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ADS1120IRVAT Datasheet(PDF) 8 Page - Texas Instruments |
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ADS1120IRVAT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 71 page  Hi-Z Hi-Z CS SCLK DOUT/DRDY tp(CSDO) tp(SCDO) tp(CSDOZ) CS SCLK DIN ttd(CSSC)t ttc(SC)t ttd(SCCS)t tw(CSH) tw(SCH) tw(SCL) tsu(DI) th(DI) ADS1120 SBAS535B – AUGUST 2013 – REVISED JANUARY 2015 www.ti.com 6.6 SPI Timing Requirements over operating ambient temperature range and DVDD = 2.3 V to 5.5 V (unless otherwise noted) MIN MAX UNIT td(CSSC) Delay time, CS falling edge to first SCLK rising edge(1) 50 ns td(SCCS) Delay time, final SCLK falling edge to CS rising edge 25 ns tw(CSH) Pulse duration, CS high 50 ns tc(SC) SCLK period 150 ns tw(SCH) Pulse duration, SCLK high 60 ns tw(SCL) Pulse duration, SCLK low 60 ns tsu(DI) Setup time, DIN valid before SCLK falling edge 50 ns th(DI) Hold time, DIN valid after SCLK falling edge 25 ns Normal mode, duty-cycle mode 13955 t(MOD) SPI timeout(2) Turbo mode 27910 t(MOD) (1) CS can be tied low permanently in case the serial bus is not shared with any other device. (2) See the SPI Timeout section for more information. t(MOD) = 1 / f(MOD). Modulator frequency f(MOD) = 256 kHz (normal mode, duty-cycle mode) and 512 kHz (turbo mode), when using the internal oscillator or an external 4.096-MHz clock. NOTE: Single-byte communication is shown. Actual communication may be multiple bytes. Figure 1. Serial Interface Timing Requirements 6.7 SPI Switching Characteristics over operating ambient temperature range, DVDD = 2.3 V to 5.5 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Propagation delay time, tp(CSDO) DOUT load = 20 pF || 10 k Ω to DGND 50 ns CS falling edge to DOUT driven Propagation delay time, tp(SCDO) DOUT load = 20 pF || 10 k Ω to DGND 0 50 ns SCLK rising edge to valid new DOUT Propagation delay time, tp(CSDOZ) DOUT load = 20 pF || 10 k Ω to DGND 50 ns CS rising edge to DOUT high impedance NOTE: Single-byte communication is shown. Actual communication may be multiple bytes. Figure 2. Serial Interface Switching Characteristics 8 Submit Documentation Feedback Copyright © 2013–2015, Texas Instruments Incorporated Product Folder Links: ADS1120 |
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