a voltage-controlled attenuator of 0 dB to 42.14 dB with in- dependent control interfaces, each having a scaling factor of 32 dB per volt. The gain of each amplifier in the AD600 i[...]

  • Page 5

    AD600/AD602 REV. A –5– The Gain-Control Interface The attenuation is controlled through a differential, high imped- ance (15 M Ω ) input, with a scaling factor which is laser trimmed to 32 dB per volt, that is, 31.25 mV/dB. Each of the two amplifiers has its own control interface. An internal band- gap reference ensures stability of the scali[...]

  • Page 6

    AD600/AD602 REV. A –6– 41.07dB –40.00dB C1HI C1LO V = 0.592V O1 1.07dB 41.07dB –42.14dB C1HI C1LO V = 1.908V O2 V G1 V G2 OUTPUT 0dB –41.07dB –40.00dB INPUT 0dB V = 0V C 41.07dB –0.51dB C1HI C1LO V = 0.592V O1 40.56dB 41.07dB –41.63dB C1HI C1LO V = 1.908V O2 V G1 V G2 OUTPUT 40dB –1.07dB –0.51dB INPUT 0dB V = 1.25V C 41.07dB 0dB[...]

  • Page 7

    AD600/AD602 REV. A –7– 90 –10 3.0 20 0 0.0 10 –0.5 50 30 40 60 70 80 2.5 2.0 1.5 1.0 0.5 V C OVERALL GAIN – dB A1 COMBINED A2 Figure 5. Plot of Separate and Overall Gains in Sequential Control 5 –8 3.0 –5 –7 0.0 –6 –0.5 –2 –4 –3 –1 1 2 4 3 0 2.0 2.5 1.5 1.0 0.5 V C GAIN ERROR – dB Figure 6. Gain Error for Cascaded Stag[...]

  • Page 8

    AD600/AD602 REV. A –8– 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, as is always true of high accuracy, high speed analog circuits, th[...]

  • Page 9

    AD600/AD602 REV. A –9– 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 REF A1 A2 C1HI A1CM A1OP VPOS VNEG A2OP A2CM C2HI C1LO A1HI A1LO GAT1 GAT2 A2LO A2HI C2LO V IN +5V 100 Ω –5V AD600 or AD602 100 Ω 50 Ω V OUT GAIN-CONTROL VOLTAGE V G Figure 13. An Ultralow Noise VCA Using the AD600 or AD602 A Low Noise, 6 dB Preamplifier In some ultrasound ap[...]

  • Page 10

    AD600/AD602 REV. A –10– 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 REF A1 A2 C1HI A1CM A1OP VPOS VNEG A2OP A2CM C2HI C1LO A1HI A1LO GAT1 GAT2 A2LO A2HI C2LO V ' G C1 100pF C4 0.1 µ F R3 46.4k Ω R4 3.74k Ω R1 100 Ω AD600 +5V DEC –5V DEC RF INPUT AD590 R2 806 Ω 1% C3 15pF 300 µ A (at 300K) Q1 2N3904 V PTAT RF OUTPUT 0.1 µ F 0.1 µ F[...]

  • Page 11

    AD600/AD602 REV. A –11– The emitter circuit of Q1 is somewhat inductive (due its finite f t and base resistance). Consequently, the effective value of R2 in- creases with frequency. This would result in an increase in the stabilized output amplitude at high frequencies, but for the ad- dition of C3, determined experimentally to be 15 pF for the[...]

  • Page 12

    AD600/AD602 REV. A –12– INPUT 1V RMS MAX (SINE WAVE) 0.1 µ F 0.1 µ F FB –6V +6V POWER SUPPLY DECOUPLING NETWORK +6V DEC –6V DEC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 REF A1 A2 C1HI A1CM A1OP VPOS VNEG A2OP A2CM C2HI C1LO A1HI A1LO GAT1 GAT2 A2LO A2HI C2LO R3 133k Ω R2 200 Ω U1 AD600 +6V DEC –6V DEC C2 2 µ F C1 0.1 µ F U3A 1/2 AD7[...]

