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QS7785PF/CF
NIPPON PRECISION CIRCUITS INC.
3D 2/4-Channel Stereo Surround Synthesizer
OVERVIEW
The QS7785PF/CF is an audio processor IC that generates 2, 4, 5-channel stereo surround signals from 2-channel stereo or mono sources using QSurroundTM technology developed and licensed by QSound Labs, Inc. It can create 2-channel left and right surround effect signal for front speakers, and a rich enhanced surround signal using front speakers and surround speakers for 4-channel output. It also features a center signal output for clear listening of vocal and speech signals.
FEATURES
I
I
I I
Surround signal output for 2-channel front speakers Surround signal output for 4-channel front + surround speakers Center speaker output for voice signals Parallel and 2 serial interfaces for mode control supported
I I I
* QS7785CF: I2C bus 2-wire serial interface (Data and Clock) * QS7785PF: 3-wire serial interface (Data, Clock and Strobe) 5 to 13V analog supply 4.5 to 5.5V digital supply 48-pin QFP package
APPLICATIONS
I I
TV, radio and VCRs Car audio
I
Multimedia products
PINOUT (Top view)
QS7785PF
FROUT FLOUT QXAC1 QXAC2 QXAC3 QXAC4 QXBC1 QXBC2 QXBC3 QXBC4
QS7785CF
FROUT
26
QXAC1
QXAC2
QXAC3
QXAC4
QXBC1
QXBC2
QXBC3
36
35
34
33
32
31
30
29
28
27
26
25
36
35
34
33
32
31
30
29
28
27
QXBC4
BASC1
BASC1
VCC
VCC
RIN LIN BASC2 MSC6 MSC5 MSC4 MSC3 MSC2 MSC1 QXCC1 QXCC2 QXCC3
37 38 39 40 41 42 43 44 45 46 47 48 10 11 12 1 2 3 4 5 6 7 8 9
24 23 22 21 20 19
SROUT SLOUT COUT CIN LPC VREFIN N.C. VREFOUT PSAVE MUTE BASS SUR(SCL)
RIN LIN BASC2 MSC6 MSC5 MSC4 MSC3 MSC2 MSC1 QXCC1 QXCC2 QXCC3
25
FLOUT
24 23 22 21 20 19
37 38 39 40 41 42 43 44 45 46 47 48 10 11 12 1 2 3 4 5 6 7 8 9
SROUT SLOUT COUT CIN LPC VREFIN N.C. VREFOUT PSAVE MUTE BASS SUR(SCL)
QS7785PF
18 17 16 15 14 13
QS7785CF
18 17 16 15 14 13
SP(STRB)
BYP(SDA)
ORDERING INFORMATION
Device QS7785PF QS7785CF Package 48-pin QFP 48-pin QFP
I2C bus is a registered trademark of Philips Electronics N.V. Dolby and the double-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation. NIPPON PRECISION CIRCUITS--1
BYP(SDA)
QXCC4
QXDC1
QXDC2
QXDC3
QXDC4
QXCC4
QXDC1
QXDC2
QXDC3
QXDC4
VDD
GND
MONO
GND
VDD
P/S
P/S
MONO
AC
SP
AC
QS7785PF/CF
PACKAGE DIMENSIONS
(Unit: mm)
0.35max
0.17 0.05
0.339typ
1.00typ
9.00 0.20
7.00 0.20
0 to 10
9.00 0.20
0.50
0.10 0.19 0.05 0.08 M
BLOCK DIAGRAM
QXDC1 QXDC2 3 QXDC3 4 QXDC4 5 26 Front QEXPANDER QXCC1 QXCC2 QXCC3 QXCC4 1 QXAC1 QXAC2 QXAC3 QXAC4 QXBC1 QXBC2 QXBC3 QXBC4
