(ACTIVE) Ultrasonic Sensing Analog Front End for Level, Concentration & Flow Sensing


Functional Diagram


The TDC1000 is a fully integrated analog front-end (AFE) for ultrasonic sensing measurements of level, fluid identification/concentration, flow, and proximity/ distance applications common in automotive, industrial, medical, and consumer markets. When paired with an MSP430/C2000 MCU, power, wireless, and source code, TI provides the complete ultrasonic sensing solution.

TI's Ultrasonic AFE offers programmability and flexibility to accommodate a wide-range of applications and end equipment. The TDC1000 can be configured for multiple transmit pulses and frequencies, gain, and signal thresholds for use with a wide-range of transducer frequencies (31.25kHz to 4MHz) and Q-factors. Similarly, the programmability of the receive path allows ultrasonic waves to be detected over a wider range of distances/tank sizes and through various mediums.

Selecting different modes of operation, the TDC1000 can be optimized for low power consumption, making it ideal for battery powered flow meters, level instrumentation, and distance/proximity measurements. The low noise amplifiers and comparators provide extremely low jitter, enabling picosecond resolution and accuracy for zero and low flow measurements.


  • Automotive AEC-Q100 (TDC1000-Q1)
  • Measurement Range: Up to 8 ms
  • Operating Current: 1.8 µA (2 SPS)
  • Transmitter Channels TX1/TX2:
    • Supports Single or Dual-Transducer
    • Programmable Excitation: 31.25 kHz to 4 MHz,
      Up to 31 Pulses
  • Receiver Channels RX1/RX2:
    • STOP Cycle-to-Cycle Jitter: 50 psRMS
    • Low-Noise and Programmable Gain Amplifiers
    • Access to Signal Chain for External Filter
    • Programmable Threshold Comparator for Echo
    • Automatic Channel Swapping for Differential
      Time-of-Flight (TOF) Measurement
    • Programmable Low Power Mode for Long TOF
  • Temperature Measurement
    • Interface to Two PT1000/500 RTDs
    • RTD-to-RTD Matching Accuracy 0.02°CRMS
  • Operating Temperature Range: –40°C to 125°C


Number of input channels 2    
Interface SPI    
Active Supply Current (Typ) (mA) 2.74    
Sleep Supply Current (Typ) (uA) 0.61    
Supply Voltage (Max) 5.5    
Supply Voltage (Min) 2.7    
Rating Catalog    
Operating Temperature Range (C) -40 to 125    
Package Group TSSOP|28    
Package Size: mm2:W x L (PKG) 28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP|28)    
Approx. Price (US$) 1.80 | 1ku    
Features Time of flight    

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Datasheet (1)

Application notes (8)

User guides (3)

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