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BH3874AKS2
Audio ICs
Sound processor IC
BH3874AKS2
The BH3874AKS2 is a sound control IC for mini-component stereo. 4-ch input selector, vocal fade, volume, surround, 5band graphic equalizer, dynamic bass, and 5-band spectrum analyzer are integrated into a single chip. Soft switch can reduce the switching noise occurred when volume, vocal fade, surround, and dynamic bass are switched.
!Applications Mini component stereo, Micro component stereo, CD radio cassette players, and TV.
!Features 1) A single chip IC integrates all functions of volume, tone control, and spectrum analyzer. 2) Soft switching can reduce the noise occured when volume, mode selector, surround, dynamic bass, and gain of graphic equalizer are switched. 3) 4-ch input selector, mode selector, volume, surround, graphic equalizer, dynamic bass, and spectrum analyzer. 4) Built-in matrix surround, pseudo stereo circuit, and band pass filter for spectrum analyzer. 5) Low distortion and low noise due to the BiCMOS process adopting resistance ladder volume. 6) Filters of dynamic bass and biamp can be set freely by the combination of LPF and HPF.
!Absolute maximum ratings (Ta=25C)
Parameter Power supply voltage Power dissipation Operating temperature range Storage temperature range Symbol VCC Pd Topr Tstg Limits 10.0 1200 -12 to +85 -55 to +125 Unit V mW C C
Reduced by 12mW for each increase in Ta of 1C over 25C. A standard board, 70x70x1.6mm, shall be mounted.
!Recommended operating conditions (Ta=25C)
Parameter Power supply voltage Symbol VCC Min. 8.0 Typ. - Max. 9.5 Unit V
BH3874AKS2
Audio ICs
!Block diagram
FILTER STEPC
33
BASS5
OUTR
OUTL
GND
CAP
SCK
35
VCC
30
28
54
32
27
29
31
34
VCC
1 2 VCC
+
FILTER
+
49
CONTROL
-
+
DIGTAL
+ - + -
SI
BASS4 BASS3 BASS2 BASS1
25 24 23
ALC
26
ALCC
50
ALCR
HPFL3 19
VCA HPF
22
HPFR3 HPFR2 HPFR1
HPFL2 18 HPFL1 17
HPF
21 20
-30dB~-
+
F5L F4L2 F4L1 F3L2 F3L1 F2L2 F2L1 F1L2 F1L1 DPLL2 DPLL1 DPLR2 DPLR1
15 12
11 8 7 4 3 64 63
F5R F4R2 F4R1 10 F3R2 9 F3R1 6 F2R2 5 F2R1 2 F1R2 1 F1R1 39 BPOUT
16 14 13
5 BAND EQ
58 57 60 59 +
MPX
+
+
5 BAND EQ
+
+
C B 36 A
38 37
-
EFFECT
DET
DET
DET
DET
10.5kHz 3.4kHz
PS2 PS1
62
PS PS
L-R L+R
105Hz
340Hz
61
0~30dB
+
-
RECL 51
19dB
+
+
11dB
11dB
22k
+ -
+
+
10k
10k
+
+
+
1kHz
DET
+
+
+
+
-
40
BPNF
+
-
+
-
MIC 56 VFC2 55 VFC1 53 MODE SELECTOR
-9dB
47
45
43
41
42
44
46
48
-9dB
52
INLD
INLC
INRC
INRD
RECR
INLB
INLA
INRA
INRB
BH3874AKS2
Audio ICs
!Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Pin name F1R1 F1R2 F2L1 F2L2 F2R1 F2R2 F3L1 F3L2 F3R1 F3R2 F4L1 F4L2 F4R1 F4R2 F5L F5R HPFL1 HPFL2 HPFL3 HPFR1 HPFR2 HPFR3 BASS1 BASS2 BASS3 BASS4 BASS5 FILTER CAP VCC OUTR OUTL Function Rch GREQ f1 filter setting pin Rch GREQ f1 filter setting pin Lch GREQ f2 filter setting pin Lch GREQ f2 filter setting pin Rch GREQ f2 filter setting pin Rch GREQ f2 filter setting pin Lch GREQ f3 filter setting pin Lch GREQ f3 filter setting pin Rch GREQ f3 filter setting pin Rch GREQ f3 filter setting pin Lch GREQ f4 filter setting pin Lch GREQ f4 filter setting pin Rch GREQ f4 filter setting pin Rch GREQ f4 filter setting pin Lch GREQ f5 filter setting pin Rch GREQ f5 filter setting pin Lch High-pass filter setting pin Lch High-pass filter setting pin Lch High-pass filter setting pin Rch High-pass filter setting pin Rch High-pass filter setting pin Rch High-pass filter setting pin Dynamic bass filter setting pin Dynamic bass filter setting pin Dynamic bass filter setting pin Dynamic bass filter setting pin Biamp output pin VCC/2 Pin ALC trap frequency setting pin Power supply pin Rch Sound signal output pin Lch Sound signal output pin Pin No. 