36 BASC1 RIN 37
35 34 33 32 30 29 28 27
0.10 0.07
7.00 0.20
0.20 1.50 0.10
0.50 0.10
46 47 48
2
FROUT
38 LIN BASC2 MSC6 MSC5 MSC4 MSC3 MSC2 MSC1 VCC VREFIN GND 39
25 24
FLOUT SROUT
Mono to Stereo
40 41 42 43 44 45
Surround QEXPANDER
23
SLOUT
To internal Multiplex/Decode/Level Shift
21 22 20 Serial I/O
CIN COUT LPC
31 19 6 17 VREFOUT
To internal
18 N.C.
16 15 14 10 11 9 13 12 PSAVE MUTE BASS MONO AC SP(STRB) SUR(SCL) BYP(SDA)
7 VDD
8 P/S
NIPPON PRECISION CIRCUITS--2
QS7785PF/CF
PIN DESCRIPTION
Name Number Parallel 1 2 3 4 5 6 7 8 SP 9 - 10 11 BYP 12 - SUR 13 - 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 BASS MUTE PSAVE VREFOUT NC VREFIN LPC CIN COUT SLOUT SROUT FLOUT FROUT QXBC4 QXBC3 QXBC2 QXBC1 VCC QXAC4 QXAC3 QXAC2 QXAC1 BASC1 SCL I I I I O - I I I O O O O O O I O I - O I O I I Serial clock signal input Bass boost mode control (HIGH: bass boost on, LOW: bass boost off) Mute signal control (HIGH: mute on, LOW: mute off) Power save control (HIGH: power save on, LOW: power save off) VCC/2 reference voltage output No connection VCC/2 reference voltage output (biased internally to VCC/2) Center output lowpass filter COUT output signal feedback input for front-channel output Center signal output Surround left-channel signal output Surround right-channel signal output Front left-channel signal output Front right-channel signal output QEXPANDER B capacitor 4 QEXPANDER B capacitor 3 QEXPANDER B capacitor 2 QEXPANDER B capacitor 1 5 to 13V DC analog supply QEXPANDER A capacitor 4 QEXPANDER A capacitor 3 QEXPANDER A capacitor 2 QEXPANDER A capacitor 1 Bass boost right-channel signal input SDA - I/O I MONO AC - STRB I I I I Serial data strobe (not applicable to QS7785CF) Mono-to-stereo convert select (HIGH: mono to stereo mode, LOW: normal mode) Center output control (HIGH: center on, LOW: center off) Bypass control (HIGH: bypass, LOW: Qsurround) Serial data input (also serves as ACK signal output for I2C bus) Surround speaker control (HIGH: surround speaker on, LOW: off) QXCC4 QXDC1 QXDC2 QXDC3 QXDC4 GND VDD P/S - Serial O I O I O - - I I QEXPANDER C capacitor 4 QEXPANDER D capacitor 1 QEXPANDER D capacitor 2 QEXPANDER D capacitor 3 QEXPANDER D capacitor 4 Ground 4.5 to 5.5V digital supply Input mode control (HIGH: parallel, LOW: serial) Enhancement control (HIGH: high spread, LOW: low spread) I/O Description
NIPPON PRECISION CIRCUITS--3
QS7785PF/CF
Name Number Parallel 37 38 39 40 41 42 43 44 45 46 47 48 RIN LIN BASC2 MSC6 MSC5 MSC4 MSC3 MSC2 MSC1 QXCC1 QXCC2 QXCC3 Serial I I I I I I I I I I O I Right-channel signal input Left-channel signal input Bass boost left-channel signal input Mono/stereo conversion filter capacitor 6 Mono/stereo conversion filter capacitor 5 Mono/stereo conversion filter capacitor 4 Mono/stereo conversion filter capacitor 3 Mono/stereo conversion filter capacitor 2 Mono/stereo conversion filter capacitor 1 QEXPANDER C capacitor 1 QEXPANDER C capacitor 2 QEXPANDER C capacitor 3 I/O Description
