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LM1972MNOPB Datasheet(PDF) 4 Page - Texas Instruments |
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LM1972MNOPB Datasheet(HTML) 4 Page - Texas Instruments |
4 / 21 page LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com Timing Diagram Figure 3. Timing Diagram PIN DESCRIPTIONS Signal Ground (3, 19): Each input has its own independent ground, GND1 and GND2. Signal Input (4, 20): There are 2 independent signal inputs, IN1 and IN2. Signal Output (2, 17): There are 2 independent signal outputs, OUT1 and OUT2. Voltage Supply (13, 15): Positive voltage supply pins, VDD1 and VDD2. Voltage Supply (7, 18): Negative voltage supply pins, VSS1 and VSS2. To be tied to ground in a single supply configuration. AC Ground (1, 5, 6, 14, 16): These five pins are not physically connected to the die in any way (i.e., No bondwires). These pins must be AC grounded to prevent signal coupling between any of the pins nearby. Pin 14 should be connected to pins 13 and 15 for ease of wiring and the best isolation, as an example. Logic Ground (8): Digital signal ground for the interface lines; CLOCK, LOAD/SHIFT, DATA-IN and DATA-OUT. Clock (9): The clock input accepts a TTL or CMOS level signal. The clock input is used to load data into the internal shift register on the rising edge of the input clock waveform. Load/Shift (10): The load/shift input accepts a TTL or CMOS level signal. This is the enable pin of the device, allowing data to be clocked in while this input is low (0V). Data-In (11): The data-in input accepts a TTL or CMOS level signal. This pin is used to accept serial data from a microcontroller that will be latched and decoded to change a channel's attenuation level. Data-Out (12): This pin is used in daisy-chain mode where more than one μPot is controlled via the same data line. As the data is clocked into the chain from the μC, the preceding data in the shift register is shifted out the DATA-OUT pin to the next μPot in the chain or to ground if it is the last μPot in the chain. The LOAD/SHIFT line goes high once all of the new data has been shifted into each of its respective registers. 4 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 |
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