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Pin name STEPC SI SCK A B C BPOUT BPNF INLA INRA INLB INRB INLC INRC INLD INRD ALCC ALCR RECL RECR VFC1 GND VFC2 MIC DPLL1 DPLL2 DPLR1 DPLR2 PS1 PS2 F1L1 F1L2 Function Time constant attachment for switching shock protection Serial data latch receiving pin Serial clock receiving pin Parallel data receiving pin Parallel data receiving pin Parallel data receiving pin Output pin for spectrum analyzer Spectrum analyzer level setting pin Lch Sound signal input pin A Rch Sound signal input pin A Lch Sound signal input pin B Rch Sound signal input pin B Lch Sound signal input pin C Rch Sound signal input pin C Lch Sound signal input pin D Rch Sound signal input pin D Time constant of ALC setting pin ALC level setting pin Lch RECOUT output pin Rch RECOUT output pin Vocal fade filter setting pin Ground pin Vocal fade filter setting pin Input pin for microphone Lch Output pin for DPL Lch Input pin for DPL Rch Output pin for DPL Rch Input pin for DPL Surround setting pin Surround setting pin Lch GREQ f1 Filter Setting Pin Lch GREQ f1 Filter Setting Pin
BH3874AKS2
Audio ICs
!Input / output circuits
Pin No. Pin name Pin voltage
VCC
Equivalent circuit
Pin description
41 42 43 44 45 46
INLA INRA INLB INRB INLC INRC
VCC/2
50k
A pin for inputting a sound signal. It is suitable for input of CD, MD, tuner and tape. The input impedance is 50k (upon typical setting).
GND
54
GND
-
VCC
-
A ground pin
17.5k 35k
53
VFC1
VCC/2
35k
A pin for setting vocal fade frequency characteristic.
GND
VCC
17.5k 35k
55
VFC2
VCC/2
35k
A pin for setting vocal fade frequency characteristic.
GND
VCC
47
INLD
VCC/2
48 INRD
GND
12.9k 7.1k
A pin for inputting a sound signal. The input impedance is 20k (upon typical setting). It is possible to set 0dB or -9dB.
VCC
51
RECL
VCC/2
52 RECR
GND
A pin for outputting a sound signal for recording.
BH3874AKS2
Audio ICs
Pin No. Pin name Pin voltage
VCC
Equivalent circuit
Pin description
63 1 7 9
F1L1 F1R1
4k
4k 10k
VCC/2
F3L1 F3R1
GND
16k
A pin for setting graphic equalizer frequency characteristic.
64 2 8 10
F1L2 F1R2
VCC
VCC/2
F3L2 F3R2
GND
16k
A pin for setting graphic equalizer frequency characteristic.
VCC
15
F5L
17k
VCC/2
16 F5R
GND
17k
A pin for setting graphic equalizer frequency characteristic.
VCC
56
MIC
VCC/2
10k
A pin for inputting a microphone signal. The input impedance is 10k (upon typical setting).
GND
3 5 11 13
F2L1 F2R1
VCC
3k
4k 10k
VCC/2
F4L1 F4R1
GND
12k
A pin for setting graphic equalizer frequency characteristic.
4 6 12 14
F2L2 F2R2
VCC
VCC/2
F4L2 F4R2
GND
12k
A pin for setting graphic equalizer frequency characteristic.
BH3874AKS2
Audio ICs
Pin No.
30
Pin name
VCC
Pin voltage -
VCC
Equivalent circuit -
Pin description
Power supply pin.
57
DPLL1
VCC/2
59 DPLR1
GND
A pin for outputting DPL.
VCC
58
DPLL2
7k
VCC/2
60 DPLR2
GND
A pin for inputting DPL.
VCC
61
PS1
15.4k
VCC/2
62 PS2
15.4k
15.4k
A pin for setting surround phase shifter.
GND
VCC
17
HPFL1
VCC/2
20 HPFR1
GND
20k
A pin for setting cut-off frequency of HPF.
VCC
18
HPFL2
VCC/2
21 HPFR2
GND
A pin for setting cut-off frequency of HPF.
BH3874AKS2
Audio ICs
Pin No. Pin name Pin voltage
VCC
Equivalent circuit
Pin description
19
HPFL3
VCC/2
22 HPFR3
GND
A pin for setting cut-off frequency of HPF.
VCC
42k 20k 20k
50
ALCR
-
48k
A pin for setting threshold to set the ALC.
GND
VCC
23
BASS1
VCC/2
25 BASS3
GND
A pin for setting Dynamic bass (Biamp) frequency characteristic.
