TDC7200_15 Datasheet, PDF (7/50 Pages) Texas Instruments – TDC7200 Time-to-Digital Converter for Time-of-Flight Applications in LIDAR,Magnetostrictive and Flow Meters

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TDC7200
SNAS647C – FEBRUARY 2015 – REVISED AUGUST 2015
7.5 Electrical Characteristics
T_A = 25°C , VDD = 3.3 V, GND = 0 V (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN TYP
TDC CHARACTERISTICS
LSB
Resolution
Single shot measurement
55
T_ACC-2
Accuracy (Mode 2) ⁽¹⁾
CLOCK = 8 MHz
28
Measured time = 100 µs
50
T_STD-2
Standard Deviation (Mode 2)
Measured time = 1 µs
35
OUTPUT CHARACTERISTICS: TRIGG, INTB, DOUT
V_OH
Output voltage high
Isource = -2 mA
V_OL
Output voltage low
Isink = 2 mA
INPUT CHARACTERISTICS: ENABLE, START, STOP, CLOCK, DIN, CSB,SCLK
C_in
Input capacitance ⁽²⁾
POWER CONSUMPTION (see Measurement Mode 1 and Measurement Mode 2)
2.31 2.95
0.35
3
I_sh
Shutdown current
I_QA
Quiescent Current A
I_QB
Quiescent Current B
I_QC
Quiescent Current C
EN = LOW
EN = HIGH; TDC running
EN = HIGH; TDC OFF, Clock Counter running
EN = HIGH; measurement stopped, SPI
communication only
0.3
1.35
71
87
I_QD
Quiescent Current D
TDC OFF, counter stopped, no communication
50
(1) Accuracy is defined as the systematic error in the output signal; the error of the device excluding noise.
(2) Specified by design.
MAX UNIT
ps
ps
ps
ps
V
0.99 V
pF
2 µA
mA
µA
µA
µA
7.6 Timing Requirements
TIMING REQUIREMENTS: START, STOP INPUTS, CLOCK
PW_START
Pulse width for Start Signal
PW_STOP
Pulse width for Stop Signal
SERIAL INTERFACE TIMING CHARACTERISTICS (VDD = 3.3 V, f_SCLK = 20 MHz) (See Figure 1)
f_SCLK
SCLK Frequency
t₁
SCLK period
t₂
SCLK High Time
t₃
SCLK Low Time
t₄
DIN setup time
t₅
DIN hold time
t₆
CSB fall to SCLK rise
t₇
Last SCLK rising edge to CSB rising edge
t₈
Minimum pause time (CSB high)
t₉
Clk fall to DOUT bus transition
MIN NOM
10
10
50
16
16
4
4
6
6
40
MAX UNIT
ns
ns
20 MHz
ns
ns
ns
ns
ns
ns
ns
ns
12 ns
7.7 Switching Characteristics
T_A = 25°C , VDD = 3.3 V, GND = 0 V (unless otherwise noted).
PARAMETER
TEST CONDITIONS
WAKE UP TIME
T_{WAKEUP_PERIOD}
Time to be ready for
Measurement
LSB within 0.3% of settled value
MIN TYP MAX UNIT
300
µs
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