For Audio Equipment MN35502 D/A Converter for Digital Audio Equipment Overview Pin Assignment The MN35502 is a CMOS digital-to-analog converter designed especially for PCM digital audio equipment. It features a built-in digital filter with 16/20-bit input. It uses pulse edge modulation (PEM) and JVC advanced noise shaping (VANS) to yield the high resolution and low distortion ratio equivalent to those of 20-bit systems covering the range between 0 and 20 kHz. The chip incorporates an 8-fold oversampling digital filter that eliminates a low-pass filter after the D/A converter and thus greatly reduces the power consumption of the overall D/A conversion system. Use of single-channel 4PEM output yields a D/A converter with a low distortion ratio and high signal-tonoise ratio. The chip makes a major contribution to reducing the cost and size of CD players and other digital audio equipment. DIN 1 28 RSBDN LRCK 2 27 RSBUP BCK 3 26 M3 M4 4 25 DVDD1 DVDD2 5 24 XIN CKO 6 23 XOUT DVSS2 7 22 DVSS1 M1 8 21 M2 OUT1C 9 20 OUT2C OUT1B 10 19 OUT2B AVDD1 11 18 AVDD2 OUT1D 12 17 OUT2D OUT1A 13 16 OUT2A AVSS1 14 15 AVSS2 Features (TOP VIEW) Built-in 20-bit, 8-fold oversampling digital filter SOP028-P-0375 • 2-fold oversampling digital filters with 3-stage cascade configuration Bandwidth ripple: within ±0.0042 dB for 0 to 0.454 fs 8PEM output configuration (4PEM output per channel) Cutoff band attenuation Support for low-voltage (3.3-volt) operation 1±0.454 fs: min. 94.8dB 2±0.454 fs: min. 77.4dB 4±0.454 fs: min. 66.8dB Transition bandwidth 0.469 fs: – 0.12dB Choice of system clocks: 192 fs, 256 f s, 384 fs, 512 f s, 576 fs Choice of input data formats: left-packed, rightpacked, I2 S bus (16 or 20 bits, alternating channel input, MSB first) 0.531 fs: –38dB • Digital filter output: 24 bits (Output after data compression with primary noise shaper) Built-in digital de-emphasis fs=44.1 kHz 0 to 18kHz max. deviation ±0.055dB 18 to 20kHz max. deviation 0.115dB Built-in digital attenuation Up/down over 32 steps Support for double-speed operation (192 fs clock) Applications CD players and other digital audio equipment MN35502 For Audio Equipment Block Diagram DIN LRCK BCK M1 M2 M3 M4 RSBDN RSBUP OUT1C OUT1B OUT1D OUT1A DF Block 1 2 24 OSC Block • De-emphasis IIR Filter I/F Block 23 XIN XOUT • Attenuater • 8fs Over sampling Digital Filter 3 8 6 CKO 21 26 Mode Control Block 1st. Order Noise shaper Block 4 28 VANS Noise shaper Block 27 9 20 10 19 12 PEM Block PEM Block 13 17 16 D/A Block OUT2C OUT2B OUT2D OUT2A For Audio Equipment MN35502 Pin Descriptions Pin No. Pin Name Function Description 1 DIN Serial data pin (MSB first) 2 LRCK 3 BCK 4 M4 5 DVDD2 6 CKO Clock output pin 7 DVSS2 Ground pin for digital circuits 8 M1 9 OUT1C PEM output pin 1C (Left channel with reversed phase) 10 OUT1B PEM output pin 1B (Left channel with same phase) 11 AVDD1 Power supply pin 1 for analog circuits 12 OUT1D PEM output pin 1D (Left channel with reversed phase) 13 OUT1A PEM output pin 1A (Left channel with same phase) 14 AVSS1 Ground pin 1 for analog circuits 15 AVSS2 Ground pin 2 for analog circuits 16 OUT2A PEM output pin 2A (Right channel with same phase) 17 OUT2D PEM output pin 2D (Right channel with reversed phase) 18 AVDD2 Power supply pin 2 for analog circuits 19 OUT2B PEM output pin 2B (Right channel with same phase) 20 OUT2C PEM output pin 2C (Right channel with reversed phase) 21 M2 22 DVSS1 Ground pin 1 for digital circuits 23 XOUT Crystal oscillator pin 24 XIN 25 DVDD1 26 M3 27 28 LR synchronization signal input pin (fs rate) Data shift bit clock input pin Operating mode selection pin 4 (See Table 1.) Power supply pin 2 for digital circuits Operating mode selection pin 1, with pull-up resistor (See Table 1.) Operating mode selection pin 2, with pull-up resistor (See Table 1.) (Ground for oscillator circuit) Crystal oscillator pin (external clock input pin) (Built-in feedback resistor) Power supply pin 1 for digital circuits Operating mode selection pin 3, with pull-up resistor (See Table 1.) RSBUP Reset pin/digital attenuation control pin (See Table 2.) RSBDN Reset pin/digital attenuation control pin (See Table 2.) MN35502 For Audio Equipment Operating Mode Descriptions Table 