Datasheet Sound Processor with Built-in 2-band Equalizer BD37521FS General Description Key Specifications BD37521FS is a sound processor with built-in 2-band equalizer for car audio. Other features are stereo 4ch input selector, input-gain control, main volume, loudness, and a 4ch fader volume. It is equipped with an “Advanced switch circuit”, which is an original ROHM technology that reduces various switching noise (ex. No-signal, low frequency such as 20Hz & large signal inputs). Also, this “Advanced switch” makes control of microcomputer easier and can be used for designing high quality car audio system. Power Supply Voltage Range: Circuit Current (No Signal): Total Harmonic Distortion: Maximum Input Voltage: Cross-talk Between Selectors: Volume Control Range: Output Noise Voltage: Residual Output Noise Voltage: Operating Temperature Range: Package 7.0V to 9.5V 38mA(Typ) 0.001%(Typ) 2.3Vrms (Typ) -100dB (Typ) +15dB to -79dB 3.8µVrms(Typ) 1.8µVrms (Typ) -40°C to +85°C W(Typ) x D(Typ) x H(Max) Features Reduced switching noise of input gain control, mute, main volume, fader volume, bass, treble, and loudness by using advanced switch circuit. Built-in 1 differential input selector and 3 single-ended input selectors Built-in ground isolation amplifier inputs which is ideal for external stereo input. Built-in input gain controller which reduces switching noise for volume of a portable audio input. Lesser number of external components due to built-in 2-band equalizer filter. This makes it possible to control the Gv of 2-band equalizer and Gv of loudness by I2C BUS. A gain adjustment quantity of ±20dB with a 1 dB step gain adjustment is possible for the bass and treble. Energy-saving design resulting in low current consumption is achieved by utilizing the BiCMOS process. It has the advantage in quality over scaling down the power heat control of the internal regulators. Input pins and output pins are organized and separately laid out to keep the signal flow in one direction that consequently simplify pattern layout of the set board and decrease the board dimensions. It is possible to be controlled by a 3.3V / 5V I2C BUS . ○Product structure：Silicon monolithic integrated circuit www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 SSOP-A24 10.00mm x 7.80mm x 2.10mm Applications It is best suited for car audio applications. It is also suitable for other audio equipment such as mini-component, micro-component, television, etc. ○This product has no designed protection against radioactive rays 1/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Typical Application Circuit BD37521FS Pin Configuration TOP VIEW FIL 1 24 GND A1 2 23 SDA A2 3 22 SCL B1 4 21 VCC B2 5 20 OUTF1 C1 6 19 OUTF2 C2 7 18 OUTR1 DP1 8 17 OUTR2 9 16 N.C DP2 10 15 MUTE LDA1 11 14 LDA2 LDB1 12 13 LDB2 DN www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Pin Descriptions 1 Pin Name FIL 2 3 Pin No. Description Pin No. Pin Name LDB2 Loudness setting terminal of 2ch Description VCC/2 terminal 13 A1 A input terminal of 1ch 14 LDA2 Loudness setting terminal of 2ch A2 A input terminal of 2ch 15 MUTE External compulsory mute terminal 4 B1 B input terminal of 1ch 16 N.C. 5 B2 B input terminal of 2ch 17 OUTR2 Rear output terminal of 2ch 6 C1 C input terminal of 1ch 18 OUTR1 Rear output terminal of 1ch 7 C2 C input terminal of 2ch 19 OUTF2 Front output terminal of 2ch 8 DP1 D positive input terminal of 1ch 20 OUTF1 Front output terminal of 1ch 9 DN D negative input terminal 21 VCC Power supply terminal 10 DP2 D positive input terminal of 2ch 22 SCL I2C Communication clock terminal 11 LDA1 Loudness setting terminal of 1ch 23 SDA I2C Communication data terminal 12 LDB1 Loudness setting terminal of 1ch 24 GND GND terminal No Connection Block Diagram 22 21 20 19 18 Fader ★ 23 Fader ★ 24 17 16 15 14 13 11 12 VCC GND I2C BUS LOGIC Fader ★ Fader ★ ■ Fader Gain:0dB～-79ｄB/1dB step Gain: 0dB to -79dB/1dB step ★ no pop noise ■ Loudness 20dB～0ｄB/1ｄB 20dB to 0dB/1dBstep step ★ no pop noise ■ 2 Band EQ (Tone control ) Gain：+20dB～-20dB/1dB Gain: +20dB to -20dB/1dB ★ no pop noise ・Bass：f0=100Hz ★ Loudness ・Treble：f0=10kHz ■ Volume Gain:+15dB to -79dB/1dB Gain:+15dB～-79dB/1dB stepstep ★ no pop noise ■ Input Gain ★ 2 Band EQ (Tone control ) Gain: +20dB to 0dB/1dB Gain:+20dB～0dB/1dB step step ★ no pop noise ★ Volume/Mute ★ Input Gain Input selector (3 single - end and 1 stereo ISO) GND ISO amp VCC/ 2 1 100k 2 100k 3 www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 100k 4 100k 5 100k 6 3/27 250k 100k 7 GND ISO amp 8 250k 9 250k 10 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Absolute Maximum Ratings (Ta=25°C) Parameter Symbol Rating