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| For Audio Equiment MN6475A D/A Converter for Digital Audio Equipment Overview The MN6475A is a CMOS digital-to-analog converter by noise shaping technology and is designed for PCM digital audio equipment. It features a built-in 4 times oversampling and 16-bit input digital filter. It includes a digital de-emphasis circuit and analog post filter to reduce the parts count and power consumption of the overall D/A conversion system. And also it includes two noise-shaping 1-bit D/A converters, one each for the left and right channels. Pin Assignment LRCLK BCLK SRDATA COT1 COT2 TEST VDD 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 XOUT COUT CSEL DEMPH WVEL TP PWML RSTB VDDR OUTR VSSR VSSL Features Built-in 4 times oversampling digital filter (Bandwidth ripple of 0.051dB and attenuation of 47.99dB dB) Built-in second order analog post filter with a cutoff frequency of 100 kHz Built-in digital de-emphasis circuit with a deviation between +0.47 dB and - 0.07 dB Choice of normal or double-speed playback Built-in overflow limiter No zero cross distortion Sample-and-hold circuit is unnecessary Choice of 768fs or 384f s operation Single 5V power supply X2 X1 VSS VDDL OUTL (TOP VIEW) SOP024-P-0375 Applications CD players and other digital audio equipment MN6475A Block Diagram For Audio Equipment PWML 18 12 + - 15 - OUTR OUTL + WVEL X1 X2 CSEL COUT XOUT RSTB 20 9 8 22 23 24 17 Timing gen. PWM Logic (L) PWM Logic (R) LR selector Noise shaping logic 4 times oversampling Digital filter TP 19 Digital de-emphasis 6 S/P converter 21 DEMPH TEST 3 2 SRDATA BCLK LRCLK 1 For Audio Equipment Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Symbol LRCLK BCLK SRDATA COT 1 COT2 TEST VDD X2 X1 VSS VDDL OUTL VSSL VSSR OUTR VDDR RSTB PWML TP WVEL DEMPH CSEL Function Description LRCLK input pin. "H" level; left channel data input "L" level; right channel data Bit clock input pin for serial data Serial data input pin L Stereo output L LSI test mode pin. Crystal oscillator pin Crystal oscillator pin (external clock input pin) Ground pin for digital circuits (0V) Power supply pin for left channel analog circuits (+5V) Left channel analog signal output pin Ground pin for left channel analog circuits (0V) Ground pin for right channel analog circuits (0V) Right channel analog signal output pin Power supply pin for right channel digital circuits (+5V) Reset pin (Active low). Pull this pin low once after applying the power. LSI test output pin. Leave this pin open. Input/Output pin for LSI test mode. Internal operation mode selection pin Digital De-emphasis ON/OFF pin. ON at "H" level. Clock frequency selection pin for COUT pin output. Keep this pin at "L" level. H L Left channel output only H L Right channel output only H H MN6475A Output with channels reversed Keep this pin at "L" level. Power supply pin for digital circuits (+5V) "L" level; 1/4 clock frequency from crystal oscillator or external clock signal "H" level; 1/2 clock frequency 23 24 COUT XOUT Frequency-divided clock output Output using frequency from crystal oscillator or external clock signal MN6475A Conversion Characteristics VDD =5.0V, VSS=0V, f=33.8688MHz, Ta=25C For Audio Equipment Parameter Analog characteristics *1 Signal-to-noise ratio Dynamic range Total harmonic distortion Crosstalk Output level 1 *2 Output level 2 *3 Symbol S/N D.R. THD+N Test Conditions EIAJ EIAJ EIAJ EIAJ 1kHz F.S. 1kHz F.S. min 97 90 84 2.0 1.0 typ 104 97 0.003 100 2.3 1.2 max dB 0.006 2.6 1.4 Unit dB dB % dB Vrms Vrms Notes *1: These analog characteristics are based on measurements in the application circuit example next page. *2: This level is measured at point B in that circuit. *3: This level is measured at point A (LSI output pin) in that circuit. For Audio Equipment Application Circuit Example MN6475A VDDR VSS 100 + 47F - 470F + A 2.2k 0.001F - + 4.7k 4.7k 1000pF B 560 18k 22F 47k 0.001F 1F SX SX SX SX SX 1200pF 47k 18k LRCLK BCLK SRDATA COT1 COT2 TEST VDD X2 X1 VSS VDDL OUTL XOUT COUT CSEL DEMPH WVEL TP PWML RSTB VDDR OUTR VSSR VSSL 24 23 22 21 20 19 18 17 16 15 14 13 MN6475A A 2.2k 0.001F - + 1000pF 4.7k 4.7k - 22F 1200pF 47k + 560 18k 18k 22F 1 2 3 4 5 6 7 8 9 10 11 12 4.7k SX SX SX 5pF 5pF + 1F - + 330F 0.1F + 4.7k - 100F + - 22F + - 220F 470F + - 47F 100 VDD VDDL - 22F + - B 47k 0.001F - MN6475A Package Dimensions (Unit: mm) SOP024-P-0375 For Audio Equipment 15.300.20 24 13 1.100.20 7.200.20 9.400.30 0.15 -0.05 +0.10 0 to 10 0.30min. 1 12 2.40max. 2.000.20 (0.67) 1.27 0.400.10 SEATING PLANE 0.100.10 |
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