PIC16F688-I/P Microchip Technology Inc., PIC16F688-I/P Datasheet - Page 75

• Manufacturer Part Number: PIC16F688-I/P
• Description: 14 PIN, 7 KB FLASH, 256 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F688-I/P

• A/d Inputs: 8-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 12
• Interface: USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 14-pin PDIP
• Programmable Memory: 7K Bytes
• Ram Size: 256 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

8.3
For the ADC to meet its specified accuracy, the charge
holding capacitor (C
charge to the input channel voltage level. The Analog
Input model is shown in Figure 8-4. The source
impedance (R
impedance directly affect the time required to charge the
capacitor C
varies over the device voltage (V
The maximum recommended impedance for analog
sources is 10 k . As the source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
an A/D acquisition must be done before the conversion
EQUATION 8-1:
© 2006 Microchip Technology Inc.
Note 1: The reference voltage (V
Assumptions:
The value for T
Solving for T
Therefore:
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 10 k . This is required to meet the pin
A/D Acquisition Requirements
HOLD
leakage specification.
T
V
S
V
V
ACQ
T
) and the internal sampling switch (R
AP PLIE D
T
. The sampling switch (R
ACQ
AP P LI ED
AP P LIED
C
C
=
=
=
=
=
:
HOLD
C
=
=
=
ACQUISITION TIME EXAMPLE
–
Temperature
–
2µ
4.67µ
can be approximated with the following equations:
1.37
C
10pF 1k
⎛
⎝
Amplifier Settling Time
T
2µs
⎛
⎜
⎝
⎛
⎜
⎝
S
1
) must be allowed to fully
AMP
HOLD
1 e
1 e
+
µs
–
S
–
+
–
1.37µ
----------- -
2047
+
T
R
1
–
--------- -
C
–
-------- -
RC
RC
T
T
DD
Tc
IC
+
C
C
S
+
⎞
⎠
⎞
⎟
⎠
⎞
⎟
⎠
), see Figure 8-4.
+
+
+
REF
7k
=
Temperature - 25°C 0.05µs/°C
T
=
=
=
R
SS
) has no effect on the equation, since it cancels itself out.
COFF
SS
50°C- 25°C 0.05µ
) impedance
50°C and external impedance of 10k
V
V
V
+
+
CHOLD
A P PLIE D
HOLD
CHOLD
10k
R
S
+
) is not discharged after each conversion.
ln(1/2047)
SS
Hold Capacitor Charging Time
ln(0.0004885)
)
⎛
⎝
1
–
----------- -
2047
S
1
/°C
can be started. To calculate the minimum acquisition
time, Equation 8-1 may be used. This equation
assumes that 1/2 LSb error is used (1024 steps for the
ADC). The 1/2 LSb error is the maximum error allowed
for the ADC to meet its specified resolution.
⎞
⎠
;[2] V
;combining [1] and [2]
;[1] V
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
Temperature Coefficient
DD
PIC16F688
DS41203C-page 73
APPLIED