Unit Power Supply Voltage VCC 10.0 V Input Voltage VIN VCC+0.3 to GND-0.3 V Power Dissipation Pd 1 (Note 1) W Tstg -55 to +150 °C Storage Temperature (Note1) When mounted on standard board (70 x 70 x 1.6(mm3)), derate by 8mW/°C for Ta above 25°C. Thermal resistance θja = 125(°C/W) Material : A FR4 grass epoxy board(3% or less of copper foil area) Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings Recommended Operating Conditions Parameter Rating Symbol Min Typ Max Unit Power Supply Voltage VCC 7.0 － 9.5 V Temperature Topr -40 － +85 °C Electrical Characteristics BLOCK (Unless otherwise noted, Ta=25°C, VCC=8.5V, f=1kHz, VIN =1Vrms, Rg=600Ω, RL=10kΩ, A input, Input gain 0dB, Mute off, Volume 0dB, Tone control 0dB, Loudness 0dB, Fader 0dB) Limit Parameter Symbol Unit Conditions Min Typ Max IQ － 38 48 mA No signal Voltage Gain GV -1.5 0 +1.5 dB GV=20log(VOUT/VIN) Channel Balance CB -1.5 0 +1.5 dB THD+N － 0.001 0.05 % Output Noise Voltage* VNO － 3.8 15 μVrms Residual Output Noise Voltage* VNOR － 1.8 10 μVrms Cross-talk Between Channels* CTC － -100 -90 dB RR － -70 -40 dB CB = GV1-GV2 VOUT=1Vrms BW=400Hz to 30KHz Rg = 0Ω BW = IHF-A Fader = -∞dB Rg = 0Ω BW = IHF-A Rg = 0Ω CTC=20log(VOUT/VIN) BW = IHF-A f=1KHz VRR=100mVrms RR=20log(VCC IN/VOUT) Current Upon No Signal GENERAL Total Harmonic Distortion INPUT SELECTOR Ripple Rejection Input Impedance(A, B, C) RIN_S 70 100 130 kΩ Input Impedance (D) RIN_D 175 250 325 kΩ Maximum Input Voltage VIM 2.1 2.3 － Vrms Cross-talk Between Selectors* CTS － -100 -90 dB CMRR 50 65 － dB Common Mode Rejection Ratio * www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/27 VIM at THD+N(VOUT)=1% BW=400Hz to 30KHz Rg = 0Ω CTS=20log(VOUT/VIN) BW = IHF-A DP1 and DN input DP2 and DN input CMRR=20log(VIN/VOUT) BW = IHF-A TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS LOUDNESS FADER TREBLE BASS VOLUME MUTE INPUT GAIN BLOCK Electrical Characteristics – continued Limit Parameter Symbol Unit Min Typ Max Conditions Input gain 0dB VIN=100mVrms GIN=20log(VOUT/VIN) Input gain 20dB VIN=100mVrms GIN=20log(VOUT/VIN) Minimum Input Gain GIN_MIN -2 0 +2 dB Maximum Input Gain GIN_MAX 18 20 22 dB Gain Set Error GIN_ERR -2 0 +2 dB Mute Attenuation＊ GMUTE － -105 -85 dB Maximum Gain GV MAX 13 15 17 dB Maximum Attenuation＊ GV MIN － -100 -85 dB Attenuation Set Error 1 GV_ERR1 -2 0 +2 dB GAIN & ATT=+15dB to -15dB Attenuation Set Error 2 GV_ERR2 -3 0 +3 dB ATT=-16dB to -47dB Attenuation Set Error 3 GV_ERR3 -4 0 +4 dB ATT=-48dB to -79dB Maximum Boost Gain GB_BST 18 20 22 dB Maximum Cut Gain GB_CUT -22 -20 -18 dB Gain Set Error GB_ERR -2 0 +2 dB Maximum Boost Gain GT_BST 17 20 23 dB Maximum Cut Gain GT_CUT -23 -20 -17 dB Gain Set Error GT_ERR -2 0 +2 dB Maximum Attenuation＊ GF_MIN － -100 -90 dB Attenuation Set Error 1 GF_ERR1 -2 0 +2 dB ATT=-1dB to -15dB Attenuation Set Error 2 GF_ERR2 -3 0 +3 dB ATT=-16dB to -47dB Attenuation Set Error 3 GF_ERR3 -4 0 +4 dB ATT=-48dB to -79dB Output Impedance ROUT - － 50 Ω VIN=100mVrms Maximum Output Voltage VOM 2 2.2 － Vrms Maximum Gain GL_MAX 17 20 23 dB Gain Set Error GL_ERR -2 0 +2 dB GAIN=+20dB to +1dB Mute ON GMUTE=20log(VOUT/VIN) BW = IHF-A Volume = 15dB VIN=100mVrms GV=20log(VOUT/VIN) Volume = -∞dB GV=20log(VOUT/VIN) BW = IHF-A Gain=+20dB fo=100Hz VIN=100mVrms GB=20log (VOUT/VIN) Gain=-20dB fo=100Hz VIN=2Vrms GB=20log (VOUT/VIN) Gain=+20dB to -20dB fo=100Hz Gain=+20dB fo=10kHz VIN=100mVrms GT=20log (VOUT/VIN) Gain=-20dB fo=10kHz VIN=2Vrms GT=20log (VOUT/VIN) Gain=+20dB to -20dB fo=10kHz Fader = -∞dB GF=20log(VOUT/VIN) BW = IHF-A THD+N=1% BW=400Hz to 30KHz Gain 20dB VIN=100mVrms GL=20log(VOUT/VIN) Gain=+20dB to +1dB VP-9690A (Average value detection, effective value display) filter by Matsushita Communication is used for * measurement. Phase between input / output is same. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Typical Performance Curves 10 1 THD+N (%) 30 20 0 2 4 6 8 100Hz 0.1 0.1 0.01 0.01 0.001 0.001 10 0.1 1 10 Figure 2. THD+N vs Output Voltage 4 20 3 15 BASS GAIN : -20dB to +20dB /1dB step fo : 100Hz 10 Gain=0dB Gain [dB] Gain[dB] Gain (dB) vs Power Supply 25 1 0 -1 -2 5 0 -5 -10 -3 -15 -4 -20 -5 0.01 Vout (V) 5 2 0.001 Vout [Vrms] Output Voltage: VOUT [Vrms] Power Supply Voltage: VCC [V] VCC[V] Figure 1. Current Signal (No Signal) Voltage 1 10kHz 1kHz 10 0 10 Vin[Vrms] VIN [Vrms] Vout 40 THD+N [%] THD+N[%] Current Upon No Signal: IQ [mA] Iq[mA] 50 -25 10 100 1k 10k 100k 10 Frequency (Hz) Figure 3. Gain vs Frequency www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 100 1k 10k Frequency [Hz] 100k Figure 4. Bass Gain vs Frequency 6/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Typical Performance Curves – continued 