LC78857V Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer	LC78857V
Beschreibung	Digital Audio D/A Converter IC with On-Chip Digital Filters
Hersteller	Sanyo Semicon Device
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Gesamt 11 Seiten Ordering number : EN*5537A Preliminaly CMOS IC LC78857V Digital Audio D/A Converter IC with On-Chip Digital Filters Overview The LC78857V is a sigma-delta type D/A converter for use in digital audio systems. It provides both digital and analog filters on chip. Features • Built-in 8x oversampling digital filters: 3-stage FIR structure (31st order, 11th order, and 3rd order filters) • Analog low-pass filter • Digital deemphasis (handles Fs = 44.1 kHz operation) • Digital attenuator • Soft muting • Supports a 384fs system clock rate. • 5-V single-voltage power supply • Fabricated in a silicon gate CMOS process. Package Dimensions unit: mm 3175A-SSOP24 [LC78857V] SANYO: SSOP24 Specifications Absolute Maximum Ratings at VSS = 0 V Parameter Maximum supply voltage Input voltage Output voltage Operating temperature Storage temperature Symbol VDD max VIN VOUT Topr Tstg Conditions Ratings –0.3 to +7.0 –0.3 to VDD +0.3 –0.3 to VDD +0.3 –30 to +75 –40 to +125 Unit V V V °C °C Allowable Operating Ranges at Ta = 25°C Parameter Supply voltage Input voltage Operating temperature Symbol VDD TIN Topr Conditions min 3.5 0 –30 Ratings typ 5.0 max 5.5 VDD +75 Unit V V °C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN D3097HA (OT) No. 5537-1/11 LC78857V Input Setup 1. Digital audio data input The digital audio data is a 16-bit serial signal in an MSB-first two’s complement format. The 16-bit serial data is input from the DATA pin to an internal register on the rising edge of the BCLK signal, and is read in on the rising and falling edges of the LRCK signal. Digital Audio Data Input Timing 2. Mode setup The method used to set the speed (normal/double), deemphasis, and digital attenuator settings differs depending on the state of the mode pin (MODE). • When MODE is low: serial input mode In this mode, the speed (normal/double), deemphasis, and digital attenuator settings are set by inputting serial data to the DAT/MT pin. <Data Format> Attenuator data *: The SH/EMP signal may also have the form shown by the dotted line. Notes:DAT/MT and SH/EMP: These pins must be held fixed (low or high) at all times other than the data transfer period (t1 in the figure). LAT/ND: This pin must be held high at all times other than during data acquisition. • A0 (ND): Normal/double speed flag • A1 (EMP): Deemphasis flag A0 (ND) L H Normal/double speed Normal speed Double speed A1 (EMP) L H Deemphasis Off On The deemphasis function supports operation at fs = 44.1 kHz. No. 5537-6/11 6 Page
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Teilenummer	Beschreibung	Hersteller
LC78857V	Digital Audio D/A Converter IC with On-Chip Digital Filters	Sanyo Semicon Device

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