SPECIFICATIONS
Absolute Maximum Ratings
GND = 0V
Parameter Supply voltage range (analog) Supply voltage range (digital) Input voltage range (analog) Input voltage range (digital) I2C signal input voltage (SDA, SCL) Power dissipation Storage temperature range Symbol VCC VDD VIANA VIDIG VIOPEN PD Tstg Rating -0.3 to 15 -0.3 to 7 -0.3 to VCC + 0.3 -0.3 to VDD + 0.3 10 250 -40 to 125 Unit V V V V V mW C
Recommended Operating Conditions
GND = 0V
Parameter Supply voltage range (analog) Supply voltage range (digital) Operating temperature range Symbol VCC VDD Topr Rating 5 to 13 4.5 to 5.5 -20 to 85 Unit V V C
NIPPON PRECISION CIRCUITS--4
QS7785PF/CF
DC Characteristics
VCC = 9V, VDD = 5V, GND = 0V, Ta = 25C
Rating Parameter Symbol ZAIN1 ZAIN2 Reference voltage output HIGH-level input voltage LOW-level input voltage Input leakage current VREFOUT VIH VIL ILEAK IILOPD LOW-level output voltage Supply voltage (analog) Supply voltage (digital) Current consumption (analog) Current consumption (digital) Standby current (analog) VOL VCC VDD ICC IDD ICCSAVE Digital inputs, VDD input voltage SDA, SCL, 10V input voltage ACK signal output from SDA, 3mA sink current LIN, RIN CIN Condition min 16 8 - 0.7VDD - -3 -3 0 5 4.5 - - - Analog input impedance typ 20 10 VCC/2 - - - - - - - 6 0.3 0.1 max 24 12 - - 0.3VDD 3 A 3 0.4 13 5.5 8 0.5 0.2 V V V mA mA mA k V V V Unit
Noise and THD Characteristics
VCC = 9V, VDD = 5V, GND = 0V, Ta = 25C
Rating Parameter Symbol Condition min Bypass noise voltage Qsurround noise voltage (front) Qsurround noise voltage (surround) NBYP NQSF NQSR BYP = HIGH, SUR = MONO = SP = LOW, "A"-wgt, FLOUT, FROUT SUR = SP = HIGH, BYP = MONO = LOW, "A"-wgt, FLOUT, FROUT SUR = SP = HIGH, BYP = MONO = LOW, "A"-wgt, SLOUT, SROUT BYP = SUR = HIGH, MONO = SP = LOW, LIN = RIN = 1VRMS, f = 1kHz, FLOUT, FROUT, SLOUT, SROUT BYP = LOW, SUR = MONO = SP = HIGH, LIN = RIN = 1VRMS, f = 1kHz, FLOUT, FROUT, SLOUT, SROUT - - - typ 10 20 15 max 20 40 30 VRMS VRMS VRMS Unit
Bypass total harmonic distortion
THDB
-
-
0.1
%
Qsurround mono total harmonic distortion
THDQM
-
-
0.1
%
NIPPON PRECISION CIRCUITS--5
QS7785PF/CF
AC Characteristics
VCC = 9V, VDD = 5V, GND = 0V, Ta = 25C
Rating Parameter Symbol Condition min Bypass-mode maximum input voltage Qsurround enhanced-mode maximum input voltage Qsurround-mode maximum input voltage (surround speakers on) Mono/stereo conversion enhanced mode maximum input voltage Mono/stereo conversion mode maximum input voltage (surround speakers on) Bypass gain Bypass gain (surround speakers on) Qsurround mode gain Qsurround mode crosstalk gain Qsurround mode gain (surround) Qsurround mode crosstalk gain (surround) Qsurround enhanced mode gain Qsurround enhanced mode crosstalk gain Mono/stereo conversion mode leftchannel gain Mono/stereo conversion mode rightchannel