1. MN35502 Operating Modes Mode Selection Pins Pin States and Operating Modes M1 L L L M4 L H H L L H L H H RSBUP 0 1 2 3 Input data format 4 5 H H L 16 20 60 61 70 71 16 20 16 Left channel 384 192 384 512 CKO output frequency (fs) 384 192 384 512 Available De-emphasis — O — O Not available — O — — H L H L H L H L H 8 9 A B C D E F I2S I2S R XIN clock frequency (fs) Digital attenuation L 16 20 16 20 16 20 16 20 Test Mode Data when LRCK=H H H Right-packed Input word length (bit) H L L L Mode H Rightpacked M3 H Rightpacked Leftpacked Rightpacked Leftpacked Rightpacked M2 H L 384 R L 576 L R 256 32 64 32 L R 384 64 Available O (f s=44.1kHz) VANS oversampling (fs) Theoretical signal-to-noise ratio Output level 64 32 134 107 64 134 128 64 96 64 96 134 150 128 144 (dB) 0.666 × AV DD 0.4995 × AVDD Notes 1: Modes 2 and 3 support fs clock speeds up to 88.2 kHz. 2: Modes A, B, E, and F support fs clock speeds up to 32 kHz; the others, up to 48 kHz. 0.666 × AVDD 0.4995 × AVDD For Audio Equipment MN35502 Functional Descriptions Digital attenuation and reset Table 2 shows how the inputs from the two pins RSBUP and RSBDN control digital attenuation. Table 2. Attenuation Modes Pin Name RSBUP RSBDN Mode Volume L L Reset Mute (–∞) Pin States and Operating Modes ↑↓ L ↑ L ↑ H Mute Normal 0dB H ↑ Attenuation control UP DOWN Notes 1: The upward arrow indicates the rising edge change of the input signal; the paired arrows, the rising and falling edge changes. 2: Always reset the chip after applying the power, restarting the clock, or changing the clock speed. (Wait for the crystal oscillation to stabilize and then apply a reset signal at least eight LRCK clock cycles long.) 3: Digital attenuation is not available for modes with a master clock of 512 fs (modes 60 to 70). There are a total of 32 attenuation levels. According to the attenuation control shown in Table-2, volume goes up or down in one step every input-signal rising-edge. Still, in the 0 dB state, up-pulse does not change the volume. Similary, in the muting state (–∞), downpulse does not change the volume. The change of the input signals is detected by inner clock of 32 fs period, so always use a frequency of 16 fs or less for changes in the RSBUP and RSBDN signals. Do not simultaneously change the RSBUP and RSBDN signals unless setting up for a reset. MN35502 For Audio Equipment Conversion Characteristics DVDD=5.0V, DVSS=0V, AVDD=5.0V, AVSS, f=16.9344MHz, Ta=25˚C Analog Characteristics for 20-bit, 1 fs input Parameter Symbol Test Condition Signal-to-noise ratio Dynamic range Total harmonic min typ max Unit SN EIAJ (kHz) 114 dB D.R. EIAJ (kHz) 113 dB THD+N EIAJ (kHz) 0.0006 1kHz F.S. 2.1 0.0010 % distortion Output level The above analog characteristics are based on measurements with the sample application circuit using mode 4. Vrms For Audio Equipment MN35502 L ch. 180Ω 360Ω 0.022µFG 1.8kΩF 0.0015µF 1.8kΩF 47µF 330pFG + 180Ω + – 0.047µF – 330pFG 13kΩF 180Ω 330pFG 13kΩF 180Ω 330pF + 47µF + – 47µF 13kΩF – 0.047µF 0.047µF + – + + 560ΩF 510ΩF – 1.8kΩF 1.8kΩF 1.8kΩF 1.8kΩF 0.0015µF 0.0015µF 510ΩF 560ΩF – + 1.8kΩF 330pFG 13kΩF 0.047µF 0.047µF 47µF + 18Ω 180Ω OUT IN 0.0015µF 1.8kΩF 0.1µF 0.1µF GND +12V 330pF + 470µF 15 AVSS2 16 OUT2A 1.5µF 17 OUT2D 27kΩF 18 AVDD2 19 OUT2B 27kΩF 20 OUT2C 27kΩF 21 M2 560Ω 22 DVSS1 23 XOUT 1.5µF 24 XIN 25 DVDD1 26 M3 560Ω 27 RSBUP 28 RSBDN (TOP VIEW) 180Ω 180Ω + Xtal 16.9344MHz 100µF GND DVDD 18Ω AVSS1 14 OUT1A 13 OUT1D 12 AVDD1 11 OUT1B 10 OUT1C 9 M1 8 DVSS2 7 CKO 6 DVDD2 5 M4 4 BCK 3 LRCK 2 DIN 1 27kΩF 1.5µF 27kΩF 27kΩF 27kΩF 560Ω 1.5µF 180Ω M1 220µF 470µF 27kΩF + 100Ω + 100Ω M2 10Ω M3 560Ω 11kΩ 560Ω 560Ω 560Ω 78M05 0.047µF AVDD 0.1µF 0.0039µFG 0.047µF 0.047µF 18Ω 47kΩ – + 0.022µFG –12V 0.0039µFG 18Ω 47µF 27kΩ 4.7kΩ 18Ω 0.0056µF 27kΩ + 47µF 0.0056µF + 360Ω 180Ω R ch. Application Circuit Example M4 11kΩ RSBUP RSBDN GND 0.1µF 11kΩ 74HC14A 47µF 0.1µF 0.047µF CK GND DATA LRCK BCK 1 9 100Ω 560Ω 560Ω 560Ω 18Ω 74HC4050 + 100kΩ GND 5V 18Ω + 47µF 100kΩ 0.047µF 11kΩ UP DOWN MN35502 For Audio Equipment Package Dimensions (Unit: mm) SOP028-P-0375 17.80±0.20 15 (0.65) 1.27 0.40±0.10 SEATING PLANE +0.10 9.40±0.30 2.40max. 0.15 -0.05 7.20±0.20 14 0.10±0.10 1 1.10±0.20 2.00±0.20 28 0 to 10° 0.30min.