MAX9850ETI+ Maxim Integrated Products, MAX9850ETI+ Datasheet - Page 31

• Manufacturer Part Number: MAX9850ETI+
• Description: IC AMP AUDIO .095W STER 28TQFN
• Manufacturer: Maxim Integrated Products
• Series: DirectDrive™r
• Type: Class ABr

Specifications of MAX9850ETI+

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 95mW x 2 @ 16 Ohm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Features: DAC, Depop, Digital Inputs, I²C, I²S, Line Level Inputs & Outputs, Mute, Shutdown, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 28-WQFN Exposed Pad, 28-HWQFN
• Product: General Purpose Audio Amplifiers
• Output Power: 95 mW
• Operating Supply Voltage: 1.8 V to 3.6 V
• Supply Current: 7.6 mA
• Maximum Power Dissipation: 2857 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.8 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A write to the MAX9850 includes transmission of a
START condition, the slave address with the R/W bit set
to 0 (see Table 23), one byte of data to configure the
internal register address pointer, one or more bytes of
data, and a STOP condition. Figure 8 illustrates the
proper frame format for writing one byte of data to the
MAX9850. Figure 9 illustrates the frame format for writ-
ing n-bytes of data to the MAX9850.
The slave address with the R/W bit set to 0 indicates
that the master intends to write data to the MAX9850.
The MAX9850 acknowledges receipt of the address
byte during the master-generated 9th SCL pulse.
The second byte transmitted from the master config-
ures the MAX9850’s internal register address pointer.
The pointer tells the MAX9850 where to write the next
byte of data. An acknowledge pulse is sent by the
MAX9850 upon receipt of the address pointer data.
The third byte sent to the MAX9850 contains the data
that will be written to the chosen register. An acknowl-
edge pulse from the MAX9850 signals receipt of the
data byte. The address pointer autoincrements to the
next register address after each received data byte.
This autoincrement feature allows a master to write to
Figure 8. Writing One Byte of Data to the MAX9850
Figure 9. Writing n-Bytes of Data to the MAX9850
S
S
ACKNOWLEDGE FROM MAX9850
SLAVE ADDRESS
ACKNOWLEDGE FROM MAX9850
______________________________________________________________________________________
SLAVE ADDRESS
R/W
0
A
R/W
Stereo Audio DAC with DirectDrive
ACKNOWLEDGE FROM MAX9850
0
Write Data Format
REGISTER ADDRESS
A
ACKNOWLEDGE FROM MAX9850
REGISTER ADDRESS
A
B7 B6
ACKNOWLEDGE FROM MAX9850
sequential registers within one continuous frame.
Figure 9 illustrates how to write to multiple registers with
one frame. The master signals the end of transmission
by issuing a STOP condition.
Register addresses greater than 0xA are reserved. Do
not write to these addresses.
Send the slave address with the R/W bit set to 1 to initiate
a read operation. The MAX9850 acknowledges receipt of
its slave address by pulling SDA low during the 9th SCL
clock pulse. A START command followed by a read com-
mand resets the address pointer to register 0x0. The first
byte transmitted from the MAX9850 will be the contents of
register 0x0. Transmitted data is valid on the rising edge
of the master-generated serial clock (SCL). The address
pointer autoincrements after each read data byte. This
autoincrement feature allows all registers to be read
sequentially within one continuous frame.
A STOP condition can be issued after any number of
read data bytes. If a STOP condition is issued followed
by another read operation, the first data byte to be read
will be from register 0x0 and subsequent reads will
autoincrement the address pointer until the next STOP
condition.
B5 B4
1st DATA BYTE
Headphone Amplifier
1 BYTE
REGISTER ADDRESS POINTER
AUTOINCREMENT INTERNAL
B3 B2
A
B1 B0
B7
B6
A
ACKNOWLEDGE FROM MAX9850
B7 B6
B5
ACKNOWLEDGE FROM MAX9850
DATA BYTE
B4
1 BYTE
B5 B4
Nth DATA BYTE
B3
1 BYTE
REGISTER ADDRESS POINTER
AUTOINCREMENT INTERNAL
B3 B2
B2
REGISTER ADDRESS POINTER
AUTOINCREMENT INTERNAL
Read Data Format
B1
B1 B0
B0
A
A
P
P
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