max98089 Maxim Integrated Products, Inc., max98089 Datasheet - Page 125
max98089
Manufacturer Part Number
max98089
Description
Low-power, Stereo Audio Codec With Flexsound Technology
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX98089.pdf
(131 pages)
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The value of the flying capacitor (connected between
C1N and C1P) affects the output resistance of the charge
pump. A value that is too small degrades the device’s
ability to provide sufficient current drive, which leads to a
loss of output voltage. Increasing the value of the flying
capacitor reduces the charge-pump output resistance to
an extent. Above 1FF, the on-resistance of the internal
switches and the ESR of external charge- pump capaci-
tors dominate.
Table 40. Unused Pins
RECN/RXINN
RECP/RXINP
SPKRGND
SPKLGND
SPKRVDD
SDOUTS1
SPKLVDD
JACKSNS
LRCLKS1
DVDDS1
BCLKS1
HPGND
SDINS1
HPVDD
SPKRN
HPSNS
SPKRP
SPKLN
HPVSS
SPKLP
NAME
INB2
C1N
HPR
C1P
HPL
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Charge-Pump Flying Capacitor
Always connect
Always connect
Always connect
Always connect
CONNECTION
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
AGND
AGND
AGND
DVDD
Low-Power, Stereo Audio Codec
with FlexSound Technology
The holding capacitors (bypassing HPVSS to HPGND
and HPVDD to HPGND) value and ESR directly affect the
ripple at HPVSS and HPVDD. Increasing the capacitor’s
value reduces output ripple. Likewise, decreasing the
ESR reduces both ripple and output resistance. Lower
capacitance values can be used in systems with low
maximum output power levels. See the Output Power
vs. Load Resistance graph in the Typical Operating
Characteristics section for more information
Table 40 shows how to connect the IC’s pins when circuit
blocks are unused.
MIC1P/DIGMICDATA
MIC1N/DIGMICCLK
INA2/MICEXTN
INA1/MICEXTP
SDOUTS2
LRCLKS2
MICBIAS
DVDDS2
BCLKS2
SDINS2
MIC2N
NAME
DGND
MIC2P
AGND
MCLK
DVDD
AVDD
PVDD
INB1
REG
SDA
SCL
REF
IRQ
Charge-Pump Holding Capacitors
MAX98089
Always connect
Always connect
Always connect
Always connect
Always connect
Always connect
Always connect
Always connect
Always connect
Always connect
CONNECTION
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
Unconnected
AGND
DVDD
Unused Pins
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