FN1241 Audio D/A Converter Specification Data Sheet
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1 FN1241 Audio D/A Converter Specification Data Sheet Ver Niigata Seimitsu Co., Ltd
2 FN1241 Product Overview: FN1241 is digital audio 2CH-1 bit D/A converter IC that has fluency type data compensation filter built-in. DAC part adopted newly developed high stability wide range swing suppression method. It reproduces wide range output signals generated by the compensation filter. Analog output is four-value differential PWM output. Addition of external differential circuit brings high quality audio signals. Features: By using 8 times oversampling Fluency digital filter, 16 bit input is converted to 24 bit by interpolation. High performance 1 bit DAC 16 times oversampling interpolation filter Bandwidth: 40 khz Note : The above figures are given when master clock SCLK = 512 fs and sampling frequency = 44.1 khz. Sampling Frequency: supports sampling frequencies of 32 khz, 44.1 khz, and 48 khz Audio data format: MSB first right-justified, MSB first left-justified, IIS (available for 16, 20, and 24 bit interface) Master clock frequency: 512 fs, 384 fs. Digital de-emphasis filter for sampling frequencies of 32 khz, 44.1 khz and 48 khz. Single 3.3 V power supply: available for 3.3 V CMOS interface and 5 V TTL interface Applications: The FN1241 is suitable for use in middle-class or high-class digital audio equipment, which demands good sound quality, such as CD players for use in a car or at home, digital TV, and set top box
3 Block diagram: SERIAL INTERFACE DE- EMPHASIS DE- EMPHASIS FLUENCY 8X Fs DIGITAL FILTER FLUENCY 8X Fs DIGITAL FILTER MODULATOR MODULATOR CLOCK / MODE CONTOROLLER Package: 48 pin QFP (0.8mm pitch - 3 -
4 Pin Function Descriptions: Pin Pin Name I/O Description 1 AVSSL - Left Channel Analog Ground 2 NNOL O Left Channel Analog Audio Output (- / -) 3 AVDDL - Left Channel Analog Power Supply (3.3V) 4 PNOL O Left Channel Analog Audio Output (- / +) 5 AVSSL - Left Channel Analog Ground 6 NPOL O Left Channel Analog Audio Output (+ / -) 7 AVDDL - Left Channel Analog Power Supply (3.3V) 8 PPOL O Left Channel Analog Audio Output (+ / +) 9 DVSS - Digital Ground 10 DVDD - Digital Power Supply (3.3V) 11 TEST I Test Pin. Connect to DVSS. 12 TEST I Test Pin. Connect to DVSS. 13 TEST I Test Pin. Connect to DVSS. 14 TEST I Test Pin. Connect to DVSS. 15 TEST I Test Pin. Connect to DVSS. 16 RSV - Leave this pin open. 17 RSV - Leave this pin open. 18 RSV - Leave this pin open. 19 RSV - Leave this pin open. 20 RSV - Leave this pin open. 21 DVDD - Digital Power Supply (3.3V) DVSS EMP0 - I Digital Ground De-emphasis Filter Select. (EMP1, EMP0) 24 EMP1 I = 00 : OFF (no de-emphasis) = 01 : 48KHz = 10 : 44.1KHz 25 IFF0 I = 11 : 32KHz Input Data Format Select. (IFF2,IFF1,IFF0) 26 IFF1 I = 000 :16bitMSB first right-justified = 001 :20bitMSB first right-justified = 010 :24bitMSB first right-justified 27 IFF2 I = 100 :16,20,24bitISS format = 101 : - = 110 :16,20,24bitMSB first left-justified CKFRQ BCLK I I Master Clock Frequency Select: 384fs at LOW and 512fs at HIGH Serial Data Clock Input. 64FS or 32FS when SCLK = 512FS 64FS, 48FS or 32FS when SCLK = 384FS 30 RESN I Reset input. Low active. 