QT114 Datasheet, PDF (10/12 Pages) Quantum Research Group – CHARGE-TRANSFER QLEVEL SENSOR IC

4.1 ABSOLUTE MAXIMUM SPECIFICATIONS
Operating temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . as designated by suffix
Storage temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55^OC to +125^OC
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to +6.5V
Max continuous pin current, any control or drive pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20mA
Short circuit duration to ground, any pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
Short circuit duration to VCC, any pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
Voltage forced onto any pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to (Vcc + 0.6) Volts
4.2 RECOMMENDED OPERATING CONDITIONS
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5 to 5.25V
Supply ripple+noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mV p-p max
Load capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 50pF
Cs value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10nF to 100nF
4.3 AC SPECIFICATIONS Vcc = 3.0, Ta = recommended operating range
Parameter
Description
Min
Typ
Max
Units
Notes
TPC
Charge duration
2
µs
TPT
Transfer duration
4
µs
TBS
Burst spacing interval
75
ms
TBL
Burst length, time
0
3.5
ms
NLC
Maximum burst length counts
500
counts
TR
Response time
80
ms
Slosh filter disabled
TQ
QT pulse spacing
6
14
µs
TR
Pulse edge risetime
6
ns
Cx = 5pF
TF
Pulse edge falltime
4
ns
Cx = 5pF
THB
Heartbeat pulse width
300
350
400
µs
4.4 SIGNAL PROCESSING
Description
Min
Typ
Threshold, T1
250
Threshold, T2
150
Hysteresis
3
Slosh filter length, time
15
Slosh filter length, counts
190
Note 1: Counts of burst
Note 2: Uninterrupted detection / non-detection: Strap option.
Max
Units
counts
counts
counts
seconds
counts
Note 1
Note 1
Note 1
Note 2
Note 1
Notes
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