Ultrasonic Flow Converters

TDC-GP22 ULTRASONIC FLOW CONVERTERS

Ultrasonic Flow Converter with Integrated Analog Frontend

TDC-GP22 is an integrated ultrasonic flow converter front end.

It is a 100% pin and functionally compatible upgrade to TDC-GP21. It has additional functionality compared to the TDC-GP21 – the first hit detection and the patented signal strength monitoring by pulse width measurement. This makes it the first complete and easy to use front-end chip for ultrasonic water meters and heat meters.

The TDC-GP22 has analog elements like the fire-pulse generator, zero-crossing detection and analog switches that simplify the design of ultrasonic flow meters. The first-hit detection makes TDC-GP22 suitable for high dynamic range ultrasonic water meters. The optimized power management of the various subsystems allows the operating current to be only a few µA at 2 Hz measurement rate.

The TDC-GP22 is a good front-end solution for designing compact, low-cost ultrasonic flow meters and heat meters.

For even higher integration and lower current consumption, please see the TDC-GP30.

Ultrasonic Flow Converters (UFC)

AS6040

TDC-GP30

TDC-GP30-F01

TDC-GP21

TDC-GP22

KEY FEATURES

2-channel TDC with 22ps resolution
Analog frontend for ultrasonic flow meters
Chopper-stabilized low-offset comparator for zero crossing detection
Precise windowing for hit selection
Temperature measuring unit for PT1000 sensors
QFN32 Package

KEY BENEFITS

High Precision
Low Power
Few Additional External Component Needed

General

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

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
20 ns pulse-pair resolution, 4-fold multiunit
Up to 1 million measurements per second in measure mode 1

Measurement Mode 2

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
3-fold multiunit capability with automatic processing of all 3 data

Special Functions

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
7×32 Bit EEPROM

Analog Input Circuit

Chopper-stabilized low-offset comparator, programmable, ±35 mV
First-wave detection: offset set zero automatically after first wave, hit selection relative to first wave
First-wave pulse-width measurement for signal monitoring and bubble detection
Integrated analog switches for input selection
External circuit is reduced to 2 resistors and 2 capacitors

Temperature Measurement Unit

Chopper-stabilized low-offset comparator, programmable, ±35 mV
First-wave detection: offset set zero automatically after first wave, hit selection relative to first wave
First-wave pulse-width measurement for signal monitoring and bubble detection
Integrated analog switches for input selection
External circuit is reduced to 2 resistors and 2 capacitors

TDC-GP22 PRODUCT FACTS

Analog Frontend	Yes
First Wave Detection	Yes
Amplitude Measurement
Number of Hits	3
Resolution [ps]	22
Operating Supply Range	2.5 to 3.6
Interface	SPI
CPU	–
Memory
GPIO	–
Ambient Temperature Range [°C]	-40°C to +125°C
Package	QFN32

Resolution

typ. 90 ps, 45 ps in double resolution mode, 22 ps in quad resolution mode (only Measure Mode 2)

OTHER SPECS

Max data rate:	up to ½ million samples per second
Power supply voltage:	2.5 V to 3.6 V
Operating temp:	-40°C to 125°C
Quiescent current:	< 0.1µA
INL:	< 0.1 LSB
DNL:	< 0.8 LSB

GP22 DC PARAMETERS

TEMPERATURE MEASURING UNIT

MEASURING UNIT

Documentation & Downloads

Datasheet

Screencasts

Software

Description

Software TDC-GP30 / TDC-GP30-F01
Software package for GP30 Demo Kit

Version

V1.6.0

Size

240MB

Download

acam_GP30-DEMO-KIT.zip

Datasheet

Software

PCN/PDN (Product Change / Discontinuation Notes)

Ordering Numbers

Type	Part number	Package	RoHS compl.	Shipping package
TDC-GP22:
TDC-GP22	MNR 1949	QFN32	Yes	Tray
TDC-GP22	MNR 1950	QFN32	Yes	Tape & Reel (5k)
GP22-EVA-KIT	MNR 1951	System	Yes	Box
GP22-DEMO-KIT	MNR 1979	System	Yes	Box
TDC-GP21:
TDC-GP21	MNR 1839	QFN32	Yes	Tray
TDC-GP21	MNR 1720	QFN32	Yes	Tape & Reel (3K/5K)
GP21-EVA-KIT	MNR 1781	System	Yes	Box
TDC-GP2:
TDC-GP2	MNR 1058	QFN32	Yes	Tray
TDC-GP2	MNR 1480	QFN32	Yes	Tape & Reel (2k)
TDC-GP1:
TDC-GP1	MNR 278	TQFP44	Yes	Tray
TDC-GPX:
TDC-GPX	MNR 975	TQFP100	Yes	Tray
TDC-GPX-FG	MNR 1089	TFBGA120	Yes	Tray

Ordering Numbers

Type	Part number	Package	RoHS compl.	Shipping package
TDC-GP22:
TDC-GP22	MNR 1949	QFN32	Yes	Tray
TDC-GP22	MNR 1950	QFN32	Yes	Tape & Reel (5k)
GP22-EVA-KIT	MNR 1951	System	Yes	Box
GP22-DEMO-KIT	MNR 1979	System	Yes	Box
TDC-GP21:
TDC-GP21	MNR 1839	QFN32	Yes	Tray
TDC-GP21	MNR 1720	QFN32	Yes	Tape & Reel (3K/5K)
GP21-EVA-KIT	MNR 1781	System	Yes	Box
TDC-GP2:
TDC-GP2	MNR 1058	QFN32	Yes	Tray
TDC-GP2	MNR 1480	QFN32	Yes	Tape & Reel (2k)
TDC-GP1:
TDC-GP1	MNR 278	TQFP44	Yes	Tray
TDC-GPX:
TDC-GPX	MNR 975	TQFP100	Yes	Tray
TDC-GPX-FG	MNR 1089	TFBGA120	Yes	Tray

TDC-GP22 ULTRASONIC FLOW CONVERTERS

Ultrasonic Flow Converters (UFC)

KEY FEATURES

KEY BENEFITS

General

Measurement Mode 1

Measurement Mode 2

Special Functions

Analog Input Circuit

Temperature Measurement Unit

TDC-GP22 PRODUCT FACTS

Analog Frontend

Yes

First Wave Detection

Yes

Amplitude Measurement

Number of Hits

3

Resolution [ps]

22

Operating Supply Range

2.5 to 3.6

Interface

SPI

CPU

–

Memory

GPIO

–

Ambient Temperature Range [°C]

-40°C to +125°C

Package

QFN32

Resolution

OTHER SPECS

GP22 DC PARAMETERS

TEMPERATURE MEASURING UNIT

MEASURING UNIT

Documentation & Downloads

Datasheet

Application Notes

Screencasts

Software

Description

Version

Size

Download