MAX98090AETL+ Maxim Integrated, MAX98090AETL+ Datasheet - Page 83

• Manufacturer Part Number: MAX98090AETL+
• Description: Interface - CODECs 5V 130mW Stereo Headphone Amp
• Manufacturer: Maxim Integrated

Specifications of MAX98090AETL+

• Rohs: yes

MAX98090
Analog Microphone Preamplifier and PGA
The analog microphone inputs have two stages of pro-
grammable gain amplifiers, and are then routed to the
ADC mixer (record), the analog outputs (playback), or
simultaneously to both. The first, a coarse preamplifier
gain stage, includes the analog microphone enable, and
offers selectable 0dB, 20dB, or 30dB gain settings. The
Table 9. Microphone 1 Enable and Level Configuration Register
Table 10. Microphone 2 Enable and Level Configuration Register
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BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
PGAM1[4:0]
PGAM2[4:0]
PA1EN[1:0]
PA2EN[1:0]
ADDRESS: 0x10
ADDRESS: 0x11
NAME
NAME
—
—
TYPE
TYPE
R/W
R/W
R/W
R/W
—
—
POR
POR
—
—
0
0
1
0
1
0
0
0
0
1
0
1
0
0
Microphone 1 Input Amplifier Enable and Coarse Gain Setting
Microphone 1 Programmable Gain Amplifier Fine Adjust Configuration
Microphone 2 Input Amplifier Enable and Coarse Gain Setting
Microphone 2 Programmable Gain Amplifier Fine Adjust Configuration
00: Disabled 10: 20dB
01: 0dB
0x1F: 0dB
0x14: 0dB
0x13: 1dB
0x12: 2dB
0x11: 3dB
0x10: 4dB
0x0F: 5dB
00: Disabled
01: 0dB
0x1F: 0dB
0x14: 0dB
0x13: 1dB
0x12: 2dB
0x11: 3dB
0x10: 4dB
0x0F: 5dB
11: 30dB
0x0E: 6dB
0x0D: 7dB
0x0C: 8dB
0x0B: 9dB
0x0A: 10dB
0x09: 11dB
0x08: 12dB
0x07: 13dB
0x0E: 6dB
0x0D: 7dB
0x0C: 8dB
0x0B: 9dB
0x0A: 10dB
0x09: 11dB
0x08: 12dB
0x07: 13dB
second, a fine gain stage, is a programmable-gain ampli-
fier (PGA) adjustable from 0dB to 20dB in 1dB steps
(Tables 9 and 10). Together, the two stages provide up
to 50dB of signal gain for the analog microphone inputs.
To maximize the signal-to-noise ratio, use the coarse
gain settings of the first stage whenever possible. Zero-
crossing detection is included on the PGA to minimize
zipper noise while making gain changes.
Ultra-Low Power Stereo Audio Codec
0x06: 14dB
0x05: 15dB
0x04: 16dB
0x03: 17dB
0x02: 18dB
0x01: 19dB
0x00: 20dB
0x06: 14dB
0x05: 15dB
0x04: 16dB
0x03: 17dB
0x02: 18dB
0x01: 19dB
0x00: 20dB
DESCRIPTION
DESCRIPTION
—
—
10: 20dB
11: 30dB
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