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TLV1548M Datasheet(PDF) 10 Page - Texas Instruments |
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TLV1548M Datasheet(HTML) 10 Page - Texas Instruments |
10 / 37 page TLV1544C, TLV1544I, TLV1548C, TLV1548I, TLV1548M LOW-VOLTAGE 10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 4/8 ANALOG INPUTS SLAS139C – DECEMBER 1996 – REVISED JANUARY 1999 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 tACQ Aa Ab Ab Ac Ad XDa Db Db Dc CS CSTART DATA IN EOC DATA OUT Async Flag Read Out Cycle Read Out Cycle Read Out Cycle FS (DSP Mode) Complete Extended Sample Cycle tACQ NOTES: A. Aa = Address for input channel a. B. Da = Conversion result from channel a. Hi–Z Hi–Z Hi–Z Hi–Z Hi–Z Hi–Z Normal Cycle Normal Cycle Extended Sample Cycle Extended Sample Cycle Figure 2. Extended Sampling Operation reference voltage inputs There are two reference inputs used with the TLV1544/TLV1548, REF+ and REF–. These voltage values establish the upper and lower limits of the analog inputs to produce a full-scale and zero-scale reading respectively. The values of REF+, REF–, and the analog input should not exceed the positive supply or be lower than GND consistent with the specified absolute maximum ratings. The digital output is at full scale when the input signal is equal to or higher than REF+ and is at zero when the input signal is equal to or lower than REF–. programmable conversion rate The TLV1544/TLV1548 offers two conversion rates to maximize battery life when high-speed operation is not necessary. The conversion rate is programmable. Once the conversion rate has been selected, it takes effect immediately in the same cycle and stays at the same rate until the other rate is chosen. The conversion rate should be set at power up. Activation and deactivation of the power-down state (digital logic active) has no effect on the preset conversion rate. |
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