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SL1922 is a high-precision Time-to-Digital Converter (TDC) circuit. Internally, it integrates analog comparators, analog switches, Schmitt triggers, and other devices, thereby significantly simplifying external circuitry.
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Descriptions
SL1922 is a high-precision Time-to-Digital Converter (TDC) circuit. Internally, it integrates analog comparators, analog switches, Schmitt triggers, and other devices, thereby significantly simplifying external circuitry.
Additionally, it includes a first wave detection function internally, greatly enhancing its anti-interference capability. The programmable offset range of the internal comparator is ±35mV, which improves sampling accuracy. Users can assess the relative width of the first echo pulse to determine indications of received signal strength. This indication helps in detecting anomalies such as ultrasound transducer abnormalities, increased pipe wall coatings, or the presence of bubbles in water.
By issuing the command Start TOFRestart, SL1922 can complete a measurement of ultrasound time-of-flight (both upstream and downstream) and read data, thereby reducing software operations and power consumption significantly. It is compatible with TDC-GP22.
Features
Measurement range 1:
● Dual channel single precision mode 75ps
● Single channel double precision mode 37ps
● Measurement range 3.5ns (0ns) to 2.5μs
● 20ns minimum pulse interval, receives up to 4 pulses
Measurement range 2:
● Single channel single precision mode 75ps resolution
● Double precision mode 37ps, quad precision mode 19ps resolution
● Measurement range 500ns to 4ms(at4m high-speed clock)
● Measurement of 3 pulses and automatic processing of 3 data
Analogue input circuit:
● Chopper-stabilised low-drift comparator with programmable offset voltage, ±35 mv
● First wave detection
● Measures the pulse width of the first wave
● Analogue switches for input selection integrated inside
● External circuitry requires only 2 resistors and 2 capacitors
Temperature measurement unit:
● 2 or 4 temperature sensors, pt500/pt1000 or higher
● Has an internal integrated schmitt trigger
● 16-bit rms progress with external schmitt trigger, 17.5-bit rms precision with internal low-noise trigger
● Ultra-low power consumption (0.08μa at measurements every 30 seconds)
Special features:
● Pulse generator for up to 127 pulses
● Rising or/and falling edge triggered measurements
● High-precision stop shield window
● Low power 32k oscillator (500na)
● 7 x 32-bit EEPROM
Overview:
● 4 line spi communication interface
● Operating voltage 2.5v to 3.6v
● Operating temperature -40°c to +125°c
● Qfn32/lqfp32 package
Applications
● ultrasonic heat meter, water meter
● laser distance measurement
| File Name | Title | Description |
|---|---|---|
| SL1922.pdf | SL1922 | - |
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