gain Mono/stereo conversion enhanced mode left-channel gain Mono/stereo conversion enhanced mode right-channel gain Mono/stereo conversion mode surround left-channel gain Mono/stereo conversion mode surround right-channel gain SCL clock pulse period SCL clock HIGH-level pulsewidth SCL clock LOW-level pulsewidth SDA setup time SDA hold time STRB setup time STRB pulsewidth STRB hold time VB VQ+ VQS VM+ BYP = SUR = HIGH, MONO = SP = LOW, LIN = RIN, f = 1kHz BYP = MONO = SUR = LOW, SP = HIGH, LIN = RIN, f = 1kHz BYP = MONO = SP = LOW, SUR = HIGH, LIN = RIN, f = 1kHz BYP = SUR = LOW, MONO = SP = HIGH, LIN = RIN, f = 1kHz BYP = SP = LOW, MONO = SUR = HIGH, LIN = RIN, f = 1kHz BYP = HIGH, MONO = SUR = SP = LOW, LIN to FLOUT, RIN to FROUT, f = 1kHz BYP = SUR = HIGH, MONO = SP = LOW, LIN to SLOUT, RIN to SROUT, f = 1kHz BYP = MONO = SUR = SP = LOW, LIN to FLOUT, RIN to FROUT, f = 1kHz BYP = MONO = SUR = SP = LOW, LIN to FROUT, RIN to FLOUT, f = 1kHz BYP = MONO = SP = LOW, SUR = HIGH, LIN to SLOUT, RIN to SROUT, f = 1kHz BYP = MONO = SP = LOW, SUR = HIGH, LIN to SROUT, RIN to SLOUT, f = 1kHz BYP = MONO = SUR = LOW, SP = HIGH, LIN to FLOUT, RIN to FROUT, f = 1kHz BYP = MONO = SUR = LOW, SP = HIGH, LIN to FROUT, RIN to FLOUT, f = 1kHz BYP = SUR = SP = LOW, MONO = HIGH, LIN = RIN, FLOUT, f = 1kHz BYP = SUR = SP = LOW, MONO = HIGH, LIN = RIN, FROUT, f = 1kHz BYP = SUR = LOW, MONO = SP = HIGH, LIN = RIN, FLOUT, f = 1kHz BYP = SUR = LOW, MONO = SP = HIGH, LIN = RIN, FROUT, f = 1kHz BYP = SP = LOW, MONO = SUR = HIGH, LIN = RIN, SLOUT, f = 1kHz BYP = SP = LOW, MONO = SUR = HIGH, LIN = RIN, SROUT, f = 1kHz QS7785PF QS7785PF QS7785PF QS7785PF QS7785PF QS7785PF QS7785PF QS7785PF 1.7 1.8 1.3 0.8 typ 2.3 2.4 1.7 1.0 max - - - - VRMS VRMS VRMS VRMS Unit
VMS
0.8
1.0
-
VRMS
GBYP1 GBYP2 GQ GQX GQS GQXS GQ+ GQX+ GML GMR GML+ GMR+ GMSL GMSR t0 t1 t2 t3 t4 t5 t6 t7
-2 -2 3.9 -1.5 -2.3 -1.9 4.7 1.3 2.6 3.6 2.4 3.3 -3.8 -1.6 100 40 40 15 30 50 100 50
0 0 5.9 0.5 -0.3 0.1 6.7 3.3 4.6 5.6 4.4 5.3 -1.8 0.4 - - - - - - - -
2 2 7.9 2.5 1.7 2.1 8.7 5.3 6.6 7.6 6.4 7.3 0.2 2.4 - - - - - - - -
dB dB dB dB dB dB dB dB dB dB dB dB dB dB ns ns ns ns ns ns ns ns
NIPPON PRECISION CIRCUITS--6
QS7785PF/CF
Rating Parameter SCL hold time (I2C) SCL setup time (I2C) SDA hold time (I2C) SDA setup time (I2C) SCL clock HIGH-level pulsewidth (I2C) SCL clock LOW-level pulsewidth (I2C) SCL rise time (I2C) SCL fall time (I2C) Symbol tHD:STA tSU:STO tHD:DAT tSU:DAT tHIGH tLOW tr tf QS7785CF QS7785CF QS7785CF QS7785CF QS7785CF QS7785CF QS7785CF QS7785CF Condition min 4.0 4.0 5.0 250 4.0 4.7 - - typ - - - - - - - - max - - - - - - 1000 300 s s s ns s s ns ns Unit
Serial Interface Timing
3-wire (QS7785PF) timing
SDA
BYP
SUR
SP
MONO
AC
BASS
MUTE
PSAVE
SCL
t3
STRB
t4
t1 t0
t2 t5
t6
t7
Pin SDA SCL STRB Data signal. Sets mode settings. See "Operating Modes." Clock signal. Data is read on the rising edge.
