SANYO LC78835KM, LC78835K Datasheet
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 thirdorders)
— 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
unit: mm
3155-MFP24
CMOS IC
Ordering number : EN4624B
73696HA (OT)/N1094TH (OT)/82793JN No. 4624-1/14
SANYO: DIP24W
[LC78835K]
SANYO: MFP24
[LC78835KM]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
18 Bits Digital Filter and D/A Converter
for Digital Audio
LC78835K, 78835KM
Specifications
Absolute Maximum Ratings at Ta = 25°C, VSS= 0°C
Allowable Operating Ranges
DC Characteristics
at Ta = –30 to +75°C, VDD= 3.5 to 5.5 V, VSS= 0 V
Note: * 3, 4, 5, 6, 7, 11, 13, 14, 15, 16, 17 and 18 pin
AC Characteristics
at Ta = –30 to +75°C, VDD= 3.5 to 5.5 V, VSS= 0 V
No. 4624-2/14
LC78835K, 78835KM
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
DD
max –0.3 to + 7.0 V
Input voltage V
IN
–0.3 to VDD+ 0.3 V
Output voltage V
OUT
–0.3 to VDD+ 0.3 V
Operating temperature Topr –30 to + 75 °C
Storage temperature Tstg –40 to + 125 °C
Parameter Symbol Conditions
Ratings
Unit
min typ max
Supply voltage V
DD
3.5 5.0 5.5 V
Reference voltage high Vref H V
DD
– 0.3 V
DD
V
Reference voltage low Vref L 0 0.3 V
Operating temperature Topr –30 +75 °C
Parameter Symbol Conditions
Ratings
Unit
min typ max
Input high level voltage (1) V
IH
1 3, 4, 5, 6, 7, 13, 14, 15, 16, 17 and 18 pin 2.2 V
Input low level voltage (1) V
IL
1 3, 4, 5, 6, 7, 13, 14, 15, 16, 17 and 18 pin 0.8 V
Input high level voltage (2) V
IH
2 11 pin 0.7V
DD
V
Input low level voltage (2) V
IL
2 11 pin 0.3V
DD
V
Output high level voltage V
OH
9 pin: IOH= –3 mA 2.4 V
Output low level voltage V
OL
9 pin: IOL= 3 mA 0.4 V
Input leakage current I
L
*, VI= VSS, V
DD
–25 +25 µA
Parameter Symbol Conditions
Ratings
Unit
min typ max
Oscillation frequency f
X
XIN pin for crystal oscillator 1.0 25 MHz
Clock pulse width t
CW
With external clock input to other than XIN pin
18 ns
Clock pulse phase t
CY
With external clock input to other than XIN pin
40 1000 ns
BCLK pulse width t
BCW
60 ns
BCLK pulse phase t
BCY
120 ns
Data setup time t
DS
40 ns
Data hold time t
DH
40 ns
LRCK setup time t
LRS
40 ns
LRCK hold time t
LRH
40 ns
Audio Input Waveforms
Electrical Characteristics (1)
at Ta = 25°C, AVDD= DVDD= VrefH = 5.0 V, AGND = DGND = VrefL = 0 V, unless otherwise specified
Note: 1. “0 dB” signifies full scale.
2. XIN pulse width (pin 11) 1.5 to 3.5 V, fx = 16.9344 MHz
Test circuit: Based on application circuit
No. 4624-3/14
LC78835K, 78835KM
Parameter Symbol Conditions
Ratings
Unit
min typ max
D/A converter resolution RES 18 Bits
Total harmonic distortion THD At 1 kHz, 0 dB
*1
0.08 %
Dynamic range DR At 1 kHz, –60 dB 90 dB
Crosstalk CT At 1 kHz, 0 dB –85 dB
Signal-to-noise ratio S/N JIS-A 96 dB
Full-scale output voltage VFS 3.0 V
P-P
Power dissipation Pd
*2
135 200 mW
Output load resistance RL 21, 23 pin 5 kΩ
Electrical Characteristics (2)
at Ta = 25°C, AVDD= DVDD= VrefH 3.5 V, AGND = DGND = VrefH = 0 V, unless otherwise specified
Note: 1. “0 dB” signifies full scale.
2. XIN pulse width (pin 11) 1.0 to 2.5 V, fx = 16.9344 MHz
Test circuit: Based on application circuit
Block Diagram
Pin Assignment
No. 4624-4/14
LC78835K, 78835KM
Parameter Symbol Conditions
Ratings
Unit
min typ max
D/A converter resolution RES 18 Bits
Total harmonic distortion THD At 1 kHz, 0dB
*1
0.09 %
Dynamic range DR At 1 kHz, –60 dB 90 dB
Crosstalk CT At 1 kHz, 0 dB –85 dB
Signal-to-noise ratio S/N JIS-A 96 dB
Full-scale output voltage VFS 2.1 V
P-P
Power dissipation Pd
*2
50 75 mW
Output load resistance RL 21, 23 pin 15 kΩ
Pin Description
No. 4624-5/14
LC78835K, 78835KM
Number Name Description
1 REFH Reference voltage “H” pin
Normally connected to AGND via a capacitor
2 VrefH Reference voltage “H” input pin
3 MUTE Mute signal input pin
Soft mute is on when high
4 D/N Normal/double-speed operation toggle
Double-speed operation when high, normal operation when low
5 BCLK Bit clock input pin
6 DATA Digital audio data input pin
2’s complement code, with input from the most significant bit (MSB)
7 LRCK Left-right clock input pin
Channel 1 when high, channel 2 when low
8 DV
DD
Digital power supply pin
9 CKOUT Clock output pin
When at 392 fs: 196 fs clock
When not at 392 fs: XIN-frequency clock
10 XOUT Crystal oscillator output pin (system clock output pin)
11 XIN Crystal oscillator input pin (system clock input pin)
12 DGND Digital ground pin
13 INITB Initialization signal input pin
Initialization performed when low
14 EMP On/Off toggle for the de-emphasis filter
On when high, off when low
15 FS1 32 kHz/44.1 kHz/48 kHz selector for the de-emphasis filter
16 FS2
17 CKSL1 System clock selector pin
18 CKSL2
19 VrefL Reference voltage “L” input pin
20 REFL Reference voltage “L” pin
Normally connected to AGND via a capacitor
21 CH2OUT Channel 2 analog output pin
22 AGND Analog ground pin
23 CH1OUT Channel 1 analog output pin
24 AV
DD
Analog power supply pin
FS1 L H H L
FS2 L L H H
fs 44.1 kHz 32 kHz 48 kHz
CKSL1 CKSL2 System Clock
L L 384 fs
L H 392 fs
H L 448 fs
H H 512 fs
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