MAX9729ETI+ Maxim Integrated Products, MAX9729ETI+ Datasheet - Page 23

• Manufacturer Part Number: MAX9729ETI+
• Description: IC AMP AUDIO .052W STER 28TQFN
• Manufacturer: Maxim Integrated Products
• Series: DirectDrive™r
• Type: Class ABr

Specifications of MAX9729ETI+

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 52mW x 2 @ 32 Ohm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Features: Bass Boost, Depop, I²C, Input Multiplexer, Short-Circuit and Thermal Protection, Shutdown, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Product: General Purpose Audio Amplifiers
• Output Power: 49 mW
• Thd Plus Noise: 0.04 %
• Supply Current: 5.5 mA
• Maximum Power Dissipation: 2286 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 16 Ohms
• Minimum Operating Temperature: - 40 C
• Amplifier Class: AB
• No. Of Channels: 2
• Supply Voltage Range: 1.8V To 3.6V
• Load Impedance: 32ohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: TQFN
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 11. BassMax Pole and Zero
Examples for a Gain Boost of 8.8dB
(R1 = 47kΩ, R2 = 22kΩ)
capacitor as close to V
and all traces that carry switching transients away from
SGND and the audio signal path. Route digital signal
traces away from the audio signal path. Make traces
perpendicular to each other when routing digital sig-
nals over or under audio signals.
The thin QFN package features an exposed paddle
that improves thermal efficiency. Ensure that the
exposed paddle is electrically isolated from PGND,
SGND, and V
SV
exposed paddle cannot be left unconnected.
SS
C6 (nF)
when the board layout dictates that the
100
82
68
56
47
22
10
Stereo Headphone Amplifier with BassMax,
DD
. Connect the exposed paddle to
______________________________________________________________________________________
f
POLE
DD
174
384
38
47
56
68
81
as possible. Route PGND
(Hz)
Volume Control, and Input Mux
f
ZERO
1060
106
130
156
190
230
490
(Hz)
Figure 9. BassMax Gain Profile Example
-10
10
-2
-4
-6
-8
8
6
4
2
0
1
WITHOUT
BassMax
BassMax
WITH
GAIN PROFILE WITH AND
10
WITHOUT BassMax
FREQUENCY (Hz)
100
f
POLE
MAX9729
CMD REGISTER
CODE = 0xFF
R1 = 47kΩ
R2 = 22kΩ
C3 = 0.1μF
f
ZERO
1k
10k
23