Figure 9-10. Ads1285Evm-Pdk Clock And Interface - Texas Instruments ADS1285EVM-PDK User Manual

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DVDD
C21
0.1uF R30 Y1
100k
4 3
Vdd Output
GND
1 2
Tri-state Gnd
J8
2 ECS-2520MVLC-081.92-BN-TR
CLK DIS
1
On-board clock
Supply range: 1.71V - 3.63V
GND
SBAU394A – APRIL 2022 – REVISED SEPTEMBER 2022
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2
CLK
GND
1 4
D Q
DVDD
5 3
VCC GND
C23
0.1uF U6
SN74AUP1G80DCKT
GND GND
Clock dividers
Supply range: 0.8V - 3.6V
DRDY
SYNC
RESET
PWDN
GPIO0
MFLAG/GPIO1
ADS1285_SPI
Connects to 'DC127_ADC' page
CS
SCLK
DIN
DOUT
CLK
CLK
SCLK
DIN
DOUT
CS
DAC1282_SPI
Connects to 'DC127_DAC' page
SYNC
SW/TD
RESET/PWDN
U7
1
A0
2
A1
3
A2
4
VSS
BR24G32FVT-3AGE2
EEPROM
GND
Figure 9-10. ADS1285EVM-PDK Clock and Interface Schematic
Copyright © 2022 Texas Instruments Incorporated
ADS1285EVM-PDK Bill of Materials, PCB Layout, and Schematics
R29 49.9 DAC_4MHZ
J5
8 MHz 3 4 1
4 MHz 1 2
J7
R31
Connect jumper across to 0 GND
select ADC clock frequency.
DNI if using FPGA clock.
R35
49.9
~DRDY
SYNC
~PWDN
~RESET
GPIO0
GPIO1
~CS_ADC
SCLK
DIN
DOUT
DAC_4MHZ
~CS_DAC
SYNC_DAC
SW/TD_DAC
~RST/PWDN_DAC
ID_PWR
C24
R36
0.1uF
10.0k
8
VCC
GND
7 WP
WP
6 SCL
SCL
5 SDA
SDA
External clock
CLK Options:
1) FPGA provides CLK output
2) External oscillator drives CLK (default) J6
2
2
4
4
~RESET 6
6
~PWDN
8
8
SYNC 10
10
DIN_PHI
12
12
GPIO1 14
14
GPIO0
16
16
DIN R32 49.9 DIN_PHI 18
18
20
20
~CS_ADC 22
22
SCLK R33 SCLK_PHI
49.9 24
24
R34 49.9 CAPCLK_OUT 26
26
CAPCLK_IN
28
28
~DRDY 30
30
Input to PHI >>
32
32
<< Output to ADC ADC_CLK 34
34
36
36
DOUT 38
38
40
40
42
42
44
44
DVDD ~RST/PWDN_DAC 46
46
DVDD SYNC_DAC
48
48
Configurable: 1.8V or 3.3V 50
50
SW/TD_DAC
52
52
~CS_DAC 54
54
SDA
56
56
SCL 58
58
60
60
MP1
GND
MP2
GND
GND
PHI Connector
(to FPGA motherboard)
J9
~RESET
1
~PWDN 3
SYNC
5
GPIO1 7
GPIO0
9
DIN_PHI 11
~CS_ADC
13
SCLK_PHI 15
~DRDY
17
ADC_CLK 19
DOUT
21
~RST/PWDN_DAC 23
SYNC_DAC 25
SW/TD_DAC 27
~CS_DAC 29
Connector for logic analyzer
or external controller
ADS1285EVM-PDK Evaluation Module
5.5V
5.5V
1
1
C22
3
3
5 1uF
5
7
7
9
9
GND
11
11
13
13
15
15
17
17
19
19
21
21
23
23
25
25
27
27
29
29
31
31
33
33
35
35
37
37
39
39
41
41
43
43
45
45
47
47
49 WP
49
51
51
53
53
ID_PWR
55
55
57
57
59
59
MP3
GND
MP4
GND
GND
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
GND
31