Datenblatt-Suchmaschine für elektronische Bauteile |
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CA3160E Datenblatt(PDF) 4 Page - Intersil Corporation |
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CA3160E Datenblatt(HTML) 4 Page - Intersil Corporation |
4 / 17 page 4 Schematic Diagram Application Information Circuit Description Refer to the Block Diagram of the CA3160 series CMOS Operational Amplifiers. The input terminals may be operated down to 0.5V below the negative supply rail, and the output can be swung very close to either supply rail in many applications. Consequently, the CA3160 series circuits are ideal for single supply operation. Three class A amplifier stages, having the individual gain capability and current consumption shown in the Block Diagram provide the total gain of the CA3160. A biasing circuit provides two potentials for common use in the first and second stages. Terminals 8 and 1 can be used to supplement the internal phase compensation network if additional phase compensation or frequency roll-off is desired. Terminals 8 and 4 can also be used to strobe the output stage into a low quiescent current state. When Terminal 8 is tied to the negative supply rail (Terminal 4) by mechanical or electrical means, the output potential at Terminal 6 essentially rises to the positive supply- rail potential at Terminal 7. This condition of essentially zero current drain in the output stage under the strobed “OFF” condition can only be achieved when the ohmic load resistance presented to the amplifier is very high (e.g., when the amplifier output is used to drive MOS digital circuits in comparator applications). Input Stage - The circuit of the CA3160 is shown in the Schematic Diagram. It consists of a differential-input stage using PMOS field-effect transistors (Q6, Q7) working into a mirror-pair of bipolar transistors (Q9,Q10) functioning as load resistors together with resistors R3 through R6. The mirror- pair transistors also function as a differential-to-single-ended converter to provide base drive to the second-stage bipolar transistor (Q11). Offset nulling, when desired, can be effected by connecting a 100,000 Ω potentiometer across Terminals 1 and 5 and the potentiometer slider arm to Terminal 4. Cascode-connected PMOS transistors Q2, Q4, are the constant-current source for the input stage. The biasing circuit for the constant-current source is subsequently described. The small diodes D5 through D7 provide gate-oxide protection against high-voltage transients, including static electricity during handling for Q6 and Q7. Second-Stage - Most of the voltage gain in the CA3160 is provided by the second amplifier stage, consisting of bipolar 7 4 8 1 5 2 3 BIAS CURRENT “CURRENT SOURCE LOAD” FOR Q11 Q2 D1 D2 D3 D4 Z1 8.3V Q1 R1 40k Ω Q4 R2 5k Ω INPUT STAGE D5 NON-INV. INPUT INV. INPUT + - Q6 R3 1k Ω Q9 Q10 R5 1k Ω R6 1k Ω R4 1k Ω Q7 D6 D7 Q3 OFFSET NULL Q11 SUPPLEMENTARY COMP IF DESIRED STROBING SECOND OUTPUT Q8 Q12 STAGE STAGE Q5 V+ 2k Ω 30 pF 6 OUTPUT NOTE: Diodes D5 Through D7 Provide Gate Oxide Protection For MOSFET Input Stage. CURRENT SOURCE FOR Q6 AND Q7 CA3160, CA3160A |
Ähnliche Teilenummer - CA3160E |
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Ähnliche Beschreibung - CA3160E |
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