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SM6452AM/BM
NIPPON PRECISION CIRCUITS INC.
Audio Variable Volume ICs
OVERVIEW
The SM6452AM/BM are serial-control electronic variable volume ICs for audio applications. They provide electronic volume control for 6 channels, with independent channel gain, attenuation and muting. They feature enhanced digital zip noise suppression. The serial control options are 3-wire interface (SM6452AM) and I2C bus (SM6452BM). The SM6452AM/BM are available in 24-pin SSOP packages.
FEATURES
s
PINOUT
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AVDD1 VREF1 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6
1
s
s
s
s s
s
s
6-channel input/output (positive-phase-sequence output) Attenuation function * 6-channel independent control * +16 to 0 to -79dB variable range * 1.0 dB/step adjustment * Mute function Microcontroller interface * 3-wire serial data interface (SM6452AM) * I2C bus format 2-wire control (SM6452BM)*1 * I2C address = 1000000 Low noise * 0.002% THD + noise * 10Vrms residual noise 0.5AVDD analog reference voltage source built-in Power supply * 7 to 13V analog supply * 2.7 to 5.5V digital supply Molybdenum-gate CMOS process 24-pin SSOP
SM6452AM
ORDERING INFORMATION
D e vice
SM6452BM
P ackag e
SM6452AM SM6452BM
24-pin SSOP 24-pin SSOP
*1. I2C bus is a registered trademark of Philips Electronics N.V.
NIPPON PRECISION CIRCUITS--1
ry
Top view 24
AVDD2 VREF2 AOUT1 AOUT2 AOUT3 AOUT4 AOUT5 AOUT6 AVSS2 DVSS MCK MLEN
S M 6 4 5 2 AM
AVSS1 MDT
DVDD RSTN
12
13
Top view
AVDD1 VREF1 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6
1
24
AVDD2 VREF2 AOUT1 AOUT2 AOUT3 AOUT4 AOUT5 AOUT6 AVSS2 DVSS SCL NC
S M 6 4 5 2 BM
AVSS1 SDA
DVDD RSTN
12
13
SM6452AM/BM
PACKAGE DIMENSIONS
Unit: mm
10.05 0.20 10.20 0.30
0.10 0.10
+0.20 1.90-0.10
0.8
0.36 0.10 0.10
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AVDD1 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 ATT Control ATT Control ATT Control ATT Control ATT Control ATT Control Gain/ATT Decoder VREF1 Interface Control AVSS1 DVDD RSTN MDT(AM)/SDA(BM) MCK(AM)/SCL(BM) MLEN(AM)/NC(BM)
BLOCK DIAGRAM
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5.40 0.20 7.80 0.30
0.15 - 0.05
+ 0.1
1.80
0.12 M
0.50 0.20
0 10
AVDD2
Gain/ATT Control Gain/ATT Control Gain/ATT Control Gain/ATT Control Gain/ATT Control Gain/ATT Control
AOUT1 AOUT2 AOUT3 AOUT4 AOUT5 AOUT6
VREF2 AVSS2 DVSS
NIPPON PRECISION CIRCUITS--2
SM6452AM/BM
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 S D A (BM) 12 13 NC (BM) MCK (AM) 14 SCL (BM) 15 16 17 18 19 20 21 22 23 24 DV S S I - - I RSTN MLEN (AM) I/O Ip Ip Name AV D D 1 VREF1 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AV S S 1 DV D D MDT (AM) I/O 1 - O I I I I I I - - I A/D2 A A A A A A A A Analog supply 1 Reference voltage source capacitor connection (0.5AV D D 1 ) Channel 1 audio input Channel 2 audio input Channel 3 audio input Channel 4 audio input Channel 5 audio input Channel 6 audio input Description
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1. Ip = input pin with pull-up 2. A = analog, D= digital NIPPON PRECISION CIRCUITS--3
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AV S S 2 - A AOUT6 AOUT5 AOUT4 AOUT3 AOUT2 AOUT1 VREF2 O O O O O O A A A A A A A O - AV D D 2 A
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A Analog ground 1 Digital supply D D Microcontroller data input D I2 C bus serial data input and acknowledge (ACK) signal output D System reset input (active LOW -level) Microcontroller latch enable input D - No connection D Microcontroller clock input I2 C bus clock input D D Digital ground Analog ground 2 Channel 6 audio output Channel 5 audio output Channel 4 audio output Channel 3 audio output Channel 2 audio output Channel 1 audio output Reference voltage source capacitor connection (0.5AV D D 2 ) Analog supply 2
SM6452AM/BM
SPECIFICATIONS
Absolute Maximum Ratings
AVSS1 = AVSS2 = DVSS = 0V, AVDD1 = AVDD2 = AVDD, DVDD = DVDD
P arameter Analog supply voltage Digital supply voltage Analog input voltage Digital input voltage I2 C bus signal input voltage (SDA, SCL) Symbol AV D D Rating 1 -0.3 to 15.0 -0.3 to 7.0 Unit V V V
Storage temperature range Pow er dissipation 1. Ratings also apply at supply switch ON and OFF.
