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參數(shù)資料
| 型號： | MAX4063 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 16-bit fixed point DSP with ROM 100-LQFP -40 to 125 |
| 中文描述： | 差分麥克風(fēng)前置放大器，內(nèi)部偏置并可完全關(guān)斷 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 404K |
| 代理商： | MAX4063 |
M
Differential Microphone Preamplifier with
Internal Bias and Complete Shutdown
_______________________________________________________________________________________
9
where:
R
ADJ
is placed between AUX_IN and ADJ.
Input Capacitors
The two differential microphone inputs and the single-
ended auxiliary input of the MAX4063 have on-chip
bias components, allowing the user to AC-couple any
signals into the input. The input resistance is 100k
(typ), so the capacitor size may be chosen accordingly
to define the LF rolloff desired. This can be calculated
as:
C
IN
= 1 / (2
π
f
CUT
R
IN
)
This assumes a low source impedance is driving the
inputs.
A further consideration for the differential input is the
effect of these series input capacitors on low-frequency,
common-mode rejection. Any mismatch in the values of
these two capacitors degrades the CMRR at frequen-
cies where the impedance of the capacitor is significant
compared to the input resistance of the amplifier
—
this is
usually most noticeable at low frequencies. One way to
avoid the need for matched or tight tolerance capaci-
tors is to deliberately oversize the values on the differ-
ential inputs and to set the lower 3dB point (f
CUT
) of the
amplifier by sizing the output capacitor appropriately.
The input impedance matching on the differential input
is typically 1%, allowing input capacitor matching to be
effective at improving low-frequency PSRR.
Common-Mode Rejection Ratio
The common-mode rejection ratio (CMRR) refers to the
amount of rejection that the amplifier is capable of pro-
viding to any signal applied equally to the IN+ and IN-
inputs. In the case of amplifying low-level microphone
signals in noisy digital environments, it is a key figure of
merit. In audio circuits, this is generally measured for
V
IN
as an AC signal:
CMRR(dB) = A
DM
/ A
CM
where A
DM
is the differential gain, A
CM
is the common-
mode gain.
AV
V
V
AUX
OUT
OUT
AUX_IN
=
V
Figure 1. MAX4063 with Auxiliary Input Configuration
ADJ7
AUX_IN
12
5
IN-
IN+
10
9
6
V
CC
2.4V TO 5.5V
MAX4063
2
INT/AUX
8
OUT
OUT 4
GND
11
SHDN
V
BIAS
SHDN
V
CC
3
G2
G1
BIAS
1
14
R
BIAS
C
BIAS
100k
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4063ETE | Replaced by TMS320VC33 : Digital Signal Processor 132-BQFP 0 to 70 |
| MAX4063EUD | Replaced by TMS320VC33 : Digital Signal Processor 132-BQFP |
| MAX4066CEE | Low-Cost, Low-Voltage, Quad, SPST, CMOS Analog Switches |
| MAX4066AEEE | Circular Connector; No. of Contacts:15; Series:MS27466; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| MAX4066A | Low-Cost.Low-Voltage.Quad.SPST.CMOS Analog Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4063_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Differential Microphone Preamplifier with Internal Bias and Complete Shutdown |
| MAX4063ETE | 功能描述:傳聲器前置放大器 RoHS:否 制造商:Texas Instruments 可用增益調(diào)整:Digital control, 65 dB to 0 dB 共模抑制比（最小值）: 輸入補償電壓: 最大輸入電阻:9200 Ohms 最大工作溫度:+ 85 C 封裝 / 箱體:SSOP-28 封裝:Tube |
| MAX4063ETE+ | 功能描述:傳聲器前置放大器 Differential Mic Preamplifier RoHS:否 制造商:Texas Instruments 可用增益調(diào)整:Digital control, 65 dB to 0 dB 共模抑制比（最小值）: 輸入補償電壓: 最大輸入電阻:9200 Ohms 最大工作溫度:+ 85 C 封裝 / 箱體:SSOP-28 封裝:Tube |
| MAX4063ETE+T | 功能描述:傳聲器前置放大器 Differential Mic Preamplifier RoHS:否 制造商:Texas Instruments 可用增益調(diào)整:Digital control, 65 dB to 0 dB 共模抑制比（最小值）: 輸入補償電壓: 最大輸入電阻:9200 Ohms 最大工作溫度:+ 85 C 封裝 / 箱體:SSOP-28 封裝:Tube |
| MAX4063ETE-T | 功能描述:傳聲器前置放大器 RoHS:否 制造商:Texas Instruments 可用增益調(diào)整:Digital control, 65 dB to 0 dB 共模抑制比（最小值）: 輸入補償電壓: 最大輸入電阻:9200 Ohms 最大工作溫度:+ 85 C 封裝 / 箱體:SSOP-28 封裝:Tube |
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