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Time to Digital Converters
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TDC - GP21
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Time-to-Digital Applications
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Time to Digital Converters for Digital Strain Gage
PICOSTRAIN PS08
PICOSTRAIN PS081
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PICOSTRAIN PS021
Strain Gage Applications
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Time to Digital Converters for Capacitance Measurement
PICOCAP PCap01
PICOCAP PS021
PICOCAP PSA21
Capacitance Applications
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Time to Digital Converters for Speed Sensors
PICOTURN 2G
PICOTURN BM/SM
Speed Sensor Applications
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TDC GP21 - Universal 2-Channel Time-to-Digital Converter

TDC-GP21 the GP2 Next Generation TDC

TDC-GP21 is an enhancement to the TDC-GP2. The GP21 has added some new features for extended functionality and improvements over the exisitng GP2.

Enhancements include: analog front end, pin-to-pin compatibility (for existing designs), analog stabilized comparator and simplified external circuit design, improved time and temperature measurement and reduced current.

TDC-GP21 is perfectly suited to design compact and low cost ultrasonic flow meters and heat meters. The enhanced analog front end allows a reduction in the number of external components.

Using integrated analog elements of the TDC-GP21, the average operating current of a typical ultrasonic flow meter application can be reduced to 2.2 μA.

TDC - Time-to-Digital Converters
TDC GP21 - Eval System Info
TDC GP21 - Data Sheet
TDC GP21 - Eval Kit Data Sheet

TDC-GP21
TDC Channel Resolution Maximum Range TDC Package
TDC GP21 2-channel
1-channel		 90 ps/45 ps
90/45/22 ps

0 ns to 2.4 μS
500 ns to 4 ms

 QFN 32 Package
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GP21 - General Circuit Features

Analog Input Circuit Temperature Measurement Unit Features
  • Chopper-stabilized low-offset comparator
  • 2 analog switches for input selection
  • External circuit reduced to 2 resistors, 2 capacitors
  • 2 or 4 sensors
  • PT500/PT1000 or higher
  • Schmitt trigger integrated
  • Very high resolution
  • Ultra low current (0.08 μA measuring every 30 s)
Special Functions General Features
  • Fire pulse generator, up to 127 pulses
  • Trigger to rising and/or falling edge
  • Precise stop enable by windowing
  • Low-power 32 kHz oscillator (500 nA)
  • Clock calibration unit
  • 7x32 Bit EEPROM
  • 4-wire SPI interface
  • 1 MHz continuous data rate max.
  • I/O voltage 2.5 V to 3.6 V
  • Core voltage 2.5 V to 3.6 V
  • Temperature range – 40 °C to +125°C
  • QFN 32 package
Measurement Mode 1 Measurement Range 2
  • 2 channels with typ. 90 ps resolution
  • 1-channel double resolution with typ. 45 ps
  • Range 3.5 ns (0 ns) to 2.5 μs
  • 22 ns pulse-pair resolution, 4-fold multihit
  • Up to 1 million measurements per second
  • 1 channel with typ. 90 ps resolution
  • Double resolution mode with 45 ps
  • Quad resolution mode with 22 ps resolution
  • Measurement range 500 ns to 4 ms
  • 2 x CLKHS pulse-pair resolution 3-fold multihit capability
  • Each of 3 events can be assigned to an adjustable measuring window with 10 ns resolution
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TDC GP21 - Block Diagram and Package Outline

TDC Block Diagram

TDC Package Outline

Gp-21 Block Diagram Gp-21 Package

Click image for closeup view

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TDC Applications
Ultrasonic Heat Meters Ultrasonic Flow Meters Laser Range Finders
Laser Scanners Magnetostrictive Positioning