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ADC0803LCN Arkusz danych(PDF) 5 Page - Texas Instruments |
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ADC0803LCN Arkusz danych(HTML) 5 Page - Texas Instruments |
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5 / 56 page  ADC0801, ADC0802, ADC0803, ADC0804, ADC0805 www.ti.com SNOSBI1C – NOVEMBER 2009 – REVISED JUNE 2015 6.5 Operating Ratings over operating free-air temperature range (unless otherwise noted) (1) (2). MIN MAX UNIT ADC0804LCJ –40 85 ADC0801/02/03/05LCN –40 85 Temperature °C ADC0804LCN 0 70 ADC0802/04LCWM 0 70 Range of VCC 4.5 6.3 VDC (1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its specified operating conditions. (2) All voltages are measured with respect to GND, unless otherwise specified. The separate A GND point should always be wired to the D GND. 6.6 Electrical Characteristics The following specifications apply for VCC = 5 VDC, TMIN ≤ TA ≤ TMAX and fCLK = 640 kHz (unless otherwise specified). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ADC0801: Total Adjusted Error(1) With Full-Scale Adj. (See Full-Scale) ±1/4 ADC0802: Total Unadjusted VREF/2=2.500 VDC ±1/2 Error(1) ADC0803: Total Adjusted Error(1) With Full-Scale Adj. (See Full-Scale) ±1/2 LSB ADC0804: Total Unadjusted Error VREF/2=2.500 VDC ±1 (1) ADC0805: Total Unadjusted Error VREF/2-No Connection ±1 (1) ADC0801/02/03/05 2.5 8 VREF/2 Input Resistance (Pin 9) k Ω ADC0804 (2) 0.75 1.1 Analog Input Voltage Range V(+) or V(–)(3) GND–0.05 VCC+0.05 VDC DC Common-Mode Error Over Analog Input Voltage Range ±1/16 ±1/8 LSB VCC=5 VDC ±10% Over Allowed VIN(+) and VIN(–) Power Supply Sensitivity ±1/16 ±1/8 LSB Voltage Range(3) (1) None of these ADCs requires a zero adjust (see Zero Error). To obtain zero code at other analog input voltages see Errors and Reference Voltage Adjustments. (2) The VREF/2 pin is the center point of a two-resistor divider connected from VCC to ground. In all versions of the ADC0801, ADC0802, ADC0803, and ADC0805, and in the ADC0804LCJ, each resistor is typically 16 k Ω. In all versions of the ADC0804 except the ADC0804LCJ, each resistor is typically 2.2 k Ω. (3) For VIN(−)≥ VIN(+) the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see block diagram) which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than the VCC supply. Be careful, during testing at low VCC levels (4.5V), as high level analog inputs (5V) can cause this input diode to conduct–especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows 50 mV forward bias of either diode. This means that as long as the analog VIN does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 VDC to 5 VDC input voltage range will therefore require a minimum supply voltage of 4.950 VDC over temperature variations, initial tolerance and loading. 6.7 AC Electrical Characteristics The following specifications apply for VCC=5 VDC and TMIN≤ TA≤TMAX (unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT fCLK = 640 kHz (1) 103 114 µs TC Conversion Time See (2)(1) 66 73 1/fCLK Clock Frequency 100 640 1460 kHz fCLK VCC = 5V (2) Clock Duty Cycle 40% 60% INTR tied to WR with CS = 0 VDC, CR Conversion Rate in Free-Running Mode 8770 9708 conv/s fCLK = 640 kHz (1) Accuracy is specified at fCLK = 640 kHz. At higher clock frequencies accuracy can degrade. For lower clock frequencies, the duty cycle limits can be extended so long as the minimum clock high time interval or minimum clock low time interval is no less than 275 ns. (2) With an asynchronous start pulse, up to 8 clock periods may be required before the internal clock phases are proper to start the conversion process. The start request is internally latched. Refer to Detailed Description. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 |
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