PIC16C717-I/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C717-I/SS

18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-Bit A/D

Microchip Technology 

PIC16C717/770/771

EXAMPLE 11-3: CALCULATING THE MINIMUM

REQUIRED SAMPLE TIME

TACQ =

TACQ =

Amplifier Settling Time

+ Holding Capacitor Charging Time

+Temperature offset †

5 µs

+ TC

+ [(Temp - 25°C)(0.05 µs/°C)] †

TC =

TC =

TC =

TC =

TC =

TC =

Holding Capacitor Charging Time

(CHOLD) (RIC + RSS + RS) In (1/16384)

-25 pF (1 kΩ +10 kΩ + 2.5 kΩ) In (1/16384)

-25 pF (13.5 kΩ) In (1/16384)

-0.338 (-9.704)µs

3.3µs

TACQ =

5 µs

+ 3.3 µs

+ [(50°C - 25°C)(0.05 µs / °C)]

TACQ =

TACQ =

8.3 µs + 1.25 µs

9.55 µs

† The temperature coefficient is only required for

temperatures > 25°C.

FIGURE 11-5: ANALOG INPUT MODEL

Rs Port Pin

VDD

VT = 0.6V

RIC ≅ 1k

Sampling

Switch

SS RSS

VA

CPIN

5 pF

VT = 0.6V

ILEAKAGE

± 100 nA

CHOLD = 25 pF

VSS

Legend CPIN

= input capacitance

VT

= threshold voltage

ILEAKAGE = leakage current at the pin due to

various junctions

RIC

SS

CHOLD

= interconnect resistance

= sampling switch

= sample/hold capacitance (from DAC)

6V

5V

VDD 4V

3V

2V

5 6 7 8 9 10 11

Sampling Switch (RSS)

( kΩ )

DS41120A-page 122

Advanced Information

© 1999 Microchip Technology Inc.

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