TDC-GPX2 datasheet(49/77 Pages) AMSCO

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ams Datasheet

Page 49

[v1-03] 2017-Dec-18

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TDC-GPX2 − Detailed Description

Examples for Codes of Time Measurements Results

Figure 53:

LSB Configuration

Note(s):

1. Time difference exceed GPX2 specification for reference clock period

2. REFCLK_DIVISIONS decreased by one is the highest possible readout value

3. With SPI read-out the four upper bits are unused

Readout of Stop Result

Resulting Stop Time with An Assumed LSB of

Note

Hexadecimal

Decimal

LSB = 1ps

LSB = 5ps

LSB = 10ps

0x0

0ps

0x1

1ps

5ps

10ps

0x2

2ps

10ps

20ps

0xA

10ps

50ps

100ps

0x64

100

100ps

500ps

1000ps

0x3E8

1000

1000ps

5000ps

10000ps

0x2710

10000

10000ps

50000ps

100000ps

0x61A7

24999

24999ps

124995ps

249990ps

refclk-period

tREFCLK =250ns

0xC34F

49999

49999ps

249995ps (2)

See note (1)

0x3D08F

249999

249999ps (2)

See note (1)

0x1869F

99999

99999ps

499995ps

See note (1)

refclk-period

tREFCLK =500ns

0x30D3F

199999

199999ps

See note (1)

0xF423F

999999

See note (1)

0x3FFF

16383

16383ps

81915ps

163830ps

LVDS:

Max readout

with stop_data_

bitwidth=

14Bit

0xFFFF

65335

65335ps

326675ps

653350ps

16Bit

0x3FFFF

262143

262143ps

See note (1)

18Bit

0xFFFFF

1048575

1048575ps

See note (1)

20Bit

0x0FFFFF

1048575

1048575ps

See note (1)

SPI:

Max readout with 20Bit (3)

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