Electronic Components Datasheet Search |
|
MAX9789A Datasheet(PDF) 13 Page - Maxim Integrated Products |
|
MAX9789A Datasheet(HTML) 13 Page - Maxim Integrated Products |
13 / 26 page Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers ______________________________________________________________________________________ 13 Detailed Description The MAX9789A/MAX9790A combine a 2W BTL speaker amplifier with an 100mW DirectDrive headphone amplifi- er. These devices feature comprehensive click-and-pop suppression and programmable four-level speaker ampli- fier gain control. The MAX9789A/MAX9790A feature high +90dB PSRR, low 0.002% THD+N, industry-leading click- and-pop performance, low-power shutdown mode, and excellent RF immunity. The MAX9789A incorporates an integrated LDO that serves as a clean power supply for a CODEC or other circuits. The MAX9789A/MAX9790A is Microsoft Windows Vista compliant. See Table 1 for a comparison of the Microsoft Windows Vista premium mobile specifications and MAX9789A/MAX9790A specifications. The speaker amplifiers use BTL architecture, doubling the voltage drive to the speakers and eliminating the need for DC-blocking capacitors. The output consists of two sig- nals, identical in magnitude, but 180° out of phase. The headphone amplifiers use Maxim’s patented DirectDrive architecture to eliminate the bulky output DC-blocking capacitors required by traditional head- phone amplifiers. A charge pump inverts a positive supply (CPVDD) to create a negative supply (CPVSS). The headphone amplifiers operate from these bipolar supplies with their outputs biased about GND. The benefit of the GND bias is that the amplifier outputs no longer have a DC component (typically VDD / 2). This feature eliminates the large DC-blocking capacitors required with conventional headphone amplifiers to conserve board space and system cost, as well as improve low-frequency response. The MAX9789A/MAX9790A feature programmable speaker amplifier gain, allowing the speaker gain to be set by the logic voltages applied to GAIN1 and GAIN2, while the headphone amplifiers feature a fixed 3.5dB gain. Both amplifiers feature an undervoltage lockout that prevents operation from an insufficient power sup- ply and click-and-pop suppression that eliminates audible transients on startup and shutdown. The ampli- fiers include thermal overload and short-circuit protec- tion, while the headphone amplifier outputs (IEC Air Discharge) can withstand ±8kV ESD strikes. An addi- tional feature of the speaker amplifiers is that there is no phase inversion from input to output. Low-Dropout Linear Regulator (MAX9789A Only) The MAX9789A’s low-dropout (LDO) linear regulator can be used to provide a clean power supply to a CODEC or other circuitry. The LDO can be enabled independently of the audio amplifiers. Set LDO_EN = VDD to enable the LDO or set LDO_EN = GND to dis- able the LDO. The LDO is capable of providing up to 120mA continuous current and features Maxim’s Dual Mode™ feedback, easily enabling a fixed 4.75V output or a user-adjustable output. When LDO_SET is con- nected to GND, the output is internally set to 4.75V. The output voltage can be adjusted from 1.21V to 4.75V by connecting two external resistors as a voltage divider, at LDO_SET (Figure 1). Note: THD+N, DR, FREQUENCY ACCURACY, and CROSSTALK should be measured in accordance with AES-17 audio measure- ments standards. Table 1. Windows Premium Mobile Vista Specifications vs. MAX9789A/MAX9790A Specifications DEVICE TYPE REQUIREMENT WINDOWS PREMIUM MOBILE Vista SPECIFICATIONS MAX9789A/MAX9790A TYPICAL PERFORMANCE THD+N ≤ -65dB FS [20Hz, 20kHz] -94dB FS [20Hz, 20kHz] Dynamic range with signal present ≤ -80dB FS, A-weighted -97dB FS, A-weighted Analog Line Output Jack (RL = 10k Ω, FS = 0.707VRMS) Line output crosstalk ≤ -50dB [20Hz, 20kHz] -77dB [20Hz, 20kHz] THD+N ≤ -45dB FS [20Hz, 20kHz] -77dB FS [20Hz, 20kHz] Dynamic range with signal present ≤ -60dB FS, A-weighted -89dB FS, A-weighted Analog Headphone Out Jack (RL = 32 Ω, FS = 0.300VRMS) Headphone output crosstalk ≤ -50dB [20Hz, 20kHz] -74dB [20Hz, 20kHz] Dual Mode is a trademark of Maxim Integrated Products, Inc. |
Similar Part No. - MAX9789A |
|
Similar Description - MAX9789A |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |