Datasheet
DS000586
AS6501
2-Channel Time-to-Digital Converter
v1-00 • 2018-May-11
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AS6501
Content Guide
Content Guide
1
1.1
1.2
1.3
General Description....................... 3
Key Benefits & Features .............................. 3
Applications .................................................. 4
Block Diagram .............................................. 4
2
3
3.1
3.2
Ordering Information ..................... 5
Pin Assignment ............................. 6
Pin Diagram .................................................. 6
Pin Description ............................................. 7
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
Resolution .................................................. 32
Combining Two Stop Channels ................. 33
Input Pins for Time Measurement .............. 35
LVDS Output Interface ............................... 37
SPI Communication Interface .................... 40
Coding of Results ....................................... 44
Conversion Latency and Conversion Rate 46
Conversion Rate ........................................ 47
9
9.1
9.2
9.3
9.4
Application Information .............. 52
Configuration Examples ............................. 52
Example C++ Code .................................... 52
Schematic .................................................. 55
External Components ................................ 56
4
5
6
6.1
6.2
6.3
6.4
6.5
6.6
Absolute Maximum Ratings .......... 9
Recommended Operation
Conditions .................................... 10
Typical Characteristics ............... 12
Converter Characteristics ........................... 12
Power Supply Characteristics .................... 13
Reference Clock and Stop Input
Requirements ............................................. 14
LVDS Data Interface Characteristics ......... 15
Serial Communication Interface ................. 17
Typical Operating Characteristics .............. 19
10
11
12
13
14
Package Drawings & Markings... 58
Reel Information .......................... 60
Soldering & Storage Information 61
Revision Information ................... 62
Legal Information ........................ 63
7
7.1
7.2
Register Description.................... 22
Register Overview ...................................... 22
Detailed Register Description..................... 23
8
8.1
Detailed Description .................... 30
Time Measurements and Results .............. 30
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AS6501
General Description
1
General Description
The AS6501 is a high performance time-to-digital converter (TDC) frontend device. Highest
measurement performance and highest data throughput is achieved on two channels, each on with
LVDS stop inputs and LVDS serial outputs. High configuration flexibility and unlimited measurement
range cover many applications. They range from portable handheld laser range equipment to
ambitious time-of-flight measurements of highest performance, as e.g. done in medical imaging
applications.
AS6501 calculates all stop measurements inside, proportional to the applied reference clock.
Combinations of best single shot accuracy of 10 ps with lowest pulse-to-pulse spacing < 5ns and
maximum data throughput rate of 70 MSPS per stop input are possible.
1.1
Key Benefits & Features
The benefits and features of AS6501,
2-Channel Time-to-Digital Converter,
are listed below:
Figure 1:
Added Value of Using AS6501
Benefits
Features
●
2 stop channels with serial 20 ns pulse-to-
pulse spacing and maximum 35 MSPS
●
1 combined channel with 5 ns pulse-to-pulse
spacing and maximum 70 MSPS
●
Single shot accuracy 20 ps rms single shot
resolution per channel or 10 ps rms with high
resolution option
●
Unlimited measuring range 0 s to 16 s
●
Differential reference clock input 2 MHz to
12.5 MHz
●
Inputs optional with LVDS (or CMOS level)
●
LVDS serial output per channel
●
16-stage FIFO per channel
●
Automatic calibration to reference clock (no
PLL or DLL)
●
SPI compatible 4-wire interface for
configuration
●
●
●
●
Supply voltage 3.3 V
Power dissipation 60 mW to 260 mW
Standby current 60 µA
QFP48 package (7 mm x 7 mm)
●
Simple data post-processing thanks to
calibrated results
●
Event assignment thanks to reference clock
index simplifies coincidence measurements
●
Easy pulse width measurements
●
High efficiency thanks high sample rate
●
Compact design thanks to small package
and low number of external components
●
Reduced cooling thanks to low power
consumption
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AS6501
General Description
1.2
Applications
●
●
●
●
●
●
Automated test equipment
Laser range measurement
Medical imaging
Time-of-flight measurement
Particle physics
Lidar
1.3
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
Functional Blocks of AS6501
DVDD33
DVDD18
DVDD33
TVDD33
TVDD18
RVDD33
CVDD18
DVDD18
TVDD33
TVDD18
LCLKINP
AS6501
STOPAP
STOPAN
Encoder
Serializer
44:1 ... 14:1
LCLKINN
TDC
FIFO
SDOAP
SDOAN
FRAMEAP
FRAMEAN
STOPBP
STOPBN
TDC
FIFO
Encoder
Serializer
44:1 ... 14:1
SDOBP
SDOBN
FRAMEBP
FRAMEBN
RSTIDXP
RSTIDXN
Reference
Clock
Index
Counter
Encoder
Configuration
LVR
LCLKOUTP
LCLKOUTN
VDD18O
REFCLKP
REFCLKN
TDC
Serial Interface
TGND
TGND
DGND
DGND
RGND
TGND
INTERRUPT
SCK
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AS6501
Ordering Information
2
Ordering Information
Ordering Code
AS6501-FLQM
Package
QFP48
Marking
AS6501
Delivery Form
T&R
Delivery Quantity
500 pcs/reel
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