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參數(shù)資料
| 型號： | MAX9812HEXT+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO MONO AB MIC SC70-6 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點： | 麥克風(fēng)，關(guān)機，熱保護 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | SC-70-6 |
| 封裝/外殼： | 6-TSSOP，SC-88，SOT-363 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 1392 (CN2011-ZH PDF) |
| 其它名稱： | MAX9812HEXT+TDKR |
7
Maxim Integrated
MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Pin Description
Detailed Description
The MAX9812_/MAX9813_ are low-power fixed-gain
microphone amplifiers available in a single- or dual-
input configuration. The gain is set at 10V/V (20dB) with
a 400kHz, -3dB bandwidth. They also feature a low-
noise, integrated microphone input bias voltage.
Single/Dual Input
The MAX9812L/MAX9812H are single-input amplifiers
and the MAX9813L/MAX9813H are dual-input ampli-
fiers. All devices typically have an input impedance of
85k
. The inputs to the dual version are controlled
through a fast 2:1 mux, selectable through the IN1/IN2
pin. Driving IN1/IN2 high selects IN1 and driving the
IN1/IN2 low selects IN2. IN1/IN2 is designed to be dri-
ven by a logic high of
≥2V and a logic low
≤0.8V. The IN1/IN2 has a 10s switching time from one
channel to the other.
PC2001 Low-Noise Microphone BIAS
The MAX9812_/MAX9813_ provide a low-noise voltage
BIAS designed for biasing electret condenser micro-
phone (ECM) cartridges. The BIAS output is regulated
to typically 2.3V for the MAX9812L/MAX9813L and 4V
for the MAX9812H/MAX9813H. In the single-input ver-
sion (MAX9812_), the BIAS output can source up to
1mA. In the dual-input version (MAX9813_), the BIAS
output can source up to 2mA. The MAX9812H/
MAX9813H provides a PC2001-compliant BIAS voltage.
Output Stage
The MAX9812_/MAX9813_ rail-to-rail output (OUT) typical-
ly swings to within 100mV of the rails when driving 10k
.
The output DC bias point is set to 1.5V for the MAX9812L/
MAX9813L and 2.5V for the MAX9812H/MAX9813H.
Shutdown Mode
SHDN controls whether the MAX9812_/MAX9813_ is
active or in shutdown mode. Driving SHDN low forces a
low-power (100nA) shutdown mode. In this mode, the
OUT pin is set to a high-impedance state and the BIAS
pin is pulled down (70k
). Driving SHDN high enables
the MAX9812_/MAX9813_. SHDN is a high-impedance
input and cannot be left unconnected.
Driving Capacitive Loads
The MAX9812_/MAX9813_ output can drive up to 50pF
of capacitance without sustained oscillations.
Thermal Shutdown
The
thermal
shutdown
feature
protects
the
MAX9812_/MAX9813_ from destruction due to overheat-
ing caused by shorting the outputs. This protection fea-
ture causes OUT and BIAS to shut down and go high
impedance when the die temperature reaches +140
°C.
The device restarts after the die temperature falls below
+120
°C.
Applications Information
Power-Up
The MAX9812_/MAX9813_ output typically settles to
95% within 10ms after power-up.
Typical Application Circuit
Figure 1 shows the MAX9813H used as a preamplifier
with the MAX9760 3W audio power amplifier.
PIN
MAX9812L/
MAX9812H
MAX9813L/
MAX9813H
NAME
FUNCTION
13
SHDN
Active-Low Shutdown Input. Connect SHDN to VCC for normal operation. Connect SHDN
to GND for shutdown. SHDN is a high-impedance input; do not leave unconnected.
2
GND
Ground
3
1
OUT
Amplifier Output
48
VCC
Positive Supply. Bypass VCC to GND with a 0.1F capacitor.
5
7
BIAS
Low-Noise Microphone Bias Output. 2.3V output for MAX9812L/MAX9813L. 4V output for
MAX9812H/MAX9813H.
6
—
IN
Amplifier Input (MAX9812)
—
6
IN1
Amplifer Input 1 (MAX9813)
—
5
IN2
Amplifier Input 2 (MAX9813)
—
4
IN1/IN2
Input Selector. When IN1/IN2 is high, IN1 is selected. When IN1/IN2 low, IN2 is selected.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9812LEXT | 制造商:Maxim Integrated Products 功能描述:TINY, LOW-COST, SINGLE/DUAL-INPUT, FIXED-GAIN - Cut Tape Product |
| MAX9812LEXT+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP MCRPH 1CH MONO CLS-AB 6PIN SC-70 - Rail/Tube |
| MAX9812LEXT+T | 功能描述:傳聲器前置放大器 Single Fixed Gain Microphone Amp 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 |
| MAX9812LEXT-T | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9813HEKA | 制造商:Maxim Integrated Products 功能描述:TINY LOW-COST SINGLE/DUAL-INPUT - Cut Tape Product |
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