The opening overview

In today's era of rapid advancements in industrial automation and portable electronic devices, multi-channel digital-to-analog converters (DACs) face the triple technical challenges of high precision, low power consumption, and wide temperature adaptability. Corebai Microelectronics has introduced the CBM53D04、CBM53D14、CBM53D24 series of four-channel buffered voltage output DACs. These DACs feature 8/10/12-bit full-range resolution, a 500μA low-power architecture, and an industrial-grade wide temperature design from-40℃ to 105℃, setting a benchmark for domestic products that break the overseas monopoly. The series uses dual-buffer synchronous control logic and compatible interfaces with SPI, QSPI, MICROWIRE, and DSP, addressing the timing deviation issues in traditional DACs during multi-channel synchronous updates. Additionally, the series offers rail-to-rail output characteristics and an ultra-low power consumption of 80nA in sleep mode, providing a system solution that combines high performance with low energy consumption for applications such as medical imaging, industrial control, and portable instruments.

 

1、Industry pain points: The core challenges of traditional DAC technology

1.1 The contradiction between low power consumption and high performance: the endurance of portable devices

In the field of portable medical devices, traditional 12-bit four-channel DACs typically consume more than 1mW of power at full scale. A handheld chromatograph using a traditional solution has a battery life of only 2.5 hours, whereas the CBM53D series consumes only 500μA at 3V, a 40% reduction from traditional solutions, making it suitable for lithium battery power. In industrial wireless sensor networks, traditional DACs often have a sleep current exceeding 1μA, while the CBM53D series has a sleep current as low as 80nA at 3V, meeting the requirements for long-term battery operation.

1.2 Accuracy attenuation in wide temperature environment: reliability challenges in industrial scenarios

In the fields of steel metallurgy and oil exploration, equipment must operate stably within a temperature range of-40℃ to 105℃. The typical temperature coefficient for ordinary DACs is ±20ppm/℃, with a full-temperature gain error of ±0.2%FSR. The CBM53D series features a temperature compensation design that controls the gain error to ±0.75%FSR at 85℃, meeting the precision requirements for industrial control.

1.3 Multi-channel synchronous control problem: precision barrier in medical and industrial applications

When multi-channel sampling clock deviation is required for CT scanners and other devices, the update of traditional DAC on-chip registers has a timing difference of 20-50ns. CBM53D series dual-buffer input logic supports four-way output synchronous update to avoid medical image artifacts and multi-joint collaborative errors of industrial robots.

2、Product breakthrough: Technical advantages of CBM53D series

In view of the core pain points of the industry, CBM53D series has achieved breakthroughs through three technical dimensions. The following is a detailed analysis of each functional point

 

2.1 Ultra low power architecture design

 Dynamic power control: 500μA in standard mode at 3V supply, and only 80nA (3V) in sleep mode to balance battery life and real-time performance.

 Power management: 2.5V~5.5V Wide voltage input, power common mode suppression ratio-60dB, effectively suppresses the impact of ±10% power fluctuations on output accuracy, suitable for complex power supply environment in industrial scenarios.

2.2 High precision conversion and wide temperature adaptation

 Resolution and Linearity: With a 12-bit resolution, the CBM53D24 features an integration nonlinearity (INL) of ±2LSB and a differential nonlinearity (DNL)±0.2LSB). It operates within an output voltage range of 0V to VREF. The device features an integrated rail-to-rail buffer amplifier, with a DC output impedance of just 0.5Ω. It can reliably drive 2kΩ loads and 500pF capacitive loads, achieving a short-circuit current of 25mA at 5V.

 Reference input characteristics: reference input voltage range 0.25V~VDD, typical impedance 45kΩ, it is recommended to use an external buffer to optimize the stability of the reference in a wide temperature environment.

 Temperature stability: -40℃~105℃ working temperature range, 85℃ gain error ±0.75%FSR, ESD protection is implied in the industrial design.

 

2.3 Flexible interface and synchronous control

 Serial interface: 3-wire SPI compatible interface with a maximum clock frequency of 30MHz and binary complement/offset code output.

 Double buffer logic: the LDAC bit is used to control the register update, so as to realize the synchronous refresh of four output channels and avoid timing deviation.

 

2.4 All parameters

 

3、 application scenarios

3.1 Medical diagnostic equipment

 Handheld ultrasound instrument: CBM53D24 has 12-bit resolution (LSB=5V/4096≈12.2μV) and 0.7V/μs pressure swing rate, with quantization error as low as 12.2μV, suitable for echo signal acquisition; sleep mode 80nA current extends the endurance of the device.

 Electrocardiogram monitor: four-way output drive lead amplifier, double buffer synchronous update to ensure the accuracy of QRS wave group acquisition.

3.2 Industrial automation control

 Temperature regulation of metallurgical furnace: CBM53D14's 10-bit resolution combined with-40℃~105℃ wide temperature design to achieve dynamic adjustment of multi-zone heating.

 Storage robot arm: CBM53D048-bit resolution drive solenoid valve group, to meet the requirements of switch control.

3.3 Communication and testing field

· Programmable power supply: The output voltage of CBM53D24 can be configured through SPI interface to achieve 12-bit accuracy adjustment within the range of 0V to VREF.