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CS5371-BS Datasheet(PDF) 11 Page - Cirrus Logic |
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CS5371-BS Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 22 page CS5371 CS5372 DS255F3 11 input signal is a steady state DC signal within ±50 mV of the common mode input voltage. Idle tones result from patterns in the output bitstream and appear in the measurement spectrum about -135 dB down from full scale. Idle tones can be eliminated by adding differential DC offset to the modulator inputs. The added off- set should be applied differentially to the inputs, common mode offsets do not affect idle tones. 5.1. Offset Enable - OFST If the analog inputs are near the common mode voltage when no signal is present, the OFST pin can be used to eliminate idle tones. When OFST=1, -50 mV of differential offset is added to the modulator analog inputs to push the idle tones out of the measurement bandwidth. Care should be taken that when OFST is active, offset voltages generated by external circuitry do not negate the internally added offset. 5.2. Offset Drift Offset drift characteristics vary from part to part and with changes in the power supply voltages. If the CS5371/72 is used in precision DC measure- ment applications where offset drift is to be mini- mized, the power supplies should be well regulated. For the lowest offset drift, the CS5371/72 modula- tors should operate with an MCLK of 2.048 MHz. The offset drift rate is inversely proportional to clock frequency, with slower modulator clock rates exhibiting more offset drift. Operating from an MCLK of 1.024 MHz results in twice the offset drift rate compared to an MCLK of 2.048 MHz. Because offset drift is not linear with temperature, an exact drift rate per °C cannot be specified. The CS5371/72 modulators will exhibit approximately 5 ppm/°C of offset drift operating with an MCLK of 2.048 MHz. 6. VOLTAGE REFERENCE INPUTS The CS5371/72 modulators are designed to oper- ate with a 2.5 V voltage reference applied across the VREF+ and VREF- pins to set the full-scale sig- nal range of the analog inputs. A 2.5 V voltage ref- erence results in the highest dynamic range and best signal-to-noise performance, though smaller reference voltages may be used. When the CS5371/72 modulators are operated with a 2.5 V reference, the analog inputs measure full-scale signals of 5 volts peak-to-peak fully differential. In a single supply power configuration the voltage reference output should be connected to the VREF+ pin with the VREF- pin connected to ground. In a dual supply power configuration the voltage reference should be powered from the VA+ and VA- supplies, with the modulator VREF+ pin connected to the voltage reference output and the VREF- pin connected to VA-. Because most 2.5 V voltage references require a power supply voltage greater than 3 V to operate, when powering the voltage reference from dual supplies the reference voltage into the VREF+ pin should be defined rela- tive to the VA- supply. The selected voltage reference should produce less than 1 µVrms of noise in the measurement bandwidth on the VREF+ pin. The digital filter out- put word rate selection determines the bandwidth |
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