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X9314WMIZ-3 Datasheet(PDF) 3 Page - Intersil Corporation |
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X9314WMIZ-3 Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 8 page 3 FN8178.3 July 24, 2014 Submit Document Feedback Typical Attenuation Characteristics (dB) Principles of Operation There are three sections of the X9314: the input control, counter and decode section; the nonvolatile memory; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. Under the proper conditions the contents of the counter can be stored in nonvolatile memory and retained for future use. The resistor array is comprised of 31 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. The INC, U/D and CS inputs control the movement of the wiper along the resistor array. With CS set LOW the X9314 is selected and enabled to respond to the U/D and INC inputs. HIGH to LOW transitions on INC will increment or decrement (depending on the state of the U/D input) a five bit counter. The output of this counter is decoded to select one of thirty-two wiper positions along the resistive array. The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. The value of the counter is stored in nonvolatile memory whenever CS transistions HIGH while the INC input is also HIGH. When the X9314 is powered down, the last counter position stored will be maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the counter is reset to the value last stored. Operation Notes The system may select the X9314, move the wiper and deselect the device without having to store the latest wiper position in nonvolatile memory. The wiper movement is performed as described above; once the new position is reached, the system would keep the INC LOW while taking CS HIGH. The new wiper position would be maintained until changed by the system or until a power-up/down cycle recalled the previously stored data. This would allow the system to always power up to a preset value stored in nonvolatile memory; then during system operation minor adjustments could be made. The adjustments might be based on user preference, system parameter changes due to temperature drift, etc. The state of U/D may be changed while CS remains LOW. This allows the host system to enable the X9314 and then move the wiper up and down until the proper trim is attained. tIW/RTOTAL The electronic switches on the X9314 operate in a “make before break” mode when the wiper changes tap positions. If the wiper is moved several positions multiple taps are connected to the wiper for tIW (INC to VW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. Power-up and Down Requirement The are no restrictions on the sequencing of VCC and the voltages applied to the potentiometer pins during power-up or power-down conditions. During power-up, the data sheet parameters for the DCP do not fully apply until 1 millisecond after VCC reaches its final value. The VCC ramp rate spec is always in effect. TAP POSITION 0 4 8 12 16 20 24 28 31 -20 -40 -43.5 0 -60 X9314 |
Similar Part No. - X9314WMIZ-3 |
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Similar Description - X9314WMIZ-3 |
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