VCC
24
BASS2
VCC/2
26 BASS4
GND
A pin for setting Dynamic bass (Biamp) frequency characteristic.
VCC
27
BASS5
VCC/2
A pin for outputting Biamp.
GND
BH3874AKS2
Audio ICs
Pin No. Pin name Pin voltage
VCC
Equivalent circuit
Pin description
28
FILTER
VCC/2
A pin for inputting VCC/2 from outside of IC.
GND
54
GND
-
VCC
-
A ground pin.
32
OUTL
VCC/2
31 OUTR
GND
A pin for outputting a sound signal.
VCC
29
CAP
VCC/2
15k
30k
A pin for specifying trap frequency of ALC.
GND
VCC
1k
49
ALCC
0
A pin for setting attack time and release time of ALC.
GND
VCC
Vref
35
SCK
-
A pin for inputting a signal clock.
GND
BH3874AKS2
Audio ICs
Pin No. Pin name Pin voltage
VCC
Vref
Equivalent circuit
Pin description
34
SI
-
A pin for inputting a serial data.
GND
VCC
33
STEPC
-
Time constant attachment for switching shock protection.
GND
36
A
VCC
Vref
37
B
-
A pin for inputting a parallel data.
38
C
GND
VCC
39
BPOUT
-
30k
A pin for outputting a spectrum analyzer B.P.F..
GND
VCC
22k
40
BPNF
VCC/2
A pin for adjusting gain of non-inverting amplifier in spectrum analyzer.
GND
BH3874AKS2
Audio ICs
!Electrical characteristics (Unless otherwise noted, Ta=25C, VCC=9V, f=1kHz, Rg=600, RL=10k, VIN=300mVrms, INPUT SELECTOR=Ach, MODE SELECTOR=Through, VOLUME=0dB, SURROUND=0dB, GRAPHIC EQUALIZER=0dB, DYNAMIC BASS=0dB, SPECTRUM ANALYZER=RESET)
Parameter Circuit current Maximum input voltage Maximum output voltage Voltage gain Total harmonic distortion rate Output noise voltage Residual output noise voltage Cross talk Channel balance Symbol IQ VIM VOM GV THD VNO VMNO CT CB Min. - 0.4 2.0 9 - - - 70 -1.5 Typ. 40 0.7 2.5 11 0.01 35 5 80 0 Max. 60 - - 13 0.05 50 20 - 1.5 Unit mA Vrms Vrms dB % VIN=150mVrms, 400Hz-30kHz BPF Conditions No signal, after power on. THD=1% THD=1% Data setting Switch control table Input Measurement pin [1] [2] [3] [4] [4] [5] [5] [6] [7] [8] SW SW SW SW SW pin 1/4 2/5 3/6 7 8 - 41 42 41 42 41 42 41 42 41 42 41 42 41 42 - 41 42 43 44 45 46 47 48 DIN AUDIO 41 42 41,42 41,42 VIN=100mVrms fIN=100Hz, 300Hz, 1kHz, 3kHz, or 10kHz VIN=100mVrms fIN=100Hz, 300Hz, 1kHz, 3kHz, or 10kHz VIN=100mVrms fIN=100Hz, 300Hz, 1kHz, 3kHz, or 10kHz VIN=100mVrms fIN=100Hz, 300Hz, 1kHz, 3kHz, or 10kHz Lch reference VIN=40mVrms, fIN=75Hz 49pin=GND Lch reference DIN AUDIO DIN AUDIO VIN=100mVrms VIN=100mVrms DIN AUDIO 30 32 31 32 31 32 31 32 31 32 31 32 31 31 32 - 41 42 43 44 45 46 47 48 32 31 32 31 - - - - - - - - - - 1 1 1 1 1 1 1 1 1 1 1 1 2 2 1/2 - 1 1 1 1 1 - - 1/- - 2 2 2 2 2 2 2 2 - 1 1 1 1 1 1 1 1 -
00 05 03 04 0C 02 0A 06 81 07 00 05 03 04 0C 02 0A 06 81 07 00 05 03 04 0C 02 0A 06 81 07 00 05 03 04 0C 02 0A 06 81 07 00 15 03 04 0C 02 0A 06 89 07 00 15 03 04 0C 02 0A 06 89 07
Vrms Biamp=0dB, DIN AUDIO Vrms dB dB Rg=0, Volume=-, Biamp=0dB, DIN AUDIO Biamp=0dB, Rg=0, DIN AUDIO Lch reference
00 15 03 04 0C 02 0A 06 81 07 1/1 - - - - - - - - - - - 1 1 2 2 3 3 4 4 1 1
Selector A-C Input impedance
RIN
35
50
65
k
-
-
-
-
-
-
-
-
-
-
1
2
2
1
