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ADS-118 bảng dữ liệu(PDF) 3 Page - List of Unclassifed Manufacturers |
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ADS-118 bảng dữ liệu(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 8 page ![]() ADS-118/118A ® ® 3 the adjustment circuitry shown in Figures 2a and 2b. 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. To enable the three-state outputs, connect ENABLE (pin 17) to a logic "0" (low). To disable, connect pin 17 to logic "1" (high). The three-state outputs are permanently enabled in the ADS-118A. 4. Applying a start convert pulse while a conversion is in progress (EOC = logic "1") will initiate a new and inaccurate conversion cycle. +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 ±0.001%FSR, 10V step) — 85 90 — 85 90 — 85 90 ns Overvoltage Recovery Time — 200 — — 200 — — 200 — ns A/D Conversion Rate 5 — — 5 — — 5 — — 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 Delay, Falling Edge of EOC to Output Data Valid — — 20 — — 20 — — 20 MHz Delay, Falling Edge of ENABLE to Output Data Valid — — 10 — — 10 — — 10 MHz 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 –5V Supply –4.75 –5.0 –5.25 –4.75 –5.0 –5.25 –4.9 –5.0 –5.25 Volts Power Supply Currents +5V Supply — +205 +220 — +205 +220 — +205 +220 mA –5V Supply — –80 –90 — –80 –90 — –80 –90 mA Power Dissipation — 1.3 1.5 — 1.3 1.5 — 1.3 1.5 Watts Power Supply Rejection — — ±0.1 — — ±0.1 — — ±0.1 %FSR/%V Footnotes: This is the time required before the A/D output data is valid once the analog input is back within the specified range. The minimum supply voltages of +4.9V and –4.9V for ±VDD are required for –55°C operation only. The minimum limits are +4.75V and –4.75V when operating at +125°C 6.02 (SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude Actual Input Amplitude 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. Input voltage ranges for ADS-118A is ±1.25V A 100ns wide start convert pulse is used for all production testing. For applications requiring less than an 5MHz sampling rate, wider start convert pulses can be used. NOTE: The device only requires the rising edge of a start convert pulse to operate. Effective bits is equal to: TECHNICAL NOTES 1. Obtaining fully specified performance from the ADS-118 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 perfor- mance, tie all ground pins (14, 18, and 23) 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-118 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 |
Số phần tương tự - ADS-118 |
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Mô tả tương tự - ADS-118 |
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