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 1 24 XOUT BCLK 2 23 COUT SRDATA 3 22 CSEL COT1 4 21 DEMPH COT2 5 20 WVEL TEST 6 19 TP VDD 7 18 PWML Features X2 8 17 RSTB 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 X1 9 16 VDDR VSS 10 15 OUTR VDDL 11 14 VSSR OUTL 12 13 VSSL Applications CD players and other digital audio equipment (TOP VIEW) SOP024-P-0375 MN6475A For Audio Equipment + X1 X2 CSEL COUT XOUT RSTB OUTR – – + 20 PWM Logic (L) 9 8 22 23 24 17 PWM Logic (R) Timing gen. WVEL 15 12 18 OUTL PWML Block Diagram LR selector Noise shaping logic 4 times oversampling Digital filter Digital de-emphasis 6 21 DEMPH 1 LRCLK BCLK 2 S/P converter 3 TEST 19 SRDATA TP For Audio Equipment MN6475A Pin Descriptions Pin No. 1 Symbol LRCLK Function Description LRCLK input pin. "H" level; left channel data input "L" level; right channel data 2 BCLK 3 SRDATA 4 COT 1 Bit clock input pin for serial data Serial data input pin L L Left channel H Right channel H H output only L output only H Stereo output 5 COT2 L 6 TEST 7 VDD Power supply pin for digital circuits (+5V) 8 X2 Crystal oscillator pin LSI test mode pin. Output with channels reversed Keep this pin at "L" level. 9 X1 Crystal oscillator pin (external clock input pin) 10 VSS Ground pin for digital circuits (0V) 11 VDDL Power supply pin for left channel analog circuits (+5V) 12 OUTL Left channel analog signal output pin 13 VSSL Ground pin for left channel analog circuits (0V) 14 VSSR Ground pin for right channel analog circuits (0V) 15 OUTR Right channel analog signal output pin 16 VDDR Power supply pin for right channel digital circuits (+5V) 17 RSTB Reset pin (Active low). Pull this pin low once after applying the power. 18 PWML LSI test output pin. Leave this pin open. 19 TP 20 WVEL 21 DEMPH 22 CSEL Input/Output pin for LSI test mode. Keep this pin at "L" level. Internal operation mode selection pin Digital De-emphasis ON/OFF pin. ON at "H" level. Clock frequency selection pin for COUT pin output. "L" level; 1/4 clock frequency from crystal oscillator or external clock signal "H" level; 1/2 clock frequency 23 COUT Frequency-divided clock output 24 XOUT Output using frequency from crystal oscillator or external clock signal MN6475A For Audio Equipment Conversion Characteristics VDD =5.0V, VSS=0V, f=33.8688MHz, Ta=25˚C Parameter Analog characteristics *1 Signal-to-noise ratio Dynamic range Total harmonic distortion Symbol Test Conditions min typ max Unit 104 dB dB S/N EIAJ 97 D.R. EIAJ 90 THD+N EIAJ 97 0.003 dB 0.006 % Crosstalk EIAJ 84 100 Output level 1 *2 Output level 2 *3 1kHz F.S. 2.0 2.3 2.6 Vrms 1kHz F.S. 1.0 1.2 1.4 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. dB For Audio Equipment MN6475A Application Circuit Example VDDR 100Ω VSS + – + 47µF – 470µF 1000pF A 2.2kΩ 1µF SX SX SX SX SX – + 4.7kΩ 4.7kΩ + 560Ω – 22µF 1200pF 0.001µF B 18kΩ 47kΩ 47kΩ 0.001µF XOUT COUT CSEL DEMPH WVEL TP PWML RSTB VDDR OUTR VSSR VSSL 24 23 22 21 20 19 18 17 16 15 14 13 18kΩ 22µF LRCLK BCLK SRDATA COT1 COT2 TEST VDD X2 X1 VSS VDDL OUTL MN6475A 1000pF 1 2 3 4 5 6 7 8 9 10 11 12 A 2.2kΩ 4.7kΩ 0.001µF – + 4.7kΩ 4.7kΩ + 560Ω – 22µF 1200pF 47kΩ B 18kΩ 18kΩ 5pF 5pF 1µF + – + 470µF – 4.7kΩ – 330µF 0.1µF + – + SX SX SX 47µF – + 100µF 100Ω – + 22µF 220µF VDD VDDL 22µF 47kΩ 0.001µF MN6475A For Audio Equipment Package Dimensions (Unit: mm) SOP024-P-0375 15.30±0.20 13 +0.10 0.15 -0.05 9.40±0.30 1.10±0.20 7.20±0.20 24 0 to 10° 0.30min. 1.27 0.40±0.10 SEATING PLANE 0.10±0.10 (0.67) 2.40max. 12 2.00±0.20 1