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参数资料
| 型号： | MAX9717DETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/21页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 1.4W STER 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 1.4W x 1 @ 4 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，关机，热保护 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
Adjustable Gain
Gain-Setting Resistors
External feedback resistors set the gain of the
MAX9716 and MAX9717A. Resistors RF and RIN (see
Figure 2
) set the gain of the amplifier as follows:
Where AV is the desired voltage gain. Hence, an RIN of
20k
and an RF of 20k yields a gain of 2V/V, or 6dB.
RF can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.
The gain of the MAX9717 in a single-ended output
configuration is half the gain when configured as BTL
output. Choose RF between 10k and 50k for the
MAX9716 and MAX9717A. Gains for the MAX9717B/C/D
are set internally.
Input Filter
CIN and RIN form a highpass filter that removes the DC
bias from an incoming signal. The AC-coupling capaci-
tor allows the amplifier to bias the signal to an optimal
DC level. Assuming zero-source impedance, the -3dB
point of the highpass filter is:
Setting f-3dB too high affects the low-frequency
response of the amplifier. Use capacitors with
dielectrics that have low-voltage coefficients, such as
tantalum or aluminum electrolytic. Capacitors with high-
voltage coefficients, such as ceramics, can increase
distortion at low frequencies.
Output-Coupling Capacitor
The MAX9717 require output-coupling capacitors to
operate in single-ended (headphone) mode. The out-
put-coupling capacitor blocks the DC component of the
amplifier output, preventing DC current from flowing to
the load. The output capacitor and the load impedance
form a highpass filter with a -3dB point determined by:
As with the input capacitor, choose COUT such that
f-3dB is well below the lowest frequency of interest.
Setting f-3dB too high affects the amplifier’s low-fre-
quency response. Load impedance is a concern when
choosing COUT. Load impedance can vary, changing
the -3dB point of the output filter. A lower impedance
increases the corner frequency, degrading low-fre-
quency response. Select COUT such that the worst-
case load/COUT combination yields an adequate
response. Select capacitors with low ESR to minimize
resistive losses and optimize power transfer to the load.
Differential Input
The MAX9716 can be configured for a differential input.
The advantage of differential inputs is that any com-
mon-mode noise is attenuated and not passed through
the amplifier. This input improves noise rejection and
provides common-mode rejection (Figure 3). External
components should be closely matched for high
CMRR. Figure 4 shows the MAX9716 configured for a
differential input.
f
RC
dB
L OUT
=
3
1
2
π
f
RC
dB
IN IN
=
3
1
2
π
A
R
V
F
IN
=
2
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
______________________________________________________________________________________
11
OUT-
OUT+
MAX9716
RF
IN-
IN+
BIAS
RIN
CIN
AUDIO
INPUT
Figure 2. Setting the MAX9716/MAX9717A Gain
FREQUENCY (Hz)
CMRR
(dB)
10k
1k
100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10
100k
VRIPPLE = 200mVP-P
RL = 8
CBIAS = 1
F
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
Figure 3. CMRR with Differential Input
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9717DEUA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9717DEUA+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH/SPKR 1CH MONO 1.4W/0.155W CLS-AB 8PIN UMAX EP - Rail/Tube |
| MAX9717DEUA+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX9718AEBL | 制造商:Maxim Integrated Products 功能描述:LOW-COST MONO/STEREO 1.4W DIFFERE - Rail/Tube |
| MAX9718AEBL+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 1.4W CLS-AB 9UCSP - Rail/Tube |
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