Recommended Operating Conditions
AVSS1 = AVSS2 = DVSS = 0V
P arameter Analog supply voltage Digital supply voltage Supply voltage deviation Operating temperature
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T opr
AV D D 1 - AV D D 2 , AV S S 1 - AV S S 2 , AV S S 1 - DV S S , AV S S 2 - DV S S
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NIPPON PRECISION CIRCUITS--4
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DV D D V INA V S S - 0.3 to AV D D + 0.3 V IND V S S - 0.3 to DV D D + 0.3 10 V IOPEN T stg PD -55 to 125 TBD Symbol AV D D Rating 7.0 to 13.0 2.7 to 5.5 0.1 -40 to 85 DV D D
V V
C
mW
Unit V V
V C
SM6452AM/BM
DC Characteristics (SM6452AM)
AVDD = 7 to 13V, DVDD = 2.7 to 5.5V, VSS = 0V, Ta = -40 to 85C
Rating P arameter Symbol Condition min ID D D 1 ID D D 2 AVDD1, AVDD2 current consumption M D T, MCK, MLEN, RSTN HIGH-level input voltage M D T, MCK, MLEN, RSTN LOW -level input voltage RSTN, MLEN input current M D T, MCK input leakage current RSTN, MLEN input leakage current ID D A V IH V IL IIL1 IL L 1 IL H 1 IL H 2 Data transfer stopped, MDT = MCK = M L E N = R S T N = DV D D = 5V Data transfer in progress, DV D D = 5V - typ TBD max TBD A Unit
DVDD current consumption
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- TBD TBD - TBD - TBD - 0.7DV D D - - 0.3DV D D TBD V IN = 0V V IN = 0V - TBD - - TBD V IN = DV D D V IN = DV D D - - - - TBD TBD Rating typ TBD TBD TBD - - TBD TBD - - - - Condition min - - - 0.7DV D D - - - - - - TBD max TBD TBD TBD - 0.3DV D D TBD TBD TBD TBD TBD TBD Data transfer stopped, S D A = SCL = RSTN = DV D D Data transfer in progress V IN = 0V V IN = 0V V IN = DV D D V IN = DV D D V IN = 10V A CK signal output, 3mA input current
mA mA V V
A
A A A
DC Characteristics (SM6452BM)
AVDD = 7 to 13V, DVDD = 2.7 to 5.5V, VSS = 0V, Ta = -40 to 85C
P arameter Symbol
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ID D D 1 ID D D 2 ID D A V IH V IL IIL1 IIL2 IL H 1 IL H 2 IL H 3 VOL
Unit
A mA mA V V A A A A A V
DVDD current consumption
AVDD1, AVDD2 current consumption S D A, SCL, RSTN HIGH-level input voltage S D A, SCL, RSTN LOW -level input voltage RSTN input current
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RSTN input leakage current S D A, SCL input leakage current S D A L OW -level output voltage
S D A, SCL input current
NIPPON PRECISION CIRCUITS--5
SM6452AM/BM
AC Digital Characteristics (SM6452AM)
AVDD = 7 to 13V, DVDD = 2.7 to 5.5V, VSS = 0V, Ta = -40 to 85C Serial inputs (MDT, MCK, MLEN)
Rating P arameter M C K , M L E N r ise time MCK, MLEN fall time MDT setup time MDT hold time MLEN setup time MLEN hold time M L E N L OW -level pulsewidth MLEN HIGH-level pulsewidth Symbol min - - typ - - max 100 100 - - - - - - tr tf Unit ns ns
MDT tMDS MCK
MLEN
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tMCS tMEWL
P arameter Symbol tR S T N
Reset input (RSTN)
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R S T N L OW -level pulsewidth
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tM D S 50 50 50 50 50 50 - - - - - - tM D H tM C S tM C H tM E W L tM E W H
ns ns ns ns ns ns
0.5DVDD
tMDH
0.5DVDD
tMCH 0.5DVDD
tMEWH
Rating Unit min 100 typ - max - ns
NIPPON PRECISION CIRCUITS--6
SM6452AM/BM
AC Digital Characteristics (SM6452BM)
AVDD = 7 to 13V, DVDD = 2.7 to 5.5V, VSS = 0V, Ta = -40 to 85C Serial inputs (SDA, SCL)
Rating P arameter SCL hold time (start) SCL setup time (stop) S D A hold time S D A setup time SCL clock HIGH-level pulsewidth SCL clock LOW -level pulsewidth SCL rise time SCL fall time Symbol min 4.0 4.0 5.0 typ - - - max - - - tH D : S TA tS U : S TA Unit s s s ns
SDA tHD:STA SCL tSU:DAT
Reset input (RSTN)
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tHIGH
P arameter Symbol tR S T N
R S T N L OW -level pulsewidth
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tH D : DAT tS U : DAT tH I G H tL O W tr tf 250 4.0 4.7 - - - - - - - - - - 1000 300
s s ns
ns
tHD:DAT
tHD:STO
tLOW
Rating Unit min 100 typ - max - ns
SM6452AM/BM
AC Analog Characteristics
AVDD = 9V, DVDD = 5V, (TBD)Vrms analog input amplitude, 1kHz analog input frequency, 100k output load resistance, Ta = 25C, AC-coupled inputs Analog inputs (AIN1 to AIN6)
Rating
Reference input amplitude Input resistance 1
V AI R IN VCLP
Input clipping voltage
1. R IN varies with the ATT setting. See figure 11 in the Analog Performance Characteristics section.
Analog outputs (AOUT1 to AOUT6)
P arameter Residual noise voltage Signal-to-noise ratio Total harmonic distortion + noise Gain control range Step size
Symbol VNS SNR THD + N RCNT Step
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ERR1 ERR2 AT 0 AT 1 AT 2 +16 to -6 0 d B -61 to -7 9 d B ATT = 16dB ATT = 0dB ATT = -2 0 d B ATT = -4 0 d B ATT = -6 0 d B ATT = -7 9 d B ATT = Mute AT 3 AT 4 AT 5 Mute CT ATT = 0dB ATT = 0dB, f = 200kHz 0Vr ms input signal ATT = 0dB, THD + N = 1% FR NJ voltage 2 RML Symbol VREF Condition
Attenuation error (1 to 20kHz)
Absolute attenuation (1kHz)
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Channel crosstalk 1 Frequency response Quiescent output zip noise Minimum driver load resistance
Mute attenuation (1kHz)
1. Leakage to other channels when analog input is applied to one channel only. 2. Noise occurring when the ATT setting is changed (peak to peak)
Reference voltage (VREF1, VREF2)
P arameter
Reference voltage output
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min - typ max - TBD ATT = 0dB TBD - TBD TBD - THD + N = 1%, ATT = 0dB TBD Rating typ Condition min - max Input signal: 0Vrm s , A - weight filter, 0dBr = (TBD)Vr m s , ATT = 0dB TBD TBD - TBD - TBD ATT = 0dB, 20kHz lowpass filter TBD - TBD +16 1.5 TBD TBD - - - - - - - - - TBD - -7 9 0.8 TBD TBD - - - - - - TBD TBD - - TBD 1.0 - - TBD TBD TBD TBD TBD TBD TBD TBD TBD - TBD Rating min 0.45AV D D typ 0.5AV D D max 0.55AV D D
P arameter
Symbol
Condition
Unit
Vr m s
Vr m s
Unit
Vr m s dBr %
dB dB dB dB dB
dB dB dB dB dB dB dB dB mVp-p
Unit V
NIPPON PRECISION CIRCUITS--8
SM6452AM/BM
MEASUREMENT CIRCUIT
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TBD
SM6452AM/BM
MICROCONTROLLER INTERFACE
SM6452AM
Transfer format The SM6452AM uses a 3-wire serial interface to select channels and set attenuation levels. The transfer format is shown in figure 1.
MDT
D15 D14 D13 D12 D11 D10 D9
MCK
MLEN
Figure 1. Microcontroller input data timing
Data description (D15 to D0)
In the following description, LOW implies VIL level and HIGH implies VIH level.
s
s
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D15, D14 Don't care. D13 to D8 Chip address bits. Each of 6 channels is set when the corresponding bit is set HIGH. * D13: channel 1 * D12: channel 2 * D11: channel 3 * D10: channel 4 * D9: channel 5 * D8: channel 6 D7 to D0 Gain/attenuation set bits. The gain/attenuation setting for ATT register settings are shown in table 1.