Selector D Input impedance Maximum attenuation Vocal fade suppression quantity Graphic equalizer boost gain set error (Set 2dB,4dB,6dB) Graphic equalizer boost gain set error (Set 8dB,10dB,12dB) Graphic equalizer cut gain set error (Set -2dB,-4dB,-6dB) Graphic equalizer cut gain set error (Set-8dB,-10dB,-12dB) Graphic equalizer channel balance Dynamic bass boost gain Dynamic bass boost channel balance Input separation Input mute attenuation
RIND ATTMAX GVF VGQBL
10 86 25 -2
20 95 30 0
30 - - 2
k dB dB dB
-
-
-
-
-
-
-
-
-
-
1 1 1
2 1 1
2 2 2
1 1 1
F8 05 03 04 0C 02 0A 06 81 07 00 25 03 04 0C 02 0A 06 81 07
41 42
32 31
VGQBH
-3
0
3
dB
74 04 00 05 03 04 04 04
0C 7C 0C 0C 0C
02 02 72 02 02
0A 0A 0A 7A 0A
06 06 06 81 07 06 76
1
1
1
2
1
VGQCL
-2
0
2
dB
41 42
32 31
VGQCL GQCB VBB VBCB CTIN VINMU GMIC VMICMU GREC
-3 -1.5 15 -1.5 80 80 17 80 9 80 -7 7
0 0 18 0 90 90 19 90 11 90 -9 9
3 1.5 21 1.5 - - 21 - 13 - -11 11
dB dB dB dB dB dB dB dB dB dB dB dB
E4 04 00 05 03 04 04 04 - - - -
0C EC 0C 0C 0C -
02 02 E2 02 02 -
0A 0A 0A EA 0A -
06 06 06 81 07 06 E6 - - -
1
1
1
2
1
- 41,42 41,42 - 41 42 41 42 56 56 41 42
- 32 31 - 51 52 32 31 32 31 32 31 51 52 51 52 32 31 32 31
- 1 - 1 1 1 1 1 1 4 1
- 1 - 1 1 2 2 1 1 1 1
- 1 - 1 1 - - 1 1 1 1
- 2 - 2 2 1 1 2 2 2 2
- 2 - 1 1 1 1 1 1 1 1
00 E5 03 04 0C 02 0A 06 81 07 - - - - - - - - - -
41 00 05 03 04 0C 02 0A 06 C1 07 61 00 05 03 04 0C 02 0A 06 01 07 00 05 03 04 0C 02 0A 06 81 07 00 15 03 04 0C 02 0A 06 81 07 00 05 03 04 0C 02 0A 06 81 07 00 0D 03 04 0C 02 0A 06 81 07 00 05 03 04 0C 02 0A 06 E1 07 00 05 1B 04 0C 02 0A 06 81 07
Microphone voltage gain Microphone mute attenuation RECOUT voltage gain
RECOUT mute attenuation VRECMU Selector D attenuation Surround maximum voltage gain D2ATT VSUMAX
DIN AUDIO
41 42 49 50
VIN=100mVrms fIN=10kHz
41 42
Design against radiation-proof is not made. VP-9690A (Average value detection, effective value display) DIN AUDIO filter by Matsushita Communication is used for measurement.
BH3874AKS2
Audio ICs
Parameter Symbol Min. 6.5 11.3 Typ. 8.5 13.3 Max. 10.5 15.3 Unit dB dB Conditions VIN=100mVrms fIN=680Hz VIN=100mVrms fIN=680Hz Data setting Switch control table Input Measurement pin [1] [2] [3] [4] [4] [5] [5] [6] [7] [8] SW SW SW SW SW pin 1/4 2/5 3/6 7 8
Simulated stereo maximum VMONL voltage gain Lch Simulated stereo maximum VMONR voltage gain Rch Spectrum analyzer maximum output level
41,42 41,42
32 31
00 05 1B 04 0C 02 0A 06 91 07
1
1
1
2
1
VMAX
4.0
4.8
-
V
VIN=-19dBV
41,42 41,42
39
47 C7 00 05 03 04 0C 02 0A 06 81 27 A7 67 47 C7 00 05 03 04 0C 02 0A 06 81 27 A7 67 47 C7 00 05 03 04 0C 02 0A 06 81 27 A7 67 00 15 03 04 0C 02 0A 06 81 07
1
1
1
2
1
Spectrum analyzer output offset voltage
VOS
0
30
200
mV
VIN=0Vrms
-
39
-
-
-
-
-
Spectrum analyzer standard output level
VST
0.65
1.35
1.7
V
VIN=-37dBV fIN=105Hz, 340Hz, 1kHz, 3.4kHz, or 10.5kHz VRR=100mVrms fRR=100Hz, DIN AUDIO
41,42 41,42
39
1
1
1
2
1
Ripple rejection
RR
31
-
-
dB
30
32 31
1
2
-
2
1
Design against radiation-proof is not made. VP-9690A (Average value detection, effective value display) DIN AUDIO filter by Matsushita Communication is used for measurement.
