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LC78835K 数据表(PDF) 11 Page - Sanyo Semicon Device |
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LC78835K 数据表(HTML) 11 Page - Sanyo Semicon Device |
11 / 14 page • Pulse-Width Modulation (PWM) D/A Converter This is a 3-bit circuit that applies pulse width modulation to voltages V2 and V1 output from the R-string D/A converter to produce an 8-way division. Depending on the value of the data in bits D8 to D6, one of the voltages, V2 or V1, is output to the CH1OUT (or CH2OUT) pin. • Level Shift D/A Converter The variable resistors VRH and VRL are connected in series to the two ends of the R-string D/A converter resistance, configuring a 6-bit D/A conversion circuit. Depending on the values of the data in the LSBs (bits D5 to D0), VRH and VRL change as follows. (1) The sum of VRH and VRL is constant, irrespective of the data value. (2) Irrespective of the data value, VRH and VRL are in the range of 0 to 63R/512 (where R is the unit resistance of the R-string D/A converter) and resistance changes in R/512 steps in accordance with the data value. This means that the R-string D/A converter outputs, V2 and V1, each vary in the range of 0 to 63 × ∆V/512 (∆V = (VH - VL)/512) in ∆V/512 steps. — Vref H/L, REF H/L Pins The voltage on the Vref pins, used to apply the reference voltage to the resistance strings, are usually set so that VrefH = AVDD and VrefL = AGND. In addition, a 10 µF rated condenser connects REFH and AGND as well as REFL and AGND. When VrefH = 5.0 V, VrefL = 0 V, the LC78835K on-chip RH and RL resistors maximum output amplitude at 0 dB playback is output in the 3.0 Vp-p range extending from a minimum 0.6 V to maximum 3.6 V. No. 4624-11/14 LC78835K, 78835KM |
类似零件编号 - LC78835K |
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类似说明 - LC78835K |
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