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| HT9274 Quad Micropower Op Amp Features * * * * * * * Quad micro power op amp Wide range of supply voltage: 1.6V~5.5V High input impedance Single supply operation Low current consumption: < 5mA per amp Rail to rail output Provides both sink and source output drive capability * * * Common mode input extends below negative rail Pin compatible with LM324/WT274 (14-pin DIP) 14-pin DIP/SOP package Applications * * * * Battery powered system Sensor amplifier Low power gain blocks Low power comparators * * * * Signal detectors Active filters Caller ID systems Communication systems General Description The HT9274 is a CMOS quad micro-power operational amplifier featuring high input impedance, extremely low power, high gain and high stability. It allows common mode input voltage range which extends below the negative rail, output swings to both rails with a reasonable sink and souce capability of the output drive current. This cost-effective device is suitable for high gain, low frequency, low power applications, especially ideal for battery powered systems where mA range of standby current is essential for long battery life span. For example, in multi-standard Caller ID systems, HT9274 is ideal as a low power line signal monitor/detector, and in car alarm systems, the HT9274 is excellent for piezo vibratile detector signal amplifier application. Comparison Table ITEM HT9274 WT274 LM324 Operating Operating Voltage Current 1.6~5.5V 1.35~10V 3~32V 5mA 9mA 400mA Output Source Current 500mA 16mA 20mA Output Sink Current 500mA 2mA 8mA Input Bias Current 1pA 1pA 45nA GBW 0.1MHz 0.1MHz 1MHz Max. load (To VDD or VSS) >10kW >500kW >2kW 1 November 23, 1999 HT9274 Block Diagram 1O U T 1 IN 1 IN + VDD 2 IN + 2 IN 2O U T 4O U T 4 IN 4 IN + VSS 3 IN + 3 IN 3O U T Pin Assignment 1O UT 1 2 3 4 5 6 7 8 1 IN 1 IN + VDD 2 IN + 2 IN 2O UT 14 13 12 11 10 9 4O UT 4 IN 4 IN + VSS 3 IN + 3 IN 3O UT HT9274 1 4 D IP /S O P 2 November 23, 1999 HT9274 Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name 1OUT 1IN1IN+ VDD 2IN+ 2IN2OUT 3OUT 3IN3IN+ VSS 4IN+ 4IN4OUT I/O O I I 3/4 I I O O I I 3/4 I I O Internal Connection CMOS OUT PMOS IN PMOS IN 3/4 PMOS IN PMOS IN CMOS OUT CMOS OUT PMOS IN PMOS IN 3/4 PMOS IN PMOS IN CMOS OUT Description Output pin of the op amp 1 Inverting input pin of the op amp 1 Noninverting input pin of the op amp 1 Positive power supply Noninverting input pin of the op amp 2 Inverting input pin of the op amp 2 Output pin of the op amp 2 Output pin of the op amp 3 Inverting input pin of the op amp 3 Noninverting input pin of the op amp 3 Negative power supply Noninverting input pin of the op amp 4 Inverting input pin of the op amp 4 Output pin of the op amp 4 Absolute Maximum Ratings Supply Voltage.................................-0.3V to 6V Input Voltage .................VSS-0.3V to VDD+0.3V Storage Temperature.................-50C to 125C Operating Temperature ..............-20C to 75C Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. 3 November 23, 1999 HT9274 Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name 1OUT 1IN1IN+ VDD 2IN+ 2IN2OUT 3OUT 3IN3IN+ VSS 4IN+ 4IN4OUT I/O O I I 3/4 I I O O I I 3/4 I I O Internal Connection CMOS OUT PMOS IN PMOS IN 3/4 PMOS IN PMOS IN CMOS OUT CMOS OUT PMOS IN PMOS IN 3/4 PMOS IN PMOS IN CMOS OUT Description Output pin of the op amp 1 Inverting input pin of the op amp 1 Noninverting input pin of the op amp 1 Positive power supply Noninverting input pin of the op amp 2 Inverting input pin of the op amp 2 Output pin of the op amp 2 Output pin of the op amp 3 Inverting input pin of the op amp 3 Noninverting input pin of the op amp 3 Negative power supply Noninverting input pin of the op amp 4 Inverting input pin of the op amp 4 Output pin of the op amp 4 4 November 23, 1999 HT9274 Functional Description Input stage The input stage of op amps are nominal PMOS differential amplifiers (see the following diagram), therefore the common mode input voltage can extend to VSS-0.6V. On the other hand the common mode input voltage has to be maintained below (VDD-1)V to keep the input device (M2 and M3) active. This implies that when using HT9274 as a voltage follower, the input as well as output active range will be limited between VSS ~ VDD-1V (approx.). Avoid applying any voltage greater than VDD+0.6V or less than VSS-0.6V to the input pins, otherwise the internal input protection devices may be damaged. V V M1 N o n in v e r tin g In In v e r tin g In M2 PMOS M3 PMOS T o O u tp u t S ta g e DD Output stage The HT9274 uses push-pull CMOS configuration as the output stage of op amps to minimize low power consumption and to provide adequate output driving current. Note that the output is an unbuffered structure, therefore the open loop gain will be affected by the load resistor since the voltage gain of this stage can be expressed as (gm5+ gm6)RL. V DD V B IA S M5 B IA S OUT F ro m D iffe r e n tia l Amp M6 V SS V M4 SS M5 V SS Since the input impedance of PMOS is inherently very high, it can directly couple to high impedance elements without loading effect. For example, coupling to ceramic transducers, integrating capacitor and resistor networks. Actually the extremly high input impedance is its major advantage over the bipolar counterpart, in some application fields such as integrators where the input current of op amp can cause significant error, the HT9274 is a better choice than the popular LM324. Because of the consideration for minimized power consumption, the max. output current is limited to about 400mA for both source and sink drive. This is believed to be enough for most low power systems, however it is recommended to use the load resistor of >10kW for normal applications. In case of heavy load driving, an external buffer stage using bipolar transistors is recommended. The HT9274 is internally compensated for AC stability and capable to withstand up to a 100pF capacitive load. 5 November 23, 1999 HT9274 Application Circuits Micro power sensor amplifier & detector V DD 9 10 3 2 1 6 11 8 5 4 SENSOR 7 13 12 DET_O UT 14 Micro power line signal monitor V 2 3 1 5 6 11 V B IA S DD T IP R IN G 4 7 DET_O UT Micro power line voltage monitor L IN E BATT 3 2 4 1 DET_O UT 11 6 November 23, 1999 |
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