Datasheet

13
®
ADS7816
The ADS7816s and the DSP56004 can all be placed into a
power down mode. Or, the DSP56004 can run the ADS7816s
at a full 3.2MHz clock rate while on-board software enables
the ADS7816s as needed. With additional glue logic, the
DSP56004 could be used to run multiple DAC56s or provide
CS controls for each of the three ADS7816s.
FIGURE 7. Flexible Data Acquisition System.
Figure 8 shows a basic data acquisition system. The ADS7816
input range is 0V to 5V, as the reference input is connected
directly to the +5V supply. The 5 to 10 resistor and 1µF
to 10µF capacitor filter the microcontroller “noise” on the
supply, as well as any high-frequency noise from the supply
itself. The exact values should be picked such that the filter
provides adequate rejection of the noise.
FIGURE 8. Basic Data Acquisition System.
ADS7816
V
CC
CS
D
OUT
DCLOCK
V
REF
+In
–In
GND
+
+
5 to 10
1µF to
10µF
1µF to
10µF
0.1µF
Microcontroller
+5V
ADS7816
DSP56004
WST
SDO0
SDO1
SDO2
SCKT
SCKR
SDI0
SDI1
WSR
SCK/SCL
MISO/SDA
MOSI/HA0
HREQ
SS/HA2
CS
D
OUT
DCLOCK
V
REF
+In
–In
Serial Audio
Interface
Serial Host
Interface
ADS7816
CS
D
OUT
DCLOCK
V
REF
+In
–In
ADS7816
DAC56
CS
D
OUT
DCLOCK
V
REF
+In
–In
LE
CLK
DATA
V
OUT
+
10µF
0.1µF
+
10µF
0.1µF
+
10µF
0.1µF
10 10
10