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ADS7871 Arkusz danych(PDF) 6 Page - Texas Instruments |
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ADS7871 Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 46 page ADS7871 SLAS370C − APRIL 2002 − REVISED OCTOBER 2004 www.ti.com 6 PIN ASSIGNMENTS SSOP-28 PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 LN0 LN1 LN2 LN3 LN4 LN5 LN6 LN7 RESET RISE/FALL I/O0 I/O1 I/O2 I/O3 BUFOUT/REFIN BUFIN VREF GND VDD CS DOUT DIN SCLK CCLK OSC ENABLE BUSY CONVERT GND Terminal Functions TERMINAL NO. NAME I/O DESCRIPTION 1−8 LN0−LN7 AI MUX input lines 0−7 9 RESET DI Master reset, zeros all registers 10 RISE/FALL DI Sets the active edge for SCLK. 0 sets SCLK active on falling edge. 1 sets SCLK active on rising edge. 11−14 I/O0−I/O3 DIO Digital input or output signal 15 GND − Connect to ground. (This pin is grounded internally on the ADS7871. It has a weak pulldown on the ADS7870). 16 CONVERT DI 0 to 1 transition starts a conversion cycle. 17 BUSY DO 1 indicates converter is busy 18 OSC ENABLE DI 0 sets CCLK as an input, 1 sets CCLK as an output and turns the oscillator on. 19 CCLK DIO If OSC ENABLE = 1, then the internal oscillator is output to this pin. If OSC ENABLE = 0, then this is the input pin for an external conversion clock. 20 SCLK DI Serial data input/output transfer clock. Active edge set by the RISE/FALL pin. If RISE/FALL is low, SCLK is active on the falling edge. 21 DIN DIO Serial data input. In the 3-wire mode, this pin is used for serial data input. In the 2-wire mode, serial data output appears on this pin as well as the DOUT pin. 22 DOUT DO Serial data output. This pin is driven when CS is low and is high impedance when CS is high. This pin behaves the same in both 3-wire and 2-wire modes. 23 CS DI Chip select. When CS is low, the serial interface is enabled. When CS is high, the serial interface is disabled, the DOUT pin is high impedance, and the DIN pin is an input. The CS pin only affects the operation of the serial interface. It does not directly enable/disable the operation of the signal conversion process. 24 VDD − Power supply voltage, 2.7 V to 5.5 V 25 GND − Power supply ground 26 VREF AO 2.048-/2.5-V on-chip voltage reference 27 BUFIN AI Input to reference buffer amplifier 28 BUFOUT/REFIN AIO Output from reference buffer amplifier and reference input to ADC |
Podobny numer części - ADS7871 |
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Podobny opis - ADS7871 |
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