MAX9851ETM+ Maxim Integrated Products, MAX9851ETM+ Datasheet - Page 53

• Manufacturer Part Number: MAX9851ETM+
• Description: IC CODEC AUDIO STEREO 48TQFN-EP
• Manufacturer: Maxim Integrated Products
• Type: Stereo Audior

Specifications of MAX9851ETM+

• Data Interface: Serial
• Resolution (bits): 18 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 81.5 / 88
• Dynamic Range, Adcs / Dacs (db) Typ: 82 / 87.5
• Voltage - Supply, Analog: 2.6 V ~ 3.3 V
• Voltage - Supply, Digital: 1.7 V ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Number Of Adc Inputs: 3
• Number Of Dac Outputs: 3
• Conversion Rate: 48 KSPS
• Interface Type: Serial (2-Wire, 3-Wire, I2C)
• Resolution: 18 bit
• Operating Supply Voltage: 1.7 V to 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Channels: 2 ADC/2 DAC
• Supply Current: 6.2 mA
• Thd Plus Noise: - 84 .5 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PGAML/PGAMR configures the programmable-gain
adjustment setting for the microphone left/microphone
right input. Code 0x00 is maximum gain while 0x1F is
maximum attenuation. Table 27 lists the gain setting for
each code.
1 = Mute all microphone inputs.
0 = Mute disabled.
1 = External microphone inputs.
0 = Internal microphone inputs.
Table 27. Microphone Input Gain Control Settings
Table 28. Microphone Control Bit Settings
Stereo Audio CODECs with Microphone, DirectDrive
REG
0x12
Programmable-Gain Adjustment for Microphone
Headphones, Speaker Amplifiers, or Line Outputs
PGAML/PGAMR
0x0A
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
B7
______________________________________________________________________________________
External Microphone Mode (MEXT)
0
Sources (PGAML/PGAMR)
Microphone Mute (MMIC)
B6
0
SETTING (dB)
+20
+19
+18
+17
+16
+15
+14
+13
+12
+11
+10
B5
0
B4
0
1 = Additional +20dB of gain applied to microphone
inputs by the preamplifier
0 = 0dB of gain applied by the microphone preamplifier
Preamplifier gain adds to the gain set by PGAML/
PGAMR. See the Microphone Amplifiers section.
1 = Internal bias resistors for EXTMICBIASL and
EXTMICBIASR connected.
0 = Internal bias resistors disconnected.
1 = 470Ω.
0 = 2.2kΩ.
Select 2.2kΩ when using electret or amplified micro-
phones. Select 470Ω when using an external RC filter
near the headset jack.
Microphone Bias Output Impedance Select (RBIAS)
Microphone Preamplifier Enable (PALEN/PAREN)
PGAML/PGAMR
0x14–0x1F
MMIC
Microphone Control Register (0x12)
B3
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
MEXT
B2
Resistor Bias Enable (RBEN)
RBEN
SETTING (dB)
B1
+9
+8
+7
+6
+5
+4
+3
+2
+1
+0
RBIAS
B0
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