Core Dialogue | Choosing the Right DAC Saves Half the Effort! CBM128S085 Pushes Precision to the Limit

The demand for DACs with "high precision + low power consumption + high reliability" is urgent in fields like smart manufacturing, healthcare, and industrial applications. However, the industry faces three major pain points: high power consumption of high-precision DACs makes them difficult to adapt for portable devices, complex multi-channel control with limited dynamic range, and output susceptibility to voltage/temperature interference in industrial environments. The CBM128S085 12 -bit 8-channel DAC from Corebai Microelectronics breaks through with three-dimensional performance, becoming the core solution that bridges the gap between demand and pain points.

The CBM128S085 delivers exceptional signal fidelity through its 12-bit high-resolution architecture: Integrating Nonlinearity (INL) of ±2 LSB and Differential Nonlinearity (DNL) of ±0.2 LSB with guaranteed monotonicity, effectively preventing signal distortion during conversion. With Total Harmonic Distortion plus Noise (THD+N) as low as-80 dB, it achieves an output noise of 14μV at 30kHz bandwidth and a spectral density of 80 nV/√Hz, meeting stringent precision requirements for medical measurements and precision control applications. The chip innovatively features dual external reference voltage design, where channels A~D share VREF1 and channels E~H share VREF2. With an input range of 0.5V to 1V and 45KΩ input impedance, it flexibly expands dynamic output ranges across channels, resolving the challenge of "single reference voltage failing to accommodate diverse needs" in multi-channel scenarios.

In terms of power consumption control and system compatibility, the CBM128S085 achieves precise balance: it consumes only 540μA current when powered at 3V without load, and only 600μA when powered at 5V. The core voltage supports 1.8V~3.6V to further reduce system power consumption. After all channels enter sleep mode, it enters uW-level power consumption mode, requiring only 10μA to maintain the power-off reset circuit. It also supports three sleep impedance options: high resistance, 2.5KΩ to ground, and 100KΩ to ground, maximizing battery life for portable devices. For control interfaces, the chip uses a three-wire serial interface with a maximum clock frequency of 40MHz, compatible with SPI™, QSPI, MICROWIRE, and DSP standards. The 1MHz continuous data output rate meets high-speed transmission requirements. It supports dual modes of WRM (write-only data register) and WTM (data + DAC register synchronous update). Combined with a 16-bit serial input register (4-bit mode control + 12-bit data), it enables broadcast updates, single-channel precise updates, and other operations. The daisy chain mode allows multiple chips to be connected in series through a single interface, achieving millisecond-level synchronous updates, significantly simplifying the wiring and control logic of multi-channel systems.

To meet the reliability and integration efficiency requirements for industrial applications, the CBM128S085 features a multi-faceted protection system: built-in power-on reset and power-off reset circuits ensure the output resets to 0V when the power supply rises to an effective voltage or falls below 2.7V, preventing abnormal voltage surges from affecting the system; it offers excellent ESD protection, with a human model withstand 5000V, a machine model 300V, and a charging device model 1000V, effectively resisting electrostatic interference; it operates within a temperature range of-40°C to 125°C and stores at-65°C to 150°C. Coupled with a typical output short-circuit protection of ±20mA, it ensures stable operation in harsh environments. In terms of integration and packaging design, the chip integrates an 8-channel DAC on a single chip, available in two small sizes: TSSOP16 (4.9~5.1mm×6.2~6.6mm) and QFN16. The QFN package's bottom pads also optimize heat dissipation, reducing PCB space by over 50% compared to the "multiple single-channel DAC combinations" approach, eliminating synchronization circuits between multiple components, and significantly lowering system BOM costs and production complexity.

Portable medical devices: featuring low power consumption and high precision, compatible with handheld ultrasound and pulse oximeters, powered by lithium batteries with wide voltage compatibility.

Industrial precision control: Dual reset function with industrial-grade PLC and servo drive, featuring wide temperature support, and simplified multi-channel management through a chrysanthemum chain configuration.

Test instrument: low distortion + 40MHz interface to meet the high speed and high fidelity signal output of oscilloscope and function generator.

Programmable power/sensor conditioning: The WRM/WTM dual-mode system delivers precise voltage control, with dual reference points supporting various sensor drivers.