FN1243 converter MODEL FN1243 Specifications DIGIT
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FN1243
converter
MODEL FN1243
Specifications
DIGITAL AUDIO FLUENCY TYPE DATA COMPENSATION FILTER BUILT-IN D-class HEADPHONE AMPLIFIER BUILT-IN
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 1/16
FN1243
SUMMERY
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FN1243 2CH-1 converter 24-bit digital audio. fluency type data compensation filter built-in. Output designed drive headphone. Simple external components make this D-class amplifier. Various functions controlled with 3-wire serial interface. FEATURES 24-bit, over sampling Fluency type data compensation digital filter built-in.
90dB load=33 THD+N load=33 0.01 load=20
Sampling frequency32 KHz96
Left justified MSB, Right justified MSB, format (16//18/20/24 interface). System clock Functions Attenuator (8-bit step, independent, taper) Digital De-emphasis 44.1 Soft mute Equalizer BASS TREBLE Power down function Power supply voltage Digital (VDD) 2.7V 3.6V Analog (VCC) 2.7V 5.5V Package 16pin TSSOP/CSP (chip size package)
APPLICATIONS
converter Class-D Headphone(or small Speaker) Portable audio equipment like CD/DVD/MP3 players, player Celluar Phone Combination with Class-AB Note-book Mini-compo other digital audio system. Connect Switching Power output line make high power audio-amp with power-consumption
FDS01221001 001214 2/16
NIIGATA SEIMITSU CO., LTD.
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Block diagram
FN1243
DIGITAL
ANALOG
DRIVER LRCK SERIAL INTERFACE FLUENCY INTERPOLATOR with FUNCTION CONTROLLER
OUTL
MODULATOR
DRIVER
DRIVER
OUTR
MODE CONTROL INTERFACE
POWER SUPPLY
SYSCLK
DGND
Layout TSSOP
Terminals
Name SYSCLK DGND LRCK OUTR AGND OUTL RSTB Function Function control data Function control clock System clock Digital power supply (3.3V) Digital ground clock Audio data clock input Power down signal analog audio output Analog ground Common output Analog power supply, analog audio output Internal reset signal Function control latch
SYSCLK DGND LRCK
RSTB OUTL AGND OUTR
NIIGATA SEIMITSU CO., LTD.
RSTB
AGND
FDS01221001 001214 3/16
FN1243
Electrical characteristics
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Absolute maximum ratings Ta=25VSS=0V Item Symbol Ratings UNIT -0.3 +4.0 Power supply voltage -0.3 +6.5 -0.2 Input voltage -0.2 Output voltage Storage Temperature Tstg Note: Absolute maximum ratings highest value which doesn't harm chip. doesn't guarantee normal function. Recommended operational conditions Item Digital power supply Power supply voltage Analog power supply Environmental temp. Load resistance Analog characteristics Unless otherwise specified, Ta=25, AVDD/DVDD=3.3V, fs=44.1KHz, RL=33, Signal 1KHz bit, Measuring range 20KHz Item Condition THD+N Dynamic characteristics Dynamic range ratio Channel separation output On-state resistance Maximum range Center voltage RL=20K A-Weight A-Weight 1KHz RL=20K RL=20K 0.01 0.66*VCC VCC/2 UNIT mW/ch
Symbol
UNIT
characteristics Analog output
Maximum output power
Ivdd Power supply current Ivcc Note-3 Note-1 When external coil Precision System2 Casecade. Note-3 This current value mesured without load. currency will increase according load.
Note-2 above items were measured with evaluation board EVB1243, Audio When FN1243 used,
FDS01221001 001214 4/16
NIIGATA SEIMITSU CO., LTD.
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characteristics Item Input logic level Output logic level Symbol 0.7*VDD VCC-0.6
FN1243
0.3*VDD UNIT
characteristics Item Sampling frequency System clock frequency Symbol fsck 44.1 UNIT
LRCK
tDCY
tDCH tDCL
Item pulse cycle pulse width level pulse width level rise LRCK edge LRCK edge edge setup time hold time
Symbol tDCY tDCH tDCL tSDS tSDH
UNIT
LRCK
tSCY
SYSCLK
tSCH tSCL
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 5/16
FN1243
Item SYSCLK pulse cycle SYSCLK pulse width level SYSCLK pulse width level SYSCLK rise LRCK edge LRCK edge SYSCLK rise Symbol tSCY tSCH tSCL
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UNIT
RSTB
tRSTB
Item RSTB pulse width
Symbol tRSTB
UNIT
FDS01221001 001214 6/16
NIIGATA SEIMITSU CO., LTD.