0 25 TREBLE GAIN:-20dB to +20dB /1dB step fo : 10kHz 20 15 -10 Gain[dB] (dB) Gain Gain [dB] 10 5 0 -5 -20 -30 -40 -50 -10 -15 -60 -20 -70 -25 10 100 1k 10k Frequency [Hz] 10 100k 100 1k 10k 100k Frequency [Hz] Frequency (Hz) Figure 6. CMRR vs Frequency Figure 5. Treble Gain vs Frequency 1000 Din-Audio 出力雑音電圧 [uVrms] Output Noise [µVrms] Output Noise [µVrms] 出力雑音電圧[uVrms] 1000 IHF-A 100 10 1 DIN-Audio IHF-A 100 10 1 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 -20 -15 -10 -5 Volume Volume Gain[dB] Gain [dB] 5 10 15 20 Figure 8. Output Noise vs Bass Gain Figure 7. Output Noise vs Volume Gain www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 0 Bass Gain Bass Gain[dB] [dB] 7/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Typical Performance Curves – continued 2.5 IHF-A 最大出力[Vrms] DIN-Audio Output Voltage : VOUT [Vrms] 出力雑音電圧 [uVrms] Output Noise [µVrms] 1000 100 10 2.0 1.5 1.0 0.5 0.0 1 -20 -15 -10 -5 0 5 10 15 20 Treble Gain Treble Gain [dB] [dB] 100 100000 Figure 10. Output Voltage vs RLOAD Figure 9. Output Noise vs Treble Gain Figure 11. Advanced Switch 1 www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 1000 10000 RLOAD [Ω] 出力負荷[ohm] Figure 12. Advanced Switch 2 8/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Timing Chart Control Signal Specification (1) Electrical Specifications and Timing for Bus Lines and I/O Stages SDA tBUF tLOW tHD;STAT tF tR tSP SCL tHD;DAT tHD;STA tHIGH tSU;DAT tSU;STAT tSU;STOT Sr S P P Figure 13. Definition of Timing on the I2C-bus Table 1 Characteristics of the SDA and SCL bus lines for I2C-bus devices (Unless specified otherwise, Ta=25°C, VCC=8.5V) Parameter Fast-mode I2C-bus Symbol Min Max Unit 1 SCL clock frequency fSCL 0 400 kHz 2 tBUF 1.3 － μs tHD;STA 0.6 － μs 4 Bus free time between a STOP and START condition Hold time (repeated) START condition. After this period, the first clock pulse is generated LOW period of the SCL clock tLOW 1.3 － μs 5 HIGH period of the SCL clock 6 Set-up time for a repeated START condition 3 tHIGH 0.6 － μs tSU;STA 0.6 － μs tHD;DAT 0.06(Note) － μs 7 Data hold time: 8 Data set-up time tSU;DAT 120 － ns 9 Set-up time for STOP condition tSU;STO 0.6 － μs All values referred to VIH Min and VIL Max Levels (see Table 2). (Note) The device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the VIH Min of the SCL signal) in order to bridge the undefined region of the falling edge of SCL. About 7(tHD;DAT), 8(tSU;DAT), make the setup in which the margin is fully in . Table 2 Characteristics of the SDA and SCL I/O stages for I2C-bus devices Parameter Fast-mode devices Symbol Min Max +1 10 LOW level input voltage: VIL -0.3 Unit V 11 HIGH level input voltage: VIH 2.3 5 V 12 Pulse width of spikes which must be suppressed by the input filter. tSP 0 50 ns 13 LOW level output voltage: at 3mA sink current Input current each I/O pin with an input voltage between 0.4V and 4.5V. VOL1 0 0.4 V II -10 +10 μA 14 tHD;STA :2µs tHD;DAT :1µs tSU;DAT :1µs tSU;STO :2µs SCL tBUF :4µs tLOW :3µs tHIGH :1µs SDA SCL clock frequency: 250kHz (1) Figure 14. A Command Timing Example in the I2C Data Transmission www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS (2) I2C BUS FORMAT MSB S LSB MSB Slave Address 1bit A 8bit S Slave Address LSB MSB Select Address LSB A Data A P 1bit 8bit 1bit 8bit 1bit 1bit = Start condition (Recognition of start bit) = Recognition of slave address. 7 bits in upper order are voluntary. The least significant bit is “L” due to writing. = ACKNOWLEDGE bit (Recognition of acknowledgement) = Select every of volume, bass and treble. = Data on every volume and tone. = Stop condition (Recognition of stop bit) A Select Address Data P (3) I2C BUS Interface Protocol (a) Basic Form S Slave Address MSB A LSB Select Address MSB A LSB Data A MSB P LSB (b) Automatic Increment (Select Address increases (+1) according to the number of data. S Slave Address MSB A LSB Select Address MSB A LSB Data1 MSB A Data2 LSB MSB A ････ LSB DataN MSB A P LSB (Example) ①Data1 shall be set as data of address specified by Select Address. ②Data2 shall be set as data of address specified by Select Address +1. ③DataN shall be set as data of address specified by Select Address +N-1. (c) Configuration Unavailable for Transmission (In this case, only Select Address1 is set. S Slave Address MSB A LSB Select Address1 MSB A LSB Data A MSB LSB Select Address 2 MSB A Data LSB MSB A P LSB (Note) If any data is transmitted as Select Address 2 next to data, it is recognized as data, not as Select Address 2. (4) Slave Address MSB LSB A6 A5 A4 A3 A2 A1 A0 R/W 1 0 0 0 0 0 0 0 www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 10/27 80H TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS (5) Select Address & Data Select Address (hex) Items MSB Data D7 Advanced switch ON/OFF D6 0 D5 D4 Advanced switch time of Input Gain/Volume Tone/Fader/Loudness LSB D3 D2 0 0 D1 D0 Advanced switch time of Mute Initial setup 1 01 Initial setup 2 02 0 0 0 0 0 0 0 0 Initial setup 3 03 0 0 0 1 0 0 1 0 Input Selector 05 0 0 0 Input selector Input gain 06 Mute ON/OFF 0 0 Input Gain Volume gain 20 Volume Gain / Attenuation Fader 1ch Front 28 Fader Attenuation Fader 2ch Front 29 Fader Attenuation Fader 1ch Rear 2A Fader Attenuation Fader 2ch Rear 2B Fader Attenuation Test mode 1 2C 1 1 1 1 1 1 1 1 Test mode 2 41 0 0 1 0 0 0 0 1 Test mode 3 44 0 0 0 0 0 0 0 0 Test mode 4 47 0 0 0 1 0 0 0 1 Bass gain 51 Bass Boost/Cut 0 0 Test mode 5 54 1 0 0 0 0 Treble gain 57 Treble Boost/Cut 0 0 Treble Gain Loudness Gain 75 0 0 0 Loudness Gain System Reset FE 1 0 0 0 1 Bass Gain 0 0 0 0 0 0 Advanced switch Note 1. The advance switch works in the latch part while changing from one function to another. 2. Upon continuous data transfer, the Select Address rolls back to the first address on automatic increment function, as shown below. →01 → 02 → 03 → 05 → 06 → 20 → 28 → 29 → 2A → 2B → 2C → 41 → 44 → 47 → 51 → 54 → 57 →7 5 3. Advanced switch is not used for the function of input selector etc. Therefore, please turn on MUTE when changing the settings of this side of a set. 4. When using Mute function when changing input selector, please switch Mute ON/OFF for waiting advanced-mute time. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 11/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Select address 01 (hex) MSB Time D7 Advanced switch time of Mute D6 D5 D4 D3 D2 0.6msec Advanced Switch ON/OFF 1.0msec 1.4msec 0 Advanced switch time of Input gain/Volume Tone/Fader/Loudness 0 0 3.2msec D7 D6 4.7 msec Advanced Switch ON/OFF 7.1 msec 11.2 msec 0 14.4 msec D5 D4 0 0 0 1 1 0 1 1 MSB Mode D7 OFF D0 0 0 0 1 1 0 1 1 D3 D2 0 0 LSB D1 D0 Advanced switch Time of Mute Advanced switch ON/OFF D6 0 0 ON D1 Advanced switch time of Input gain/Volume/Tone/Fader/Loudness MSB Time LSB 1 D5 D4 Advanced switch time of Input gain/Volume Tone/Fader/Loudness LSB D3 D2 0 0 D1 D0 Advanced switch Time of Mute Select address 05(hex) Mode OUT F1/R1 OUT F2/R2 A A1 B B1 C C1 C2 DP1 DP2 D diff MSB D7 Input Selector D3 D2 D1 D0 A2 0 0 0 0 B2 0 0 0 1 0 0 1 0 0 1 1 0 1 0 0 1 0 D6 0 D5 0 D4 LSB 0 Input SHORT Prohibition Other setting Input SHORT : The input impedance of each input terminal is lowered from 100kΩ(TYP) to 6 kΩ(TYP). (For quick charge of coupling capacitor) : Initial condition www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 12/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Select address 06 (hex) Gain 0dB 1dB 2dB 3dB 4dB 5dB 6dB 7dB 8dB 9dB 10dB 11dB 12dB 13dB 14dB 15dB 16dB 17dB 18dB 19dB 20dB MSB D7 Mute ON/OFF Input Gain D6 0 D5 0 Prohibition Mode OFF ON MSB D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 ： 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 1 ： 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 0 ： 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 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 ： 1 1 1 1 1 Mute ON/OFF D6 D5 0 1 0 0 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 D4 LSB D7 Select address 20, 28, 29, 2A, 2B (hex) MSB Gain & ATT D7 Prohibition LSB D3 D2 D1 D0 Input Gain Vol, Fader Gain / Attenuation LSB 0 0 0 0 0 0 0 1 ： ： ： ： ： ： ： ： 0 1 1 1 0 0 0 0 15dB 0 1 1 1 0 0 0 1 14dB 0 1 1 1 0 0 1 0 13dB 0 1 1 1 0 0 1 1 ： ： ： ： ： ： ： ： ： -77dB 1 1 0 0 1 1 0 1 -78dB 1 1 0 0 1 1 1 0 -79dB 1 1 0 0 1 1 1 1 1 1 0 1 0 0 0 0 Prohibition ： ： ： ： ： ： ： ： 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 -∞dB 1 Fader can be set from 0dB to -∞. : Initial condition www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 13/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Select address 51, 57 (hex) Gain MSB D3 D2 D1 D0 0dB 0 0 0 0 0 1dB 0 0 0 0 1 2dB 0 0 0 1 0 3dB 0 0 0 1 1 4dB 0 0 1 0 0 5dB 0 0 1 0 1 6dB 0 0 1 1 0 7dB 0 0 1 1 1 8dB 0 1 0 0 0 9dB 0 1 0 0 1 10dB 0 1 0 1 0 0 1 0 1 1 0 1 1 0 0 0 1 1 0 1 14dB 0 1 1 1 0 15dB 0 1 1 1 1 16dB 1 0 0 0 0 17dB 1 0 0 0 1 18dB 1 0 0 1 0 19dB 1 0 0 1 1 20dB 1 0 1 0 0 12dB 13dB Bass/ Treble Boost /Cut D6 0 D5 LSB D4 11dB D7 Bass/ Treble Gain 0 Prohibition Mode MSB D7 Boost 0 Cut 1 1 0 1 0 1 ： ： ： ： ： 1 1 1 1 0 1 1 1 1 1 Bass/ Treble Boost/Cut D6 D5 0 0 D4 D3 LSB D2 D1 D0 Bass/Treble Gain : Initial condition www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Select address 75 (hex) MSB Gain D7 Loudness Gain D4 D3 D2 D1 D0 0dB 0 0 0 0 0 1dB 0 0 0 0 1 2dB 0 0 0 1 0 3dB 0 0 0 1 1 4dB 0 