BU9480

Multimedia ICs 16-bit stereo D / A converter for audio applications BU9480F The BU9480F is a 16-bit stereo D / A converter designed for audio applications, and has an internal 2 × oversampling circuit. •ApplicationsD / A converter for audio applications 16-bit stereo •Features operating voltage. 1) 3.0 to 5.5V 2) Low current consumption because of the CMOS process. 3) Resistor strings method used. 4) 2-channel common phase output. 5) Internal 2 × oversampling interpolator. 6) 8 - pin plastic package. 7) Supports 4fs. (200kHz operation) •Block diagram LRCLK 5 BCLK 7 X2 OVER SAMPLING SDATA 6 DAC DAC SHIFT REGISTER / LATCH 8 X2 OVER SAMPLING V CC 3 GND 4 OUTL 2 REF 1 OUTR •Pin descriptions Pin No. 1 2 3 4 5 Pin name ROUT REF GND LOUT LRCK Function Right channel analog signal output Connects the DA ref. voltage pin and ground Ground Left channel analog signal output The signal that distinguishes between left and right channels for serial data (left channe = high level, right channel = low level). Serial data input Input with 2' compliment, MSB first. Serial data shift clock input Vcc I/O Low-impedance output High-impedance input — Low-impedance output Logic input Voltage 1 / 2VCC 1 / 2VCC — 1 / 2VCC — 6 7 8 SDAT BCLK VCC Logic input Logic input — — — — 1 Multimedia ICs BU9480F •Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Power dissipation Operating temperature Storage temperature Input voltage Symbol VDDMax. Pd Topr Tstg Topt Limits 7.0 450∗ – 10 ~ + 70 – 55 ~ + 125 – 0.3 ~ VDD + 0.3 Unit V mW °C °C V ∗ When unmounted, reduced by 4.5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions Parameter Power supply voltage Input low level voltage Input high level voltage Symbol VDD VIL VIH Limits 3.0 ~ 5.5 0.0 ~ 0.2 × VDD 0.8 × VDD ~ VDD Unit V V V characteristics •Electrical characteristics (unless otherwise noted, Ta = 25°C, V Analog unit Parameter Current dissipation Resolution Noise distortion 1 Noise distortion 2 Full-scale output voltage Crosstalk S / N ratio Output pin load resistance Symbol IDD RES THD1 THD2 VFS C.T S/N RL Min. — — — — 1.8 — 86 10 Typ. 3.6 — 0.05 0.07 2 – 92 93 — Max. 6 16 0.12 0.4 2.2 – 85 — — Unit mA BIT % % VP-P dB dB kΩ DD = + 5.0V) Conditions f = 1kHz, 0dB — f = 1kHz, 0dB f = 1kHz, – 20dB — Unmeasured channel output = 0 dB, f = 1kHz. DIN audio filter DIN audio filter — Measurement circuit Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Logic input characteristics Parameter Input high level voltage Input low level voltage Leakage current, high level Leakage current, low level DA conversion frequency BCLK period SDAT.LRCK settling time SDAT.LRCK holding time Symbol VIH VIL IIH IIL fSL TBCLK TST THD Min. 0.7 × VDD GND — — — 60 60 60 Typ. — — — — — — — — Max. VDD 0.3 × VDD – 10 10 200 — — — Unit V V µA µA kHZ ns ns ns Conditions Pins 5,6 and 7 Pins 5,6 and 7 Pins 5,6 and 7 = VDD Pins 5,6 and 7 = GND — — — — Measurement circuit Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 Fig.6,7 2 Multimedia ICs BU9480F •Pin equivalent circuits + – 1, 4 pin 3 pin Fig.1 Fig.4 2 pin Fig.2 Fig.5 8 pin 5, 6, 7 pin Fig.3 •Measurement circuits VCC A 8 7 BU9480F 1 2 3 4 10kΩ 10µF THD + V + 1µF DIGITAL AUDIO DATA 6 5 10kΩ THD V + 1µF Fig. 6 A V Fig. 7 3 •I / O signal timing chart 4 MSB BCLK LSB MSB LSB LSB N Multimedia ICs SDAT 12 13 14 15 16 N L ch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 N–1 LRCK R ch (D (N – 1) + D (N) ) / 2 L OUT D (N – 1) D (N – 2) Interpolation data (D (N – 2) + D (N – 1) ) / 2 R OUT D (N – 2) Interpolation data (D (N – 2) + D (N – 1) ) / 2 D (N – 1) (D (N – 1) + D (N) ) / 2 Note: Interpolation and original data output are timed respectively to the leading edge and leading edge of LRCK, and so LRCK should be set to a duty of 50%. Fig. 8 VIH VIL TST THD SDATA VIH VIL TBCLK VIH VIL VIH VIL TBCLK VIH BLCK THD TST TST THD LRCK VIH VIH VIL VIL BU9480F Multimedia ICs BU9480F •External dimensions (Units: mm) 5.0 ± 0.2 8 6.2 ± 0.3 4.4 ± 0.2 5 1.5 ± 0.1 1 4 0.11 1.27 0.4 ± 0.1 0.3Min. 0.15 SOP8 0.15 ± 0.1 5