MAX9789AETJ+ Maxim Integrated Products, MAX9789AETJ+ Datasheet - Page 14

• Manufacturer Part Number: MAX9789AETJ+
• Description: IC AMP AUDIO 2W STER AB 32TQFN
• Manufacturer: Maxim Integrated Products
• Series: DirectDrive™r
• Type: Class ABr

Specifications of MAX9789AETJ+

• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 2W x 2 @ 4 Ohm; 100mW x 2 @ 16 Ohm
• Voltage - Supply: 4.5 V ~ 5.5 V
• Features: Depop, Mute, Short-Circuit and Thermal Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Product: Class-AB
• Output Power: 2 W
• Thd Plus Noise: 0.004 %
• Supply Current: 0.1 mA
• Maximum Power Dissipation: 1990 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 4 Ohms
• Minimum Operating Temperature: - 40 C
• Amplifier Class: AB
• No. Of Channels: 3
• Supply Voltage Range: 4.5V To 5.5V
• Load Impedance: 4ohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: TQFN
• Rohs Compliant: Yes
• For Use With: MAX9789AEVKIT+ - EVALUATION KIT FOR MAX9789A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
The MAX9789/MAX9790 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 MAX9789/MAX9790 feature high
+90dB PSRR, low 0.002% THD+N, industry-leading click-
and-pop performance, low-power shutdown mode, and
excellent RF immunity. The MAX9789 incorporates an
integrated LDO that serves as a clean power supply for a
CODEC or other circuits.
The MAX9789/MAX9790 is Microsoft Windows Vista com-
pliant. See Table 1 for a comparison of the Microsoft
Windows Vista premium mobile specifications and
MAX9789/MAX9790 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 DirectDrive
architecture to eliminate the bulky output DC-blocking
capacitors required by traditional headphone ampli-
fiers. A charge pump inverts a positive supply (CPV
to create a negative supply (CPV
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 V
the large DC-blocking capacitors required with conven-
Table 1. Windows Premium Mobile Vista Specifications vs. MAX9789/MAX9790
Specifications
Note: THD+N, DYNAMIC RANGE, and CROSSTALK should be measured in accordance with AES-17 audio measurements standards.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
14
Analog Line Output
Jack (R
FS = 0.707V
Analog Headphone
Out Jack (R
FS = 0.300V
DEVICE TYPE
______________________________________________________________________________________
L
= 10kΩ,
L
RMS
RMS
= 32Ω,
)
)
THD+N
Dynamic range with
signal present
Line output crosstalk
THD+N
Dynamic range with
signal present
Headphone output
crosstalk
Detailed Description
DD
REQUIREMENT
/ 2). This feature eliminates
SS
). The headphone
WINDOWS PREMIUM MOBILE Vista
DD
)
SPECIFICATIONS
[20Hz, 20kHz]
[20Hz, 20kHz]
[20Hz, 20kHz]
[20Hz, 20kHz]
≤ -80dB FS,
≤ -60dB FS,
A-weighted
A-weighted
≤ -65dB FS
≤ -45dB FS
≤ -50dB
≤ -50dB
tional headphone amplifiers to conserve board space
and system cost, as well as improve low-frequency
response.
The MAX9789/MAX9790 feature programmable speak-
er 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 supply
and click-and-pop suppression that eliminates audible
transients on startup and shutdown. The amplifiers
include thermal overload and short-circuit protection.
An additional feature of the speaker amplifiers is that
there is no phase inversion from input to output.
The MAX9789’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 indepen-
dently of the audio amplifiers. Set LDO_EN = V
enable the LDO or set LDO_EN = GND to disable 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 connected
to GND, the output is internally set to 4.75V. The output
voltage can be adjusted from 1.21V to 4.75V by con-
necting two external resistors as a voltage divider, at
LDO_SET (Figure 1).
Low-Dropout Linear Regulator
TYPICAL PERFORMANCE
MAX9789/MAX9790
[20Hz, 20kHz]
[20Hz, 20kHz]
[20Hz, 20kHz]
[20Hz, 20kHz]
(MAX9789 Only)
A-weighted
A-weighted
-97dB FS,
-89dB FS,
-94dB FS
-77dB FS
-77dB
-74dB
DD
to