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PDF LC78857V Data sheet ( Hoja de datos )

Número de pieza LC78857V
Descripción Digital Audio D/A Converter IC with On-Chip Digital Filters
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo



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No Preview Available ! LC78857V Hoja de datos, Descripción, Manual

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 pdf
LC78857V
Circuit Operation
The LC78857V consists of three main blocks: the digital filter block, the sigma-delta D/A converter block, and the
analog filter block.
[Digital Filter Block]
The LC78857V performs the following calculations.
• Normal speed mode:
Input
Attenuator
Deemphas
is first-
order IIR
filter
31st-order
FIR filter
11th-order
FIR filter
3rd-order
FIR filter
To the sigma-delta
D/A converter
• Double speed mode:
This mode is used, for example, when dubbing a CD to cassette tape at double speed. Although the XIN has the same
frequency as normal speed mode, BCLK, LRCK, and DATA are input at twice the rate used in normal speed.
Input
Attenuator
Deemphas
is first-
order IIR
filter
31st-order
FIR filter
3rd-order
FIR filter
fs* = double speed input = 2 × fs.
To the sigma-delta
D/A converter
[Sigma-Delta D/A Converter Block]
This circuit accepts 8fs data input and outputs a 384fs 1-bit data sequence.
From the
digital filters
Front-end
interpolation
3rd-order
noise
shaper
PWM D/A
converter
1-bit output A
1-bit output B
[Analog Low-Pass Filter Block]
This block consists of an analog low-pass filter that consists of on-chip resistors, capacitors, and operational amplifiers.
This block converts the 384fs 1-bit data streams A and B directly to an analog voltage output.
1-bit output A
1-bit output B
No. 5537-5/11

5 Page





LC78857V arduino
LC78857V
Power Supply Timing
• The analog system power supplies (AVDDL and AVDDR) and the digital system power supply (DVDD) must be
applied and cut at the same time.
• If time lags between these power supplies are unavoidable, the timing must meet one of the following two conditions.
(1) The power on (and power off) time lag must be under 3 ms as shown in figure 1.
(2) If the time lag must be over 3 ms, then the rise time for the first power supply to be powered on (or powered off)
must exceed 5 ms, and furthermore, the time difference must exceed 50 ms as shown in figure 2.
Under 3 ms
Figure 1
Under 3 ms
Over 5 ms Under 50 ms
Over 5 ms Under 50 ms
Figure 2
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
ΠAccept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of December, 1997. Specifications and information herein are subject to
change without notice.
PS No. 5537-11/11

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