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參數(shù)資料
| 型號： | MAX4409ETP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .08W STER AB 20TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類型： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 80mW x 2 @ 16 歐姆 |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 特點： | 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 20-TQFN-EP（4x4） |
| 封裝/外殼： | 20-WFQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
12
______________________________________________________________________________________
driver. The negative supply voltage appears on the
PVSS pin. A typical application is a negative supply to
adjust the contrast of LCD modules.
When considering the use of PVSS in this manner, note
that the charge-pump voltage at PVSS is roughly pro-
portional to -VDD and is not a regulated voltage. The
charge-pump output impedance plot appears in the
Typical Operating Characteristics.
Component Selection
Gain-Setting Resistors
External feedback components set the gain of the
MAX4409. Resistors RF and RIN (see Typical Application
Circuit) set the gain of each amplifier as follows:
Choose feedback resistor values of 10k
Ω. Values other
than 10k
Ω increase VOS due to the input bias current,
which in turn increases the amount of DC current flow
to the load. Resistors RIN, R2, RF, and R1 must be of
equal value for best results. Use high-tolerance resis-
tors for best matching and CMRR. For example, the
worst-case CMRR attributed to a 1% resistor mismatch
is -34dB. This is the worst case, and typical resistors do
not affect CMRR as drastically. The effect of resistor
mismatch is shown in Figure 5. If all resistors match
exactly, then any voltage applied to node A should be
duplicated on OUT so no net differential voltage
appears between node A (normally the HP jack socket
GND) and OUT. For resistors with a tolerance of n%,
the worst mismatch is found when RIN and R1 are at
+n%, and RF and R2 are at -n%. If all four resistors are
nominally the same value, then 2n% of the voltage at A
appears between A and OUT.
Packaged resistor arrays can provide well-matched
components for this type of application. Although their
absolute tolerance is not well controlled, the internal
matching of resistors can be very good. At higher fre-
quencies, the rejection is usually limited by PC board
layout; care should be taken to make sure any stray
capacitance due to PC board traces on node N1 match-
es those on node N2. Ultimately, CMRR performance is
limited by the amplifier itself (see Electrical
Characteristics).
Compensation Capacitor
The stability of the MAX4409 is affected by the value of
the feedback resistor (RF). The combination of RF and
the input and parasitic trace capacitance introduces an
additional pole. Adding a capacitor in parallel with RF
compensates for this pole. Under typical conditions
with proper layout, the device is stable without the
additional capacitor.
Input Filtering
The input capacitor (CIN), in conjunction with RIN, forms a
highpass filter that removes the DC bias from an incom-
ing signal (see Typical Application Circuit). The AC-cou-
pling capacitor allows the amplifier to bias the signal to
an optimum DC level. Assuming zero-source impedance,
the -3dB point of the highpass filter is given by:
f
RC
dB
IN IN
-
2
3
1
=
π
AV =
R
F
IN
MAX4409
R1
N2
N1
R2
RIN
RF
A
OUT
Figure 5. Common-Mode Sense Equivalent Circuit
100
10
1
0.1
0.01
0.001
0
100
150
50
200
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409
fig04
OUTPUT POWER (mW)
VDD = 3V
AV = -1V/V
RL = 16
Ω
fIN = 10kHz
THD+N
(%)
OUTPUTS IN
PHASE
ONE
CHANNEL
OUTPUTS
180
° OUT OF
PHASE
Figure 4. Output Power vs. THD+N with Inputs In/Out of Phase
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| MAX440C/D | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Maxim Integrated 通道數(shù)量: 開關(guān)數(shù)量: 開啟電阻（最大值）: 開啟時間（最大值）:40 ns 關(guān)閉時間（最大值）:10 ns 傳播延遲時間: 工作電源電壓:+/- 5 V 工作電源電流:40 mA 最大工作溫度:+ 70 C 安裝風(fēng)格: 封裝 / 箱體: |
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