QS7777PF/CF QSurround™ 3D Virtual Audio Processor for Dolby AC-3 and ProLogic NIPPON PRECISION CIRCUITS INC. OVERVIEW The QS7777PF/CF is an audio processor IC which implements the QSurround™ technology developed and licensed by QSound Labs, Inc. It processes Dolby Digital (AC-3) and Dolby Surround audio sig- nals to produce enhanced virtual 3D sounds, even for 2-speaker systems. It can generate 2, 3, 4, and 5channel speaker configurations, all with enhanced surround signal outputs. FEATURES PINOUT 1. NPC employs I2C bus serial interface components under license from Philips, and conforms to the Philips I2C bus specifications. QS7777CF VCC QXBC5 QXBC4 QXBC3 QXBC2 QXBC1 QXAC5 30 29 28 27 26 25 FROUT SUBIN 43 18 COUT RLIN 44 17 RLOUT RRIN 45 16 RROUT MSC4 46 15 VDD MSC5 47 14 P/S MSC6 48 13 BYP 8 9 10 MUTE(SCL) SPREAD(SDA) AC AR MO QXBC3 QXBC2 QXBC1 QXAC5 27 26 25 12 7 PSAVE(STRB) 11 6 4 MSC2 GND 3 MSC3 5 2 VREFIN MSC1 1 VREFOUT QS7777PF QXCC4 QXCC3 QXCC2 QXCC1 VCC QXBC5 QXBC4 34 33 32 31 30 29 28 Top view QXDC2 QXDC3 37 24 QXAC4 38 23 QXAC3 QXDC4 39 22 QXAC2 FLIN 40 21 QXAC1 FRIN 41 20 FLOUT CIN 42 19 FROUT SUBIN 43 18 COUT RLIN 44 17 RLOUT RRIN 45 16 RROUT MSC4 46 15 VDD MSC5 47 14 P/S MSC6 48 13 BYP 8 9 10 11 12 MUTE(SCL) SPREAD(SDA) AC AR MO QS7777CF 7 48-pin QFP QXCC1 19 PSAVE QS7777CF 31 42 6 48-pin QFP QXCC2 FLOUT CIN GND QS7777PF 32 20 5 P ackag e QXCC3 41 MSC1 D e vice 33 QXAC1 FRIN 4 ORDERING INFORMATION QXCC4 21 MSC2 ■ 34 40 3 ■ QXDC1 QXAC2 FLIN MSC3 ■ DVD and laser disk players TV and AV equipment Multimedia products (including sound cards) Car audio 35 QXAC3 QXDC4 22 APPLICATIONS ■ 36 QXAC4 23 39 QXDC1 ■ ■ 24 38 35 ■ 37 36 ■ QXDC2 QXDC3 2 ■ Top view 1 ■ QS7777PF VREFIN ■ Enhanced surround signal from Dolby Digital (AC-3) and Dolby Surround (ProLogic) input signals 2-step adjustable sound enhancement Supported speaker configurations • Dolby Digital (AC-3) 6-channel signals to 2, 3, 4, 5-channel speaker QSurround signal configurations • Dolby Surround (ProLogic) 4-channel signals to 2, 3, 4-channel speaker QSurround signal configurations Monaural to virtual stereo conversion Parallel and 2 serial interface control modes selectable • QS7777CF: I2C bus 2-wire serial interface1 • QS7777PF: 3-wire serial interface (Data, Clock, Strobe) 5 to 13V analog supply 4.5 to 5.5V digital supply 48-pin QFP package VREFOUT ■ I2 C bus is a registered tra d e m a r k of Philips Electronics N.V. Dolby and the double-D symbol are registered tra d e m a r ks of Dolby