Texas Instruments TMS320F2837 D Series - Page 118

Analog-to-Digital Converter (ADC)
6 - 4 TMS320F2837xD Microcontroller Workshop - Analog Subsystem
Analog-to-Digital Converter (ADC)
ADC Subsystem
ADC-
A
16/
12-
bit
16
channel
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
ADC-
B
16
/
12
-
bit
16 channel
ADC
-
C
16/
12-
bit
16
channel
ADC
-D
16
/12
-bit
16
channel
DACOUTA
/
ADCINA
0
DACOUTB/
ADCINA
1
CMPIN1
P/
ADCINA
2
CMPIN
1N
/
ADCINA3
CMPIN
4
N/
ADCIN15
Reserved
TEMP SENSOR
VDAC
/ADCINB
0
DACOUTC/
ADCINB1
CMPIN
3P
/ADCINB
2
CMPIN
3N
/
ADCINB3
CMPIN
5P
/ADCINC
4
CMPIN
5N
/
ADCINC5
CMPIN6
P/
ADCINC
2
CMPIN6
N
/
ADCINC
3
CMPIN7
P
/ADCIND
0
CMPIN
7
N/
ADCIND1
CMPIN
8P
/ADCIND
2
CMPIN
8N
/
ADCIND3
Reserved
CMPIN
2
P/
ADCINA4
CMPIN
2N
/ADCINA
5
ADCINB4
ADCINB5
ADCIND
4
ADCIND5
DACOUTA
DACOUTA
DACOUTA
DACOUTA
VREFD
VREFC
VREFB
VREFA
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
VREFLOD
VREFLOD
Reserved
Reserved
VREFLOC
VREFLOC
Reserved
Reserved
VREFLOA
VREFLOA
Reserved
Reserved
VREFLOB
VREFLOB
Reserved
Reserved
CMPIN
4P
/
ADCIN14
Reserved
Reserved
Reserved
Reserved
Reserved
*** Multiple ADC modules allow simultaneous sampling or independent operation ***
The F2837xD includes four independent high-performance ADC modules which can be accessed
by both CPU subsystems, allowing the device to efficiently manage multiple analog signals for
enhanced overall system throughput. Each ADC module has a single sample-and-hold (S/H)
circuit and using multiple ADC modules enables simultaneous sampling or independent operation
(sequential sampling). The ADC module is implemented using a successive approximation
(SAR) type ADC with a configurable resolution of either 16-bits or 12-bits. For 16-bit resolution,
the ADC performs differential signal conversions with a performance of 1.1 MSPS, yielding 4.4
MSPS for the device. In differential signal mode, a pair of pins (positive input ADCINxP and
negative input ADCINxN) is sampled and the input applied to the converter is the difference
between the two pins (ADCINxP – ADCINxN). A benefit of differential signaling mode is the
ability to cancel noise that may be introduced common to both inputs. For 12-bit resolution, the
ADC performs single-ended signal conversions with a performance of 3.5 MSPS, yielding 14
MSPS for the device. In single-ended mode, a single pin (ADCINx) is sampled and applied to the
input of the converter.