Datasheet TC913A, TC913B (Microchip) - 5

TC913A/TC913B 3.0 DETAILED DESCRIPTION 3.3 Overload Recovery
The TC913 recovers quickly from output saturation.
3.1 Theory of Operation
Typical recovery time from positive output saturation is Each of the TC913’s two Op Amps actually consists of 20 msec. Negative output saturation recovery time is two amplifiers. A main amplifier is always connected typically 5 msec. from the input to the output. A separate nulling amplifier alternately nulls its own offset and then the offset of the
3.4 Avoiding Latch-up
amplifier. Since each amplifier is continuously being Junction-isolated CMOS circuits inherently contain a nulled, offset voltage drift with time, temperature and parasitic p-n-p-n transistor circuit. Voltages exceeding power supply variations is greatly reduced. the supplies by 0.3V should not be applied to the All nulling circuitry is internal and the nulling operation device pins. Larger voltages can turn the p-n-p-n is transparent to the user. Offset nulling voltages are device on, causing excessive device power supply stored on two internal capacitors. An internal oscillator current and power dissipation. The TC913’s power and control logic, shared by the TC913’s two amplifiers, supplies should be established at the same time or control the nulling process. before input signals are applied. If this is not possible, input current should be limited to 0.1 mA to avoid
3.2 Pin Compatibility
triggering the p-n-p-n structure. The TC913 pinout is compatible with OP-14, LM358, MC1458, LT1013, TLC322, and similar dual Op Amps. In many circuits operating from single or ±5V supplies, the TC913 is a drop-in replacement offering DC performance rivaling that of the best single Op Amps. The TC913’s amplifiers include a low-impedance class AB output buffer. Some previous CMOS chopper amplifiers used a high-impedance output stage which made open-loop gain dependent on load resistance. The TC913’s open-loop gain is not dependent on load resistance.  2001-2012 Microchip Technology Inc. DS21482D-page 5 Document Outline TC913A/TC913B Features: Applications: Device Selection Table Package Type General Description: Functional Block Diagram 1.0 Electrical characteristics Absolute Maximum Ratings* tc913a and tc913b electrical specifications Note 1: Characterized; not 100% tested. 2.0 Pin Descriptions TABLE 2-1: Pin Function Table 3.0 Detailed Description 3.1 Theory of Operation 3.2 Pin Compatibility 3.3 Overload Recovery 3.4 Avoiding Latch-up 4.0 Typical Characteristics 5.0 packaging information 5.1 Package Marking Information 5.2 Taping Form 5.3 Package Dimensions 6.0 Revision History Notes: Dual Auto-Zeroed Operational Amplifiers The Microchip Web Site Customer Change Notification Service Customer Support Reader Response Corporate Office Atlanta Boston Chicago Cleveland Fax: 216-447-0643 Dallas Detroit Indianapolis Toronto Fax: 852-2401-3431 Australia - Sydney China - Beijing China - Shanghai India - Bangalore Korea - Daegu Korea - Seoul Singapore Taiwan - Taipei Fax: 43-7242-2244-393 Denmark - Copenhagen France - Paris Germany - Munich Italy - Milan Spain - Madrid UK - Wokingham Worldwide Sales and Service