RESET
CLK Input
RESET
DOUT
DIN
SCLK
SYNC
MFLAG
DGND
CLK
24
4
5
4, 12, 23
2
10
11
1
SYNC
MFLAG1
DRDY
MFLAG2
DVDD
47
W
47
W
47
W
47
W
47
W
47
W
47
W
1 F
m
+3.3V
(1)
ADS1282
RESET
DOUT
DIN
SCLK
SYNC
MFLAG
DGND
CLK
24
4
5
6, 12, 25
2
10
11
1
DVDD
47
W
DRDY
3
47
W
47
W
1 F
m
+3.3V
(1)
ADS1282
4.096MHz Clock
FPGA
26
28
BYPAS
1 F
m
28
BYPAS
1 F
m
DOUT1
DIN1
SCLK1
47
W
DOUT2
DIN2
SCLK2
26
SBAS418I – SEPTEMBER 2007 – REVISED MARCH 2015
shows the digital connection to a field
For best performance, the FPGA and the ADS1282s
programmable gate array (FPGA) device. In this
should operate from the same clock. Avoid ringing on
example, two ADS1282s are shown connected. The
the digital inputs. 47
Ω
resistors in series with the
DRDY output from each ADS1282 can be used;
digital traces can help to reduce ringing by controlling
however, when the devices are synchronized, the
impedances. Place the resistors at the source (driver)
DRDY output from only one device is sufficient. A
end of the trace. Unused digital inputs should not
shared SCLK line between the devices is optional.
float; tie them to DVDD or GND. This includes the
modulator data pins, M0, M1, and MCLK.
The modulator over-range flag (MFLAG) from each
device ties to the FPGA. For synchronization, one
SYNC control line connects all ADS1282 devices.
The RESET line also connects to all ADS1282
devices.
NOTE: Dashed line is optional.
(1) For DVDD < 2.25V, see the
section.
Figure 66. Microcontroller Interface with Dual ADS1282s
42
Copyright © 2007–2015, Texas Instruments Incorporated
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