AC164112 Microchip Technology, AC164112 Datasheet - Page 106
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AC164112
Manufacturer Part Number
AC164112
Description
VOLTAGE LIMITER MPLAB ICD2 VPP
Manufacturer
Microchip Technology
Datasheet
1.AC164112.pdf
(302 pages)
Specifications of AC164112
Accessory Type
Voltage Limiter
Product
Cable Assemblies
Features
Programming And Debugging The Latest PIC12/PIC16/PIC18 Products
Development Tool Type
Hardware - Eval/Demo Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
MPLAB®
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
MPLAB ICD 2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
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Manufacturer
Quantity
Price
Company:
Part Number:
AC164112
Manufacturer:
Microchip Technology
Quantity:
135
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PIC16F72X/PIC16LF72X
9.3
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 9-3. The source imped-
ance (R
impedance directly affect the time required to charge
the capacitor C
impedance varies over the device voltage (V
to Figure 9-3. The maximum recommended imped-
ance for analog sources is 10 kΩ. As the source
EQUATION 9-1:
DS41341E-page 106
The value for T
Solving for T
Therefore:
Note 1: The reference voltage (V
Assumptions:
V
V
V
Note: Where n = number of bits of the ADC.
S
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 10 kΩ. This is required to meet the pin
A/D Acquisition Requirements
) and the internal sampling switch (R
AP P LI ED
AP P LI ED
AP P LI ED
T
leakage specification.
ACQ
T
C
ACQ
T
:
HOLD
C
C
⎛
⎝
⎛
⎜
⎝
⎛
⎜
⎝
=
Temperature
can be approximated with the following equations:
=
=
=
=
1
1 e
1 e
HOLD
=
=
=
. The sampling switch (R
2
ACQUISITION TIME EXAMPLE
4.42
–
–
–
1.12
–
–
ΜS
Amplifier Settling Time
T
2µs
C
10pF 1k
--------------------------
(
AMP
) must be allowed to fully
2
–
--------- -
–
-------- -
HOLD
RC
+
RC
ΜS
µs
T
Tc
n
+
C
1.12
+
⎞
⎟
⎠
⎞
⎟
⎠
(
+
1
T
1
(
C
) 1
=
R
=
T
ΜS
Ω
+
IC
C
–
=
V
V
+
+
[
+
REF
+
(
A PP LIE D
⎞
⎠
CHOLD
7k
50°C and external impedance of 10k
Temperature - 25°C
T
[
R
(
) has no effect on the equation, since it cancels itself out.
COFF
Ω
50°C- 25°C
=
SS
+
+
HOLD
DD
V
10k
CHOLD
R
), refer
⎛
⎝
S
1
+
) ln(1/511)
) is not discharged after each conversion.
Ω
SS
SS
–
Hold Capacitor Charging Time
)
)
)
) 0.05
--------------------------
(
ln(0.001957)
(
2
n
+
) 0.05µs/°C
1
ΜS
1
(
) 1
/°C
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 can be started. To calculate the mini-
mum acquisition time, Equation 9-1 may be used. This
equation assumes that 1/2 LSb error is used (256 steps
for the ADC). The 1/2 LSb error is the maximum error
allowed for the ADC to meet its specified resolution.
–
)
⎞
⎠
]
;[1] V
;[2] V
;combining [1] and [2]
)
]
Ω
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
DD
Temperature Coefficient
© 2009 Microchip Technology Inc.
APPLIED
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