max9761 Maxim Integrated Products, Inc., max9761 Datasheet - Page 12

• Manufacturer Part Number: max9761
• Description: Stereo 3w Audio Power Amplifiers With Headphone Drive And Input Mux
• Manufacturer: Maxim Integrated Products, Inc.

The MAX9760–MAX9763 feature 3W BTL speaker
amplifiers, 200mW headphone amplifiers, input multi-
plexers, headphone sensing, and comprehensive click-
and-pop suppression. The MAX9760/ MAX9761 are
stereo BTL/headphone amplifiers. The MAX9762/
MAX9763 are mono BTL/stereo headphone amplifiers.
The MAX9760/MAX9762 are controlled through an I
compatible, 2-wire serial interface. The MAX9761/
MAX9763 are controlled through five logic inputs:
MUTE, SHDN, HPS_EN, GAINA/B, and IN1/2 (see
Selector Guide). The MAX9760–MAX9763 feature
exceptional PSRR (100dB at 1kHz), allowing these
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
12
QFN
19
20
21
22
24
26
28
—
—
—
—
—
—
______________________________________________________________________________________
MAX9760
TSSOP
16
17
18
19
21
23
25
—
—
—
—
—
—
QFN
Detailed Description
19
20
21
22
24
26
—
—
—
15
28
1
2
MAX9761
TSSOP
16
17
18
19
21
23
26
27
12
25
—
—
—
PIN
QFN
19
20
21
22
24
26
28
12
18
—
—
—
—
MAX9762
TSSOP
16
17
18
19
21
23
25
15
—
—
—
—
9
2
C-
QFN
19
20
21
22
24
26
12
18
15
28
—
1
2
MAX9763
devices to operate from noisy digital supplies without
the need for a linear regulator.
The speaker amplifiers use a BTL configuration. The
signal path is composed of an input amplifier and an
output amplifier. Resistor R
gain, and resistor R
The output of these two amplifiers serves as the input to
a slave amplifier configured as an inverting unity-gain
follower. This results in two outputs, identical in magni-
tude, but 180
speaker amplifiers is twice the product of the two
amplifier gains (see Gain-Setting Resistor section). A
feature of this architecture is that there is no phase
inversion from input to output.
TSSOP
16
17
18
19
21
23
15
26
27
12
25
—
9
Pin Description (continued)
°
GAINA/B
GAINRA
GAINRB
HPS_EN
OUTR+
GAINM
OUTR-
NAME
out of phase. The overall gain of the
MUTE
IN1/2
INR1
INR2
N.C.
SCL
F
sets the output amplifier’s gain.
Right-Channel Input 1
Right-Channel Input 2
Right-Channel Gain Set A
Right-Channel Gain Set B
Right-Channel Bridged Amplifier
Positive Output. OUTR+ also
serves as the right-channel
headphone amplifier output.
Right-Channel Bridged Amplifier
Negative Output
Serial Clock Line
No Connection. Not internally
connected.
Mono Gain Set
Active-High Mute Input
Headphone Enable. A logic high
enables HPS. A logic low disables
HPS and the device is always
configured as a BTL speaker amp.
Gain Select. A logic low selects
the gain set by GAIN_A. A logic
high selects the gain set by
GAIN_B.
Input Select. A logic low selects
amplifier input 1. A logic high
selects amplifier input 2.
IN
sets the input amplifier’s
FUNCTION