Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
LDOIN
= V
= V
= 3.7V, V
= V
= 0V. Input signal applied at INA configured single-ended, preamp gain = 0dB,
PGND
PVDD
SHDN
GND
HPLVOL = HPRVOL= SPKVOL = 0dB, speaker loads (Z
) connected between OUTP and OUTN. Headphone loads (R ) con-
SPK HP
nected from HPL or HPR to GND. SDA and SCL pullup voltage = 1.8V. Z
= J, R = J. C
= C
= C
= C
HPVSS BIAS
SPK
HP
C1P-C1N
HPVDD
= 1FF. T = T
to T , unless otherwise noted. Typical values are at T = +25NC.) (Note 1)
MAX A
A
MIN
PARAMETER
CHARGE PUMP
SYMBOL
CONDITIONS
= 0V
MIN
TYP
MAX
UNITS
V
V
V
V
V
V
V
= V
= V
= V
80
83
85
HPL
HPL
HPL
HPR
HPR
HPR
Charge-Pump Frequency
= 0.2V
= 0.5V
665
500
1.8
kHz
, V
HPL HPR
> V
TH
TH
TH
TH
Positive Output Voltage
Negative Output Voltage
V
V
V
HPVDD
, V
HPL HPR
< V
> V
< V
0.9
, V
HPL HPR
-1.8
-0.9
V
HPVSS
, V
HPL HPR
Output voltage at which the charge pump
switches between fast and slow clock
V
0.1
0.16
0.46
32
0.21
0.52
TH1
TH2
Headphone Output Voltage
Threshold
V
Output voltage at which the charge pump
V
0.40
switches modes, V
rising or falling
OUT
Time it takes for the charge pump to
transition from invert to split mode
ms
Mode Transition Timeouts
Time it takes for the charge pump to
transition from split to invert mode
20
Fs
HEADPHONE AMPLIFIERS
T
T
= +25NC volume at mute
Q0.15
Q0.5
Q0.6
A
A
Output Offset Voltage
V
OS
mV
= +25NC, HP_VOL = 0dB, HP_MIX = 0x1,
IN_DIFF = 0
Peak voltage, T =
A
Into shutdown
-74
-74
+25NC, A-weighted, 32
samples per second,
volume at mute
Click-and-Pop Level
K
CP
dBV
Out of shutdown
(Note 2)
V
= 2.5V to 5.5V
70
85
84
LDOIN
f = 217Hz,
= 200mV
V
RIPPLE
P-P
P-P
P-P
Power-Supply Rejection Ratio
PSRR
T
= +25NC (Note 2)
dB
A
f = 1kHz,
= 200mV
80
62
V
RIPPLE
f = 20kHz,
= 200mV
V
RIPPLE
R
R
R
= 16I
40
23
HP
HP
HP
= 32I
= 32I,
THD+N = 1%,
f = 1kHz
Output Power
P
OUT
mW
%
LPMODE = 1,
LP gain = 3dB
34
T
= +25NC, HPL to HPR, volume at
maximum, HPLMIX = 0x01, HPRMIX = 0x02,
IN_DIFF = 0
A
Channel-to-Channel Gain
Tracking
Q0.3
Q2.5
7