Description
Strobe signal. Mode switches occur on the rising edge of this signal.
I2C 2-wire (QS7785CF) timing
I C address is {AD6 - AD0} = {1011011}
SDA AD6 AD0
2
BYP
SUR
SP
MONO
AC
BASS
MUTE
PSAVE
tHD:STA
SCL
tr
tf
tSU:DAT
tSU:STO
tHIGH
tLOW
tHD:DAT
Pin SDA SCL
Description Data signal. Sets slave address and mode settings. Address value, {1011011}, is shown in the figure above. See "Operating Modes." Clock signal. Data is read on the rising edge.
NIPPON PRECISION CIRCUITS--7
QS7785PF/CF
FUNCTIONAL DESCRIPTION
Operating Modes
The QS7785PF/CF operating mode can be controlled over either a parallel interface (P/S = HIGH) or one of two serial interfaces (P/S = LOW). The Output mode
Control pins/SDA signal No. 1 2 Stereo only 3 4 5 6 Mono only 7 8 9 10 11 12 Stereo only Stereo/Mono 0 0 1 1 1 1 1 1 0 0 1 1 1 1 0 1 0 1 0 1 x x x x 0 0 0 0 0 0 1 1 1 1 0 0 0 1 0 1 Stereo Q Stereo Q+ Mono Stereo Q Mono Stereo Q+ Mono Stereo Q Mono Stereo Q+ Stereo bypass Stereo bypass - Stereo bypass Stereo Q1 Stereo Q1 - - Mono Stereo Q1 Mono Stereo Q1 - Stereo bypass Stereo bypass Stereo Q1 Input signals BYP 0 0 MONO 0 0 SUR 0 0 SP 0 1 FROUT/FLOUT Stereo Q Stereo Q+ SROUT/SLOUT - - Output signals1
operating mode, control pins and SDA signal relationship is shown in the table below. Refer to "Serial Interface Timing" for the SDA signal format.
1. - (dash) = no output signal. x = indicates don't care. 1 = HIGH, 0 = LOW
Output signal description
Output signal Stereo Q Stereo Q+ Stereo Q1 Mono Stereo Q Mono Stereo Q+ Stereo bypass Description Mixed front-channel Qsurround processed signal and input stereo signal output Same as Stereo Q with increased Qsurround signal component and reduced input stereo signal component. Mixed surround-channel Qsurround processed signal and input stereo signal output. Mono signal converted to virtual stereo signal, and then processed in the same way as Stereo Q signals. Mono signal converted to virtual stereo signal, and then processed in the same way as Stereo Q+ signals. Input stereo signal is output as-is without processing.
