LC78835 Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer	LC78835
Beschreibung	18 Bits Digital Filter and D/A Converter for Digital Audio
Hersteller	Sanyo Semicon Device
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Gesamt 14 Seiten Ordering number : EN4624B CMOS IC LC78835K, 78835KM 18 Bits Digital Filter and D/A Converter for Digital Audio Overview The LC78835K and 78835KM are 18-bit digital-to-analog D/A converter CMOS ICs with an on-chip eight-times oversampling digital filter. The LC78835 and the LC78835M are pin compatible. Features • Digital filter — 8 fs oversampling filter: 3-stage finite-impulse- response (FIR) filter design (43rd-, 11th-, and third- orders) — De-emphasis filter: Supports fs = 32 kHz, 44.1 kHz, or 48 kHz — Soft mute — Noise shaper — Supports double-rate sampling • D/A converter — Dynamic level-shifting 18-bit digital-to-analog converter — On-chip 2-channel D/A converter (with corresponding output) — On-chip output op-amp — Supports 384 fs, 392 fs, 448 fs, or 512 fs system clock — Single 5 V supply — Permits low-voltage operation (3.5 V) — Low-power silicon-gate CMOS process Package Dimensions unit: mm 3092-DIP24W [LC78835K] unit: mm 3155-MFP24 [LC78835KM] SANYO: DIP24W SANYO: MFP24 SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 73696HA (OT)/N1094TH (OT)/82793JN No. 4624-1/14 LC78835K, 78835KM Description of Operation 1. Digital Filter The LC78835K and 78835KM perform arithmetic functions as shown in the following block diagrams. • Oversampling Constructed of twice as many interpolation filters with a cascade connection arrangement using finite-impulse- response (FIR) filters. When operating in normal-rate mode, data is transferred through a three-stage cascading process consisting of 43rd-order, 11th-order, and third-order finite impulse response (FIR) filters connected together to produce an eight-times oversampled signal. When operating in double-rate mode, data is transferred through a two-stage cascading process consisting of 43rd-order and second-order finite-impulse-response (FIR) connected filters to give a four-times oversampled signal. For further details concerning filter characteristics, refer to page 12. • De-emphasis Digital de-emphasis is performed using a first-order infinite-impulse-response (IIR) filter. Filter supported sampling frequencies include fs = 32 kHz, 44.1 kHz and 48 kHz (frequencies are all doubled with double-rate mode). No. 4624-6/14 6 Page LC78835K, 78835KM Filter Characteristics (theoretical values) Normal-rate mode: 8 fs oversampling Double-rate mode: 4 fs oversampling Ripple: within ±0.05 dB Attenuation amount: –40 dB or less •Normal Rate (De-emphasis Off) •Double Rate (De-emphasis Off) No. 4624-12/14 12 Page
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