NS4890C

深圳市纳芯威科技有限公司 NS4890C Jun.2022V1.0 SHENZHENNSIWAYTECHNOLOGY CO.,LTD NS4890C 2.4W Mono Class AB audio amplifier 1 Features 3 Description NS4890C is a class AB bridge output audio  Voltage range:3.0V-5.0V  Output power: 1.56W@RL=8Ω/THD+N=10%  Leakage current in shutdown mode:1uA(typical)  The SD pin is used for low level control to enter capacitors and buffering networks,it is more suitable shutdown mode. for portable systems.  Stable unity gain.  External feedback resistor and input resistor,  amplifier. Its application circuit is simple and only a few peripheral devices are needed.The output does not require external coupling capacitors or lifting NS4890C can reduce power consumption by controlling the SD pin to enter low power shutdown mode. The voltage gain of the amplifier can be adjustable gain. adjusted by configuring the peripheral resistor for MSOP8 package. easy application. NS4890C is available in MSOP8 package and is 2 Application  Smart wear  Automobile data recorder rated for operating temperatures ranging from -40℃ to 85℃. 4 Typical application circuit 1 2022Copyright © Nsiway Technology 深圳市纳芯威科技有限公司 NS4890C Jul.2022V1.0 SHENZHENNSIWAYTECHNOLOGY CO.,LTD 5 Pin configuration The pin diagram of MSOP8 is shown below. SD 1 Bypass 2 NC 3 INN 4 NSIWAY NS4890C 8 VO2 7 GND 6 VDD 5 VO1 No. pin name description 1 SD The device enters in shutdown mode when a low level is applied on this pin 2 Bypass 3 NC - 4 INN Negative input of the first amplifier, receives the audio input signal 5 VO1 Negative output 6 VDD Positive power supply pin 7 GND Power ground 8 VO2 Positive output Bypass capacitor pin which provides the common mode voltage 6 Limit operating parameters Name Parameter Input Voltage 2.8V ~ 5.5V ESD Susceptibility 2kV-HBM Storage Temperature −65°C to +150°C Operating Temperature −40°C to +85°C Junction Temperature 150°C Lead Temp(Soldering, in 10s) 260°C Thermal Resistance θJA 140°C/W θJC 35°C/W Note: Exceeding the limit operating parameters above may cause permanent damage to the chip. Prolonged exposure to any of these limiting conditions may affect the reliability and longevity of the chip. 2 2022 Copyright © Nsiway Technology 深圳市纳芯威科技有限公司 NS4890C Jul.2022V1.0 SHENZHENNSIWAYTECHNOLOGY CO.,LTD 7 Electrical characteristics Operating conditions(unless otherwise stated) : T=25℃,VDD=5V. symbol parameter VDD Supply voltage IDD Quiescent Current ISD Shutdown Current VOS Output offset voltage RO Output resistor Power testing conditions Min. standard Max. unit 5.5 V 6 10 mA 1 20 µA 5.7 50 mV 8.5 10 KΩ 3.0 Supply VIN＝0V, Io=0A 7 THD+N＝1%,f=1KHz PO THD+N Output power Total distortion+Noise RL=4Ω 1.8 RL=8Ω 1.3 W THD+N=10%,f=1KHz RL=4Ω 2. 36 RL=8Ω 1.56 W AVD=2, 20Hz≤f≤20KHz RL=8Ω,PO=0.5W % 0.15 PSRR Power supply rejection ratio 65 SNR Signal-to-noise ratio VIH SD input at high level 1.4 VDD V VIL SD input at low level 0 0.5 V Tst Start up time RL＝4Ω,Po＝1W Bypass=1uf 80 dB 78 dB 180 3 ms 2022 Copyright © Nsiway Technology 深圳市纳芯威科技有限公司 NS4890C Jul.2022V1.0 SHENZHENNSIWAYTECHNOLOGY CO.,LTD 8 Typical characteristic curves In the following characteristic curves, T=25℃(unless conditions are specified). TND+N VS. Frequency THD+N VS. Po +N VS. Po RL=8ohm RL=8ohm PO=0.5W RL=4ohm RL=8ohm 4 2022 Copyright © Nsiway Technology 深圳市纳芯威科技有限公司 NS4890C Jul.2022V1.0 SHENZHENNSIWAYTECHNOLOGY CO.,LTD 9 Application specifications 9.1 Basic structure description NS4890C is a class AB audio amplifier with bridge output.Two operational amplifiers are integrated internally.The gain of the first amplifier can be set by feedback resistance,and the second amplifier is followed by voltage inverting,forming an amplifier driving circuit with gain configurable differential output.Its principle block diagram is shown below. 9.2 External resistance configuration As shown in the application drawing,the gain of the operational amplifier is determined by the external resistors RFB and RIN.The gain calculation formula is as follows: AV  2  R FB . The chip is output to the load R IN through VO1 and VO2, which the bridge connection method is used. 9.3 External capacitance configuration In fact,in many applications, the speaker cannot reproduce low frequency speech below 100Hz.The input coupling capacitance CIN ( CIN and RIN form a first-order high-pass filter) determines the low-frequency response, the calculation formula is: fc  1 2  RIN  CIN . In practice, large input capacitance can not improve the low frequency performance of the system. In addition to considering the performance of the system, the suppression performance of on-off/switching noise is affected by capacitance. If the coupling capacitance is large, the delay of the feedback network is large,resulting in pop noise.A small coupling capacitance can reduce the 5 2022 Copyright © Nsiway Technology 深圳市纳芯威科技有限公司 NS4890C Jul.2022V1.0 SHENZHENNSIWAYTECHNOLOGY CO.,LTD noise. 9.4 Power bypass In amplifier applications,power bypass design is very important,especially for noise performance and power supply voltage suppression performance.In the design,the bypass capacitor should be as close as possible to the chip and power pin.Typical capacitance is an electrolytic capacitor of 10uF with a ceramic capacitor of 0.1uF. In the NS4890C application circuit, another capacitor CBY(connected to BYP pin) is also critical, affecting PSRR and on-off/switching noise performance.Generally,a ceramic capacitor of 0.1uF ~ 1uF is selected. 9.5 Shutdown mode NS4890C is provided with SD control pin, through which the customer can control whether the amplifier is working.When the SD pin is high,the audio amplifier is in operation mode. When the SD pin is low,the chip enters the shut down mode.At this time,the chip shuts off the current of 1uA, to achieve the purpose of power saving. 10 Package information MSOP8 package 11 Revision history Statement:Nsiway company has the right to modify the product information and specifications at any time without notice.Nsiway company reserves the right to interpret this manual and is responsible for the final interpretation. 6 2022 Copyright © Nsiway Technology