0 1 0 0 5dB 0 0 1 0 1 6dB 0 0 1 1 0 7dB 0 0 1 1 1 8dB 0 1 0 0 0 9dB 0 1 0 0 1 10dB 0 1 0 1 0 0 1 0 1 1 11dB D6 0 12dB D5 LSB 0 0 0 1 1 0 0 13dB 0 1 1 0 1 14dB 0 1 1 1 0 15dB 0 1 1 1 1 16dB 1 0 0 0 0 17dB 1 0 0 0 1 18dB 1 0 0 1 0 19dB 1 0 0 1 1 20dB 1 0 1 0 0 1 0 1 0 1 Prohibition ： ： ： ： ： 1 1 1 1 1 : Initial condition (6) About Power ON Reset The IC has a built-in initialization circuit that triggers at power ON of supply voltage. Please send initial data to all addresses at supply voltage ON. Also, please turn ON MUTE at the set side until this initial data is sent. Limit Parameter Symbol Unit Conditions Min Typ Max Rise Time of VCC tRISE 33 － － µsec VCC Voltage of Release Power ON Reset VPOR － 4.1 － V VCC rise time from 0V to 5V (7) About External Compulsory Mute Terminal It is possible to forcibly set MUTE externally by setting the input voltage at the MUTE terminal. Mute Voltage Condition Mode GND to 1.0V MUTE ON 2.3V to VCC MUTE OFF Establish the voltage of MUTE in the condition to be defined. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 15/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Application Information 1. Function and Specifications Function Input selector Input gain Mute Volume Bass Treble Fader Loudness www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Specifications ・Stereo 3 input ・Differential 1 input ・+20dB to 0dB(1dB step) ・Possible to use “Advanced switch” for prevention of switching noise. ・Possible to use “Advanced switch” for prevention of switching noise. ・+15dB to -79dB(1dB step), -∞dB ・Possible to use “Advanced switch” for prevention of switching noise. ・+20dB to -20dB(1dB step) ・Q=1 ・fo=100Hz ・Possible to use “Advanced switch” at changing gain ・+20dB to -20dB(1dB step) ・Q=1.25 ・fo=10kHz ・Possible to use “Advanced switch” at changing gain ・0dB to -79dB(1dB step), -∞dB ・Possible to use “Advanced switch” for prevention of switching noise. ・20dB to 0dB(1dB step) ・Possible to use “Advanced switch” for prevention of switching noise. 16/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS 2. Volume / Fader volume attenuation of the details (dB) D7 D6 D5 D4 D3 D2 D1 D0 (dB) D7 D6 D5 D4 D3 D2 D1 D0 +15 +14 +13 +12 +11 +10 +9 +8 +7 +6 +5 +4 +3 +2 +1 0 -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 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 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 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 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 0 0 0 0 0 0 0 0 1 1 1 1 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 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 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 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 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 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 -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 -65 -66 -67 -68 -69 -70 -71 -72 -73 -74 -75 -76 -77 -78 -79 -∞ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 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 0 0 0 0 0 0 0 0 0 0 0 0 0 1 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 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 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 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 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 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 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 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 Fader can be set from 0dB to -∞. : Initial condition www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 17/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS 3. Application Circuit GND SDA SCL VCC 10µ OUTF1 OUTF2 OUTR1 OUTR2 10µ 22 21 20 10µ 19 18 Fader ★ 23 10µ Fader ★ 24 MUTE 0.1µ 10µ 17 2.2K 16 15 14 13 11 12 VCC GND I2C BUS LOGIC ・Treble：f0=10kHz Fader ★ Fader ★ ■ Fader Gain:0dB～-79ｄB/1dB Gain: 0dB to -79dB/1dBstep step ★ no pop noise ■ Loudness 20dB to 0dB/1dB step 20dB～0ｄB/1ｄB step ★ no pop noise ■ 2 Band EQ (Tone control) Gain:+20dB to -20dB/1dB Gain：+20dB～-20dB/1dB ★ no pop noise ・Bass：f0=100Hz ★Loudness ■ Volume Gain:+15dB to -79dB/1dBstep step Gain:+15dB～-79dB/1dB ★ no pop noise ■ Input Gain Gain:+20dB to 0dB/1dBstep step Gain:+20dB～0dB/1dB ★ no pop noise ★ 2 Band EQ (Tone control) ★Volume/ Mute ★Input Gain Input selector (3 single-end and 1 stereo ISO) GND ISO amp VCC/ 2 1 100k 2 10µ 100k 3 2.2µ Single 1 100k 4 2.2µ 100k 5 2.2µ Single 2 100k 6 2.2µ 2.2µ Single 3 250k 100k 7 8 2.2µ GND ISO amp 250k 9 2.2µ 250k 10 10µ GND Isoration 2.2µ Unit R : [Ω] C : [F] Notes on wiring ① Please connect the decoupling capacitor of the power supply in the shortest possible distance to GND. ② GND Lines should be one-point connected. ③ Wiring pattern of Digital should be away from that of analog unit and crosstalk should not be acceptable. ④ Lines of SCL and SDA of I2C BUS should not be parallel if possible. The lines should be shielded, if they are adjacent to each other. ⑤ Lines of analog input should not be parallel if possible. The lines should be shielded, if they are adjacent to each other. ⑥TEST pin (Pin 16) should be OPEN. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 18/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Power Dissipation About the thermal design of the IC Characteristics of an IC are greatly affected by the temperature at which it is used. Exceeding absolute maximum ratings may degrade and destroy the device. Careful consideration must be given to the heat of the IC from the two standpoints of immediate damage and long-term reliability of operation. Reference data SSOP-A24 Power Dissipation : Pd (W) 1.5 Measurement condition: ROHM Standard board board Size : 70 x 70 x 1.6(mm3) material : A FR4 grass epoxy board(3% or less of copper foil area) 1.0W 1.0 θja = 125°C/W 0.5 0.0 0 25 50 75 85 125 10 150 0 Ambient Temperature : Ta (°C) Figure 15. Temperature Derating Curve (Note) Values are actual measurements and are not guaranteed. Power dissipation values vary according to the board on which the IC is mounted. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 19/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS I/O Equivalent Circuits Pin No. Pin Name Pin Voltage Equivalent Circuit Pin Description VCC 2 3 4 5 6 7 A1 A2 B1 B2 C1 C2 4.25 100kΩ A terminal for signal input. The input impedance is 100kΩ (Typ). 250kΩ A terminal for signal input. The input impedance is 250kΩ (Typ). GND VCC 8 9 10 DP1 DN DP2 4.25 GND VCC 11 14 LDA1 LDA2 The loudness characteristic setting terminal. 4.25 GND VCC 12 13 LDB1 LDB2 The loudness characteristic setting terminal. 4.25 GND VCC 0.58×VCC 15 MUTE A terminal for external compulsory mute. If terminal voltage is High level, the mute is off. If the terminal voltage is Low level, the Mute is ON. 250kΩ － 1.65V GND The values in the pin explanation and input/output equivalent circuit are for reference purposes only. It is not a guaranteed value. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 20/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS I/O Equivalent Circuits – continued Pin No. Pin Name Pin Voltage Equivalent Circuit Pin Description VCC 17 18 19 20 OUTR2 OUTR1 OUTF2 OUTF1 4.25 A terminal for fader output. GND 21 VCC 8.5 Power supply terminal. VCC 22 SCL A terminal for clock input of I2C BUS communication. － 1.65V GND VCC 23 SDA A terminal for data input of I2C BUS communication. － 1.65V GND 24 GND 0 Ground terminal. VCC 1/2 VCC terminal. Voltage for reference bias of analog signal system. The simple precharge circuit and simple discharge circuit for an external capacitor are built in. 50k 1 FIL 4.25 50k GND 16 TEST - TEST terminal The values in the pin explanation and input/output equivalent circuit are for reference purposes only.. It is not a guaranteed value. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 21/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Operational Notes 1. Reverse Connection of Power Supply Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when connecting the power supply, such as mounting an external diode between the power supply and the IC’s power supply pins. 2. Power Supply Lines Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and aging on the capacitance value when using electrolytic capacitors. 3. Ground Voltage Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition. 4. Ground Wiring Pattern When using both small-signal and large-current ground traces, the two ground traces should be routed separately but connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal ground caused by large currents. Also ensure that the ground traces of external components do not cause variations on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance. 5. Thermal Consideration Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in deterioration of the properties of the chip. In case of exceeding this absolute maximum rating, increase the board size and copper area to prevent exceeding the Pd rating. 6. Recommended Operating Conditions These conditions represent a range within which the expected characteristics of the IC can be approximately obtained. The electrical characteristics are guaranteed under the conditions of each parameter. 