Laboratories Licensing Corporation. NIPPON PRECISION CIRCUITS—1 QS7777PF/CF PACKAGE DIMENSIONS Unit: mm 0.35max 0.17 0.05 1.00typ 7.00 0.20 7.00 0.20 9.00 0.20 0.50 0.10 0.10 0.07 0.20 1.50 0.10 0 to 10 9.00 0.20 0.339typ 0.10 0.50 0.19 0.05 0.08 M VDD GND VREFOUT VCC VREFIN BLOCK DIAGRAM Digital Circuitry M Qsound 3D Process FLOUT M VREF Analog Circuitry FLIN FROUT RLOUT Matrix Switch FRIN RLIN MONO to STEREO RROUT COUT Qsound 3D Process RROUT CIN SUBIN Controls Decoder/Data Latches ,,,,,,,,,,,,,,,,, ,,,,,, ,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,, ,,,,,, ,,,,,, DATA Shift Register AC SPREAD (SDA) MUTE (SCL) PSAVE (STRB) AR MO CLK BYP P/S Parallel/Serial Switch NIPPON PRECISION CIRCUITS—2 QS7777PF/CF PIN DESCRIPTION Number Name P arallel Serial I/O Description 1 VREFOUT O V C C /2 reference voltage output 2 VREFIN I V C C /2 reference voltage input (biased internally to V C C /2) 3 MSC3 I Mono/stereo conversion filter capacitor 3 4 MSC2 I Mono/stereo conversion filter capacitor 2 5 MSC1 I Mono/stereo conversion filter capacitor 1 6 GND – Ground 7 8 9 P S AV E – I Pow er save control (HIGH: pow er save on, LOW : pow er save off) – STRB I Serial data strobe (not used on I 2 C bus device QS7777CF) MUTE – I Mute signal control (HIGH: mute on, LOW : mute off) – SCL I Serial data shift clock input (QS7777CF: CMOS input, no protection diode connected between this pin and V D D ) SPREAD – I Enhancement control (HIGH: maximum spread, LOW : minimum spread) – SDA I/O Serial data input (and ACK signal output for I2 C bus device QS7777CF: n-channel open-drain pin, no protection diode connected between this pin and VDD). 10 AC I 11 AR I Center speaker control (HIGH: actual center, LOW : virtual center) Rear speaker control (HIGH: actual rear, LOW : virtual rear) 12 MO I Mono-to-stereo convert select (HIGH: ON, LOW : OFF) 13 BYP I Bypass/QSurround select control (HIGH: bypass, LOW : QSurround) 14 P/S I Interface method select (HIGH: parallel input, LOW : serial input) 4.5 to 5.5V DC digital supply 15 VDD – 16 RROUT O Rear right-channel signal output 17 RLOUT O Rear left-channel signal output 18 COUT O Center signal output 19 FROUT O Front right-channel signal output 20 FLOUT O Front left-channel signal output 21 QXAC1 I QExpander filter A capacitor 1 22 QXAC2 I QExpander filter A capacitor 2 23 QXAC3 I QExpander filter A capacitor 3 24 QXAC4 I QExpander filter A capacitor 4 25 QXAC5 I QExpander filter B capacitor 5 26 QXBC1 I QExpander filter B