Mono signals should be input on both LIN and RIN. In output mode 1, the output signal is a mixed signal comprising the front-channel Qsurround processed signal and the input stereo signal, that is output on the 2-channel front speakers only. In output mode 2, the signal path is the same as in output mode 1, but the surround effect is enhanced by increasing the component of the Qsurround processed signal and reducing the component of the input stereo signal. In output modes 3 and 4, both the front speakers and surround speakers are used to form a 4-channel sys-
tem for a rich surround space. The front-channel signal is the same as in output modes 1 and 2. The surround-channel signal is a mixed signal comprising an enhanced surround effect Qsurround processed signal and the input stereo signal. In output modes 5 to 8, the input signal is a mono signal. The mono signal is first converted to a virtual stereo signal and then processed in the same way as in output modes 1 to 4, respectively. In modes 5 and 6, the surround signal is output on 2-channel front speakers only. In modes 7 and 8, the surround signals are output on 4-channel front and surround speakers.
NIPPON PRECISION CIRCUITS--8
QS7785PF/CF In output modes 9 to 11, the input stereo signal is output to the speakers without processing. The bypass function works for both stereo and mono input signals, and is used to listen to the original signals. In mode 9, the stereo signal is output on front speakers only. In mode 10, the stereo signal is output Center signal output
Control pins/SDA signal1 BYP x x 1. - (dash) = no output signal. x = indicates don't care. 1 = HIGH, 0 = LOW MONO x x SUR x x SP x x AC 0 1 Output signal COUT - (RIN + LIN) / 2
on both front and surround speakers. In mode 11, the stereo signal is output on surround speakers only. In output mode 12, the input stereo signal is output on front speakers, and a surround effect enhanced signal is output on the surround speakers.
The center signal is output on COUT. See "Center Control." Bass boost mode
Control pins/SDA signal1 BYP x x MONO x x SUR x x SP x x AC x x BASS 0 1 FROUT/FLOUT Bass boost OFF Bass boost ON Output signal SROUT/SLOUT Bass boost OFF Bass boost ON COUT Bass boost OFF Bass boost ON
1. x = indicates don't care. 1 = HIGH, 0 = LOW
The bass boost function is used to enhance the bass frequency component. See "Bass Boost." Mute and power save
Control pins/SDA signal1 BYP x x x MONO x x x SUR x x x SP x x x AC x x x BASS x x x MUTE 0 1 1 PSAVE 0 0 1 FROUT/FLOUT Available - - Output signal SROUT/SLOUT Available - - COUT Available - -
1. - (dash) = no output signal. x = indicates don't care. 1 = HIGH, 0 = LOW
When PSAVE is HIGH, the analog stages of the device are turned OFF to save power. When MUTE is HIGH, all outputs are muted.
NIPPON PRECISION CIRCUITS--9
QS7785PF/CF
Speaker Arrangement
The QS7785PF/CF supports the following speaker arrangements.
37 RIN 38 LIN
SROUT 24 FROUT 26 CIN 21 COUT 22 FLOUT 25 SLOUT 23 Front Speakers Rear Speakers
37 RIN 38 LIN
SROUT 24 FROUT 26 CIN 21 COUT 22 FLOUT 25 SLOUT 23
Type A. Two front speakers in front and two surround speakers in rear
Type B. Front speakers and surround speakers in front
37 RIN 38 LIN
SROUT 24 FROUT 26 CIN 21 COUT 22 FLOUT 25 SLOUT 23
37 RIN 38 LIN
SROUT 24 FROUT 26 CIN 21 COUT 22 FLOUT 25 SLOUT 23
Type C. Front speakers and surround speakers in front with actual center speaker
Type D. Front speakers and surround speakers in front with center
Type A The front speakers are placed in front and the surround speakers are placed behind the audience to create a full rich enhanced space. Since the output signal for each channel has undergone Qsurround processing, the audio enhancement can be reduced to an adequate level even for television and similar signals where the left and right channels are located close to each other. Type B The front speakers and surround speakers are both placed in front of the audience, perhaps because it is not possible to place speakers behind the audience. If the surround speakers are turned to face outwards, to spread the surround signal, the surround effect can be obtained.
