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ADC10738CIWM Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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ADC10738CIWM Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 29 page Ordering Information Industrial Temperature Range Package −40˚C ≤ T A ≤ +85˚C ADC10731CIWM * M16B ADC10732CIWM * M20B ADC10734CIMSA * MSA20 ADC10734CIWM * M20B ADC10738CIWM M24B * These products are obsolete or on lifetime buy and shown for reference only. Pin Descriptions CLK The clock applied to this input controls the suc- cessive approximation conversion time interval, the acquisition time and the rate at which the serial data exchange occurs. The rising edge loads the information on the DI pin into the mul- tiplexer address shift register. This address con- trols which channel of the analog input multi- plexer (MUX) is selected. The falling edge shifts the data resulting from the A/D conversion out on DO. CS enables or disables the above functions. The clock frequency applied to this input can be between 5 kHz and 3 MHz. DI This is the serial data input pin. The data applied to this pin is shifted by CLK into the multiplexer address register. Tables 1, 2, 3 show the multi- plexer address assignment. DO The data output pin. The A/D conversion result (DB0-SIGN) are clocked out by the failing edge of CLK on this pin. CS This is the chip select input pin. When a logic low is applied to this pin, the rising edge of CLK shifts the data on DI into the address register. This low also brings DO out of TRI-STATE after a conver- sion has been completed. PD This is the power down input pin. When a logic high is applied to this pin the A/D is powered down. When a low is applied the A/D is powered up. SARS This is the successive approximation register status output pin. When CS is high this pin is in TRI-STATE. With CS low this pin is active high when a conversion is in progress and active low at all other times. CH0–CH7 These are the analog inputs of the MUX. A chan- nel input is selected by the address information at the DI pin, which is loaded on the rising edge of CLK into the address register (see Tables 1, 2, 3). The voltage applied to these inputs should not exceed AV + or go below GND by more than 50 mV. Exceeding this range on an unselected channel will corrupt the reading of a selected channel. COM This pin is another analog input pin. It can be used as a “pseudo ground” when the analog multiplexer is single-ended. V REF+ This is the positive analog voltage reference in- put. In order to maintain accuracy, the voltage range V REF (VREF =VREF+–VREF−) is 0.5 VDCto 5.0 V DC and the voltage at VREF+ cannot exceed AV + +50 mV. V REF− The negative voltage reference input. In order to maintain accuracy, the voltage at this pin must not go below GND − 50 mV or exceed AV + +50mV. AV +,DV+ These are the analog and digital power supply pins. These pins should be tied to the same power supply and bypassed separately. The op- erating voltage range of AV + and DV+ is 4.5 V DC to 5.5 V DC. DGND This is the digital ground pin. AGND This is the analog ground pin. www.national.com 3 |
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