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| 型号： | MAX9888EWY+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 111/115页 |
| 文件大小： | 0K |
| 描述： | IC CODEC AUDIO FLEXSOUND 63WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive®, FLEXSOUND™ |
| 类型： | D 类 |
| 输出类型： | 3 通道，带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 1.37W x 2 @ 8 欧姆; 40mW x 2 @ 16 欧姆 |
| 电源电压： | 2.8 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，I²S，麦克风，静音，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 63-WLP |
| 封装/外壳： | 63-WFBGA，WLCSP |
| 包装： | 带卷 (TR) |
| 配用： | MAX9888EVKIT+-ND - KIT EVALUATION FOR MAX9888 |
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Stereo Audio CODEC
with FlexSound Technology
MAX9888
95
Headphone Amplifier
The IC’s headphone amplifier integrates Maxim’s
DirectDrive architecture to eliminate the need for large
DC-blocking capacitors. Traditional single-supply head-
phone amplifiers have outputs biased at a nominal
DC voltage (typically half the supply). Large coupling
capacitors are needed to block this DC bias from the
headphone. Without these capacitors, a significant
amount of DC current flows to the headphone, resulting
in unnecessary power dissipation and possible damage
to both the headphone and headphone amplifier.
The DirectDrive architecture uses a charge pump to
create an internal negative supply voltage. This allows
the IC’s headphone outputs to be biased at GND while
operating from a single supply (Figure 29). Without a DC
component, there is no need for the large DC-blocking
capacitors. Instead of two large (220FF, typ) capaci-
tors, the IC charge pump requires two small ceramic
capacitors, conserving board space, reducing cost, and
improving the frequency response of the headphone
amplifier. There is a low DC voltage on the amplifier out-
puts due to amplifier offset. However, the offset of the IC
is typically Q0.2mV, which, when combined with a 32I
load, results in less than 6FA of DC current flow to the
headphones.
In addition to the cost and size disadvantages of
the DC-blocking capacitors required by conventional
headphone amplifiers, these capacitors limit the ampli-
fier’s low-frequency response and can distort the audio
signal. The DC-blocking capacitor not only blocks DC,
but also low-frequency audio. Improving the low-fre-
quency response of a conventional headphone amplifier
requires increasing the capacitor size, further adding
to the cost and size of the solution. Due to the voltage
coefficient of the capacitors used for DC blocking, they
introduce significant distortion near the corner frequency
of the highpass filter they create. This distortion further
degrades the low-frequency audio quality.
Table 27. Distortion Limiter Registers
REGISTER
BIT
NAME
DESCRIPTION
0x44
7
THDCLP
Distortion Limit
Measured in % THD+N.
6
VALUE
THD+N LIMIT (%)
VALUE
THD+N LIMIT (%)
0x0
Limiter disabled
0x8
12
5
0x1
< 1
0x9
14
0x2
1
0xA
16
0x3
2
0xB
18
4
0x4
4
0xC
20
0x5
6
0xD
21
0x6
8
0xE
22
0x7
10
0xF
24
2
THDT1
Distortion Limiter Release Time Constant
Duration of time required for the speaker amplifier’s output gain to adjust back to the
nominal level after a large signal has passed.
000 = 6.2s
001 = 3.1s
010 = 1.6s
011 = 815ms
100 = 419ms
101 = 223ms
110 = 116ms
111 = 76ms
1
0
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