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AD707KN Scheda tecnica(PDF) 8 Page - Analog Devices |
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AD707KN Scheda tecnica(HTML) 8 Page - Analog Devices |
8 / 8 page AD707 REV. B –8– OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Metal Can (H-08A) 45 ° BSC 0.100 (2.54) BSC 0.034 (0.86) 0.027 (0.69) 0.045 (1.14) 0.027 (0.69) 0.160 (4.06) 0.110 (2.79) 0.100 (2.54) BSC 0.200 (5.08) BSC 6 8 5 7 1 4 2 3 REFERENCE PLANE BASE & SEATING PLANE 0.335 (8.51) 0.305 (7.75) 0.370 (9.40) 0.335 (8.51) 0.750 (19.05) 0.500 (12.70) 0.045 (1.14) 0.010 (0.25) 0.050 (1.27) MAX 0.040 (1.02) MAX 0.019 (0.48) 0.016 (0.41) 0.021 (0.53) 0.016 (0.41) 0.185 (4.70) 0.165 (4.19) 0.250 (6.35) MIN 8-Pin Cerdip (Q-8) 0.320 (8.13) 0.290 (7.37) 0.015 (0.38) 0.008 (0.20) 15 ° 0 ° 0.005 (0.13) MIN 0.055 (1.4) MAX 1 PIN 1 4 5 8 0.310 (7.87) 0.220 (5.59) 0.405 (10.29) MAX 0.200 (5.08) MAX SEATING PLANE 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN 0.200 (5.08) 0.125 (3.18) 0.100 (2.54) BSC 8-Pin Plastic DIP (N-8) 8 14 5 0.430 (10.92) 0.348 (8.84) 0.280 (7.11) 0.240 (6.10) PIN 1 SEATING PLANE 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) MIN 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) BSC 0.160 (4.06) 0.115 (2.93) 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 8-Lead SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 4 1 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) BSC 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 ° 0 ° 0.0196 (0.50) 0.0099 (0.25) x 45 ° PRECISION CURRENT TRANSMITTER The AD707’s excellent dc performance, especially the low offset voltage, low offset voltage drift and high CMRR, makes it possible to make a high precision voltage-controlled current transmitter using a variation of the Howland Current Source circuit (Figure 26). This circuit provides a bidirectional load current which is derived from a differential input voltage. 6 2 3 +VS AD707 0.1µF –VS 4 0.1µF 7 R4 100k Ω R3 100k Ω R2 100k Ω R1 100k Ω RL IL RSCALE VIN VIN RSCALE tL = ––––––– ––– ( ) R2 R1 Figure 26. Precision Current Source/Sink The performance and accuracy of this circuit will depend almost entirely on the tolerance and selection of the resistors. The scale resistor (RSCALE) and the four feedback resistors directly affect the accuracy of the load current and should be chosen carefully or trimmed. As an example of the accuracy achievable, assume IL must be 10 mA, and the available VIN is only 10 mV. RSCALE = 10 mV/10 mA = 1 Ω IERROR due to the AD707C: Maximum IERROR = 2(VOS)/RSCALE + 2(VOS Drift)/RSCALE + IOS (100 k/RSCALE) = 2 (15 µV)/l Ω +2 (0.1 µV/°C)/l Ω + 1 nA (100 k)/l Ω (1.5 nA @ 125°C) = 30 µA + 0.2 µA/°C + 100 µA (150 µA @ 125°C) = 130 µA/10 mA = 1.3% @ 25°C = 180 µA/10 mA = 1.8% @ 125°C Low drift, high accuracy resistors are required to achieve high precision. |
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