Chapter 9: Analog Capture Circuit - Xilinx Spartan-3A User Manual

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Analog Capture Circuit
The Spartan-3A/3AN Starter Kit board includes a two-channel analog capture circuit,
consisting of a programmable scaling pre-amplifier and an analog-to-digital converter
(ADC), as shown in
The analog capture circuit consists of a Linear Technology LTC6912-1 programmable pre-
amplifier that scales the incoming analog signal on the J22 header. The output of the pre-
amplifier connects to a Linear Technology LTC1407A-1 ADC. Both the pre-amplifier and
the ADC are serially programmed or controlled by the FPGA.
Spartan-3A/3AN Starter Kit Board User Guide
UG334 (v1.0) May 28, 2007
Figure 9-1.
6-pin ADC Header (J22)
Figure 9-1: Analog Capture Circuit and Associated Stake Pin Header (J22)
www.xilinx.com
Linear Tech LTC1407A-1 Dual A/D
SPI_SCK: (AA20)
AD_CONV: (Y6)
AD_DOUT: (D16)
Linear Tech LTC6912-1 Dual Amp
SPI_MOSI: (AB14)
AMP_CS: (W6)
SPI_SCK: (AA20)
AMP_SHDN: (W15)
AMP_DOUT: (T7)
Chapter 9
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