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ICL7611DCBA-T Datasheet(PDF) 5 Page - Intersil Corporation |
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ICL7611DCBA-T Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 10 page 5 Application Information Static Protection All devices are static protected by the use of input diodes. However, strong static fields should be avoided, as it is possible for the strong fields to cause degraded diode junction characteristics, which may result in increased input leakage currents. Latchup Avoidance Junction-isolated CMOS circuits employ configurations which produce a parasitic 4-layer (PNPN) structure. The 4-layer structure has characteristics similar to an SCR, and under certain circumstances may be triggered into a low impedance state resulting in excessive supply current. To avoid this condition, no voltage greater than 0.3V beyond the supply rails may be applied to any pin. In general, the op amp supplies must be established simultaneously with, or before any input signals are applied. If this is not possible, the drive circuits must limit input current flow to 2mA to prevent latchup. Choosing the Proper IQ The ICL7611 and ICL7612 have a similar IQ set-up scheme, which allows the amplifier to be set to nominal quiescent currents of 10 µA, 100µA or 1mA. These current settings change only very slightly over the entire supply voltage range. The ICL7611/12 have an external IQ control terminal, permitting user selection of quiescent current. To set the IQ connect the IQ terminal as follows: IQ = 10µA - IQ pin to V+ IQ = 100µA - IQ pin to ground. If this is not possible, any voltage from V+ - 0.8 to V- +0.8 can be used. IQ = 1mA - IQ pin to V- NOTE: The output current available is a function of the quiescent current setting. For maximum peak-to-peak output voltage swings into low impedance loads, IQ of 1mA should be selected. Output Stage and Load Driving Considerations Each amplifiers’ quiescent current flows primarily in the output stage. This is approximately 70% of the IQ settings. This allows output swings to almost the supply rails for output loads of 1M Ω, 100kΩ, and 10kΩ, using the output stage in a highly linear class A mode. In this mode, crossover distortion is avoided and the voltage gain is maximized. However, the output stage can also be operated in Class AB for higher output currents. (See graphs under Typical Operating Characteristics). During the transition from Class A to Class B operation, the output transfer characteristic is non-linear and the voltage gain decreases. Input Offset Nulling Offset nulling may be achieved by connecting a 25K pot between the BAL terminals with the wiper connected to V+. At quiescent currents of 1mA and 100 µA the nulling range provided is adequate for all VOS selections; however with IQ =10µA, nulling may not be possible with higher values of VOS. Frequency Compensation The ICL7611 and ICL7612 are internally compensated, and are stable for closed loop gains as low as unity with capacitive loads up to 100pF. Extended Common Mode Input Range The ICL7612 incorporates additional processing which allows the input CMVR to exceed each power supply rail by 0.1V for applications where VSUPP ≥±1.5V. For those applications where VSUPP ≤±1.5V the input CMVR is limited in the positive direction, but may exceed the negative supply rail by 0.1V in the negative direction (e.g., for VSUPPLY = ±1V, the input CMVR would be +0.6V to -1.1V). Operation At VSUPPLY = ±1V Operation at VSUPPLY = ±1V is guaranteed at IQ = 10µA for A and B grades only. Output swings to within a few millivolts of the supply rails are achievable for RL ≥ 1MΩ. Guaranteed input CMVR is ±0.6V minimum and typically +0.9V to -0.7V at VSUPPLY = ±1V. For applications where greater common mode range is desirable, refer to the description of ICL7612 above. Typical Applications The user is cautioned that, due to extremely high input impedances, care must be exercised in layout, construction, board cleanliness, and supply filtering to avoid hum and noise pickup. Note that in no case is IQ shown. The value of IQ must be chosen by the designer with regard to frequency response and power dissipation. ICL7612 + - VIN VOUT RL ≥10K FIGURE 1. SIMPLE FOLLOWER (NOTE 4) ICL7612 + - VIN VOUT 100K +5 +5 1M TO CMOS OR LPTTL LOGIC NOTE: 4. By using the ICL7612 in this application, the circuit will follow rail to rail inputs. FIGURE 2. LEVEL DETECTOR (NOTE 4) ICL7611, ICL7612 |
Similar Part No. - ICL7611DCBA-T |
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Similar Description - ICL7611DCBA-T |
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