ADS8284
www.ti.com................................................................................................................................................................................................... SLAS628–MARCH 2009
From BUF-REF o/p of ADC
(Use external buffer if current drawn by
resistor network exceeds current output
specification of reference buffer)
R
R
R
R
CHnP
CHnM
C
C
±±2 Rꢀf ꢁruꢀ Bipolar,
Diff Signals
Note: Value of R depends on signal BW Use R = 1.2 kW for signal BW <= 10 kHz.
Choose C as per signal BW, 3 dB BW (filt) = RC/2
Figure 71. Conversion of Bipolar Input Signals to Unipolar Differential Signals
MICROCONTROLLER INTERFACING
ADS8284 to 8-Bit Microcontroller Interface
Figure 72 shows a parallel interface between the ADS8284 and a typical microcontroller using an 8-bit data bus.
The BUSY signal is used as a falling edge interrupt to the microcontroller.
Analog 5 V
0.1 µF
AGND
10 µF
Ext Ref Input
0.1 µF
Analog Input
Micro
Controller
Digital 3 V
GPIO
CS
AD8284
0.1 µF
GPIO
GPIO
GPIO
RD
BYTE
BDGND
+VBD
BUS18/16
CONVST
RD
BDGND
AD[7:0]
DB[17:10]
Data Bus D[17:0]
Figure 72. ADS8284 Application Circuitry
Copyright © 2009, Texas Instruments Incorporated
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