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参数资料
| 型号： | LM1971N/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP8 |
| 封装： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件页数： | 6/11页 |
| 文件大小： | 293K |
| 代理商： | LM1971N/NOPB |
Pin Descriptions
V
REFIN (1): The VREFIN pin provides the reference for the
analog input signal. This pin should be biased at half of the
supply voltage, V
OUT (2): The attenuated analog output signal comes from
this pin.
GND (3): The GND pin references the digital input signals
and is the lower voltage reference for the IC. Typically this
pin would be labeled “V
SS” but the ground reference for the
digital logic input control is tied to this same point. With a
higher pin-count there would generally be separate pins for
these functions; V
SS and Logic Ground. It is intended that
the LM1971 always be operated using a single voltage sup-
ply configuration, for which pin 3 (GND) should always be at
system ground. If a bipolar or split-supply configuration are
desired, level shifting circuitry is needed for the digital logic
control pins as they would be referenced through pin 3 which
would be at the negative supply. It is highly recommended,
however, that the LM1971 be used in a unipolar or
single-supply configuration.
LOAD (4): The LOAD input accepts a TTL or CMOS level
signal. This is the enable pin of the device, allowing data to
be clocked in while this input is low (0V). The GND pin is the
reference for this signal.
DATA (5): The DATA input accepts a TTL or CMOS level
signal. This pin is used to accept serial data from a micro-
controller that will be latched and decoded to change the
channel’s attenuation level. The GND pin is the reference for
this signal.
CLOCK (6): The CLOCK input accepts a TTL or CMOS level
signal. The clock input is used to load data into the internal
shift register on the rising edge of the input clock waveform.
The GND pin is the reference for this signal.
V
DD (7): The positive voltage supply should be placed to this
pin.
IN (8): The analog input signal should be placed to this pin.
Typical Performance Characteristics
Supply Current vs
Supply Voltage
Supply Current vs
Temperature
01235310
01235311
Noise Floor
Analog Measurement
THD+Nvs Freq and Amp
01235312
01235313
LM1971
www.national.com
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| LM1972 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Pot 2-Channel 78dB Audio Attenuator with Mute |
| LM1972M | 功能描述:衰减器 -IC RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰减:18 dB 容差: 阻抗: 功率额定值:30 dBm 安装风格:SMD/SMT 工作温度范围:- 40 C to + 85 C |
| LM1972M/NOPB | 功能描述:有源衰减器 RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
| LM1972MX | 功能描述:衰减器 -IC RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰减:18 dB 容差: 阻抗: 功率额定值:30 dBm 安装风格:SMD/SMT 工作温度范围:- 40 C to + 85 C |
| LM1972MX/NOPB | 功能描述:有源衰减器 RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
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