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LC78857V の電気的特性と機能
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LC78857VのメーカーはSanyo Semicon Deviceです、この部品の機能は「Digital Audio D/A Converter IC with On-Chip Digital Filters」です。 |
製品の詳細 ( Datasheet PDF )
| 部品番号 | LC78857V |
| |
| 部品説明 | Digital Audio D/A Converter IC with On-Chip Digital Filters | ||
| メーカ | Sanyo Semicon Device | ||
| ロゴ |  |
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このページの下部にプレビューとLC78857Vダウンロード（pdfファイル）リンクがあります。 Total 11 pages
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
1 Page  
LC78857V
Analog Characteristics at Ta = 25°C, VDD = 5.0 V
Parameter
Total harmonic distortion
Signal-to-noise ratio
Crosstalk
Full scale output level
Dynamic range
Output load resistance
Test Circuit
Symbol
Conditions
THD+N
S/N
CT
VFS
DR
RL
1kHz, 0 dB
JIS-A
1kHz, 0 dB
1 kHz, 0dB
JIS-A
Pins 2 and 23
min
90
88
2.8
84
5
Ratings
typ
0.008
96
92
3.0
87
max
0.012
3.2
Unit
%
dB
dB
Vp-p
dB
kΩ
See the application circuit example
PG: Pattern generator (signal generator)
Filter: Band limiting filter
Block Diagram
Analog low-
pass filter
(left channel)
Analog low-
pass filter
(right channel)
PWM output
circuit
(left channel)
PWM output
circuit
(right channel)
Noise shaper
(left channel)
Noise shaper
(right channel)
8 × oversampling
digital filters
Timing
generator
Interface circuit
No. 5537-3/11
3Pages 
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 | |||
| ページ | 合計 : 11 ページ | ||
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PDF ダウンロード | [ LC78857V データシート.PDF ] | |
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データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
共有リンク
Link :| 部品番号 | 部品説明 | メーカ |
| LC78857V | Digital Audio D/A Converter IC with On-Chip Digital Filters | Sanyo Semicon Device |