SM5841H
NIPPON PRECISION CIRCUITS INC.
Audio Multi-function Digital Filter
OVERVIEW
The SM5841H is an 8-times oversampling (interpo-
lation) digital filter for digital audio reproduction
equipment. It accepts 16 or 18-bit input data, and
outputs data in 16, 18 or 20-bit format, making a
wide range of interfaces possible. It also features
digital deemphasis for 3 sampling frequencies, a
noise shaper to reduce quantization noise, a DC off-
set output and other circuits.
ORDERING INFOMATION
Device
SM5841HP
SM5841HS
Package
18pin DIP
22pin SOP
FEATURES
Functions
s
s
s
s
s
s
s
s
s
s
s
s
2-channel processing
8-times (8fs) oversampling (interpolation)
Digital deemphasis (fs = 48/44.1/32 kHz)
Serial input data
2s complement, MSB first, 16/18-bit
Serial output data
2s complement, MSB first, 16/18/20-bit
1st-order noise shaper (for 16/18-bit output only)
256fs/384fs system clock selectable
Output data DC offset (approximately 0.8%)
ON/OFF control
TTL-compatible input/outputs
5 V (standard) supply
3.2 V operating voltage
Molybdenum-gate CMOS
Filter Characteristics
s
s
s
3-stage DC FIR interpolation filter
1st stage (fs
→
2fs), 69-tap
2nd stage (2fs
→
4fs), 13-tap
3rd stage (4fs
→
8fs), 9-tap
IIR deemphasis filter for gain and phase character-
istics close to those of analog filters
Overflow limiter built-in
APPLICATIONS
s
s
s
s
s
Digital amplifiers
CD players
DAT players
DBS systems
PCM systems
NIPPON PRECISION CIRCUITS—1
SM5841H
PINOUT
18-pin DIP
PACKAGE DIMENSIONS
18-pin DIP (Unit: mm)
WSL1
CKI
CKSL
CKO
VSS
WSL2
DSF1
DSF2
RST
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
DIN
BCKI
6.20 0.25
0 15
7.62TYP
LRCI
OFST
VDD
WCKO
DOL
DOR
BCKO
1.27MAX
2.54TYP
22.05
−
0.30
1.20
−
0
+
0.30
+
0.20
+
0.14
0.51MIN
22-pin SOP
22-pin SOP (Unit: mm)
WSL1
CKI
CKSL
CKO
VSS
(NC)
(NC)
WSL2
DSF1
DSF2
RST
1
2
3
22
21
20
DIN
BCKI
13.9
±
0.3
3.00MIN 5.00MAX
4
5
6
7
8
9
10
11
19
18
17
16
15
14
13
12
OFST
(NC)
(NC)
7.8
±
0.3
5.4
±
0.2
1.8
±
0.1
VDD
WCKO
DOL
DOR
BCKO
0.4
±
0.1
0.5
±
0.2
NIPPON PRECISION CIRCUITS—2
0.05 ± 0.05
1.27
0 to 10˚
SM5841HP
SM5841HS
0.45
−
0.05
0.25 0
.05
+
0.1
0.15
−
0.05
LRCI
SM5841H
BLOCK DIAGRAM
LRCI
DIN BCKI
CKSL
CKI
CKO
System
Clock
Input data Interface
RST
DSF1
DSF2
WSL1
WSL2
Timing
Controller
Deemphasis
Controler
Input/output
word length
selector
Filter and Attenuation
Airthmetic block
OFST
Interface
Output date
WCKO
DOL
DOR
BCKO
VSS
VDD
PIN DESCRIPTION
SOP
DIP
Name
I/O
1
Input/output data select pins
1
1
WSL1
Ip
WSL1
HIGH
HIGH
8
6
WSL2
Ip
LOW
LOW
2
3
4
5
6
7
2
3
4
5
–
–
CKI
CKSL
CKO
VSS
NC
NC
Ip
Ip
O
–
–
–
System clock input
System clock select input. 384fs when HIGH, and 256fs when LOW.
System clock output. The CKI is first buffered before output on CKO.
Ground
No connection
No connection
Deemphasis select inputs
9
7
DSF1
Ip
DSF1
LOW
LOW
10
8
DSF2
Ip
HIGH
HIGH
11
12
9
10
RST
BCKO
Ip
O
DSF2
LOW
HIGH
LOW
HIGH
Deemphasis
On
On
Off
On
Sampling frequency
44.1 kHz
48.0 kHz
–
32.0 kHz
WSL2
HIGH
LOW
HIGH
LOW
Noise shaper
Off
On
On
On
Input bit length
18 bits
18 bits
16 bits
16 bits
Output bit length
20 bits
18 bits
18 bits
16 bits
Description
System reset. Reset and initialization when RST is LOW.
