Figure 9-12. Ads1285Evm-Pdk Reference Voltage Schematic; Figure 9-13. Ads1285Evm Dac Schematic - Texas Instruments ADS1285EVM-PDK User Manual

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AVDD1
C25
1µF
J11
AVSS
1
REF62xx EN
2
R40
R41
130k
10.0k
C28
1µF
AVSS AVSS
Connects to 'DC127_Interface' page DAC1282_SPI
RESET/PWDN
SBAU394A – APRIL 2022 – REVISED SEPTEMBER 2022
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On-board references
U8
R37
1 6
VIN OUT_F
0.22
2 5
EN OUT_S
3 8
SS GND_S
4 7
FILT GND_F
REF6241IDGKR
AVSS AVSS
Reference options
REF6250 supply range: 5.3 - 5.5V
REF6241 supply range: 4.35 - 5.5V
REF6225 supply range: 3 - 5.5V

Figure 9-12. ADS1285EVM-PDK Reference Voltage Schematic

All jumpers should be installed
to provide power to the DAC
AVSS+5V
DVDD
1 2
3 4
J1
R1
100k
CLK
SCLK
DIN
R5 49.9
DOUT
CS
SW/TD
SYNC
VREFP
Connects to 'DC127_Reference' page
VREFN

Figure 9-13. ADS1285EVM DAC Schematic

Copyright © 2022 Texas Instruments Incorporated
ADS1285EVM-PDK Bill of Materials, PCB Layout, and Schematics
R38
0
R39
0.22
C26
0.01uF
C27
22µF
R42
0
C1
1uF
AVSS
C2
1uF
AVSS
R2
U1
100k
C3
13
AVDD CAPP
1uF 24
AVDD
5
DVDD
VOUTP
GND
VOUTN
7
CLK CAPN
2
SCLK SWINP
3
DIN SWINN
4
DOUT
1
CS SWOUTP
SWOUTN
8
SW/TD
9
SYNC AVSS
10
RESET/PWDN AVSS
DGND
12
VREF DGND
DAC1282IPWR
C7
Digital-to-Analog converter
0.1uF
+ -
Header for measuring reference voltage or
J10 connecting to an external reference source
NOTE: This reference voltage is shared between
the ADS1285 and DAC1282
VREFP
Connects to 'DC127_ADC' and 'DC127_DAC' pages
VREFN
Route REFP/REFN as differential
pair, and only connect REFN to
AVSS near the reference source(s).
VOUTP_SWINP
22 C4
0.01uF
VOUTP R3 VOUTP_SWINP
21 0 2
VOUTN R4 0 VOUTN_SWINN
16
C5
15
0.01uF VOUTN_SWINN
20
17
19
DAC_SWOUTP
18
DAC_SWOUTN
14
23
6
R6 R7
11
0 0
C6
1uF AVSS
AVSS
GND
ADS1285EVM-PDK Evaluation Module
DAC
+
1
-
J2
Connects to 'DC127_ADC' page
33