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Power Supplies
Table 2. J5: Serial Interface Pins (continued)
Pin No. Pin Name Signal Name I/O Type Pullup Function
J5.17 TOUT CLK In None Can be used to provide
a clock from a
processor
J5.18 DGND DGND In/Out None Digital ground
J5.19 GPIO5 EXTCLK In None External clock input
J5.20 SDA SDA I
2
C n/a I
2
C data
Many pins on J5 have weak pull-up/-down resistors. These resistors provide default settings for many of
the control pins. Many pins on J5 correspond directly to ADS1282 pins. See the
ADS1282 product data
sheet for complete details on these pins.
4 Power Supplies
J8 is the power-supply input connector. Table 3 lists the configuration details for J8. Analog inputs to the
ADC can be applied directly to the device (see Section 8.1 , Analog Input). An additional bipolar supply is
needed to power the bipolar amplifiers. For optimum noise performance, the external supplies (+VA and
– VA) should be used.
Table 3. J3 Configuration: Power-Supply Input
Pin No. Pin Name Function Required
J8.1 +VA +10V to +15V Yes
J8.2 – VA – 10V to – 15V Yes
J8.3 +5VA +5V analog supply Always
J8.4 – 5VA – 5V analog supply No; only for bipolar
mode
J8.5 DGND Digital ground input Yes
J8.6 AGND Analog ground input Yes
J8.7 +1.8VD 1.8V digital supply No
J8.8 VD1 Not used No
J8.9 +3.3VD 3.3V digital supply Always
J8.10 +5VD +5V No
4.1 Bipolar Power Options
The voltage used to power the operational amplifiers is +10V and – 10V pins J8.1 and J8.2. If using bipolar
mode ± 5V supplies must be connected to pins J8.3 and J8.4. The ± 5V is regulated down to ± 2.5V with
U10 and U13 in bipolar mode. Jumpers must be properly placed across J7.1 and J7.2 as well as J7.3 and
J7.4 to properly power the ADS1282 (shown in
Figure 1 ).
Figure 1. Connectors for J7
5 SBAU144C – March 2009 – Revised May 2011 ADS1282EVM and ADS1282EVM-PDK User ' s Guide
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