BH3874AKS2
Audio ICs
!Measurement circuit
51k 1 2 1 SW6 1 2 1 51k SW3
2
SW5
2
SW2
4
3
2
1
4
3
2
1
CLOCK
10 4.7 4.7 2.2 2.2 2.2 2.2 2.2 2.2 62k 9.1k
DATA
15k 10k 0.22
SW4
SW1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
LATCH
33
THD
INLB
INLD
INLC
INRB
INRD
INRC
INRA
INLA
SCK
SI
B
C
A
10 100k 1 2 SW8
BPOUT
STEPC
BPNF
10k
49 ALCC 50 ALCR 51 RECL
OUTL 32
10
THD
150k 10k 10
OUTR 31
10
10k VCC
VCC 30 CAP 29
0.1
52 RECR
10k 10
53 VFC1
0.1
FILTER 28
10 220 3.3k 68k
54 GND 55 VFC2
1 0.047
BASS5 27 BASS4 26
2 SW7
56 MIC
10
57 DPLL1
10
BH3874AKS2 (SQFPT64)
0.22
0.22
BASS3 25 BASS2 24 BASS1 23 HPFR3 22 HPFR2 21 HPFR1 20
0.068 22k 0.1 0.1
15k
58 DPLL2
DPL
10
59 DPLR1
10
15k 47k 0.068 0.068 47k
60 DPLR2
10
61 PS1
0.047
62 PS2
4700p 0.22
HPFL3 19 HPFL2 18 HPFL1 17
15k 47k 0.068 0.068 0.068 47k
63 F1L1
0.22
64 F1L2
F1R1
F1R2
F2R1
F2R2
F3R1
F3R2
F4R1
F4R2
F2L1
F2L2
F3L1
F3L2
F4L1
F4L2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0.0022
0.0022 0.22 0.22 0.1 0.1 0.1 0.1 0.022 0.022 0.022 0.022 0.01 0.01 0.01 0.01
Fig.1
Recommendable External Parts 1. Element marked with * Carbon-film resistor : 1% * Film capacitor : 1% * Ceramic capacitor : 1% 2. Unless specified particularly, use the following external parts: * Carbon-film resistor : 5% * Film capacitor : 20% * Electrolytic capacitor : 20%
Notes on wiring 1. GND shall be wired solidly. 2. Wiring pattern of SI and SCK shall be away from that of analog unit and cross talk shall not be acceptable. 3. Lines of SI and SCK shall not be parallel if possible. The lines shall be shielded, if they are adjacent to each other.
F5R
F5L
BH3874AKS2
Audio ICs
!Circuit operations Timing of Control Signal
SCK (CLOCK signal) 35pin
90% tw 10% tw
tsu
th
ts
tw(LATCH) 90%
34pin SI DATA signal LATCH signal
90% 10%
tw(DATA)
10%
Fig.2
DATA (SI) is read at a rising edge of CLOCK. DATA is fixed by the rising edge of LATCH. Be sure to set SCK and SI to Low after latching. When the CLOCK signal is High, it doesn't accept LATCH signal.
Constant of Timing Chart (Ta=25C)
Parameter "High" Input voltage "Middle" Input voltage "Low" Input voltage Clock width Data width Latch width Setup time (DATACLOCK) Hold time (CLOCKCLOCK) Setup time (DATA, CLOCKLATCH) Symbol VIH VIM VIL tw tw (DATA) tw (LATCH) tsu th ts Min. 3.3 1.8 -0.3 2.0 4.0 2.0 1.0 1.0 1.0 Typ. 5.0 2.0 0 - - - - - - Max. 6.0 2.4 1.2 - - - - - - Unit V V V s s s s s s
Serial signal SI is judging DATA and LATCH in the difference of the voltage level. In the application schematic, it is changing 0-5V 3 line serial data into the 2 line serial data at the voltage with the resistance and the diode of the external. We request enough examination, because there is a case where the voltage which is changed by the ability for the microcomputer to drive and the external parts.
BH3874AKS2
Audio ICs
When transmitting more than one piece of data at once, we request the following serial control transmission. (1) Timing of serial data and latch
DATA
8bit DATA 8bit DATA 8bit DATA 8bit DATA 8bit DATA 8bit DATA 8bit DATA 8bit DATA 8bit DATA 8bit DATA
[1]
[2] Cf. (2)
[3]
LATCH
DATA&LATCH

TIme
Fig.3
Parameter Latch width The time which transmits more than one piece of data at once The time which sends more than one piece of the following data after sending more than one pirce of data (When the capacitor of 33 pin is 0.22F.)
