Texas Instruments ADS1235EVM, Руководство пользователя

Страница: 24 / 34

ADC_START
ADC_nPWDN
ADC_nRESET
ADC_SCLK
ADC_MOSI
ADC_MISO
ADC_nDRDY
ADC_nCS
FAULT_LED
EXT_CLK
ADS1261_DIGITAL
ADS1261_DIGITAL
GND
GND
47 R46
47 R44
47 R41
47 R40
47 R43
47 R45
47 R39
47 R42
External Clock Input
GND
2
1
5
3
4
6
S1
-2.5V +2.5V
+5V
GND
Analog Supply
A) Unipolar (Shown)
B) Bipolar
GND
AVDD
AVSS
4700pF
C28
10uF
C29
C1+
10
VIN
3
OUT-
6
FB-
7
EN+
12
CPOUT
5
C1-
9
GND
4
PAD
13
EN-
8
OUT+
11
FB+
2
PGOOD
1
LM27762DSSR
U5
1uF
C33
GND
GND
GND
2.2uF
C36
2.2uF
C35
+2.5V
-2.5V
4.7uF
C32
4.7uF
C34
Bipolar Supply Source (OPTIONAL)
A0
A1
A6
A7
A8
A9
A10
A2
A3
A4
A5
REFOUT (ADS1261 Only)
(ADS1261 Only)
(ADS1261 Only)
(ADS1261 Only)
GND
GND GND
0.1uF
C27
100k
R36
100k
R35
100k
R37
100k
R34
The orange LED will light up to indicate
when a STATUS byte error flag is set
OR if a CRC mismatch occurred in the
SPI communication.
0.1uF
C24
0.1uF
C25
0.1uF
C22
AVSS
AVSS
AVSS
DVDD
AVDD
DVDD
A+ DNP
A- DNP D+ DNP
D- DNP
0.1
R33
0.1
R38
511k
R55
536k
R56
604k
R53
47 R47
Pull-down enables internal
oscillator when no external
clock source is provided
DVDD +3.3V
0
R49
0
R52
0
R51
DNP
+3.3V +5V
ADC
FAULT LED
DNP
DNP
DNP
DNP
100k
R48
DNP DNP
DNP
GND
AINCOM
1
CAPP
2
CAPN
3
AVDD
4
AVSS
5
REFOUT
6
PWDN
7
RESET
8
START
9
CS
10
SCLK
11
DIN
12
DRDY
13
DOUT/DRDY
14
BYPASS
15
DGND
16
DVDD
17
CLKIN
18
NC
19
NC
20
NC
21
NC
22
AIN9
23
AIN8
24
AIN7
25
AIN6
26
AIN5
27
AIN4
28
AIN3
29
AIN2
30
AIN1
31
AIN0
32
PAD
33
ADS1261IRHBR
U3
Depopulate 0-Ohm
resistor before applying
external supply to DVDD
NC
1
A
2
GND
3
Y
4
VCC
5
SN74LVC1G06DCKT
U4
+3.3V
0.1uF
C31
GND
+5V
1.69k
R50
Orange
D1
FAULT?
549k
R54
1uF
C26
1uF
C30
1uF
C23
EVM Bill of Materials, PCB Layouts, and Schematics
www.ti.com
24
SBAU293 – March 2018
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
ADS1261 and ADS1235 Evaluation Module
ADVANCE INFORMATION
Figure 15. ADS1261EVM ADC Main Schematic