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3.4 Analog Inputs –Channels A0, B0, and C1/C0
4 Digital Interface
4.1 Parallel Control
Digital Interface
Figure 2. Channel B1 Input Circuit
The analog inputs to the remaining ADS7864 input channels are routed to connector J3 and configured
with simple R/C filters only. This configuration allows the EVM user to apply any customized input circuit to
the data converter. Connector J3 is comprised of a male/female pass-through combination of pin header
and socket with industry standard 0.1-inch centers.
When the ADS7864MEVM is used in combination with the 5-6K Interface Board or HPA-MCU Interface
board, the DAP Signal Conditioning Board (SLAU105 ) can be used to drive the remaining input channels.
The ADS7864MEVM is designed for easy interfacing to multiple control platforms. Jumper options are
provided on the EVM to allow control over the state of Chip Select pin ( CS) as well as the operating mode
pins (A0–A2) the Reset pin ( RST) and the Conversion Start strobes (HOLDA, HOLDB, and HOLDC).
Jumpers W4 and W6 control the signals applied to A0, A1, A2 and CS. In the factory default mode, W6 is
closed by means of a shunt jumper. The Ax and CS pins are controlled by the signals applied to J5 (top or
bottom side). When used with either the 5-6K or HPA-MCU Interface Boards, these control signals are
associated with the host processors address bus.
By removing the shunt jumper located at W6, the A0, A1, and A2 pins are controlled by shunt jumpers
placed on W4. The CS pin is routed to J5.1, which requires the application of an active-low Chip Select
signal. A simple shunt jumper placed across J5 pins 1-2 can be used to force the CS pin to ground if
desired.
Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin
dual-row header/socket combination at J5 (Table 2 ). This header/socket provides access to the digital
control pins of the EVM. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for a variety of mating
connector options.
ADS7864MEVM 4 SLAU188 – September 2006
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