capacitor 1 27 QXBC2 I QExpander filter B capacitor 2 28 QXBC3 I QExpander filter B capacitor 3 29 QXBC4 I QExpander filter B capacitor 4 30 QXBC5 I QExpander filter B capacitor 5 31 VCC – 5 to 13V DC analog supply 32 QXCC1 I QExpander filter C capacitor 1 33 QXCC2 I QExpander filter C capacitor 2 34 QXCC3 I QExpander filter C capacitor 3 35 QXCC4 I QExpander filter C capacitor 4 36 QXDC1 I QExpander filter D capacitor 1 37 QXDC2 I QExpander filter D capacitor 2 38 QXDC3 I QExpander filter D capacitor 3 39 QXDC4 I QExpander filter D capacitor 4 40 FLIN I Front left-channel signal input 41 FRIN I Front right-channel signal input 42 CIN I Center-channel signal input 43 SUBIN I S u b - woofer signal input 44 RLIN I Rear left-channel signal input Rear right-channel signal input 45 RRIN I 46 MSC4 I Mono/stereo conversion filter capacitor 4 47 MSC5 I Mono/stereo conversion filter capacitor 5 48 MSC6 I Mono/stereo conversion filter capacitor 6 NIPPON PRECISION CIRCUITS—3 QS7777PF/CF SPECIFICATIONS Absolute Maximum Ratings P arameter Symbol Rating Unit Supply voltage range (analog) VCC −0.3 to 15 V Supply voltage range (digital) VDD −0.3 to 7 V Input voltage range (analog) V IANA −0.3 to V C C + 0.3 V Input voltage range (digital) V IDIG −0.3 to V D D + 0.3 V V IOPEN 10 V Pow er dissipation PD 250 mW Storage temperature range T stg −40 to 125 °C Soldering temperature T sld 255 °C Soldering time tsld 10 s Symbol Rating Unit Supply voltage range (analog) VCC 5 to 13 V Supply voltage range (digital) VDD 4.5 to 5.5 V Operating temperature range T opr −20 to 70 °C I2 C signal input voltage (SDA, SCL) Recommended Operating Conditions P arameter DC Characteristics VCC = 9V, VDD = 5V, Ta = 25°C Rating P arameter Symbol Condition typ max 16 20 24 kΩ Analog input impedance Z AIN Reference voltage output VREFOUT – V C C /2 – V HIGH-level input voltage V IH 0.7V D D – – V L O W -level input voltage V IL – – 0.3V D D V IL E A K −3 – 3 µA S D A, SCL, 10V input voltage −3 – 3 µA A CK signal output on SDA, 3mA sink current 0 – 0.4 V Input leakage current Input leakage current (I 2 C input) IL O P E N FLIN, FRIN, RLIN, RRIN, CIN, COUT Unit min L O W -level output voltage VOL Supply voltage (analog) VCC 5 – 13 V Supply voltage (digital) VDD 4.5 – 5.5 V Current consumption (analog) IC C – 10 13 mA Current consumption (digital) ID D – 0.3 0.5 mA IC C S AV E – 0.1 0.2 mA Standby current (analog) Quiescent input signal NIPPON PRECISION CIRCUITS—4 QS7777PF/CF Noise and THD Characteristics