TDC1000PWR

The TDC1000 is a fully integrated ultrasonic sensing analog front-end (AFE) commonly used in liquid level, liquid identification/concentration, flow, and proximity/remote sensing applications. When used in conjunction with MSP430/C2000 MCUs, power supplies, wireless networks, and source code, it provides a complete ultrasonic sensing solution. It is programmable and flexible, suitable for a wide range of applications and end devices. It can be configured for various transmit pulses and frequencies, gains, and signal thresholds for use with multiple sensor frequencies (31.25 kHz to 4 MHz) and Q factors. The receive path is programmable, enabling the detection of ultrasonic waves propagating through various media over longer distances/larger tank sizes. Different operating modes can be selected, and it is optimized for low power consumption, making it an ideal choice for battery-powered flow meters, liquid level gauges, and distance/proximity sensing measurement devices. The low-noise amplifier and comparator generate extremely low jitter, enabling picosecond-level resolution and accuracy for zero and low flow measurements.

Applications

• Measurements in tanks with different materials: liquid level, liquid identification/concentration
• Flow metering: water, gas, heat
• Remote/proximity sensing

Key features

• Automotive AEC-Q100 compliant (TDC1000-Q1)
• Measurement range: up to 8ms
• Operating current: 1.8μA (2 SPS)
• Transmitter channels TX1/TX2: single or dual sensor support
• Programmable excitation: 31.25kHz to 4MHz, up to 31 pulses
• Receiver channels RX1/RX2: STOP cycle-to-cycle jitter: 50ps RMS
• Low-noise, programmable gain amplifier
• Signal chain design with accessible external filter
• Programmable threshold comparator for echo quality detection
• Automatic channel swap for differential TOF measurement
• Programmable low-power mode for extended TOF measurement
• 2× PT1000/500 RTD interface, matching accuracy between RTDs: 0.02°C RMS
• Operating temperature range: -40°C to 125°C