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PIC16F870/P Datasheet(PDF) 83 Page - Microchip Technology

Part # PIC16F870/P
Description  28/40-Pin 8-Bit CMOS FLASH Microcontrollers
PDF  156 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F870/P Datasheet(HTML) 83 Page - Microchip Technology

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© 1999 Microchip Technology Inc.
Preliminary
DS30569A-page 83
PIC16F870/871
EQUATION 10-1:
ACQUISITION TIME
FIGURE 10-2: ANALOG INPUT MODEL
TACQ
TC
TACQ
=
=
=
=
=
=
=
=
Amplifier Settling Time +
Hold Capacitor Charging Time +
Temperature Coefficient
TAMP + TC + TCOFF
2
µS + TC + [(Temperature -25°C)(0.05µS/°C)]
CHOLD (RIC + RSS + RS) In(1/2047)
- 120pF (1k
Ω + 7kΩ + 10kΩ) In(0.0004885)
16.47
µS
2
µS + 16.47µS + [(50°C -25×C)(0.05µS/×C)
19.72
µS
Note 1: The reference voltage (VREF) has no effect on the equation, since it cancels itself out.
2: The charge holding capacitor (CHOLD) is not discharged after each conversion.
3: The maximum recommended impedance for analog sources is 10 k
Ω. This is required to meet the pin leak-
age specification.
4: After a conversion has completed, a 2.0TAD delay must complete before acquisition can begin again.
During this time, the holding capacitor is not connected to the selected A/D input channel.
CPIN
VA
RS
ANx
5 pF
VDD
VT = 0.6V
VT = 0.6V
I LEAKAGE
RIC
≤ 1k
Sampling
Switch
SS RSS
CHOLD
= DAC capacitance
VSS
6V
Sampling Switch
5V
4V
3V
2V
5 6 7 8 9 10 11
( k
Ω )
VDD
= 120 pF
± 500 nA
Legend
CPIN
VT
I LEAKAGE
RIC
SS
CHOLD
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
various junctions



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