VCC = 9V, VDD = 5V, Ta = 25°C P arameter Symbol Condition Bypass noise voltage N BYP QSurround noise voltage (front) Rating Unit min typ max BYP = AR = AC = HIGH, MO = SPREAD = L O W , “A”-wgt, FLOUT, R L O U T, FRO U T, R R O U T, C O U T – 11 22 µVRMS N QSF B Y P = M O = S P R E A D = L OW , AR = AC = HIGH, “A”-wgt, FLOUT, FRO U T – 16 32 µVRMS QSurround noise voltage (rear) NQSR B Y P = M O = S P R E A D = L OW , AR = AC = HIGH, “A”-wgt, RLOUT, RRO U T – 14 28 µVRMS QSurround mono total harmonic distortion (front) THDF MO = HIGH, all other excluding MO = L O W , all inputs 1V R M S , f = 1kHz, FRO U T, FLOUT – – 0.1 % QSurround mono total harmonic distortion (rear) THDR MO = AR = AC = HIGH, BYP = SPREAD = AE = LOW , all inputs 1V R M S , f = 1kHz, R R O U T, R L O U T, C O U T – – 0.1 % AC Characteristics VCC = 9V, VDD = 5V, Ta = 25°C P arameter Symbol Condition Front maximum input voltage 1 V FIN1 Front maximum input voltage 2 Rating Unit min typ max FLIN = FRIN, RLIN = RRIN = CIN = SUBIN = 0V, BYP = LOW , f = 1kHz 1.4 – – VRMS V FIN2 FLIN = −FRIN, RLIN = RRIN = CIN = SUBIN = 0V, BYP = LOW , f = 1kHz 0.5 – – VRMS Rear maximum input voltage 1 V RIN1 RLIN = RRIN, FLIN = FRIN = CIN = SUBIN = 0V, BYP = LOW , AR = LOW , f = 1kHz 1.4 – – VRMS Rear maximum input voltage 2 V RIN2 RLIN = −RRIN, FLIN = FRIN = CIN = SUBIN = 0V, BYP = LOW , AR = LOW , f = 1kHz 0.3 – – VRMS Center maximum input voltage V CIN FLIN = FRIN = RLIN = RRIN = SUBIN = 0 V, BYP = LOW , AC = LOW , f = 1kHz 1.7 – – VRMS S u b - woofer maximum input voltage V SUBIN FLIN = FRIN = RLIN = RRIN = CIN = 0V, f = 1kHz 2.2 – – VRMS FIN to FOUT bypass gain G FFBYP BYP = HIGH, f = 1kHz, FLIN to FLOUT, FRIN to FRO U T −2 0 2 dB RIN to RO U T bypass gain G RRBYP BYP = HIGH, AR = HIGH, f = 1kHz, RLIN to RLOUT, RRIN to RRO U T −2 0 2 dB RIN to FOUT bypass gain G RFBYP BYP = HIGH, AR = LOW , f = 1kHz, RLIN to FLOUT, RRIN to FRO U T −2 0 2 dB G CC A C = HIGH, f = 1kHz, CIN to COUT −2 0 2 dB G CF A C = LOW , f = 1kHz, CIN to FLOUT, CIN to FRO U T −2.8 −0.8 1.2 dB G SUBF f = 1kHz, SUBIN to FLOUT, SUBIN to FROUT −8 −6 −4 dB CIN to COUT gain CIN to FOUT gain SUBIN to FOUT gain FIN to FOUT gain G FF SPREAD = HIGH, BYP = LOW , f = 1kHz, FLIN to FLOUT, FRIN to FRO U T 5.7 7.5 9.5 dB FIN to FOUT crosstalk gain G FXF SPREAD = HIGH, BYP = LOW , f = 1kHz, FLIN to FRO U T, FRIN to FLOUT 3.7 5.7 7.7 dB RIN to ROUT gain G RR B Y P = L OW , AR = HIGH, f = 1kHz, RLIN to RLOUT, RRIN to RRO U T 2.7 4.7 6.7 dB RIN to ROUT