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Analog Devices AD602 manual

Instruction/ maintenance manual of the product AD602 Analog Devices

File size: 0.71 mb
Number of pages: 20

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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.
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.
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 . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.

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