31 SDI I Serial Audio Data Input 32 LRCLK I Left/Right Clock Input 33 RSV - Leave this pin open. 34 DVSS - Digital Ground 35 DVSS - Digital Ground 36 DVDD - Digital Power Supply (3.3V 37 DVSS - Digital Ground 38 PPOR O Right Channel Analog Audio Output (+ / +) 39 AVDDR - Right Channel Analog Power Supply (3.3V) 40 NPOR O Right Channel Analog Audio Output ( + / ) 41 AVSSR - Right Channel Analog Ground 42 PNOR O Right Channel Analog Audio Output ( / +) - 4 -
5 43 AVDDR - Right Channel Analog Power Supply (3.3V) 44 NNOR O Right Channel Analog Audio Output ( / ) 45 AVSSR - Right Channel Analog Ground 46 AVDDCK - Power Supply (3.3V) 47 SCLK I System Clock Input. This pin inputs 384fs when CLFRQ=LOW, and 512fs when CLKFRQ=HIGH. 48 AVSSCK - System Clock Ground Electrical Characteristics: Absolute maximum ratings* (Ta = 25, Vss = 0 V) Parameter Symbol Rating Unit Supply voltage VDD V Input voltage VI -0.3 VDD+ 0.3 V Output voltage VO -0.3 VDD+ 0.3 V Storage temperature Tstg Note*: Permanent device damage may occur if the above absolute maximum ratings are exceeded. Functional operation under any of these conditions is not guaranteed. Recommended operating conditions Parameter Symbol MIN TYP MAX Unit Operating 3.3V CMOS I/F Ta Temperature (Note**) 5V TTL I/F Ta DVDD, Supply Voltage AVDDL, AVDDR V Note**: For operating temperature, please contact our marketing department
6 Analog Performance Test Conditions unless otherwise noted: Ta = 25 / AVDD, DVDD = 3.3 V / fs = 44.1 khz / SCLK = 512 fs / Input Signal = 1 khz 16 bit data / Measurement Bandwidth = 20 Hz to 20 khz Condition MIN TYP MAX UNIT 1 Resolution 16 Bit THD+N Vo = 0dB db Dynamic Range Vo = -60dB, EIAJ A-weighted 106 db 2 Dynamic Characteristics S/N Ratio EIAJ A-weighted 106 db Channel 1 khz 106 db Separation 3 4 DC Characteristics Analog Output On-state resistance of PWM output buffer Output Voltage *VDD - Vpp Center Voltage - VDD/2 - V Load Resistance K DVDD DVDD=3.3V 19 ma Power Supply 5 Current AVDDL, AVDDR AVDDL=AVDDR=3.3V 1.5 ma AVDDCK AVDDCK=3.3V 0.5 ma Note: Specifications subject to change without notice. Digital Filter Characteristics 1Passband Condition MIN TYP MAX UNITs -3 db fs=44.1khz KHz -6 db fs=44.1khz KHz 2 Passband Ripple db De-emphasis Filter Characteristics Condition MIN TYP MAX Unit De-emphasis Error db fs = 44.1kHz Group Delay - 2/fs - sec - 6 -
7 DC Characteristics Parameter Symbol MIN TYP MAX Unit Input Voltage High VIH 0.7 VDD --- VDD V Input Voltage Low VIL VDD V Output Voltage High VOH VDD V Output Voltage Low VOL V AC Characteristics tdcy tld tds tdh Parameter Symbol MIN TYP MAX Unit BCLK Period tdcy ns BCLK HI Pulsewidth tdch ns BCLK LO Pulsewidth tdcl ns BCLK Rising Edge -> LRCLK Edge tdl ns LRCLK Edge -> BCLK Rising Edge tld ns SDI Setup Time tsds ns SDI Hold Time tsdh ns tsch tscl Parameter Symbol MIN TYP MAX Unit SCLK Period tscy ns SCLK HI Pulsewidth tsch ns SCLK LO Pulsewidth tscl ns MSCLK Falling Edge -> LRCLK Edge tsl ns LRCLK Edge -> MSCLK Rising Edge tls ns - 7 -
8 Package Marking 12mm NS dap FN1241 JAPAN 50 pieces FN1241 are packed in a damp-proof hard-case. 12mm - 8 -
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