TIDA-01427

The TIDA-01427 reference design provides a solution for differential signal chain used for generating a time-varying control voltage (VCNTL) to drive multiple AFE devices in a parallel configuration. TI's low-noise analog front ends (AFEs) for medical ultrasound have a time gain control (TGC) feature that helps achieve best possible signal-to-noise ratio (SNR) for ultrasound applications. This reference design uses dual multiplying DACs (DAC8802) followed by current-to-voltage converters (OPA2209) to generate a 20-V swing. After filtering this 20-V swing with a multiple feedback filter (THS4130), it is attenuated to 1.5-V using a passive attenuator. The design can be powered using a ±15 or 5-V supply (onboard Fly-Buck converter LM5160 converts a 5-V input to ±15-V rails). The clean power suppplies for the entire signal chain are generated using the TPS7A39 and TPS7A47. The ±10-V references for the DAC are generated using the REF5010 and OPA2209.

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