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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
ELECTRICAL CHARACTERISTICS (continued)
(V IN1 = V IN2 = V IN3 = V DD = 3.6V, V AGND = V PGND1 = V PGND2 = 0V, circuit of Figure 2, T A = -40°C to +85°C, unless otherwise noted.
Typical values are at T A = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
AUDIO AMPLIFIER
Common-Mode Bias Voltage
0.95 x
(V IN3 / 2)
V IN3 / 2
1.05 x
(V IN3 / 2)
V
Output Offset Voltage
Common-Mode Input Voltage
V AIN+ = V AIN- = V IN3 / 2, audio gain = 0dB
0.5
±1
V IN3 -
1.2V
mV
V
-3
0
3
6
Audio Gain
Table 15, B3:B0
9
12
dB
15
18
21
24
Audio Gain Accuracy
-3
+3
%
Audio gain = -3dB
Audio gain = 0dB
Audio gain = 3dB
Audio gain = 6dB
54.4
49.1
43.1
36.8
99.0
89.2
78.4
66.9
143.5
129.3
113.7
97.0
Input Resistance
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Audio gain = 9dB
Audio gain = 12dB
Audio gain = 15dB
Audio gain = 18dB
Audio gain = 21dB
Audio gain = 24dB
V IN2 = V IN3 = 3.6V
f = 1kHz, V IN2 = V IN3 = 3.6V
V AIN+ = V AIN- = V IN3 / 2,
100mV P-P at V IN3
f = 217Hz
f = 20kHz
30.5
24.6
19.3
14.8
11.1
8.2
55.5
44.7
35.2
26.9
20.2
15.0
46
46
65
50
80.5
64.8
51.0
39.0
29.3
22.0
k Ω
dB
dB
Output Power
THD+N = 1%,
f = 1kHz
(Note 4)
V IN3 = 3.6V
V IN3 = 5V
R L = 8 Ω
R L = 4 Ω
R L = 8 Ω
R L = 4 Ω
0.36
0.8
0.5
0.85
1.1
2.0
W
Total Harmonic Distortion Plus
Noise
R L = 8 Ω , f = 1kHz, P OUT = 0.25W,
V IN2 = V IN3 = 3.6V
0.05
%
4
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