DSPIC30F4013 Microchip Technology Inc., DSPIC30F4013 Datasheet - Page 131

• Manufacturer Part Number: DSPIC30F4013
• Description: Dspic30f3014/4013 High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

The following figure depicts the recommended circuit
for the conversion rates above 200 ksps. The
dsPIC30F3014 is shown as an example.
FIGURE 19-2:
The configuration procedures below give the required
setup values for the conversion speeds above 100
ksps.
19.7.1
The following configuration items are required to
achieve a 200 ksps conversion rate.
• Comply with conditions provided in Table 19-2.
• Connect external V
• Set SSRC<2.0> = 111 in the ADCON1 register to
• Enable automatic sampling by setting the ASAM
• Write the SMPI<3.0> control bits in the ADCON2
© 2007 Microchip Technology Inc.
the recommended circuit shown in Figure 19-2.
enable the auto-convert option.
control bit in the ADCON1 register.
register for the desired number of conversions
between interrupts.
C2
0.1 μF
Note 1: Ensure adequate bypass capacitors are provided on each V
R2
10
V
DD
200 KSPS CONFIGURATION
GUIDELINE
V
DD
C1
0.01 μF
REF
ADC VOLTAGE REFERENCE SCHEMATIC
+ and V
1
2
3
4
5
6
7
8
9
10
11
REF
V
V
V
SS
DD
DD
- pins following
V
dsPIC30F3014
DD
R1
10
• Configure the ADC clock period to be:
• Configure the sampling time to be 1 T
The following figure shows the timing diagram of the
ADC running at 200 ksps. The T
tion with the guidelines described above allows a con-
version speed of 200 ksps. See Example 19-1 for code
example.
V
V
V
V
by writing to the ADCS<5:0> control bits in the
ADCON3 register.
writing: SAMC<4:0> = 00001.
SS
SS
DD
DD
DD
dsPIC30F3014/4013
33
32
31
30
29
28
27
26
25
24
23
pin.
(14 + 1) x 200,000
1
V
DD
See Note 1:
C8
1 μF
C5
1 μF
V
AV
= 334 ns
DD
AD
DD
C7
0.1 μF
C4
0.1 μF
selection in conjunc-
DS70138E-page 129
V
AV
DD
AD
DD
C6
0.01 μF
C3
0.01 μF
by
V
AV
DD
DD