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參數(shù)資料
| 型號(hào)： | MAX9945ATT+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 12/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP MOS-INPT LP/LN 6TDFN-EP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 2.2 V/µs |
| 增益帶寬積： | 3MHz |
| 電流 - 輸入偏壓： | 0.05pA |
| 電壓 - 輸入偏移： | 600µV |
| 電流 - 電源： | 400µA |
| 電流 - 輸出 / 通道： | 25mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 38 V，±2.4 V ~ 19 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-WDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 6-TDFN 裸露焊盤（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | MAX9945ATT+TDKR |
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Detailed Description
The MAX9945 features a combination of low input cur-
rent and voltage noise, rail-to-rail output voltage swing,
wide supply voltage range, and low-power operation.
The MOS inputs on the MAX9945 make it ideal for use
as transimpedance amplifiers and high-impedance
sensor interface front-ends in medical and industrial
applications. The MAX9945 can interface with small
signals from either current-sources or high-output
impedance voltage sources. Applications include pho-
todiode pulse oximeters, pH sensors, capacitive pres-
sure sensors, chemical analysis equipment, smoke
detectors, and humidity sensors.
A high 130dB open-loop gain (typ) and a wide supply
voltage range, allow high signal-gain implementations
prior to signal conditioning circuitry. Low quiescent
supply current makes the MAX9945 compatible with
portable systems and applications that operate under
tight power budgets. The combination of excellent THD,
low voltage noise, and MOS inputs also make the
MAX9945 ideal for use in high-performance active fil-
ters for data acquisition systems and audio equipment.
Low-Current, Low-Noise Input Stage
The MAX9945 features a MOS-input stage with only
50fA (typ) of input bias current and a low 1fA/√Hz (typ)
input current-noise density. The low-frequency input
voltage noise is a low 2VP-P (typ). The input stage
accepts a wide common-mode range, extending from
the negative supply, VEE, to within 1.2V of the positive
supply, VCC.
Rail-to-Rail Output Stage
The MAX9945 output stage swings to within 50mV (typ)
of either power-supply rail with a 100kΩ load and pro-
vides a 3MHz GBW with a 2.2V/s slew rate. The
device is unity-gain stable, and unlike other devices
with a low quiescent current, can drive a 120pF capaci-
tive load without compromising stability.
Applications Information
High-Impedance Sensor Front Ends
High-impedance sensors can output signals of interest
in either current or voltage form. The MAX9945 inter-
faces to both current-output sensors such as photo-
diodes and potentiostat sensors, and high-impedance
voltage sources such as pH sensors.
For current-output sensors, a transimpedance amplifier
is the most noise-efficient method for converting the
input signal to a voltage. High-value feedback resistors
are commonly chosen to create large gains, while feed-
back capacitors help stabilize the amplifier by cancel-
ing any zeros in the transfer function created by a
highly capacitive sensor or cabling. A combination of
low-current noise and low-voltage noise is important for
these applications. Take care to calibrate out photodi-
ode dark current if DC accuracy is important. The high
bandwidth and slew rate also allows AC signal pro-
cessing in certain medical photodiode sensor applica-
tions such as pulse oximetry.
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
_______________________________________________________________________________________
7
Pin Description
PIN
TDFN-EP
MAX
NAME
FUNCTION
1
6
OUT
Amplifier Output
24
VEE
Negative Power Supply. Bypass VEE with 0.1F ceramic and 4.7F electrolytic
capacitors to quiet ground plane if different from VEE.
3
IN+
Noninverting Amplifier Input
4
2
IN-
Inverting Amplifier Input
5
1, 5, 8
N.C.
No Connection. Not internally connected.
67
VCC
Positive Power Supply. Bypass VCC with 0.1F ceramic and 4.7F electrolytic capacitors
to quiet ground plane or VEE.
——
EP
Exposed Pad (TDFN Only). Connect to VEE externally. Connect to a large copper plane
to maximize thermal performance. Not intended as an electrical connection (TDFN only).
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參數(shù)描述 |
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| MAX9945AUA+ | 功能描述:運(yùn)算放大器 - 運(yùn)放 38V MOS-Input Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX9945AUA+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 38V MOS-Input Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX9945EVKIT+ | 功能描述:放大器 IC 開(kāi)發(fā)工具 38V MOS-Input Op Amp RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9947ETE+ | 功能描述:射頻收發(fā)器 AISG Interface RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| MAX9947ETE+T | 功能描述:射頻收發(fā)器 AISG Interface RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
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