11
CALIBRATION2 CALIBRATION1
(4354
2179)
calCount
2175
(CALIBRATION2 _ PERIODS) 1
(2) 1
(CLOCKperiod)
(1/ 8MHz)
normLSB
57.4ps
(calCount)
2175
TOF1
normLSB(TIME1 TIME2) (CLOCK _ COUNT1)(CLOCKperiod)
TOF1
(5.74 10
)(1688 1667) (152)(1/ 8MHz)
TOF1 19.001us
n
n
n 1
n
n 1
n
TOF
(TIME1)(normLSB) offset
(CLOCK _ COUNT )(CLOCKperiod)
(TIME
)(normLSB) offset
TOF
normLSB(TIME1 TIME
) (CLOCK _ COUNT )(CLOCKperiod)
(CLOCKperiod)
normLSB
(calCount)
CALIBRATION2 CA
calCount
ª
º
ª
º
¬
¼
¬
¼
LIBRATION1
(CALIBRATION2 _ PERIODS) 1
GUI and Operation
12
SNAU198A – May 2016 – Revised May 2016
Copyright © 2016, Texas Instruments Incorporated
TDC7201-ZAX-EVM
where
•
TOFn [second] = time-of-flight measurement from the START to the nth STOP
•
normLSB [sec] = normalized LSB value from calibration
•
TIME1 = time 1 measurement given by the TDC7201 register address 0x10
•
TIME
n+1
= (n+1) time measurement given by the TDC7201 register addresses 0x12, 0x14, 0x16, 0x18,
and 0x1A
•
CLOCK_COUNTn = nth clock count values in register addresses 0x11, 0x13, 0x15, 0x17, and 0x19
•
CLOCKperiod [sec] = external CLOCK period
•
offset [sec]= constant measurement offset
•
CALIBRATION1 [count] = TDC count for first calibration cycle, located in register address 0x1B
•
CALIBRATION2 [count] = TDC count for second calibration cycle, located in register address 0x1C
•
CALIBRATION2_PERIODS = calibration count bits, located in register address 0x01
(1)
(2)
5. START_EXT2/STOP_EXT2 Testing
a. Modification to Input Signal Connections:
1. Disconnect USB-to-SMA cable connection to START_EXT1 (J5). Instead, reconnect channel 1
of the dual function generator to TDC7201EVM’s START_EXT2 connector (J8).
2. Disconnect USB-to-SMA cable connection to STOP_EXT1 (J4). Instead, reconnect channel 2
of the dual function generator to TDC7201EVM’s STOP_EXT2 connector (J7). See Figure 4.
b. Now repeat steps 1 through 4 from
with the following modification to step 2: Click on the
TDC720x
tab and make sure the
TDC7201: Select TDCx
field is as shown in
.