ADS8472I BURR-BROWN [Burr-Brown Corporation], ADS8472I Datasheet - Page 19

• Manufacturer Part Number: ADS8472I
• Description: 16-BIT, 1-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

ADS8472 TO A HIGH PERFORMANCE DSP INTERFACE
Figure 37
such as the TMS320C6713 using the full 16-bit bus. The ADS8472 is mapped onto the CE2 memory space of
the TMS320C6713 DSP. The read and reset signals are generated by using a 3-to-8 decoder. A read operation
from the address 0xA000C000 generates a pulse on the RD pin of the data converter, wheras a read operation
form word address 0xA0014000 generates a pulse on the RESET/PD1 pin. The CE2 signal of the DSP acts as
CS (chip select) for the converter. As the TMS320C6713 features a 32-bit external memory interface, the BYTE
input of the converter can be tied permanently low, disabling the foldback of the data bus. The BUSY signal of
the ADS8472 is appiled to the EXT_INT6 interrupt input of the DSP, enabling the EDMA controller to react on
the falling edge of this signal and to collect the conversion result. The TOUT1 (timer out 1) pin of the
TMS320C6713 is used to source the CONVST signal of the converter.
www.ti.com
shows a parallel interface between the ADS8472 and a Texas instruments high performance DSP
TMS320C6713
DSP
EXT_INT6
EA[16:14]
ED[15:0]
TOUT1
ARE
CE2
Figure 38. ADS8472 Using Internal Reference
Analog 5 V
Figure 37. ADS8472 Application Circuitry
APPLICATION INFORMATION
0.1 F
10 F
Address
Decoder
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0.1 F
ADS8472
AGND
1 F
CS
RD
CONVST
BUSY
DB[15:0]
+VA = 5 V
ADS8472
10 F
0.1 F
m
m
1 F
m
BDGND
AGND
BYTE
+VBD
AGND
I/O Digital Ground
BDGND
SLAS514 – DECEMBER 2006
+VBD +2.7 V
I/O Supply
0.1 F
m
ADS8472
Ext Ref
Input
Analog
Input
19