MAX9729ETI+T Maxim Integrated Products, MAX9729ETI+T Datasheet - Page 16

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

Specifications of MAX9729ETI+T

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. MAX9729 Command Registers
Table 3. Shutdown Control (Register 0x00),
SHDN = V
gains for the MAX9729. Figure 8 shows the volume
control transfer function for the MAX9729.
Use bits [B7:B5] in register 0x01 to set the BEEP input
attenuation. The BEEP input attenuation is adjustable to
one of eight different values ranging from -10dB to
-56dB (see Table 6).
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
Figure 7a. Read Data Format for Reading Register 0x00 Only
X = Don’t Care.
16
Figure 7b. Read Data Format for Reading Registers 0x00 and 0x01
REGISTER
CONDITION
B7
START
0x00
0x01
0
1
______________________________________________________________________________________
S
DD
S H U TD OW N
( see Tab l e 3)
BEEP INPUT ATTENUATION (see Table 6)
FROM MASTER DEVICE
B7
SLAVE ADDRESS
CONDITION
START
S
MAX9729 disabled
MAX9729 enabled
FROM MAX9729
MUX/MIXER CONTROL
R/W
MODE
B6
FROM MASTER DEVICE
(see Table 4)
SLAVE ADDRESS
1
A
B7
FROM MAX9729
B5
COMMAND BYTE FOR REGISTER 0x00
B6
R/W
B5
FROM MAX9729
1
B4
ACK
FROM MASTER DEVICE
B4
B3
1
B7
Set B3 in register 0x01 to 1 to enable BassMax (see
Table 7). The output signal’s low-frequency response
will be boosted according to the external components
connected between OUT_ and BM_. See the BassMax
Gain-Setting Components section for details on choos-
ing the external components.
Use bits [2:0] in register 0x01 to set the maximum gain
of the MAX9729 to one of eight different values ranging
from +3.5dB to +26dB (see Table 8). The maximum
gain setting in conjunction with the volume setting
determines the overall voltage gain of the MAX9729
(see Tables 5a, 5b, 5c).
B2
B6
CONTENTS OF REGISTER 0x00
B1
( see Tab l e 7)
B5
BassM ax
E N ABLE
FROM MAX9729
B0
VOLUME CONTROL (see Table 5)
B3
B4
ACK
FROM MASTER DEVICE
B3
B7
B2
COMMAND BYTE FOR REGISTER 0x01
MAXIMUM GAIN CONTROL (see Table 8)
B6
B1
STORED AFTER ACK
B2
COMMAND BYTE IS
B5
FROM MAX9729
B0
B4
NACK
CONDITION
FROM MASTER DEVICE
B3
STOP
P
B2
B1
B1
B0
NACK
CONDITION
STOP
B0
P