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ADS7888SDBVR Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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ADS7888SDBVR Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 23 page www.ti.com TIMING REQUIREMENTS (see Figure 1) ADS7887 ADS7888 SLAS468 – JUNE 2005 ADS7888 SPECIFICATIONS (continued) +V DD = 2.35 V to 5.25 V, TA = –40°C to 125°C, fsample = 1.25 MHz PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VDD = 5 V 5.5 7.5 Power dissipation in static state mW VDD = 3 V 3 4.5 Power down time 0.1 µs Power up time 0.8 µs Invalid conversions after power up 1 TEMPERATURE RANGE Specified performance –40 125 °C All specifications typical at T A = –40°C to 125°C, VDD = 2.35 V to 5.25 V, unless otherwise specified. PARAMETER TEST CONDITIONS(1) MIN TYP MAX UNIT VDD = 3 V 14 × t SCLK ADS7887 VDD = 5 V 14 × t SCLK tconv Conversion time ns VDD = 3 V 12 × t SCLK ADS7888 VDD = 5V 12 × t SCLK VDD = 3 V 40 Minimum quiet time needed from bus 3-state to start tq ns of next conversion VDD = 5 V 40 VDD = 3 V 15 25 td1 Delay time, CS low to first data (0) out ns VDD = 5 V 13 25 VDD = 3 V 10 tsu1 Setup time, CS low to SCLK low ns VDD = 5 V 10 VDD = 3 V 15 25 td2 Delay time, SCLK falling to SDO ns VDD = 5 V 13 25 VDD < 3 V 7 th1 Hold time, SCLK falling to data valid(2) ns VDD > 5 V 5.5 VDD = 3 V 10 25 td3 Delay time, 16th SCLK falling edge to SDO 3-state ns VDD = 5 V 8 20 VDD = 3 V 25 40 tw1 Pulse duration, CS ns VDD = 5 V 25 40 VDD = 3 V 17 30 td4 Delay time, CS high to SDO 3-state, Figure 3 ns VDD = 5 V 15 25 VDD = 3 V 0.4 × t SCLK twH Pulse duration, SCLK high ns VDD = 5 V 0.4 × t SCLK VDD = 3 V 0.4 × t SCLK twL Pulse duration, SCLK low ns VDD = 5 V 0.4 × t SCLK VDD = 3 V 25 Frequency, SCLK MHz VDD = 5 V 25 Delay time, second falling edge of clock and CS to VDD = 3 V -2 5 td5 enter in powerdown (use min spec not to accidently ns VDD = 5 V -2 5 enter in powerdown) Figure 4 Delay time, CS and 10th falling edge of clock to VDD = 3 V 2 -5 td6 enter in powerdown (use max spec not to accidently ns VDD = 5 V 2 -5 enter in powerdown) Figure 4 (1) 3-V Specifications apply from 2.35 V to 3.6 V, and 5-V specifications apply from 4.75 V to 5.25 V. (2) With 50-pf load. 7 |
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