  • Page 13

    AD600/AD602 REV. A –13– (This system can, of course, be used as an AGC amplifier, in which the rms value of the input is leveled.) Figure 21 shows the “decibel” output voltage. More revealing is Figure 22, which shows that the deviation from the ideal output predicted by Equation 1 over the input range 80 µ V to 500 mV rms is within 450 30[...]

  • Page 14

    AD600/AD602 REV. A –14– 100 dB to 120 dB RMS Responding Constant Bandwidth AGC Systems with High Accuracy dB Outputs The next two applications double as both AGC amplifiers and measurement systems. In both, precise gain offsets are used to achieve either (1) a very high gain linearity of ± 0.1 dB over the full 100 dB range, or (2) the optimal [...]

  • Page 15

    AD600/AD602 REV. A –15– 2.0 –2.0 1 µ V1 0 µ V 10V 1V 100mV 10mV 1mV 100 µ V 0.5 1.0 1.5 –1.5 –1.0 –0.5 GAIN ERROR – dB INPUT SIGNAL – V RMS –0.1 0.1 0 Figure 27. Gain Error for Figure 25 Without the 2 dB Offset Modification 2.0 0 –2.0 1 µ V1 0 µ V 10V 1V 100mV 10mV 1mV 100 µ V 0.5 1.0 1.5 –1.5 –1.0 –0.5 INPUT SIGNAL [...]

  • Page 16

    AD600/AD602 REV. A –16– 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 REF A1 A2 C1HI A1CM A1OP VPOS VNEG A2OP A2CM C2HI C1LO A1HI A1LO GAT1 GAT2 A2LO A2HI C2LO U1 AD600 +6V DEC –6V DEC U3A 1/4 AD713 R2 100 Ω V OUT C1 0.1 µ F U3B 1/4 AD713 R1 133k Ω C2 0.1 µ F R5 5.36k Ω R4 133k Ω C3 0.001 µ F 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 REF A1 [...]

  • Page 17

    AD600/AD602 REV. A –17– 2.0 0 –2.0 1 µ V1 0 µ V 10V 1V 100mV 10mV 1mV 100 µ V 0.5 1.0 1.5 –1.5 –1.0 –0.5 INPUT SIGNAL – V RMS GAIN ERROR – dB 0.2 –0.2 Figure 31. The Error Ripple Due to the Individual Gain Functions 400 300 200 1 µ V1 0 µ V 10V 1V 100mV 10mV 1mV 100 µ V 350 250 INPUT SIGNAL – V RMS GAIN ERROR – mV Figure[...]

  • Page 18

    AD600/AD602–T ypical Performance Characteristics 0.45 –0.45 0.7 –0.25 –0.35 –0.5 –0.7 –0.05 –0.15 0.05 0.15 0.25 0.35 0.5 0.3 0.1 –0.1 –0.3 GAIN CONTROL VOLTAGE – Volts GAIN ERROR – dB Figure 35. Gain Error vs. Gain Control Voltage 10.0 9.0 8.0 –0.7 –0.5 0.7 0.5 0.3 0.1 –0.1 –0.3 9.8 9.6 9.4 9.2 8.2 8.8 8.6 8.4 GROUP[...]

  • Page 19

    AD600/AD602  10  90  100  0%  50mV  5V  100nS OUTPUT INPUT Figure 44. Gating Feedthrough to Output, Gating Off to On  10  90  100  0%  500mV  1V  200nS OUTPUT INPUT Figure 47. Input Stage Overload Recovery Time +10 1k –15 –40 10k 100k 1M 10 M 100M –10 –5 0 +5 –35 –30 –25 –20 CMRR – dB AD60[...]

  • Page 20

    AD600/AD602 REV. A –20– OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Pin Plastic DIP (N-16) Package 0.125 (3.18) MIN 0.035 (0.89) 0.18 (4.57) 0.3 (7.62) 0.87 (22.1) MAX 0.25 (6.35) 0.31 (7.87) 0.18(4.57) MAX 0.011 (0.28) 18 9 16 0.018 (0.46) 0.033 (0.84) 0.1 (2.54) 16-Pin SOIC (R-16) Package 0.019 (0.49) 0.05 (1.27) REF 0.104 (2.6[...]