PDF SM6452BM Data sheet ( Hoja de datos )

Número de pieza	SM6452BM
Descripción	Audio Variable Volume ICs
Fabricantes	Nippon Precision Circuits Inc
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No Preview Available ! NIPPON PRECISION CIRCUITS INC. SM6452AM/BM 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 6-channel input/output (positive-phase-sequence output) s Attenuation function • 6-channel independent control • +16 to 0 to −79dB variable range • 1.0 dB/step adjustment • Mute function s Microcontroller interface • 3-wire serial data interface (SM6452AM) • I2C bus format 2-wire control (SM6452BM)1 • I2C address = 1000000 s Low noise • ≤ 0.002% THD + noise • ≤ 10µVrms residual noise s 0.5AVDD analog reference voltage source built-in s Power supply • 7 to 13V analog supply • 2.7 to 5.5V digital supply s Molybdenum-gate CMOS process s 24-pin SSOP ORDERING INFORMATION Device SM6452AM SM6452BM Package 24-pin SSOP 24-pin SSOP 1. I2C bus is a registered trademark of Philips Electronics N.V. PINOUT SM6452AM Top view AVDD1 VREF1 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AVSS1 DVDD MDT RSTN 1 12 24 AVDD2 VREF2 AOUT1 AOUT2 AOUT3 AOUT4 AOUT5 AOUT6 AVSS2 DVSS MCK 13 MLEN SM6452BM Top view AVDD1 VREF1 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AVSS1 DVDD SDA RSTN 1 12 24 AVDD2 VREF2 AOUT1 AOUT2 AOUT3 AOUT4 AOUT5 AOUT6 AVSS2 DVSS SCL 13 NC NIPPON PRECISION CIRCUITS—1 1 page SM6452AM/BM DC Characteristics (SM6452AM) AVDD = 7 to 13V, DVDD = 2.7 to 5.5V, VSS = 0V, Ta = −40 to 85°C Parameter DVDD current consumption 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 MDT, MCK input leakage current RSTN, MLEN input leakage current Symbol Condition ID D D 1 ID D D 2 ID D A V IH Data transfer stopped, MDT = MCK = MLEN = RSTN = DVDD = 5V Data transfer in progress, DV D D = 5V min – – – 0.7DV DD Rating typ TBD TBD TBD – max TBD TBD TBD – V IL IIL1 V IN = 0V ILL1 V IN = 0V IL H 1 V IN = DV D D ILH2 V IN = DV D D – – 0.3DV DD – TBD TBD – – TBD – – TBD – – TBD DC Characteristics (SM6452BM) AVDD = 7 to 13V, DVDD = 2.7 to 5.5V, VSS = 0V, Ta = −40 to 85°C Parameter DVDD current consumption AVDD1, AVDD2 current consumption S DA, SCL, RSTN HIGH-level input voltage S DA, SCL, RSTN LOW -level input voltage RSTN input current SDA, SCL input current RSTN input leakage current SDA, SCL input leakage current S DA LOW -level output voltage Symbol Condition ID D D 1 ID D D 2 ID D A V IH Data transfer stopped, S DA = SCL = RSTN = DV DD Data transfer in progress Rating min typ – TBD – TBD – TBD 0.7DV DD – max TBD TBD TBD – V IL IIL1 V IN = 0V IIL2 V IN = 0V IL H 1 V IN = DV D D IL H 2 V IN = DV D D ILH3 V IN = 10V VOL ACK signal output, 3mA input current – – – – – – TBD – 0.3DV DD TBD TBD TBD TBD – TBD – TBD – TBD – TBD Unit µA mA mA V V µA µA µA µA Unit µA mA mA V V µA µA µA µA µA V NIPPON PRECISION CIRCUITS—5 5 Page 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) Second Byte Third Byte SDA AD6 AD0 L ACK D15 D8 ACK D7 D0 ACK SCL Start condition Stop 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 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. s 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. Data description (D15 to D0) s D15, D14 Don’t care. s 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 s D7 to D0 Gain/attenuation set bits. The gain/attenuation setting for ATT register settings are shown in table 1. NIPPON PRECISION CIRCUITS—11 11 Page

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