PIC16C774T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C774T-I/SO

28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

Microchip Technology 

PIC16C77X

FIGURE 11-7: CALCULATING THE MINIMUM REQUIRED SAMPLE TIME

TACQ =

TACQ =

Amplifier Settling Time

+ Holding Capacitor Charging Time

+Temperature Coefficient †

5 s

+ TC

+ [(Temp - 25C)(0.05s/C)] †

TC =

TC =

TC =

TC =

TC =

TC =

+ Holding Capacitor Charging Time

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

-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

TACQ =

5s

+ 3.3 s

+ [(50C - 25C)(0.05s / C)]

TACQ =

TACQ =

8.3 s + 1.25s

9.55 s

† The temperature coefficient is only required for

temperatures > 25C.

FIGURE 11-8: 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

( k )

DS30275B-page 124

Advance Information

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