crosstalk gain G RXR B Y P = L OW , AR = HIGH, f = 1kHz, RLIN to RRO U T, RRIN to RLOUT −1.2 0.8 2.8 dB NIPPON PRECISION CIRCUITS—5 QS7777PF/CF P arameter Symbol Rating Condition min typ max Unit RIN to FOUT gain G RF SPREAD = HIGH, BYP = LOW , AR = L O W , f = 1kHz, RLIN to FLOUT, RRIN to FROUT 8 10 12 dB RIN to FOUT crosstalk gain G RXF SPREAD = HIGH, BYP = LOW , AR = L O W , f = 1kHz, RLIN to FRO U T, RRIN to FLOUT 8.5 10.5 12.5 dB t0 QS7777PF 100 – – ns SCL clock HIGH-level pulsewidth t1 QS7777PF 40 – – ns SCL clock LOW -level pulsewidth t2 QS7777PF 40 – – ns S D A setup time t3 QS7777PF 15 – – ns S D A hold time t4 QS7777PF 30 – – ns STRB setup time t5 QS7777PF 50 – – ns STRB clock pulsewidth t6 QS7777PF 100 – – ns t7 SCL clock pulse period STRB hold time QS7777PF 50 – – ns SCL hold time tH D ; S TA QS7777CF (I 2 C) 4.0 – – µs SCL setup time tS U ; S TO QS7777CF (I 2 C) 4.0 – – µs S D A hold time tH D ; DAT QS7777CF (I 2 C) 5.0 – – µs tS U ; DAT (I 2 C) S D A setup time 250 – – ns SCL clock HIGH-level pulsewidth tH I G H QS7777CF (I 2 C) 4.0 – – µs SCL clock LOW -level pulsewidth tL O W QS7777CF (I 2 C) 4.7 – – µs tr QS7777CF (I 2 C) – – 1000 ns tf (I 2 C) – – 300 ns PSAVE MUTE SCL rise time SCL fall time QS7777CF QS7777CF Serial Interface Timing 3-wire (QS7777PF) timing SDA X BYP MO AR AC SPRD AREA SCL t3 t4 t1 t5 t7 t6 t2 t0 STRB I2C 2-wire (QS7777CF) timing SDA AD6 tHD;STA AD0 BYP MO AR AC tSU;DAT SPRD AREA PSAVE tr tHD;DAT tf MUTE tSU;STO SCL tHIGH tLOW AD6:0 represents the QS7777CF I 2 C slave address 0011110. NIPPON PRECISION CIRCUITS—6 QS7777PF/CF FUNCTIONAL DESCRIPTION Operating Modes (BYP, MO, AR, AC) The control pins BYP, MO, AR, and AC select the operating mode bypass/QSurround signal processing of the FLIN, FRIN, RLIN, RRIN, CIN, and SUBIN input signals and determine the outputs on FLOUT, FROUT, RLOUT, RROUT, and COUT. The relationship between the inputs and outputs as selected by the control pins is shown in the following table. Output signals 1 Control pins BYP MO AR AC FLOUT FROUT 0 0 0 0 Qx(FLIN) +Q1(RLIN) 0 0 0 1 Qx(FLIN) +Q1(RLIN) 0 0 1 0 Qx(FLIN) 0 0 1 1 Qx(FLIN) 0 1 0 0 Qx(FLIN) +Q1(M(R)) 0 1 0 1 Qx(FLIN) +Q1(M(R)) 0 1 1 0 Qx(FLIN) 0 1 1 1 Qx(FLIN) 1 0 0 0 FLIN +RLIN 1 0 0 1 FLIN +RLIN 1 0 1 0 FLIN 1 0 1 1 FLIN FRIN 1 1 0 0 Q1(M(F)) Q1(M(F)) 1 1 0 1 Q1(M(F)) 1 1 1 0 1 1 1 1 +CIN +CIN Qx(FRIN) +Q1(RRIN) Qx(FRIN) +Q1(RRIN) Qx(FRIN) RLOUT CIN +CIN +CIN Qx(FRIN) +Q1(M(R)) Qx(FRIN) +Q1(M(R)) Qx(FRIN) +CIN +RRIN FRIN +RRIN FRIN