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Data is shifted into the internal shift register on the rising edge of MCK, and the attenuation value is loaded and changed on the rising edge of MLEN. Accordingly, data on MDT should be changed on the falling edge of MCK. The dotted lines for MCK and MLEN also indicate valid timing.
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Attenuation Data 6 Attenuation Data 5 Attenuation Data 4 Attenuation Data 3 Attenuation Data 2 Attenuation Data 1
D8
D7
D6
D5
D4
D3
D2
D1
NIPPON PRECISION CIRCUITS--10
Attenuation Data 0
Channel 2
Channel3
Channel4
Channel5
Channel1
Channel6
Don't Care
Don't Care
Don't Care
D0
SM6452AM/BM
SM6452BM
Transfer format The SM6452BM uses Philips I2C interface to select channels and set attenuation levels. For details of the I2C bus, refer to Philips "I2C Bus Specification Description". Here, we describe only the aspects for controlling the SM6452BM. The transfer format is shown in figure 2.
AD6 to AD0 = 1000000 First Byte (Slave address) SDA AD6 AD0 L ACK
SCL Start condition
Figure 2. Microcontroller input data timing
As shown in figure 2, the data format comprises 3 bytes. After the SM6452BM receives 8 bits for each byte, an acknowledge signal (ACK) on SDA goes LOW to confirm the data transfer. Data format
s
s
Data description (D15 to D0)
s
s
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D15, D14 Don't care. D13 to D8 Chip address bits. Each of 6 channels is set when the corresponding bit is set HIGH. * D13: channel 1 * D12: channel 2 * D11: channel 3 * D10: channel 4 * D9: channel 5 * D8: channel 6 D7 to D0 Gain/attenuation set bits. The gain/attenuation setting for ATT register settings are shown in table 1.
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Byte 1 (slave address) The first byte is slave address. The SM6452BM address (AD6 to AD0) is 1000000. The 8th bit indicates information write and should be set LOW. Bytes 2 and 3 Bytes 2 and 3 are the channel select and gain/attenuation level set bits. Byte 2 represents data bits D15 to D8, and byte 3 represents data bits D7 to D0.
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Second Byte Third Byte D15 D8 ACK D7 D0 ACK
Stop condition
NIPPON PRECISION CIRCUITS--11
SM6452AM/BM Attenuation settings
Table 1. ATT settings
Attenuation 1 16dB 15dB 1dB 0dB -1 d B -1 5 d B -1 6 d B -1 7 d B -7 8 d B -7 9 d B Mute Mute AT T H 00 01 0F 10 11 1F 20 21 5E 5F 6x 7x D7 x x x x x x x x x x x x D6 LOW LOW D5 LOW LOW D4 LOW LOW D3 LOW LOW D2 LOW LOW D1 LOW LOW D0 LOW HIGH
LOW LOW LOW
LOW LOW LOW
HIGH HIGH HIGH HIGH
1. Outputs are muted after system reset. The ATT hex code is determined by D6 to D0 only.
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NIPPON PRECISION CIRCUITS--12
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LOW LOW LOW LOW HIGH LOW LOW HIGH LOW LOW HIGH LOW LOW HIGH HIGH LOW HIGH LOW LOW HIGH LOW LOW HIGH LOW LOW HIGH LOW LOW HIGH HIGH LOW LOW HIGH HIGH LOW HIGH HIGH x x HIGH HIGH x x HIGH HIGH x x HIGH HIGH HIGH
HIGH LOW
HIGH
HIGH LOW
HIGH
LOW
HIGH x x
SM6452AM/BM
ANALOG PERFORMANCE CHARACTERISTICS
AVDD = 9V, DVDD = 5V, 100k output load resistance, Ta = 25C
TBD
Figure 3. THD + N vs. input amplitude
Figure 5. Gain/attenuation error
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TBD
TBD
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Figure 7. Frequency response
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TBD
Figure 4. THD + N vs. frequency
TBD
Figure 6. Residual noise vs. ATT
TBD
Figure 8. Crosstalk frequency response
NIPPON PRECISION CIRCUITS--13
SM6452AM/BM
Figure 9. FFT spectrum
TBD
Figure 11. Input resistance vs. ATT
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TBD
Figure 13. Current consumption vs. temperature
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Figure 10. THD + N vs. load resistance
TBD
TBD
TBD
Figure 12. Current consumption vs. supply voltage
NIPPON PRECISION CIRCUITS--14
SM6452AM/BM
TYPICAL APPLICATIONS
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TBD
SM6452AM/BM
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698
NP9917BE 2000.1
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NIPPON PRECISION CIRCUITS INC.
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NIPPON PRECISION CIRCUITS--16
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