NPC SM6451AV Datasheet
SM6451AV
NIPPON PRECISION CIRCUITS INC.
OVERVIEW
The SM6451AV is a 3-wire serial-controlled electronic variable volume IC for audio applications. It
provides electronic volume control for a stereo system (left and right channels), and independent channel attenuation and muting, with greatly enhanced
digital zip noise suppression. The chip address function allows up to four SM6451AV devices to be connected and individually controlled over the 3-wire
control interface from a single CPU. It is available in
16-pin VSOP packages.
FEATURES
■
Stereo inputs and outputs
■
Attenuation function
• 2-channel independent control
• 1.0 dB/step over 80 steps
• 0 to − 80 dB range
■
Mute function
■
3-wire serial data control (MDT, MCK, MLEN)
■
Chip addressing (up to 4 devices can be connected
in parallel)
■
Low noise
• ≤ 0.002% THD + noise
• 10 µVrms residual noise
■
5 V single power supply
■
Silicon-gate CMOS process
APPLICATIONS
Audio Variable Volume IC
PINOUT
(T op V iew)
RSTN
1
ADRS1
ADRS2
DVDD
LOUT
LIN
AVDD
8
VRL VRR
PACKAGE DIMENSIONS
(Unit: mm)
16 pin VSOP
4.4 0.2
6.4 0.2
16
6451AV
MDT
MCK
MLEN
DVSS
ROUT
RIN
AVSS
9
■
Audio equipment
ORDERING INFORMATION
Device Package
SM6451AV 16-pin VSOP
0.65
0.275TYP
5.1 0.2
0.10
+ 0.10
0.22
- 0.05
M
0.12
0.10 0.05
NIPPON PRECISION CIRCUITS—1
1.15 0.1
0.5 0.2
0.15
+ 0.1
- 0.05
010
BLOCK DIAGRAM
SM6451AV
DVDD DVSS
LIN
Attenuation
Control
1/2VDD
MLEN
MCK
MDT
Attenuation Decoder
Interface Control
Circuits
RSTN
Decoder
Address
ADRS1
Chip
ADRS2
1/2VDD
RIN
Attenuation
Control
AVDD AVSS
PIN DESCRIPTION
Number Name I/O
1 RSTN Ip D System reset input (LOW-level reset)
2 ADRS1 Ip D Chip address set 1
3 ADRS2 Ip D Chip address set 2
4 DVDD – D Digital supply
5 LOUT O A Left-channel audio output
6 LIN I A Left-channel audio input
7 AVDD – A Analog supply
8 VRL O A
9 VRR O A
10 AVSS – A Analog ground
11 RIN I A Right-channel audio input
12 ROUT O A Right-channel audio output
13 DVSS – D Digital ground
14 MLEN Ip D Microcontroller latch enable input
15 MCK Ip D Microcontroller clock input
16 MDT Ip D Microcontroller data input
1. Ip = input pin with pull-up, A = analog, D= digital
1
A/D
1
Left-channel reference voltage (0.5V
between VRL and AVSS.
Right-channel reference voltage (0.5V
between VRR and AVSS.
Reference
Voltage
LOUT
VRL
VRR
ROUT
Description
). Connect a 10 µF capacitor
DD
). Connect a 10 µF capacitor
DD
NIPPON PRECISION CIRCUITS—2
−
−
SPECIFICATIONS
Absolute Maximum Ratings
−
SM6451AV
DVSS = AVSS = 0 V, DVDD = AVDD = V
DD
Parameter Symbol Rating Unit
Supply voltage V
Input voltage V
Power dissipation P
Storage temperature T
Soldering temperature T
Soldering time t
Recommended Operating Conditions
DVSS = AVSS = 0 V, DVDD = AVDD = V
Parameter Symbol Rating Unit
Supply voltage V
Supply voltage deviation DV
Operating temperature T
DD
DD
− AV
DC Characteristics
DD
IN
D
stg
sld
sld
DD
, DV
− AV
DD
SS
SS
opr
0.3 to 7.0 V
V
− 0.3 to V
SS
+ 0.3 V
DD
150 mW
55 to 125
255
10 s
4.5 to 5.5 V
±0.1 V
40 to 85
° C
° C
° C
DVDD = AVDD = V
= 4.5 to 5.5 V, V
DD
Parameter Symbol Condition
Data transfer stopped, MDT, MCK,
MLEN, RSTN, ADRS1, ADRS2 = V
ADRS1 = ADRS2 = 0V, 1.2 Vrms analog
input, ATT = 0 dB, data transfer active
IH
IL
I
V
IL
I
IH
IN
V
IN
DVDD Current consumption
AVDD Current consumption I
HIGH-level input voltage
LOW-level input voltage
Input current
1
Input leakage current
1
1
1
I
DDD1
I
DDD2
DDA
V
V
1. MDT, MCK, MLEN, RSTN, ADRS1, ADRS2
= 0 V, Ta = − 40 to 85 ° C
SS
Rating
Unit
min typ max
DD
– 0.3 1.0 µA
–12mA
– 4.5 8 mA
0.7V
DD
– – 0.3V
––V
DD
= 0 V – 230 400 µA
= V
DD
– – 1.0 µA
V
NIPPON PRECISION CIRCUITS—3
AC Digital Characteristics
SM6451AV
DVDD = AVDD = V
= 4.5 to 5.5 V, V
DD
= 0 V, Ta = − 40 to 85 ° C
SS
Serial inputs (MDT, MCK, MLEN)
Parameter Symbol
MCK, MLEN rise time t
MCK, MLEN fall time t
MDT setup time t
MDT hold time t
MLEN setup time t
MLEN hold time t
MLEN LOW-level pulsewidth t
MLEN HIGH-level pulsewidth t
MDT
tMDS
tMDH
r
f
MDS
MDH
MCS
MCH
MEWL
MEWH
Rating
Unit
min typ max
– – 100 ns
– – 100 ns
50 – – ns
50 – – ns
50 – – ns
50 – – ns
50 – – ns
50 – – ns
0.5VDD
MCK
tMCS
tMEWL
tf tr
MCK
MLEN
0.9VDD
0.1VDD
Reset input (RSTN)
Parameter Symbol
RSTN LOW-level pulsewidth t
RSTN
tMCH
tMEWH
0.5VDD
0.5VDDMLEN
0.9VDD
0.1VDD
Rating
min typ max
100 – – ns
0.5VDD
Unit
NIPPON PRECISION CIRCUITS—4
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