Type C A center speaker can be added in the center to reproduce vocal and speech signals for easy listening. The center signal is output on COUT. The signal is comprised of LIN and RIN signals, producing a sound image in the center. Type D If a center speaker is not available or not required, COUT can be connected to CIN using a resistor and the center signal is then added to the front-channel signal. The presence of the center signal added to the front channels reproduces the center signal sound image with virtually the same effect as that obtained using a center speaker. The connection using a resistor can be utilized for voice and similar fixed-band signals. See "Center Control" for a description of the method.
NIPPON PRECISION CIRCUITS--10
QS7785PF/CF
Center Control
The center signal output on COUT is enabled when AC is HIGH. This section describes the output function whereby fixed frequency sound sources, such as vocal and speech signals, can be output on the center signal. As mentioned for "Type C" and "Type D" speaker arrangements, the center signal can be output by direct connection to a speaker or by adding the signal to the front-channel output using a resistor connection between CIN and COUT. Using a center speaker When using a speaker, a capacitor Ca can be connected between LPC and COUT, forming a lowpass filter. The -3dB cutoff frequency of the filter is given by the following equation. 1 f = -------------------------2Ca x R1 Frequencies higher than voice tones are cut from the signal sent to the center speaker for clear reproduction of voice-band signals. Adding to the front-channel output With this connection, the bass frequency components can be removed from a signal. Capacitors Ca and Cb and resistor Ra can be connected between CIN and COUT to form a highpass filter. The -3dB cutoff frequency of the filter is given by the following equation. 1 f = --------------------------------------2Cb ( Ra + R2 ) The input signal on CIN is added equally to both front-channel outputs FLOUT and FROUT. Frequencies lower than voice tones are cut from the signal added to the front-channel outputs for clear reproduction of voice-band signals.
Close when AC=H Open when AC=L LPC R1:20k
VREFOUT Close when MUTE=H Open when MUTE=L R3:10k Ca Ra:10k CIN Cb:0.082F FROUT Front Right Speaker Cnter Speaker FLOUT
20 22
COUT
26
10k 10k 10k
21
R2:10k 10k
25
Front Left Speaker
Center output connection
Gain -6dB 3dB GC
V(COUT)/V(RIN)@V(LIN)=0 3dB 1 1 fH= 2Cb(Ra+R2) 2CaR1 R3 ( Ra+R2 )-6dB
fL=
GC=20 log V(FROUT) or V(FLOUT) fL fH Freq.
Center output frequency response
Note: Internal resistance value, R1 and R2, may vary 15%.
NIPPON PRECISION CIRCUITS--11
QS7785PF/CF
Bass Boost
With a signal input connected to BASC1 and BASC2, a bass boost function can be implemented. When BASS is HIGH, resistors RA and RB and capacitor C are connected to form a lowpass filter. The lowpass filter signal and the original signal (RIN, LIN) are combined to boost bass frequencies.
RIN /LIN
+
37
RA=10k C:0.15F RB:10k
R1:20k
R2:20k To Internal
36
VREFOUT Close when BASS=H Open when BASS=L
BASC1 /BASC2
Bass boost connection (Gb = 6dB, fC = 300Hz) .
Gain Gb=20 log 1+ Gb 1+ fC=
(
R1 RA+RB
)
R1 RA+RB RA RB 2C RA+RB
- 1 2 log 1+ R1 RA+RB 1+2 RA+RB R1
(
)
0dB fL fC fH Freq.
