PIC16C770 Microchip Technology Inc., PIC16C770 Datasheet - Page 116

• Manufacturer Part Number: PIC16C770
• Description: 18/20-pin, 8-bit Cmos Microcontrollers With 10/12-bit A/d
• Manufacturer: Microchip Technology Inc.

PIC16C717/770/771
EXAMPLE 11-3:
FIGURE 11-5: ANALOG INPUT MODEL
DS41120B-page 114
T
T
T
T
T
T
T
T
T
T
T
† The temperature coefficient is only required for
ACQ
ACQ
ACQ
ACQ
ACQ
C
C
C
C
C
C
temperatures > 25 C.
=
=
=
=
=
=
=
=
=
=
=
Holding Capacitor Charging Time
(C
-25 pF (1 k +10 k + 2.5 k ) In (1/16384)
-25 pF (13.5 k ) In (1/16384)
-0.338 (-9.704) s
3.3 s
HOLD
Amplifier Settling Time
+ Holding Capacitor Charging Time
+Temperature offset
5 s
+ T
+ [(Temp - 25 C)(0.05 s/ C)] †
5 s
+ 3.3 s
+ [(50 C - 25 C)(0.05 s / C)]
8.3 s + 1.25 s
9.55 s
C
) (R
Legend C
IC
VA
CALCULATING THE
MINIMUM
REQUIRED SAMPLE TIME
+ R
R
V
I
R
SS
C
SS
S
LEAKAGE
T
PIN
IC
HOLD
+ R
Port Pin
C
5 pF
PIN
S
) In (1/16384)
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance
†
various junctions
V
DD
V
Vt = 0.6V
T
= 0.6V
I
± 100 nA
LEAKAGE
R
IC
~ 1k
~
V
SS R
DD
Sampling
Switch
6V
5V
4V
3V
2V
SS
Sampling Switch (R
5 6 7 8 9 10 11
V
C
SS
HOLD
( k
2002 Microchip Technology Inc.
)
= 25 pF
SS
)