参数资料
| 型号： | MAX953ESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP SS LP 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 放大器，比较器 |
| 应用： | 智能卡 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
Power-Supply Bypassing
Power-supply bypass capacitors are not required if the
supply impedance is low. For single-supply applications,
it is good general practice to bypass VDD with a. 0.1F
capacitor to ground. Do not bypass the reference output.
Applications Circuits
Low-Frequency Radio Receiver for
Alarms and Detectors
The circuit in Figure 4 is useful as a front end for low-
frequency RF alarms. The unshielded inductor (M7334-
ND from Digikey) is used with capacitors C1A, C1B, and
C1C in a resonant circuit to provide frequency selectivity.
The op amp from a MAX952 amplifies the signal
received. The comparator improves noise immunity,
provides a signal strength threshold, and translates the
received signal into a pulse train. Carrier frequencies are
limited to around 10kHz. 10kHz is used in the example in
Figure 4.
The layout and routing of components for the amplifier
should be tight to minimize 60Hz interference and
crosstalk from the comparator. Metal shielding is
recommended to prevent RFI from the comparator or
digital circuitry from exciting the receiving antenna. The
transmitting antenna can be long parallel wires spaced
about 7.2cm apart, with equal but opposite currents.
Radio waves from this antenna will be detectable when
the receiver is brought within close proximity, but
cancel out at greater distances.
Infrared Receiver Front End for
Remote Controls and Data Links
The circuit in Figure 5 uses the MAX952 as a pin photo-
diode preamplifier and discriminator for an infrared
receiver. The op amp is configured as a Delyiannis-
Friend bandpass filter to reduce disturbances from
noise and eliminate low-frequency interference from
sunlight, fluorescent lights, etc. This circuit is applica-
ble for TV remote controls and low-frequency data links
up to 20kbps. Carrier frequencies are limited to around
10kHz. 10kHz is used in the example circuit.
Component layout and routing for the amplifier should
be tight to reduce stray capacitance, 60Hz interfer-
ence, and RFI from the comparator. Crosstalk from
comparator edges will distort the amplifier signal. In
order to minimize the effect, a lowpass RC filter is
added to the connection from the reference to the non-
inverting input of the op amp.
Sensor Preamp and Alarm Trigger for
Smoke Detectors
The high-impedance CMOS inputs of the MAX951–
MAX954 op amps are ideal for buffering high-imped-
ance sensors, such as smoke detector ionization cham-
bers, piezoelectric transducers, gas detectors, and pH
sensors. Input bias currents are typically less than 3pA
at room temperature. A 5A typical quiescent current
for the MAX953 will minimize battery drain without
resorting to complex sleep schemes, allowing continu-
ous monitoring and immediate detection.
Ionization-type smoke detectors use a radioactive source,
such as Americium, to ionize smoke particles. A positive
voltage on a plate attached to the source repels the posi-
tive smoke ions and accelerates them toward an outer
electrode connected to ground. Some ions collect on an
intermediate plate. With careful design, the voltage on this
plate will stabilize at a little less than one-half the supply
voltage under normal conditions, but rise higher when
smoke increases the ion current. This voltage is buffered
MAX951–MAX954
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
______________________________________________________________________________________
11
REF
0.1
F
0.1
F
1
2
π fC
10M
100k
1.2V
30k
VCC = 5V
COMP
AMP
C2
15pF, 5%
10kHz
5VP-P
C1
150pF, 5%
NEC
PH302B
NEC
SE307-C
51
R1A
49.9k
, 1%
R1B
49.9k
, 1%
R2
1.0M
,1%
LAYOUT-SENSITIVE AREA
MAX952
R1 x C1 = R2 x C2 =
5.1M
VCC
LAYOUT-SENSITIVE AREA
RADIOACTIVE
IONIZATION
CHAMBER
SMOKE SENSOR
COMP
4.7M
AMP
MAX953
Figure 5. Infrared Receiver Application
Figure 6. Sensor Preamp and Alarm Trigger Application
相关PDF资料 |
PDF描述 |
|---|---|
| VI-2TM-IV-F3 | CONVERTER MOD DC/DC 10V 150W |
| MAX953EPA+ | IC OP AMP SS LP 8-DIP |
| VI-2TM-IV-F1 | CONVERTER MOD DC/DC 10V 150W |
| MAX954EPA+ | IC OP AMP SS LP 8-DIP |
| VI-2T1-IV-F3 | CONVERTER MOD DC/DC 12V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX953ESA+ | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX953ESA+T | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX953ESA-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX953EUA | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX953EUA+ | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
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