7. Inrush Current When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may flow instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and routing of connections. 8. Operation Under Strong Electromagnetic Field Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction. 9. Testing on Application Boards When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should always be turned off completely before connecting or removing it from the test setup during the inspection process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and storage. 10. Inter-pin Short and Mounting Errors Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin. Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and unintentional solder bridge deposited in between pins during assembly to name a few. 11. Unused Input Pins Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the power supply or ground line. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 22/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Operational Notes – continued 12. Regarding the Input Pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a parasitic diode or transistor. For example (refer to figure below): When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should be avoided. Resistor Transistor (NPN) Pin A Pin B C E Pin A N P+ P N N P+ N Pin B B Parasitic Elements N P+ N P N P+ B N C E Parasitic Elements P Substrate P Substrate GND GND Parasitic Elements GND Parasitic Elements GND N Region close-by Figure 16. Example of monolithic IC structure 13. About a Signal Input Part (a) About Input Coupling Capacitor Constant Value In the input signal terminal, please decide the constant value of the input coupling capacitor C(F) that would be sufficient to form an RC characterized HPF with input impedance R IN(Ω) inside the IC. G〔dB〕 C〔F〕 0 RIN 〔Ω〕 A(f) SSH f〔Hz〕 INPUT A f 2 fCRIN 2 1 2 fCRIN 2 (b) About the Input Selector SHORT SHORT mode is the command which makes switch SSH =ON of input selector part so that the input impedance RIN of all terminals becomes small. Switch SSH is OFF when SHORT command is not selected. The constant time brought about by the small resistance inside and the capacitor outside the LSI becomes small when this command is used. The charge time of the capacitor becomes short. Since SHORT mode turns ON the switch of SSH and makes it low impedance, please use it at no signal condition. 14. About Mute Terminal(Pin 15) when power supply is OFF There should be no applied voltage across the Mute terminal (Pin 15) when power-supply is OFF. A resistor (about 2.2kΩ) should be connected in series to Mute terminal in case a voltage is supplied to Mute terminal. (Please refer Application Circuit Diagram.) www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 23/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Operational Notes – continued 15. About TEST Pin TEST Pin should be OPEN. Pin 16 of BD37521 is a TEST Pin 16. About the External Parts Setting of Loudness Circuit This IC is equipped with a Loudness circuit. The Loudness gain is fixed inside the IC but the frequency characteristic can be freely set using external filter parts . The circuit composition of the Loudness part is shown below. Incidentally, when not using the Loudness circuit, so the input of the inner amplifier is not floating, short circuit LDA1(Pin 11) to LDB1(Pin 12), and LDA2(Pin 14) to LDB2(Pin 13) respectively. Loudness LDA1 LDB1 11 LDB2 12 56k 13 14 56k R1 1000p R2 4.7k 0.047μ R1 1000p C1 4.7k LDA2 C= R3 C2 R3 C2 R2 4.7k 4.7k 0.047μ Figure 17. About the External Parts Setting of Loudness Circuit The frequency characteristic of Loudness is decided according to Figure 17. G_LOUD can be made 20dB when it has the same external parts as in Figure 17 (recommended value). G_LOUD is the amount of effect of Loudness when it is set up at 20dB Loudness Gain (Page 15). Each parameter (Gain, Frequency) of the frequency characteristics of Loudness can be changed the following approximate equation: by referring to (Note) Design the fc2 value such that it is more than one digit bigger than fc1 to get the effect on Loudness. Loudness cut-off frequency f c1 1 Hz 2πC2 R1 R3 f c2 1 Hz 2πC1R2 R3 Loudness Gain (The amount of effect of Loudness) R3 20 log R1 R3 R3 G HICUT 20 log R //R R 3 1 2 G LOUD www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 dB dB 24/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Ordering Information B D 3 7 5 Part Number 2 1 F S - Package FS: SSOP-A24 E2 Packaging and forming specification E2: Embossed tape and reel Marking Diagram SSOP-A24(TOP VIEW) Part Number Marking BD37521FS LOT Number 1PIN MARK www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 