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AD711 bảng dữ liệu(PDF) 9 Page - Analog Devices |
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AD711 bảng dữ liệu(HTML) 9 Page - Analog Devices |
9 / 16 page REV. E AD711 –9– Figure 5a. Settling Characteristics 0 to +10 V Step Upper Trace: Output of AD711 Under Test (5 V/Div) Lower Trace: Amplified Error Voltage (0.01%/Div) Figure 5b. Settling Characteristics 0 to –10 V Step Upper Trace: Output of AD711 Under Test (5 V/Div) Lower Trace: Amplified Error Voltage (0.01%/Div) GUARDING The low input bias current (15 pA) and low noise characteristics of the AD711 BiFET op amp make it suitable for electrometer applications such as photo diode preamplifiers and picoampere 5pF AD3554 VERROR 5 +15V 5k –15V 0.47 F HP2835 TEXTRONIX 7A26 OSCILLOSCOPE PREAMP INPUT SELECTION 1M 20pF 0.1 F AD711 +15V –15V 0.1 F VOUT 10pF HP2835 10k 0.2-0.0pF 1.1k 10k 5-18pF 10k 200k 4.99k 4.99k VIN DATA DYNAMICS 5109 (OR EQUIVALENT FLAT TOP PULSE GENERATOR) 0.47 F 205 Figure 6. Settling Time Test Circuit current-to-voltage converters. The use of a guarding technique such as that shown in Figure 7, in printed circuit board layout and construction is critical to minimize leakage currents. The guard ring is connected to a low impedance potential at the same level as the inputs. High impedance signal lines should not be extended for any unnecessary length on the printed circuit board. 1 8 7 6 5 4 3 2 6 5 7 8 2 3 1 4 Figure 7. Board Layout for Guarding Inputs D/A CONVERTER APPLICATIONS The AD711 is an excellent output amplifier for CMOS DACs. It can be used to perform both 2-quadrant and 4-quadrant operation. The output impedance of a DAC using an inverted R-2R ladder approaches R for codes containing many 1s, 3R for codes containing a single 1, and for codes containing all zero, the output impedance is infinite. For example, the output resistance of the AD7545 will modu- late between 11 k W and 33 kW. Therefore, with the DAC’s internal feedback resistance of 11 k W, the noise gain will vary from 2 to 4/3. This changing noise gain modulates the effect of the input offset voltage of the amplifier, resulting in nonlinear DAC amplifier performance. The AD711K with guaranteed 500 mV offset voltage minimizes this effect to achieve 12-bit performance. |
Số phần tương tự - AD711 |
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Mô tả tương tự - AD711 |
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