q(RRIN) q(RLIN) q(RRIN) CIN CIN +CIN FRIN q(RLIN) +CIN Qx(FRIN) +CIN COUT +CIN Qx(FRIN) +CIN RROUT q(M(R)) q(M(R)) q(M(R)) q(M(R)) CIN +CIN CIN +CIN RLIN RRIN RLIN RRIN Q1(M(F)) q(M(F)) q(M(F)) Qx(FLIN) Qx(FRIN) q(FLIN) q(FRIN) FLIN FRIN FLIN FRIN CIN 1. Qx( ), Q1( ), and q( ) = QSurround processed signals. For example, Qx(FLIN) indicates a QSurround-processed signal derived from FLIN input. R = RLIN + RRIN signal, and F = FLIN + FRIN signal. M( ) = monaural to stereo converted signal. For example, M(R) indicates monaural to stereo conversion of the RLIN+RRIN signal. The SUBIN signal is normally output on both FLOUT and FRO U T. NIPPON PRECISION CIRCUITS—7 QS7777PF/CF Controls (SPREAD, AREA) The SPREAD input and AREA flag are used to control the FLOUT and FROUT signals in QSurround mode. In QSurround mode, the total sound heard is an enhanced version (virtual sound source) of the actual sound sources (speaker). When SPREAD is HIGH, the virtual sound source is widened, strengthening the surround enhancement effect. The AREA Enhanced FLIN Sound Source with SPREAD = L Enhanced FLIN Sound Source with SPREAD = H Virtualized RLIN Sound Source with SPREAD = L Virtualized RLIN Sound Source with SPREAD = H Front Left Speaker Wider Listening Area (AREA = H) flag is used to widen the surround sound effect sweet-spot. This can be used for a larger listening audience. Note that AREA is set by serial input data only, and is therefore not available in parallel interface mode. The SPREAD and AREA control functions are shown in the following figure. Front Right Speaker Enhanced FRIN Sound Source with SPREAD = L Narrower Listening Area (AREA = L) Enhanced FRIN Sound Source with SPREAD = H Virtualized RRIN Sound Source with SPREAD = L Virtualized RRIN Sound Source with SPREAD = H NIPPON PRECISION CIRCUITS—8 QS7777PF/CF TYPICAL APPLICATION CIRCUITS QS7777PF Parallel Interface VCC 10µ 4700p 0.022µ 0.47µ 4700p 0.022µ 0.47µ 0.022µ 0.47µ 0.022µ QXAC5 QXDC1 QXAC3 40 FLIN QXAC1 21 41 FRIN FLOUT 20 42 CIN FROUT 19 RLOUT 17 45 RRIN RROUT 16 0.47µF 4.7µF 4.7µF 4.7µF 4.7µF 4.7µF VDD 15 0.1µ FLOUT FROUT COUT RLOUT RROUT VDD P/S 14 MO 12 AR 11 AC 10 MUTE(SCL) 8 GND 6 MSC1 5 2 1 13 BYP 2700p 0.22µ 0.022µ 10µ 10µ VREFOUT VDD MSC2 4 48 MSC6 MSC3 3 VREFIN 0.082µ SPREAD(SDA) 9 44 RLIN 47 MSC5 0.022µF COUT 18 46 MSC4 0.012µ 23 QXAC2 22 PSAVE(STRB) 7 1000p 25 QXBC1 4.7µ RRIN QXAC4 0.022µF 24 39 QXDC4 43 SUBIN 4.7µ RLIN 26 4.7µ SUBIN 27 QXBC2 4.7µ CIN 28 QXBC3 FRIN 29 QXBC4 4.7µ 30 QXBC5 4.7µ QXDC3 31 VCC 38 0.022µ 32 QXCC1 0.022µ FLIN QXCC4 37 33 QXCC2 34 QXCC3 35 36 QXDC2 10k 10k 10k 10k 10k 10k 10k QS7777PF Serial Interface VCC 10µ 4700p 0.022µ 0.47µ 0.022µ 4700p 0.47µ 0.022µ 0.47µ 0.022µ QXAC5 QXDC1 25 QXBC1 QXAC1 21 41 FRIN FLOUT 20 42 CIN FROUT 19 43 SUBIN 44 RLIN RLOUT 17 45 RRIN RROUT 16 0.47µF 4.7µF 4.7µF 4.7µF 4.7µF 4.7µF VDD 15 0.1µ FLOUT FROUT COUT RLOUT RROUT VDD P/S 14 AR 11 MO 12 AC 10 GND 6 2 1 13 BYP 2700p 0.22µ 0.022µ 10µ 10µ VREFOUT MSC1 5 48 MSC6 MUTE(SCL) 8 46 MSC4 47 MSC5 0.022µF COUT 18 MSC2 4 0.082µ 23 40 FLIN MSC3 3 VREFIN 0.012µ QXAC3 QXAC2 22 SPREAD(SDA) 9 1000p 26 4.7µ QXAC4 0.022µF 24 39 QXDC4 PSAVE(STRB) 7 RRIN 4.7µ 27 QXBC2 RLIN 4.7µ 28 QXBC3 SUBIN 4.7µ 29 QXBC4 CIN 30 QXBC5 FRIN 4.7µ QXDC3 31 VCC FLIN 4.7µ 38 32 QXCC1 0.022µ QXCC4 0.022µ 37 33 QXCC2 34 QXCC3 35 36 QXDC2 STROBE CLOCK SERIAL DATA NIPPON PRECISION CIRCUITS—9 QS7777PF/CF QS7777CF Parallel Interface VCC 10µ 4700p 0.47µ 4700p 0.022µ 0.47µ 0.022µ 0.47µ 0.022µ 0.022µ QXAC5 QXDC1 QXAC3 40 FLIN QXAC1 21 41 FRIN FLOUT 20 42 CIN FROUT 19 RLOUT 17 45 RRIN RROUT 16 0.47µF 4.7µF 4.7µF 4.7µF 4.7µF 4.7µF VDD 15 0.1µ FLOUT FROUT COUT RLOUT RROUT VDD P/S 14 MO 12 AR 11 AC 10 PSAVE 7 GND 6 MSC1 5 2 1 13 BYP 2700p 0.22µ 0.022µ 10µ 10µ VREFOUT VDD MSC2 4 48 MSC6 MSC3 3 VREFIN 0.082µ SPREAD(SDA) 9 44 RLIN 47 MSC5 0.022µF COUT 18 46 MSC4 0.012µ 23 QXAC2 22 MUTE(SCL) 8 1000p 25 QXBC1 4.7µ RRIN QXAC4 0.022µF 24 39 QXDC4 43 SUBIN 4.7µ RLIN 26 4.7µ SUBIN 27 QXBC2 CIN 28 QXBC3 4.7µ 29 QXBC4 FRIN 30 QXBC5 4.7µ 31 VCC 4.7µ QXDC3 32 QXCC1 38 0.022µ FLIN QXCC4 37 0.022µ 33 QXCC2 34 QXCC3 35 36 QXDC2 10k 10k 10k 10k 10k 10k 10k QS7777CF Serial Interface VCC 10µ 4700p 0.022µ 0.47µ 0.022µ 4700p 0.47µ 0.022µ 0.47µ 0.022µ QXAC5 QXDC1 25 QXBC1 QXAC1 21 41 FRIN FLOUT 20 42 CIN FROUT 19 43 SUBIN 44 RLIN RLOUT 17 45 RRIN RROUT 16 46 MSC4 0.47µF 4.7µF 4.7µF 4.7µF 4.7µF 4.7µF VDD 15 0.1µ FLOUT FROUT COUT RLOUT RROUT VDD P/S 14 AR 11 MO 12 AC 10 PSAVE 7 2 1 13 BYP 2700p 0.22µ 0.022µ 10µ 10µ VREFOUT GND 6 48 MSC6 MSC1 5 47 MSC5 0.022µF COUT 18 MSC2 4 0.082µ 23 40 FLIN MSC3 3 VREFIN 0.012µ QXAC3 QXAC2 22 MUTE(SCL) 8 1000p 26 4.7µ QXAC4 0.022µF 24 39 QXDC4 SPREAD(SDA) 9 RRIN 4.7µ 27 QXBC2 RLIN 4.7µ 28 QXBC3 SUBIN 29 QXBC4 CIN 4.7µ QXDC3 30 QXBC5 FRIN 4.7µ 38 31 VCC FLIN 4.7µ 37 32 QXCC1 0.022µ QXCC4 0.022µ 33 QXCC2 34 QXCC3 35 36 QXDC2 CLOCK SERIAL DATA NIPPON PRECISION CIRCUITS—10 QS7777PF/CF NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NC9821AE 1999.11 NIPPON PRECISION CIRCUITS—11