25/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Physical Dimension, Tape and Reel Information Package Name www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 SSOP-A24 26/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 BD37521FS Revision History Date Revision 16.Dec.2015 001 Changes New Release www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 27/27 TSZ02201-0C2C0E100460-1-2 16.Dec.2015 Rev.001 Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you (Note 1) , transport intend to use our Products in devices requiring extremely high reliability (such as medical equipment equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific Applications. (Note1) Medical Equipment Classification of the Specific Applications JAPAN USA EU CHINA CLASSⅢ CLASSⅡb CLASSⅢ CLASSⅢ CLASSⅣ CLASSⅢ 2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our Products may cause. The following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. Our Products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any special or extraordinary environments or conditions. If you intend to use our Products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust [c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves [e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items [f] Sealing or coating our Products with resin or other coating materials [g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the Products in places subject to dew condensation 4. The Products are not subject to radiation-proof design. 5. Please verify and confirm characteristics of the final or mounted products in using the Products. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in the range that does not exceed the maximum junction temperature. 8. Confirm that operation temperature is within the specified range described in the product specification. 9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Precaution for Mounting / Circuit board design 1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice-PGA-E © 2015 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. Therefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. Precaution for Electrostatic This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). Precaution for Storage / Transportation 1. Product performance and soldered connections may deteriorate if the Products are stored in the places where: [a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] the temperature or humidity exceeds those recommended by ROHM [c] the Products are exposed to direct sunshine or condensation [d] the Products are exposed to high Electrostatic 2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is exceeding the recommended storage time period. 3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of which storage time is exceeding the recommended storage time period. Precaution for Product Label QR code printed on ROHM Products label is for ROHM’s internal use only. Precaution for Disposition When disposing Products please dispose them properly using an authorized industry waste company. Precaution for Foreign Exchange and Foreign Trade act Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign trade act, please consult with ROHM in case of export. Precaution Regarding Intellectual Property Rights 1. All information and data including but not limited to application example contained in this document is for reference only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. 2. ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the Products with other articles such as components, circuits, systems or external equipment (including software). 3. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to manufacture or sell products containing the Products, subject to the terms and conditions herein. Other Precaution 1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM. 2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of ROHM. 3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the Products or this document for any military purposes, including but not limited to, the development of mass-destruction weapons. 4. The proper names of companies or products described in this document are trademarks or registered trademarks of ROHM, its affiliated companies or third parties. Notice-PGA-E © 2015 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s representative. 3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice – WE © 2015 ROHM Co., Ltd. All rights reserved. Rev.001 Datasheet BD37521FS - Web Page Buy Distribution Inventory Part Number Package Unit Quantity Minimum Package Quantity Packing Type Constitution Materials List RoHS BD37521FS SSOP-A24 2000 2000 Taping inquiry Yes