TLC2201ACD

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TLC2201ACD Application Field and Working Principle

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

The TLC2201ACD is an instrumentation amplifier circuit with several features specifically designed for industrial use. It is a differential input stage, low-noise amplifier with an output stage consisting of an adjustable gain rail-to-rail output buffer. The TLC2201ACD is a rail-to-rail DC input and output amplifier, which operates with power supplies ranging from a single 3V to ±15V. It has low input offset and thermal offset drift, a high input impedance, good common-mode rejection, and high output current. The device is ideal for a variety of applications such as transducer signal conditioning, bridge circuitry, low-level data acquisition, and low-level signal processing.

The TLC2201ACD employs a three-stage operational amplifier. The first stage is the input differential amplifier followed by a pair of CMOS field-effect transistors (FETs). This input stage provides wide dynamic range, high common-mode rejection, and low offset voltage. The second stage consists of an output buffer with adjustable gain. This stage provides rail-to-rail DC output capability, low-noise, and fast settling. The third stage employs a pair of complementary FETs to provide rail-to-rail input and output ranges.

The TLC2201ACD is optimized for a single 3V to ±15V power supply operation and is designed for low power dissipation. The device is designed to operate over an ambient temperature range of −40°C to +125°C. It is provided in an 8-pin dual-in-line package (DIP) as well as a small-outline integrated circuit (SOIC) package.

The internal architecture of the TLC2201ACD is shown in the figure. The input differential amplifier is formed by two N-channel differential pairs, Q1 and Q2, and two P-channel differential pairs, Q3 and Q4.The input common-mode range extends to the negative power supply rail. The feedback network of the amplifier is formed by two current sources, connected to the positive power supply rail and to the negative power supply rail. The current sources generate a fixed current that flows through the amplifier’s feedback resistors. The feedback resistors are connected in series and are adjusted externally to adjust the gain of the amplifier.

The output buffer consists of a pair of complementary totem pole outputs, consisting of an N-channel FET Q5 and a P-channel FET Q6. The output buffer provides rail-to-rail output swing, as well as low-noise output and fast settling. The output is connected to a pair of current source transistors, Q7 and Q8, with one connected to the positive power supply rail and the other connected to the negative power supply rail.

The TLC2201ACD is a versatile and reliable amplifier for low-level signal conditioning applications. It has low offset voltage, excellent common-mode rejection, wide input dynamic range, fast settling times, and adjustable gains. It provides rail-to-rail operation for all signal paths, low power consumption and is compatible with a single 3V to ±15V power supply. The device is provided in an 8-pin dual-in-line package (DIP) as well as a small-outline integrated circuit (SOIC) package.

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