Ideal choice for industrial instrumentation applications: high-speed and high-precision bipolar amplifier CBM27
  • Released:2021-09-16 00:00:03
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CBM27A/27G provides excellent low noise and high-precision amplification performance for low-level signals. The product is widely used in stable integrators, precision summation amplifiers, precision voltage threshold detectors, comparators, and professional audio circuits, such as magnetic heads and microphone preamplifiers.

CBM27A/27G provides excellent low noise and high-precision amplification performance for low-level signals. The product is widely used in stable integrators, precision summation amplifiers, precision voltage threshold detectors, comparators, and professional audio circuits, such as magnetic heads and microphone preamplifiers.



CBM27A/27G Applications


Thermostats are a prevalent type of temperature monitoring and control system in our daily lives, utilized in various appliances such as underfloor heating water heaters, air conditioners, and ovens found in households. The CBM27A/27G, when connected to a thermistor, relays the measured values back to the processor. Shown below is a typical application schematic for a thermostat:

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The red portion in the diagram represents Corebai's recommended chip, with the following details: COREBAI Part Number: OPA: CBM27A/27G


CBM27A/27G Typical Features



Supply operation: 8V (±4V)~36V (±18V)

Low noise: 90 nV p-p(0.1 Hz to 10 Hz) 

High open-loop gain: 1800 V/mV

Low drift: 0.2 µV/°C

High speed: 2.8 V/µs slew rate, 8 MHz gain bandwidth

CMRR: 130 dB at VCM of ±11 V

Maximum noise spectral density

    CBM27A . . . 3.9 nV/√Hz @ 1 kHz Max CBM27G . . . 5.0 nV/√Hz @ 1 kHz Max

Low input offset voltage

CBM27A . . . 26 μV Max

CBM27G . . . 100 μV Max

Low input offset voltage drift

CBM27A . . . 0.2 μV/°C

CBM27G . . . 0.4 μV/°C



CBM27A/27G Product Highlights



Input offset voltage as low as 26μV and drift of only 0.2 μV/°C, this device is an ideal choice for precision instrumentation applications. Its extremely low noise (en = 3.5nV/√Hz at 10 Hz), low 1/f noise corner frequency (2.7 Hz), and high gain (1800 V/mV) enable accurate amplification of low-level signals.

An 8 MHz gain bandwidth product and a 2.8 V/µs slew rate ensure excellent dynamic accuracy in high-speed data acquisition systems.

The output stage boasts strong load driving capability, delivering a ±10 V guaranteed swing (with a 600 Ω load) and low output distortion, making the CBM27 an outstanding option for professional audio applications.

Both the power supply rejection ratio (PSRR) and common mode rejection ratio (CMRR) exceed 120 dB. Coupled with a long-term drift of just 0.2 μV/month, these characteristics facilitate easy attainment of high-performance levels in circuit designs.

Offering enhanced design flexibility, the product operates reliably across a wide temperature range from -40°C to +125°C and under all supported power supply modes. It is compatible with ADI, PMI, and LTC OP27 series products.



CBM27A/27G Typical Electrical Characteristics Diagram



   CBM27A/27G Graphs of Several Key Parameter Characteristics as follows:



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