Datasheet ADA4505-1, ADA4505-2, ADA4505-4 (Analog Devices) - 15
| Manufacturer | Analog Devices |
| Description | 10µA, RRIO, Zero Input Crossover Distortion Single Op Amp |
| Pages / Page | 24 / 15 — Data Sheet. ADA4505-1/ADA4505-2/ADA4505-4. 300. 250. SY = 5V. TA = 25°C. … |
| Revision | E |
| File Format / Size | PDF / 870 Kb |
| Document Language | English |
Data Sheet. ADA4505-1/ADA4505-2/ADA4505-4. 300. 250. SY = 5V. TA = 25°C. 200. PP = POSITIVE PUMPED VOLTAGE = VDD + 1.8V. 150. VDD. 100. VBIAS
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Data Sheet ADA4505-1/ADA4505-2/ADA4505-4
Figure 55 displays a typical front-end section of an operational
300
amplifier with an on-chip charge pump.
V 250 SY = 5V TA = 25°C V 200 PP = POSITIVE PUMPED VOLTAGE = VDD + 1.8V V 150 PP VDD 100 VBIAS 50 ) V 0 CASCODE (µ +IN Q1 Q2 –IN STAGE OS –50 AND V RAIL-TO-RAIL OUT –100 OUTPUT STAGE –150 –200 –250
45 0 6-
V –300
6 41
SS
04 07
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
6- Figure 55. Typical Front-End Section of an Op Amp
V
41
CM (V)
07 with Embedded Charge Pump Figure 56. Input Offset Voltage vs. Input Common-Mode Voltage Response Figure 56 shows the typical response of two devices from Figure 12, (Powered by a 5 V Supply; Results of Two Units Are Displayed) which shows the input offset voltage vs. input common-mode This solution improves the CMRR performance tremendously. voltage for 10 devices. Figure 56 is expanded to make it easier to For example, if the input varies from rail to rail on a 2.5 V compare with Figure 54, which shows the typical input offset supply rail, using a part with a CMRR of 70 dB minimum, voltage vs. common-mode voltage response in a dual differential an input-referred error of 790 μV is introduced. Another part pair input stage op amp. with a CMRR of 52 dB minimum generates a 6.3 mV error. The ADA4505-x family CMRR of 90 dB minimum causes only a 79 μV error. As with the PSRR error, there are complex ways to minimize this error, but the ADA4505-x family solves this problem without incurring unnecessary circuitry complexity or increased cost. Rev. E | Page 15 of 24 Document Outline Features Applications General Description Pin Configurations Revision History Specifications Electrical Characteristics—1.8 V Operation Electrical Characteristics—5 V Operation Absolute Maximum Ratings Thermal Resistance ESD Caution Typical Performance Characteristics Theory of Operation Applications Information Pulse Oximeter Current Source Four-Pole, Low-Pass Butterworth Filter for Glucose Monitor Outline Dimensions Ordering Guide
Data Sheet ADA4505-1/ADA4505-2/ADA4505-4
Figure 55 displays a typical front-end section of an operational
300
amplifier with an on-chip charge pump.
V 250 SY = 5V TA = 25°C V 200 PP = POSITIVE PUMPED VOLTAGE = VDD + 1.8V V 150 PP VDD 100 VBIAS 50 ) V 0 CASCODE (µ +IN Q1 Q2 –IN STAGE OS –50 AND V RAIL-TO-RAIL OUT –100 OUTPUT STAGE –150 –200 –250
45 0 6-
V –300
6 41
SS
04 07
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
6- Figure 55. Typical Front-End Section of an Op Amp
V
41
CM (V)
07 with Embedded Charge Pump Figure 56. Input Offset Voltage vs. Input Common-Mode Voltage Response Figure 56 shows the typical response of two devices from Figure 12, (Powered by a 5 V Supply; Results of Two Units Are Displayed) which shows the input offset voltage vs. input common-mode This solution improves the CMRR performance tremendously. voltage for 10 devices. Figure 56 is expanded to make it easier to For example, if the input varies from rail to rail on a 2.5 V compare with Figure 54, which shows the typical input offset supply rail, using a part with a CMRR of 70 dB minimum, voltage vs. common-mode voltage response in a dual differential an input-referred error of 790 μV is introduced. Another part pair input stage op amp. with a CMRR of 52 dB minimum generates a 6.3 mV error. The ADA4505-x family CMRR of 90 dB minimum causes only a 79 μV error. As with the PSRR error, there are complex ways to minimize this error, but the ADA4505-x family solves this problem without incurring unnecessary circuitry complexity or increased cost. Rev. E | Page 15 of 24 Document Outline Features Applications General Description Pin Configurations Revision History Specifications Electrical Characteristics—1.8 V Operation Electrical Characteristics—5 V Operation Absolute Maximum Ratings Thermal Resistance ESD Caution Typical Performance Characteristics Theory of Operation Applications Information Pulse Oximeter Current Source Four-Pole, Low-Pass Butterworth Filter for Glucose Monitor Outline Dimensions Ordering Guide