Output bit clock
NIPPON PRECISION CIRCUITS—3
SM5841H
SOP
13
14
15
16
17
18
19
20
21
22
DIP
11
12
13
14
–
–
15
16
17
18
Name
DOR
DOL
WCKO
VDD
NC
NC
OFST
LRCI
BCKI
DIN
I/O
1
O
O
O
–
–
–
Ip
Ip
Ip
Ip
Right-channel 8fs data output
Left-channel 8fs data output
Output word clock
5 V supply
No connection
No connection
Output data DC offset select input. Summing ON when HIGH, and OFF when LOW.
Input data sample rate (fs) clock
Input bit clock
Input data
Description
1. Ip = Input with pull-up resistor
SPECIFICATIONS
Absolute Maximum Ratings
V
SS
= 0 V
Parameter
Supply voltage range
Input voltage range
Storage temperature range
Power dissipation
Soldering temperature
Soldering time
Symbol
V
DD
V
IN
T
stg
P
D
T
sld
t
sld
Rating
−
0.3 to 7.0
−
0.3 to V
DD
+
0.3
−
40 to 125
250
255
10
Unit
V
V
°
C
mW
°
C
s
Recommended Operating Conditions
V
SS
= 0 V
Parameter
Supply voltage range
Operating temperature range
Symbol
V
DD
T
opr
Rating
3.2 to 5.5
−
20 to 80
Unit
V
°
C
NIPPON PRECISION CIRCUITS—4
SM5841H
DC Electrical Characteristics
Standard voltage: V
DD
= 4.5 to 5.5 V, V
SS
= 0 V, T
a
=
−
20 to 80
°
C
Rating
Parameter
Current consumption
HIGH-level input voltage
2
LOW-level input voltage
2
CKI AC-coupled input voltage
HIGH-level input voltage
3
LOW-level input voltage
3
HIGH-level output voltage
4
LOW-level output voltage
4
CKI HIGH-level input current
CKI LOW-level input current
LOW-level input current
3
Input leakage current
2, 3
Input leakage current
2
1.
2.
3.
4.
Symbol
I
DD
V
IH1
V
IL1
V
INAC
V
IH2
V
IL2
V
OH
V
OL
I
IH1
I
IL1
I
IL2
I
LH
I
LL
I
OH
=
−
0.4 mA
I
OL
= 1.6 mA
V
IN
= V
DD
V
IN
= 0 V
V
IN
= 0 V
V
IN
= V
DD
V
IN
= 0 V
Sine wave input
Condition
min
V
DD
= 5.0 V
1
–
0.7V
DD
–
0.3V
DD
2.4
–
2.5
–
–
–
–
–
–
typ
–
–
–
–
–
–
–
–
10
10
10
–
–
max
40
–
0.3V
DD
–
–
0.5
–
0.4
20
20
20
1.0
1.0
mA
V
V
V
p-p
V
V
V
V
µA
µA
µA
µA
µA
Unit
f
SYS
= 384fs = 20 MHz, no output load
Pins CKSL, OFST
Pins LRCI, DIN, BCKI, DSF1, DSF2, WSL1, WSL2, RST
Pins CKO, DOL, DOR, BCKO, WCKO
Low voltage: V
DD
= 3.2 to 4.5 V, V
SS
= 0 V, T
a
=
−
20 to 80
°
C
Rating
Parameter
Current consumption
HIGH-level input voltage
2
LOW-level input voltage
2
CKI AC-coupled input voltage
HIGH-level input voltage
3
LOW-level input voltage
3
HIGH-level output voltage
4
LOW-level output voltage
4
CKI HIGH-level input current
CKI LOW-level input current
LOW-level input current
3
Input leakage current
2, 3
Input leakage current
2
1.
2.
3.
4.
Symbol
I
DD
V
IH1
V
IL1
V
INAC
V
IH2
V
IL2
V
OH
V
OL
I
IH1
I
IL1
I
IL2
I
LH
I
LL
I
OH
=
−
0.2 mA
I
OL
= 0.8 mA
V
IN
= V
DD
V
IN
= 0 V
V
IN
= 0 V
V
IN
= V
DD
V
IN
= 0 V
Sine wave input
Condition
min
V
DD
= 3.4 V
1
–
0.7V
DD
–
0.3V
DD
2.4
–
2.5
–
–
–
–
–
–
typ
–
–
–
–
–
–
–
–
–
–
–
–
–
max
20
–
0.3V
DD
–
–
0.5
–
0.4
12
12
12
1.0
1.0
mA
V
V
V
p-p
V
V
V
V
µA
µA
µA
µA
µA
Unit
f
SYS
= 384fs = 18.5 MHz, no output load
Pins CKSL, OFST
Pins LRCI, DIN, BCKI, DSF1, DSF2, WSL1, WSL2, RST
Pins CKO, DOL, DOR, BCKO, WCKO
NIPPON PRECISION CIRCUITS—5
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