Time More than 2.0s Less than 2.5ms
More than 100ms
(2) About the order which transmits more than one piece of DATA at once When transmitting more than one piece of DATA including [1], [2] or [3] at once, transmit DATA of [1], [2] or [3] of the data format first. In case of transmitting some data from [1] until [8], transmit only necessary DATA in order from [1]. (3) About DATA needing the timing of (1) DATA needing the timing of (1) are DATA [1], [2] and [3]. Even if one data of DATA [1], [2] and [3] is transmitted, follow the timing of (1). In case of transmitting some data from [4] until [8], the timing of (1) need not be followed. In the case, there are no problems if the constant of timing chart in the preceding page is satisfied.
BH3874AKS2
Audio ICs
(4) Relation of the serial data and 33pin capacitor The interval of the data and the data can be more shortly set by changing the capacitor of 33pins. (Ex. When making the changing speed of VOLUME faster) The relation between the interval of the data and the data and the capacitor of 33pin is as follows.
33pin Capacitor 0.047F 0.1F 0.22F The interval of the data and the next data More than 25ms More than 50ms More than 100ms
Note: It is possible to do the interval of the data and the next data more shortly by changing 33pin capacitor into 0.047F. However, the switching sound becomes rather bigger than the switching sound of setting 0.1F about the switching sound of VOLUME, DBASS, SURROUND, MODE SELECTOR.
(5) Others If there is common impedance in GND of the IC, the switching sound something occurs by changing the mode. Wiring pattern of SI and SCK shall be away from that of analog unit and cross talk shall not be acceptable.
BH3874AKS2
Audio ICs
SERIAL CONTROL DATA FORMAT
D00 D01 D02 D03 D04 D05 D06 D07
[1]
VOLUME
0
0
0
D10
D11
D12
D13
D14 REC OUT
D15
D16
D17
[2]
MODE SELECTOR
MIC
1
0
1
D20
D21
D22
D23
D24
D25
D26
D27
[3]
DYNAMIC BASS / Biamp
SURROUND EFFECT
0
1
1
D30
D31
D32
D33
D34 GREQ 0 : f1 1 : f2
D35
D36
D37
[4]
GRAPHIC EQUALIZER f1 / f2
1
0
0
D40
D41
D42
D43
D44 GREQ 0 : f3 1 : f4
D45
D46
D47
[5]
GRAPHIC EQUALIZER f3 / f4
0
1
0
D50
D51
D52
D53
D54 DPL 0 : OFF 1 : ON
D55
D56
D57
[6]
GRAPHIC EQUALIZER f5
1
1
0
D60
D61
D62
D63 SURROUND / STEREO
D64 DYNAMIC BASS / Biamp D74
D65
D66
D67
[7]
INPUT SELECTOR
0
0
1
D70
D71
D72
D73
D75
D76
D77
[8]
SPECTRUM ANALYZER
1
1
1
Don't Care
As for functions of the and mark, measures to reduce step noise are done. Because the functions of no marks have no measures of step noise, please supply mute. As for the mark, it becomes a soft switch method. As for the mark, it takes measures to decrease DC offset voltage.
BH3874AKS2
Audio ICs
[1] VOLUME ATTENUATION
ATT quantity 0.0dB -2.0dB -4.0dB -6.0dB -8.0dB -10.0dB -12.0dB -14.0dB -16.0dB -18.0dB -20.0dB -22.0dB -24.0dB -26.0dB -28.0dB -30.0dB -32.0dB -34.0dB -36.0dB -38.0dB -40.0dB -44.0dB -48.0dB -52.0dB -56.0dB -60.0dB -64.0dB -68.0dB -72.0dB -76.0dB -82.0dB - D00 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 D01 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D02 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D03 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D04 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 D05 D06 D07
BH3874AKS2
Audio ICs
[2] MODE SELECTOR, MIC, REC OUT
MODE THROUGH THROUGH THROUGH THROUGH VOCAL FADE Lch MONAULAL Rch MONAULAL L+R D10 0 1 0 1 0 1 0 1 D11 0 0 1 1 0 0 1 1 D12 0 0 0 0 1 1 1 1 MIC 0 : ON 1 : MUTE REC OUT 0 : ON 1 : MUTE D13 D14 D15 D16 D17
1
0
1
Note : About input selector, mode selector is cleared when MUTE of the input selector is chosen. When MUTE of the input selector is canceled, choose the mode selector, too. The MUTE command of the input selector has priority over the command of the mode selector.
[3] Dynamic Bass / Biamp Effect, Surround Effect (a) Dynamic Bass / Biamp Effect The effect quantity in biamp is different from the value of the below table.
