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Time-to-Digital Converter

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Time-to-Digital Converter

The QTDC-16CH-0A is a compact, high-precision measurement instrument featuring 16 acquisition channels and a time resolution of 10 ps. This time measurement device can record event time information in real time and supports the creation of histograms based on different bin values or statistical time settings. It also offers customizable features such as time coincidence detection and time-digit calculations. Utilizing 10G UDP Ethernet/USB3.0 interface protocols for raw data transmission, it enables secondary development and can be widely applied in scientific research fields such as laser after-pulse distribution measurement, quantum optics, and LiDAR.

Features:

-16-channel raw time data acquisition

-10 ps time resolution

-Single-channel saturation count of 20 Mcps

-Jitter less than 20 ps

-Supports customized compliance counting function

Data sheet:

Datasheet

522KB

INDICATOR PARAMETERS

TECHNICAL PARAMETER	SPECIFICATION
Product Model	TDC-16CH-0A
Number of Channels	4/8/16
Time Measurement Resolution	<10 ps (related to working mode)
Standard Deviation (Std)	≤ 20 ps (related to working mode)
Saturation Event Detection	20 Mcps/channel
Dynamic Range	≥ 1 ms
Interface Type & Input Impedance	SMA/50 Ω
Data Transmission Interface	10G UDP/USB 3.0
Configuration Interface	RS232
Input Voltage Level	3.3 V TTL
Dimensions	≤ 20 cm * 15 cm * 5 cm
Operating Temperature	-40°C to +125°C
Histogram Statistical Channels	4 channels
Bin Setting	2^m ps (m defaults to 3)

Histogram Reporting Frame Format

Frame Header	Length	Identifier	Sequence	CMD	Data	Checksum
Histogram 1	A3A2_A1A0	n	0010_0000	0010_0001	DATA0~n-1	CHECKSUM
Histogram 2	A3A2_A1A0	n	0010_0000	0010_0002	DATA0~n-1	CHECKSUM
Histogram 3	A3A2_A1A0	n	0010_0000	0010_0003	DATA0~n-1	CHECKSUM
Histogram 4	A3A2_A1A0	n	0010_0000	0010_0004	DATA0~n-1	CHECKSUM

table 1-1

The length only represents the size of the data field in units of 32 bits.
The checksum is the sum of all fields from the frame length to the checksum field, calculated as: Checksum = Length + Identifier + Sequence + CMD + Data.
Histogram 1 through Histogram 4 reporting frames are distinguished by their sequence values.
The data field corresponds to the number of statistical data points for the specified statistical range.
In 10G Ethernet communication, all data is transmitted as 64-bit values, using little-endian format, concatenated as per Table 1-2.

Histogram Reporting 10G Ethernet Output Format

Data Type	Frame Content
Odd Number of Data Points	{32’d0, Frame Header} {Length, Identifier} {Sequence, CMD} … {DATAn-1, Checksum}
Even Number of Data Points	{32’d0, Frame Header} {Length, Identifier} {Sequence, CMD} … {DATAn-2, DATAn-1} {Checksum, 32’d0}

table 1-2

TDC Raw Data Reporting Frame Format

Frame Content

{32’d0, Frame Header} {Length, Identifier} {Sequence, CMD} Data Checksum

table 1-3

Format Example: 64’h0000_0000_A3A2_A1A0 (32’d2n, 32’h0020_0000) XXXX_XXXX_0000_0001 DATA0~n-1 CHECKSUM

The length represents the size of the data field in units of 32 bits. If there are ndata points, the length is 2n.
The checksum is calculated as the sum of all fields from the frame length to the checksum, using 32-bit addition.
All data is transmitted in little-endian format.
The data field in the TDC raw data reporting frame is 64-bit, with a format specified in Table 1-4. The unit of the data is 1 ps.

TDC Raw Data Format

Field	Bit Range	Description
Data Header	[63:60]	Fixed Value: 8’hf5
Channel Number	[59:56]	Values: 4’d0~4’d15
Padding	[55:44]	Reserved: 12’d0
TDC Data	[43:0]	44-bit time data