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PDF ( 数据手册 , 数据表 ) LC78835

零件编号 LC78835
描述 18 Bits Digital Filter and D/A Converter for Digital Audio
制造商 Sanyo Semicon Device
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LC78835 数据手册, 描述, 功能
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







LC78835 pdf, 数据表
LC78835K, 78835KM
2. Initialization
Initialization is necessary when power is applied or the system clock is replaced. When the INITB pin has been set
to an “L” level, the supply to XIN, BCLK, and LRCK should be connected only after the supply has stabilized at the
“L” level. As shown in the figure, a period greater than one LRCK cycle is required.
When INITB = “L,” all 18-bit digital filter outputs set to 0, and the D/A converter’s output (CH1OUT, CH2OUT)
equals 0 analog output (approximately (VREFH + VREFL)/2 electric potential).
3. System Clock
This IC supports four system clock speeds including 384 fs, 392 fs, 448 fs, and 512 fs. These may be selected using
the CKSL1 and CKSL2 pins.
CKSL1
L
L
H
H
CKSL2
L
H
L
H
System Clock
384 fs
392 fs
448 fs
512 fs
• CKOUT Pin
When operating at 392 fs, clock output is 196 fs or half that of the system clock. All other speeds result in clock
output equal to that of the system.
No. 4624-8/14














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