 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
LM4831 数据表(PDF) 5 Page - National Semiconductor (TI) |
|
|
|
|||||||||||||||||||||||||||||
LM4831 数据表(HTML) 5 Page - National Semiconductor (TI) |
|
|
5 / 12 page  Pin Descriptions VDDA This is the analog power supply pin which powers all internal circuitry, with the exceptions of the output amplifiers and the digital logic in the Beep and Switching circuit sections. This pin should be connected to the same supply voltage as the two VDDD pins (typically 5V), but have a separate ground return path to the supply ground to minimize interaction with the high current amplifier returns and digital switching noise. In addition, this pin should be bypassed with a 0.01 µF–0.1 µF capacitor. VDDD These pins are the “digital” and high current power supply pins which power the stereo bridged output amplifier and the digital logic in the Beep and Switching circuit sections. These pins should be connected to the same supply voltage as the VDDA pin (typically 5V), but have a separate return path to the supply to avoid interferring with low level signals. In addition, this pin should be bypassed with a 0.01 µF–0.1 µF capacitor. At the power supply connection, a bulk storage capacitor of at least 10 µF will reduce the instantaneous current demanded from the power supply. GNDA, GNDD, GNDM These are the power supply ground pins. GNDA is the ground pin for the low current analog circuitry. The two GNDD pins are for the digital logic and bridged output amplifiers. GNDM is the ground for the microphone amplifier. Make sure that the high current GNDD paths are not returned through the low current GNDM or GNDA paths. These four ground pins should be star-grounded at a stable, low-impedance, noise-free system ground. BYPASS This voltage at this pin is nominally 1/2 VDDD and is created by an internal 50 k Ω resistor divider. This node should be bypassed with a capacitor value from 0.1 µF-1.0 µF. Increasing the capacitor value will increase the ramp time of the amplifiers, thereby improving turn-on pop performance. 0.1µF is typical for the bypass capacitor. In addition, a 1 M Ω resistor from the bypass pin to the positive supply is shown in Figure 3. This resistor guarantees that the LM4831 will turn-on if the device is powered up with both the PWRDWN and DS-IN pins high. If the the LM4831 will never enter that state, then the 1M Ω resistor can be removed. HP-IN This pin places the output power amplifier in “headphone” mode. If HP-IN is low, the amplifier is in bridged mode and the 2:1 mux passes the input on the EQ_IN pin. If HP-IN is high, the amplifier is in single-ended mode and the 2:1 mux passes the output of the mixing stage. Single-ended mode places the non-inverting amplifier in the output amplifiers into a high impedance state. HP-IN also has priority over the DS-IN pin, so if HP-IN and DS-IN are both high, the device is in single-ended mode and the stereo line out amplifier is in a high-impedance state. DS-IN This pin is used to put the LM4831 into “docking-station” mode and control the line out drivers and the state of the internal 2:1 analog multiplexer. If DS-IN is high, the stereo line out amplifier is on and the stereo bridged amplifier is in a high impedance state. Asserting the DS-IN pin also changes the 2:1 analog multiplexer output from the stereo signal on the L_EQIN and R_EQIN pins to the internal path from the stereo input mixer. www.national.com 5 |
|
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
