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1
A
J2
1
IN0
2
IN1
3
IN2
4
IN3
5
IN4
6
IN5
7
IN6
8
IN7
9
AINCOM
10
ED555/10DS
GND
TERMINAL BLOCK
Ratiometric
1
IN6
Top Side
Connection
2
IN4
Jumper
JP1
J3
1
IN0
R17 sets up a 1.95V reference
B
2
IN1
voltage with 500uA IDAC
3
IN2
4
IN3
5
IN4
6
IN5
7
IN6
8
IN7
AINCOM1
9
10
AINCOM
11
C22
47pF
12
13
GND
14
15
16
17
18
REFOUT1
19
20
REFOUT
C
DAUGHTER-ANALOG
Bottom Side
(Connects to MMB0)
GND
MMB0 passes signals through to J10
R22
IN6
Thermistor (for CJC)
NI
R23
2.2k @ 25°C
12k
R24
IN7
Configured for 250uA IDAC
NI
R25
in single supply configuration
(Install 0-Ohms in R22 & R24)
1.2k
J4
GND
2
Thermocouple
Input
1
ED555/2DS
R31
TERMINAL BLOCK
NI
Top Side
D
Cold Junction = GND
GND
GND3
Sensor Bias
Jumper
JP5
GND
1
2
IN1
IN0
R1
47
AIN0
(EXT REF1 P)
C1
X2Y Capacitor
C2
NI
47pF
R2
C3
NI
GND
GND
GND
100nF
C4
47pF
IN1
R6
47
AIN1
(EXT REF1 N)
IN2
IN2
R8
47
AIN2
(EXT REF2 P)
X2Y Capacitor
C7
C8
NI
47pF
R10
C9
NI
GND
GND
GND
100nF
C11
47pF
IN3
R12
47
AIN3
(EXT REF2 N)
IN4
R16
47
AIN4
(EXT REF3 P)
C16
X2Y Capacitor
47pF
C17
NI
R17
C18
GND
GND
GND
3.9k
100nF
C21
47pF
IN5
R18
47
AIN5
(EXT REF3 N)
2
AVSS Connection
1
Jumper
JP3
R19
620
R19 increases REF3N voltage to >0.3V when used with
500uA IDAC in single supply and ratiometric configurations
AVSS
IN6
R20
47
AIN6
(Test SIG P)
C23
X2Y Capacitor
47pF
C24
NI
C25
GND
GND
GND
100nF
C26
47pF
IN7
R21
47
AIN7
(Test SIG N)
INPUT FILTERING
CM f-3dB = 72 MHz
DM f-3dB = 16.9 kHz
X2Y Capacitor
R26
499
AIN8
C34
C35
NI
1nF
C36
GND
GND
GND
100nF
C37
1nF
R28
499
AIN9
FILTERING
CM f-3dB = 319 kHz
MMB0 Signals
DM f-3dB = 1.59 kHz
Signal
Pin #
+VA
1
-VA
2
+5VA
3
-5VA
4
1
DGND
5
2
AINCOM
AGND
6
+1.8VD
7
VD1
8
+3.3VD
9
+5VD
10
2
3
4
ANALOG
U1
AIN8
1
AIN8
AIN9
2
AIN9
AINCOM
3
AINCOM
4
CAPP
C5
4.7nF
5
CAPN
AVDD
6
AVDD
C6
1uF
7
AVSS
AVSS
REFOUT
8
REFOUT
C10
START
9
START
1uF
CS
10
CS
AVSS
SCLK
11
SCLK
DIN
12
DIN
DOUT/DRDY
13
DOUT/DRDY
DRDY
14
DRDY
ADS126xIPW
AVDD
AVSS
C19
C20
0.01uF
0.01uF
GND
GND
DIGITAL
+5V
GND
+5V
C27
1uF
GND
(-5V Supply must be supplied by user)
-5V
C32
1uF
GND
GND1
GND2
GND
GND
+5V
+3.3V
-5V
-5V Input
Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this
specification or any information contained therein. Texas Instruments and/or its licensors do not
warrant that this design will meet the specifications, will be suitable for your application or fit for
Top and Bottom Side
any particular purpose, or will operate in an implementation. Texas Instruments and/or its
(Bottom Connects to MMB0)
licensors do not warrant that the design is production worthy. You should completely validate
J5
DAUGHTER-POWER
and test your design implementation to confirm the system functionality for your application.
3
4
5
28
AIN7
AIN7
27
AIN6
AIN6
26
AIN5
AIN5
25
AIN4
AIN4
START
24
AIN3
AIN3
SCLK
23
AIN2
AIN2
22
AIN1
AIN1
21
AIN0
AIN0
CS
20
RESET/PWDN
RESET/PWDN
DVDD
19
DVDD
C12
18
1uF
DGND
DIN
C13
17
1uF
BYPASS
GND
DOUT/DRDY
16
XTAL2
15
X1
ECS-73-18-10X
XTAL1/CLKIN
DRDY
S1
1
2
C14
C15
JP2
33pF
33pF
3
1
2
CAS-120TB
GND
GND
Clock Select
GND
Switch
INT/EXT Clock
Jumper
Supply Polarity
Switch
S2
6
5
Positive Supply
Pos 2
3
1
4
3
2
5
Pos 1
Negative Supply
1
+3.3V
JP4
CAS-220TB
U2
+2.5V
1
5
IN
OUT
4
BYP
3
2
EN
GND
C28
AVDD
AVSS
DVDD
100nF
TPS79225DBVT
C29
C30
GND
10uF
10uF
U3
-2.5V
GND
GND
GND
2
5
IN
OUT
4
BYP
3
1
EN
GND
C33
100nF
TPS72325DBVT
GND
Designed
Project:
Sheet Title:
Size:
B
Assembly
File:
ADS126xEVM_RevA1_Schematic.SchDoc
Contact:
5
6
DVDD
R3
R4
R5
100k
100k
100k
J1
1
2
R7
47
3
4
5
RESET/PWDN
R9
47
6
MMB0 Signals
R11
47
7
Signal
Pin #
CNTL
1
8
GPIO0
2
9
CLKX
3
DGND
4
10
CLKR
5
R13
47
11
GPIO1
6
FSX
7
12
GPIO2
8
R14
47
13
FSR
9
DGND
10
14
DX
11
R15
47
15
GPIO3
12
DR
13
SCL
16
GPIO4
14
17
*INT
15
SCL
16
18
TOUT
17
19
DGND
18
GPIO5
19
SDA
20
SDA
20
DAUGHTER-SERIAL
Top and Bottom Side
GND
(Bottom Connects to MMB0)
AVDD
AVSS
DVDD
AVDD
AVSS
2
DVDD
4
6
Power Measurement
or EXT Supply Jumpers
AVDD
D1
C31
DDZ6V2B-7
10uF
AVSS
+3.3V
R27
NI
U4
R29
R30
1
8
A0
VCC
2.7k
2.7k
2
7
A1
WP
R32
3
6
SCL
A2
SCL
0
4
5
SDA
VSS
SDA
24AA256-I/ST
EEPROM
(Used by MMB0 only)
GND
GND
for:Public Release
Mod. Date:
12/31/2014
ADS126xEVM
EVM Schematic
Sheet: of
1
1
Schematic:
6580279
Rev:
A
Variant:[No Variations]
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© Texas Instruments 2014
6
A
B
C
D
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