GAIN 0dB 0dB 3dB 6dB 9dB 12dB 15dB 18dB D20 0 1 0 1 0 1 0 1 D21 0 0 1 1 0 0 1 1 D22 0 0 0 0 1 1 1 1 Refer to the Surround Effect 0 1 1 D23 D24 D25 D26 D27
(b) Surround Effect The effect quantity in simulated stereo mode is different from the value of the below table.
GAIN 0dB 3dB 6dB 9dB Refer to the Dynamic Bass Effect D20 D21 D22 D23 0 1 0 1 D24 0 0 1 1 0 1 1 D25 D26 D27
Note : GAIN is the name given to the transfer data. Depending on the values of the external constant, the specified gain may not be output.
BH3874AKS2
Audio ICs
[4] Graphic Equalizer f1 / f2
GAIN +12dB +12dB +10dB +8dB +6dB +4dB +2dB 0dB 0dB -2dB -4dB -6dB -8dB -10dB -12dB -12dB D30 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 D31 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 D32 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 D33 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 GREQ
SELECT
D34
D35
D36
D37
0 : f1 1 : f2
1
0
0
Note : GAIN is the name given to the transfer data. Depending on the values of the external constant, the specified gain may not be output.
[5] Graphic Equalizer f3 / f4
GAIN +12dB +12dB +10dB +8dB +6dB +4dB +2dB 0dB 0dB -2dB -4dB -6dB -8dB -10dB -12dB -12dB D40 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 D41 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 D42 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 D43 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 GREQ
SELECT
D44
D45
D46
D47
0 : f3 1 : f4
0
1
0
Note : GAIN is the name given to the transfer data. Depending on the values of the external constant, the specified gain may not be output.
BH3874AKS2
Audio ICs
[6] Graphic Equalizer f5, DPL
GAIN +12dB +12dB +10dB +8dB +6dB +4dB +2dB 0dB 0dB -2dB -4dB -6dB -8dB -10dB -12dB -12dB D50 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 D51 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 D52 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 D53 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 DPL
SELECT
D54
D55
D56
D57
1
1
0
0 : OFF 1 : ON
Note : GAIN is the name given to the transfer data. Depending on the values of the external constant, the specified gain may not be output.
[7] Input Selector, Dynamic Bass / Biamp, Surround / Simulated stereo
INPUT MUTE INPUT-LA, INPUT-RA INPUT-LB, INPUT-RB INPUT-LC, INPUT-RC MUTE MUTE INPUT-LD1, INPUT-RD1 (0dB) INPUT-LD2, INPUT-RD2 (-9dB) D60 0 1 0 1 0 1 0 1 D61 0 0 1 1 0 0 1 1 D62 0 0 0 0 1 1 1 1 0 : Surround 0 : Dynamic 1 : Simulated Bass stereo 1 : Biamp 0 0 1 D63 D64 D65 D66 D67
[8] Spectrum Analyzer
FREQUENCY RESET RESET fo=105Hz fo=340Hz fo=1kHz fo=3.4kHz fo=10.5kHz Priority over parallel data D70 0 1 0 1 0 1 0 1 D71 0 0 1 1 0 0 1 1 D72 0 0 0 0 1 1 1 1
Don't Care
D73
D74
D75
D76
D77
1
1
1
BH3874AKS2
Audio ICs
PARALLEL CONTROL
A 36pin 0 0 0 0 1 1 1 1 B 37pin 0 0 1 1 0 0 1 1 C 38pin 0 1 0 1 0 1 0 1 BPOUT (39pin) RESET 105Hz 340Hz RESET 1kHz RESET 3.4kHz 10.5kHz
When serial control is done, a parallel control isn't received. When the serial control is "parallel priority", a parallel control on the left is received. When changing the frequency of spectrum analyzer, transmit the command of the following frequency after transmitting a reset command.
