Texas Instruments ADS1285EVM-PDK, User Manual, Page: 33 / 40

1µF
C28
1µF
C25
AVSS
AVSS
AVSS
NOTE: This reference voltage is shared between
the ADS1285 and DAC1282
On-board references
Route REFP/REFN as differential
pair, and only connect REFN to
AVSS near the reference source(s).
AVSS
VREFP
VREFN
Header for measuring reference voltage or
connecting to an external reference source
AVSS
+ -
10.0k
R41
1
2
J11
Connects to 'DC127_ADC' and 'DC127_DAC' pages
REF6250 supply range: 5.3 - 5.5V
REF6241 supply range: 4.35 - 5.5V
REF6225 supply range: 3 - 5.5V
0.22
R39
0.01uF
C26
0.22
R37
VIN
1
EN
2
SS
3
FILT
4
OUT_S
5
OUT_F
6
GND_F
7
GND_S
8
REF6241IDGKR
U8
REF62xx EN
AVDD1
Reference options
22µF
C27
0
R38
0
R42
130k
R40
1
2
J10
Figure 9-12. ADS1285EVM-PDK Reference Voltage Schematic
GND
GND
AVSS
CLK
SYNC
SCLK
DIN
DOUT
CS
SW/TD
RESET/PWDN
DAC1282_SPI Connects to 'DC127_Interface' page
Connects to 'DC127_Reference' page
VREFP
Digital-to-Analog converter
DAC_SWOUTP
DAC_SWOUTN
Connects to 'DC127_ADC' page
+
-
DVDD
AVSS
AVSS
VOUTP
VOUTN VOUTP_SWINP
VOUTN_SWINN
1 2
3 4
J1
VREFN
0
R7
AVSS
0
R6
AVSS+5V
All jumpers should be installed
to provide power to the DAC
0.01uF
C4
0.01uF
C5
1uF
C1
1uF
C2
1uF
C3
1uF
C6
1
2
J2
DAC
100k
R1
100k
R2
49.9
R5
0.1uF
C7
CS
1
SCLK
2
DIN
3
DOUT
4
DVDD
5
DGND
6
CLK
7
SW/TD
8
SYNC
9
RESET/PWDN
10
DGND
11
VREF
12
AVDD
13
AVSS
14
CAPN
15
VOUTN
16
SWINN
17
SWOUTN
18
SWOUTP
19
SWINP
20
VOUTP
21
CAPP
22
AVSS
23
AVDD
24
DAC1282IPWR
U1
VOUTP_SWINP
VOUTN_SWINN
0 R3
0 R4
Figure 9-13. ADS1285EVM DAC Schematic
www.ti.com ADS1285EVM-PDK Bill of Materials, PCB Layout, and Schematics
SBAU394A – APRIL 2022 – REVISED SEPTEMBER 2022
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ADS1285EVM-PDK Evaluation Module 33
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