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Terminals
RSTB
FN1243
Reset internal circuit setting this terminal "Low". Function setup register initialized. this terminal "Low" fixes OUTL OUTR terminals level when overload detected external driver circuit. terminal also fixed level. While time RSTB terminal change makes output terminal level, internal circuit delays. there influence clock. this terminal "Low" enables power down function. While this terminal "Low", OUTL OUTR terminals kept "GND" level. Operation after terminal changed from "Low" "High" shown below. Note SYSCLK, LRCK inputs shall applied normally. Start internal operation. Outputs fixed GND. Operate input data "-FS" /fs. output shifts from "-FS" "BPZ" time 1024/fs Attenuation value shifts from -db. Operation after terminal changed form "High" "Low" shown below Attenuation value shifts from current value output value shifts from "-BPZ" "-FS" time 1024/fs outputs level. Stop internal clock
SYSCLK Setup value Attenuation value 256/fs 256/fs
Output value
1024/fs
1024/fs
128/fs
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 7/16
FN1243
System clock Reference sample 32kHz 44.1kHz 48kHz 96kHz Function setting 512fs system frequency (MHz) 16.384 22.5792 24.576 49.152
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Transmitting serial data terminals enables function control.Serial control data with 16-bit data. Register mapping below:
MODE0
MODE1
MODE2
MODE3
D-MUT
MODE4
signals input timing below:
tMC(min) 200ns, tDC(min) tCD(min) tML(min) 100ns Control register mode control basically basic mode registers (MODE0 MODE4). 16-bit serial data selects register contents. Choose first register with bit, then other controls desired functions. Selection control register mode Register MODE0 MODE1 MODE2 MODE3 MODE4
FDS01221001 001214 8/16
NIIGATA SEIMITSU CO., LTD.
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IW2, IW1, These control registers choose audio input data format data length. Audio Format right justified right justified right justified right justified left justified left justified left justified left justified
FN1243
Default
Attenuator MODE0 MODE1 digital control registers. AL7-AL0(Lch)AR7-AR0(Rch) each (AL7, MSB, control attenuator with steps respectively. used attenuator value. enables attenuator setup value. When both "0", Attenuator value setup valid, actual attenuator value keeps previous value. It's updated when becomes Shift time from 256/fs. Attenuation values given with this formula.
DATA: Attenuator setup value FFh6B FEh5.75B F7h0B 01h5.75B 00h-(MUTE)
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 9/16
FN1243
Driver mute control D-MUT Soft mute Default Enables drivers soft mute.
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Soft mute Soft mute Enables soft mute.
Default
Attenuator control Attenuator control Default Lch/Rch Independent Lch/Rch Common AL7-0 used attenuation level AR7-0 attenuation level when ATC=0. AL7-0 used Attenuation Level both Lch/Rch when ATC=1.
Common signal output control signal output Default Outputs signal drive common terminal headphone when BPZ=1.This terminal drive headphone direct without adding capacitor filter.
LRCK polarity control LRCK polarity
Default
Lch:H, Rch:L
Lch:L, Rch:H register inverse LRCK clock polarity normal data form LRCK clock polarity select control.
FDS01221001 001214 10/16
NIIGATA SEIMITSU CO., LTD.
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FN1243
De-emphais sontrol De-emphais De-emphais sontrol Default 48kHz 44.1kHz 32kHz Select coefficient according de-emphasis filter On/Off sampling frequencies. Audio input signal Logic inverse control LRCK, BCK, logic Default Positive logic input Negative logic input Inverse logic input signal LRCK, BCK, DIN. Normal logic when INV=0. Take "not" from input signal internally when INV=1. Output control output output Defaul
data data data output inversed output inversed data (L+R)/2 output inversed Select 0M1, corresponds single output output. Normal stereo output when 0M1, 0M0=00. exclusive output when 0M1, 0M0=01. exclusive output when 0M1, 0M0=10 Monaural data generated output when 0M1, 0M0=11
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 11/16
FN1243
Equalizer characteristics Bass boost level +2dB +4dB +6dB +8dB +10dB +12dB +12dB -2dB -4dB -6dB -8dB -10dB -12dB -12dB Default
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Bass boost level +2dB +4dB +6dB +8dB +10dB +12dB +12dB -2dB -4dB -6dB -8dB -10dB -12dB -12dB
Default
next page equalizer frequency characteristics
FDS01221001 001214 12/16
NIIGATA SEIMITSU CO., LTD.
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Equalizer frequency characteristics 44.1 sampling
FN1243
44.1kHzBass Equalizer Bass characteristics
Amplitude [dB] [dB]
0.01 [kHz]
Frequency [KHz]
44.1kHz Treble
Equalizer Treble characteristics
Amplitude [dB] [dB]
0.01
Frequency [KHz] [KHz]
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 13/16
FN1243
Audio format
LRCK LRCK
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Justified
Justified 16bit
16-bit 18-bit 20-bit
18bit 20bit
24bit 24-bit 16bit 16-bit
18-bit 20-bit 24-bit
18bit 20bit
24bit
Operation synchronic phase SYSCLK+/-10 clock max. allowable when LRCK shifts against SYSCLK, there definition about phase between LRCK SYSCLK though. Operation becomes intermittent when more shift appears because internal synchronization recovery starts This intermittent operation influences analog outputs. digital filter output order suppress this influence minimum. When synchronizing recovered, attenuation reset pre-determined value with digital attenuator
Internal condition
Normal operation Setup value
Synchronizing
Normal operation Setup value
Attenuation value
FDS01221001 001214 14/16
NIIGATA SEIMITSU CO., LTD.
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Application example
FN1243
OUTL/R
100uH
Filmac TU02M TU02M
220F
0.1F
Headphone
Fc=40kHz Filmac TU02M
TU02M
Fc=28Hz
OUTL/R
100uH
0.1uF 100uF 10uH
Headphone
Filmac TU02M TU02M
Filmac TU02M Frequency characteristics Filmac improves
Gain[dB]
Frequency [MHz]
1000
NIIGATA SEIMITSU CO., LTD.
FDS01221001 001214 15/16
FN1243
Package Marking
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TSSOP16
Year code Week code
FDS01221001 001214 16/16
NIIGATA SEIMITSU CO., LTD.
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