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ADS-937MC Arkusz danych(PDF) 3 Page - Murata Power Solutions Inc. |
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ADS-937MC Arkusz danych(HTML) 3 Page - Murata Power Solutions Inc. |
3 / 8 page 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. THERMAL REQUIREMENTS All DATEL sampling A/D converters are fully characterized and specified over operating temperature (case) ranges of 0 to +70°C and –55 to +125°C. All room-temperature (TA = +25°C) production testing is performed without the use of heat sinks or forced-air cooling. Thermal impedance figures for each device are listed in their respective specification tables. These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure devices do not overheat. The ground and power planes beneath the package, as well as all pcb signal runs to and from the device, should be as heavy as possible to help conduct heat away from the package. Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than "socketed", and of course, minimal air flow over the surface can greatly help reduce the package temperature. +25°C 0 TO +70°C –55 TO +125°C MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS ANALOG OUTPUT Internal Reference Voltage +4.95 +5.0 +5.05 +4.95 +5.0 +5.05 +4.95 +5.0 +5.05 Volts Drift — ±30 — — ±30 — — ±30 — ppm/°C External Current — 1 — — 1 — — 1 — mA 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 / Complementary (Offset) Binary POWER REQUIREMENTS Power Supply Ranges +15V Supply +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 Volts –15V Supply –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 Volts +5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts –5V Supply –4.75 –5.0 –5.25 –4.75 –5.0 –5.25 –4.75 –5.0 –5.25 Volts Power Supply Currents +15V Supply — +7 +9 — +7 +9 — +7 +9 mA –15V Supply — –8 -10 — -8 -10 — -8 -10 mA +5V Supply — +133 +145 — +133 +145 — +133 +145 mA -5V Supply — -72 -80 — -72 -80 — -72 -80 mA Power Dissipation — 1.25 1.35 — 1.25 1.35 — 1.25 1.35 Watts Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V Footnotes: All power supplies must be on before applying a start convert pulse. All supplies and the clock (START CONVERT) must be present during warm-up periods. The device must be continuously converting during this time. Contact Murata-PS for other input voltage ranges. A 1MHz clock with a 500nsec positive pulse width (50% duty cycle) is used for all production testing. Any duty cycle may be used as long as a minimum positive pulse width of 20nsec is maintained. For applications requiring lower sampling rates, clock frequencies less than 1MHz may be used. This is the time required before the A/D output data is valid once the analog input is back within the specified range. TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-937 requires careful attention to pc-card layout and power supply decou- pling. The device's ground pins are not connected to each other internally. For optimal performance, tie all ground pins (2, 12 and 13) directly to a large analog ground plane beneath the package. The device's +5V supply pins are not connected to each other inter- nally and should be connected to a clean analog +5V supply. Bypass all power supplies and the +5V REFERENCE OUTPUT (pin 5) 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. Tie a 47μF capacitor between COMPENSATION (pin 7) and ground (See figure 2.). 2. The ADS-937 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 Figure 2. When using this circuitry, or any similar offset and gain calibration hardware, make adjustments following warm-up. To avoid interaction, always adjust offset before gain. Float pins 4 and 6 if not using offset and gain adjust circuits. Effective bits is equal to: 6.02 (SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude Actual Input Amplitude MDA_ADS-937.A01 Page 3 of 8 ADS-937 16-Bit, 1MHz Sampling A/D Converters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com |
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