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ADS947 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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ADS947 Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 8 page ADS-947 3 ®® +25°C 0 to +70°C –55 to +125°C DYNAMIC PERFORMANCE (Cont.) MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS S/H Acquisition Time ( to ±0.003%FSR, 4V step) — 40 45 — 40 45 — 40 45 ns Overvoltage Recovery Time — — 100 — — 100 — — 100 ns A/D Conversion Rate 10 — — 10 — — 10 — — MHz DIGITAL OUTPUTS Logic Levels Logic "1" +2.4 — — +2.4 — — +2.4 — — Volts Logic "0" — — +0.4 — — +0.4 — — +0.4 Volts Logic Loading "1" — — –4 — — –4 — — –4 mA Logic Loading "0" — — +4 — — +4 — — +4 mA Output Coding Offset Binary POWER REQUIREMENTS Power Supply Ranges +5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.9 +5.0 +5.25 Volts –5.2V Supply –4.75 –5.2 –5.45 –4.75 –5.2 –5.45 –4.9 –5.2 –5.45 Volts Power Supply Currents +5V Supply — +250 +260 — +250 +260 — +250 +260 mA –5.2V Supply — –200 –210 — –200 –210 — –200 –210 mA Power Dissipation — 2.0 2.25 — 2.0 2.25 — 2.0 2.25 Watts Power Supply Rejection — — ±0.1 — — ±0.1 — — ±0.1 %FSR/%V Footnotes: TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-947 requires careful attention to pc card layout and power supply decoupling. The device’s analog and digital ground systems are connected to each other internally. For optimal performance, tie all ground pins (14, 19 and 24) directly to a large analog ground plane beneath the package. Bypass all power supplies to ground with 4.7µF tantalum capacitors in parallel with 0.1µF ceramic capacitors. Locate the bypass capacitors as close to the unit as possible. 2. The ADS-947 achieves its specified accuracies without the need for external calibration. If required, the device’s small initial offset and gain errors can be reduced to zero using the adjustment circuitry shown in Figures 2 and 3. When using this circuitry, or any similar offset and gain calibration hardware, make adjustments following warmup. To avoid interaction, always adjust offset before gain. 3. Applying a start convert pulse while a conversion is in progress (EOC = logic 1) will initiate a new and inaccurate conversion cycle. Data for the interrupted and subsequent conversions will be invalid. 4. A passive bandpass filter is used at the input of the A/D for all production testing. Figure 2. Optional ADS-947 Gain Adjust Calibration Circuit All power supplies should be on before applying a start convert pulse. All supplies and the clock (start convert pulses) must be present during warmup periods. The device must be continuously converting during this time. Contact DATEL for other input voltage ranges. A 10MHz clock with a 20ns positive pulse width is used for all production testing. See Timing Diagram, figure 4, for more details. To Pin 21 of ADS-947 –5V SIGNAL INPUT GAIN ADJUST 1.98k Ω 50 Ω +5V 2k Ω This is the time required before the A/D output data is valid once the analog input is back within the specified range. This time is only guaranteed if the input does not exceed ±2.2V (S/H saturation voltage). The minimum supply voltages of +4.9V and –5.1V for ±VDD are required for –55°C operation only. The minimum limits are +4.75V and –4.95V when operating at +125°C Effective bits is equal to: (SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude Actual Input Amplitude 6.02 |
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Descripción similar - ADS947 |
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