MAX98090AETL+ Maxim Integrated, MAX98090AETL+ Datasheet - Page 98

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

Specifications of MAX98090AETL+

• Rohs: yes

MAX98090
The digital biquad filter has five user-programmable
coefficients (B
coefficient is 3 bytes (24 bits) long (A
occupy 15 consecutive registers (Table 30) and each set
of three registers (per coefficient) must be programmed
consecutively for the settings to take effect. The coeffi-
cients are stored using a two’s complement format where
the first 4 bits are the integer portion and the last 20 bits
are the decimal portion (which results in an approximate
+8 to -8 range for each coefficient).
Table 30. Record Path Biquad Filter Coefficient
Table 31. Record Path Sidetone Configuration Register
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0xBB 0xBC 0xBD
0xAF
0xB2
0xB5
0xB8
BIT
ADDRESS RANGE
7
6
5
4
3
2
1
0
0xB0
0xB3
0xB6
0xB9
DSTS[1:0]
DVST[4:0]
ADDRESS: 0x1A
NAME
0
—
0xB1
0xB4
0xB7
0xBA
, B
1
, B
2
, A
RECORD BIQUAD Coefficient B0
RECORD BIQUAD Coefficient B1
RECORD BIQUAD Coefficient B2
RECORD BIQUAD Coefficient A1
RECORD BIQUAD Coefficient A2
1
TYPE
R/W
, and A
—
POR
2
—
0
0
0
0
0
0
0
), and each individual
0
NAME
is fixed at 1). They
Sidetone Enable and Digital Source Configuration
Sidetone Digital Gain Configuration
00: No sidetone selected
01: Left channel
0x00: OFF
0x01: -0.5dB
0x02: -2.5dB
0x03: -4.5dB
0x04: -6.5dB
0x05: -8.5dB
0x06: -10.5dB
0x07: -12.5dB
0x08: -14.5dB
0x09: -16.5dB
0x0A: -18.5dB
0x0B: -20.5dB
0x0C: -22.5dB
0x0D: -24.5dB
0x0E: -26.5dB
0x0F: -28.5dB
TYPE
R/W
R/W
R/W
R/W
R/W
Record Path Sidetone
The record path sidetone is available to allow a low-level
copy of the recorded audio signal to be mixed back into
the playback audio signal. When enabled, the sidetone
can route the left channel, right channel, or both divided
by two and then summed back into the playback path
DSP. The sidetone digital gain can be programmed from
-0.5dB to -60.5dB (Table 31). The digital sidetone is com-
monly used in telephony to allow the speaker to hear their
own voice to provide a more natural user experience.
Ultra-Low Power Stereo Audio Codec
REC_B0[23:16]
REC_B1[23:16]
REC_B2[23:16]
REC_A1[23:16]
REC_A2[23:16]
10: Right channel
11: Left + right channel
DESCRIPTION
—
0x10: -30.5dB
0x11: -32.5dB
0x12: -34.5dB
0x13: -36.5dB
0x14: -38.5dB
0x15: -40.5dB
0x16: -42.5dB
0x17: -44.5dB
COEFFICIENT SEGMENT
REC_B0[15:8]
REC_B1[15:8]
REC_B2[15:8]
REC_A1[15:8]
REC_A2[15:8]
0x18: -46.5dB
0x19: -48.5dB
0x1A: -50.5dB
0x1B: -52.5dB
0x1C: -54.5dB
0x1D: -56.5dB
0x1E: -58.5dB
0x1F: -60.5dB
Maxim Integrated │ 98
REC_B0[7:0]
REC_B1[7:0]
REC_B2[7:0]
REC_A1[7:0]
REC_A2[7:0]