Digilent 410-087P-KIT - Manual (Page 73)

Spartan-3E Starter Kit Board User Guide www.xilinx.com 73
UG230 (v1.0) March 9, 2006
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Chapter 10
Analog Capture Circuit
The Spartan-3E 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
Figure 10-1 . Analog inputs are supplied on the J7 header.
The analog capture circuit consists of a Linear Technology LTC6912-1 programmable pre-
amplifier that scales the incoming analog signal on header J7 (see
Figure 10-2 ). The output
of 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.
Figure 10-1: Two-Channel Analog Capture Circuit
6-pin ADC Header (J7)
Linear Tech LTC1407A-1 Dual A/D
SPI_SCK: (U16)
AD_CONV: (P11)
SPI_MISO: (N10)
Linear Tech LTC6912-1 Dual Amp
SPI_MOSI: (T4)
AMP_CS: (N7)
SPI_SCK: (U16)
AMP_SHDN: (P7)
AMP_DOUT: (E18)
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