MAX9792AEVKIT+ Maxim Integrated, MAX9792AEVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX9792AEVKIT+
• Description: Audio Amplifiers Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
• Manufacturer: Maxim Integrated

Specifications of MAX9792AEVKIT+

• Product: Class-D
• Output Power: 2 W
• Thd Plus Noise: 0.03 %
• Supply Current: 4.4 mA
• Maximum Power Dissipation: 2286 mW
• Audio Load Resistance: 4 Ohms
• Common Mode Rejection Ratio (min): 60 dB

MAX9792A Evaluation Kit
The default gain-setting resistor (R1) configures the
speaker amplifier gain to 12dB, while the default gain-
setting resistors (R3 and R4) configure the headphone
amplifier gain to 0dB. The gain can be changed by
replacing these resistors with other surface-mount 0603
resistors. Use ±1% tolerance resistors for optimum per-
formance. See Table 6 and the following equations to
select new gain-setting resistors in kilohms for the cor-
responding channel:
where A
RIN
where A
and RIN
(R3 or R4).
4
SPKR
_______________________________________________________________________________________
Speaker and Headphone Gain Setting
VSPKR
HP
VHP
is the speaker amplifier’s input resistor (R1).
is the headphone amplifier input resistors
RIN
is the desired headphone voltage gain
is the desired speaker voltage gain and
RIN
SPKR
HP
[ ]
k
[ ]
k
Ω
Ω
=
=
−
−
4
⎛
⎜
⎝
×
40 2 .
⎛
⎜
⎝
A
A
VHP
20
VSPKR
k
Ω
k
Ω
⎞
⎟
⎠
⎞
⎟
⎠
Table 6. Component Function
Headphone right
Headphone left
CHANNEL
Speaker
RIN
R1
R3
R4