BH3874AKS2
Audio ICs
!Application example
LATCH CLOCK DATA
15k
10 4.7 4.7 2.2 2.2 2.2 2.2 2.2 2.2 9.1k 62k 10k 0.22
48
INRD
10
47
INLD
46
INRC
45
INLC
44
INRB
43
INLB
42
INRA
41
INLA
40
BPNF
39
BPOUT
38
C
37
B
36
A
35
SCK
34
SI
33
STEPC
49 ALCC
100k
OUTL 32
10
50 ALCR
150k
OUTR 31
10
51 RECL
4.7
VCC 30 CAP 29
0.1
VCC
52 RECR
4.7
53 VFC1
0.1
FILTER 28
220
54 GND 55 VFC2
0.047
BASS5 27 BASS4 26
3.3k
68k
56 MIC
10
57 DPLL1
10
BH3874AKS2 (SQFPT64)
0.22
0.22
BASS3 25
0.1 22k
BASS2 24
0.1 15k
58 DPLL2
DPL
10
BASS1 23 HPFR3 22 HPFR2 21 HPFR1 20
0.068 47k
59 DPLR1
10
15k 47k 0.068 0.068
60 DPLR2
10
61 PS1
0.047
62 PS2
4700p 0.22
HPFL3 19 HPFL2 18 HPFL1 17
F1R1 F1R2 F2R1 F2R2 F3R1 F3R2 F4R1 F4R2 F2L1 F2L2 F3L1 F3L2 F4L1 F4L2 F5R F5L
0.068
15k 47k 0.068 0.068 47k
63 F1L1
0.22
64 F1L2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0.0022 0.0022 0.22 0.22 0.1 0.1 0.1 0.1 0.022 0.022 0.022 0.022 0.01 0.01 0.01 0.01
Fig.4
BH3874AKS2
Audio ICs
!Operation notes (1) About operation voltage supply range Within operation voltage supply range, basic circuit function operation is guaranteed within operation ambient temp. But please confirm set up constant and element, voltage set up and temp set up on use. (2) About operation temp range. If it within recommended operation voltage range, circuit function operation is guaranteed within operation temp. It corralled to conditions of power dissipation to temp. Please watch out except condition stipulated by electrical characteristics within the range. It cannot guarantee standard value of electrical characteristics. But it retains original function. (3) About Application circuit Example of application circuit drawing is convinced as recommendable. But please confirm characteristic including above mentioned noticed. At use with modification of external constant, please decide with enough margin considering distribution, ETC of this IC, external parts including quiescence characteristics and excessive characteristics. Please note that we have not yet confirmed any concerned patent rights completely. (4) About 2-wire serial control High-frequency digital signal is inputted into the SCK terminal and SI terminal. So wire and print patterns suitably to prevent interference to analog signal system line (especially to input line). (5) About ground line Please connect IC's ground to the ground of a set with one point. When the IC has common impedance to the ground line, pop noise may occur in function switching. (6) About Schmidt circuit This IC has the Schmidt circuit as preventive measures against logic signal input into the DATA (34pin) and CLK (35pin) terminals. Therefore, this IC is not affected so much by noise to a logic signal line. (7) About power on/off At on of power supply or off of power supply pop noise occurs. Therefore, please supply mute. (8) Setting of spectrum analyzer minimum light level Output offset voltage may shift due to the surrounding conditions (temperature, stresses, etc.). Therefore when setting the spectrum analyzer minimum light level, leave a margin (more than 30% to spectrum analyzer output offset voltage VOS).
!Electrical characteristic curves
+15 +10 +5 +0 -5 Gain +200 +175 +150 +125 +100 +75 +50 +25 +0 -25 -50 -75 -100 -125 -150 -175 -200 100k +25 +20 +15 +10 Gain +200 +175 +150 +125 +100 +75 +50 +25 +0 -25 -50 -75 -100 -125 -150 -175 -200 100k
+24 +22 +20 +18 +16 +14 +12 +10 +8 +6 +4 +2 +0 -2 -4 10
PHASE (deg)
GAIN (dB)
GAIN (dB)
-10 -15 -20 -25 -30 -35 -40 -45 10 100 1k 10k Phase
+0 -5 -10 -15 -20 -25 10 100 1k 10k phase
BASS (dB)
+5
PHASE (deg)
100
1k
10k
100k
FREQUENCY : f (Hz)
Note : This graph is shown at the input common-mode. Gain at the input inverting-mode is 6dB.
FREQUENCY : f (Hz)
FREQUENCY : f (Hz)
Fig.5 Vocal fade characteristics
Fig.6 Surround characteristics
Fig.7 Graphic equalizer characteristics
BH3874AKS2
Audio ICs
+34 +32 +30 +28 +26 +24 +22 +20 +18 +16 +14 +12 +10 +8 +6 +4 10
5 5 Vout 2 1 0.5 0.2 0.1 0.05 THD 0.02 0.01 0.005 0.002 10m 100m 1 0.001
18dB 15dB 12dB 9dB 6dB 3dB
2 1 500m
GAIN (dB)
200m 100m 50m 20m 10m 5m 2m
100
1k
10k
100k
1m 1m
FREQUENCY : f (Hz)
INPUT-OUTPUT DISTORATION CHARACTERISTICS : (Vrms)
Fig.8 Biamp characteristics (Input common-mode)
Fig.9 Input-output distortion characteristics
!External dimensions (Units : mm)
14.00.3 12.00.2
48 33 32 49
14.00.3 12.00.2
64 1 16
17
1.40.1 0.10.1
0.1250.1 0.15
0.65
0.30.1
SQFP-T64
0.5
TOTAL HARMONIC DISTORTION : THD (%)
OUTPUT (Vrms)
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0

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