fL=fC 10
fH=fC 10
1 2
log 1+
R1 RA+RB 1+2 RA+RB R1
(
)
Bass boost frequency response
NIPPON PRECISION CIRCUITS--12
QS7785PF/CF
TYPICAL APPLICATIONS
Parallel Interface
5 to 13V 0.01F 0.01F 3300pF 3300pF
10k
10k BASC1 36 0.15F
4.7F 4.7F FROUT 26 FLOUT 25
QXAC1 35
QXAC2 34
QXAC3 33
QXAC4 32
VCC 31
QXBC1 30
QXBC2 29
QXBC3 28
4.7F Signal In 4.7F
QXBC4 27
RIN 10k
37
24 23
SROUT SLOUT 4.7F 4.7F 4.7F 10F
Signal Out
LIN 38 10k
39 BASC2
0.15F 0.22F 0.022F 2700pF 0.082F 0.012F 1000pF
COUT 22 CIN 21 LPC 20 VREFIN 19 N.C. 18 VREFOUT 17 PSAVE 16 10F
40 MSC6 41 MSC5 42 MSC4 43 MSC3 44 MSC2 45 MSC1 9 SP(STRB) 46 QXCC1 3 QXDC2 4 QXDC3 5 QXDC4 2 QXDC1 1 QXCC4 6 GND 7 VDD 8 P/S 10 MONO
11 AC
8200pF QXCC2 47 QXCC3 48 8200pF
12 BYP(SDA)
15 14 13
MUTE BASS
8200pF 8200pF
47k
5V
A capacitor for decoupling should be connected between supply and ground.
NIPPON PRECISION CIRCUITS--13
SUR(SCL)
QS7785PF/CF
Serial Interface
QS7785PF
5 to 13V 0.01F 0.01F 3300pF 3300pF
10k
10k BASC1 36 0.15F
4.7F 4.7F FROUT 26 FLOUT 25
QXAC1 35
QXAC2 34
QXAC3 33
QXAC4 32
VCC 31
QXBC1 30
QXBC2 29
QXBC3 28
4.7F Signal In 4.7F
QXBC4 27
RIN 10k
37
24 23
SROUT SLOUT 4.7F 4.7F 4.7F 10F
Signal Out
LIN 38 10k
39 BASC2
0.15F 0.22F 0.022F 2700pF 0.082F 0.012F 1000pF
COUT 22 CIN 21 LPC 20 VREFIN 19 N.C. 18 VREFOUT 17 PSAVE 16 10F
40 MSC6 41 MSC5 42 MSC4 43 MSC3 44 MSC2 45 MSC1 9 SP(STRB) 46 QXCC1 3 QXDC2 4 QXDC3 5 QXDC4 2 QXDC1 1 QXCC4 6 GND 7 VDD 8 P/S 10 MONO
11 AC
8200pF QXCC2 47 QXCC3 48 8200pF
12 BYP(SDA)
15 14 13
MUTE BASS SUR(SCL) SCL SDA
8200pF 8200pF
STRB
5V
QS7785PF
5 to 13V 0.01F 0.01F 3300pF 3300pF
10k
10k BASC1 36 0.15F
4.7F 4.7F FROUT 26 FLOUT 25
QXAC1 35
QXAC2 34
QXAC3 33
QXAC4 32
VCC 31
QXBC1 30
QXBC2 29
QXBC3 28
4.7F Signal In 4.7F
QXBC4 27
RIN 10k
37
24 23
SROUT SLOUT 4.7F 4.7F 4.7F 10F
Signal Out
LIN 38 10k
39 BASC2
0.15F 0.22F 0.022F 2700pF 0.082F 0.012F 1000pF
COUT 22 CIN 21 LPC 20 VREFIN 19 N.C. 18 VREFOUT 17 PSAVE 16 10F
40 MSC6 41 MSC5 42 MSC4 43 MSC3 44 MSC2 45 MSC1 46 QXCC1 3 QXDC2 4 QXDC3 5 QXDC4 2 QXDC1 1 QXCC4 10 MONO 6 GND 7 VDD 8 P/S 11 AC 9 SP
8200pF QXCC2 47 QXCC3 48 8200pF
12 BYP(SDA)
15 14 13
MUTE BASS SUR(SCL) SCL SDA
8200pF 8200pF
5V
A capacitor for decoupling should be connected between supply and ground.
NIPPON PRECISION CIRCUITS--14
QS7785PF/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 for 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 export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: sales@npc.co.jp
NC9818BE 2000.11
NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS--15

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