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參數(shù)資料
| 型號： | LM1971MDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 290K |
| 代理商： | LM1971MDC |
Pin Description
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
DD, as shown in Figure 1 and Figure
6.
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 volt-
age supply configuration, for which pin 3 (GND) should al-
ways be at system ground. If a bipolar or split-supply con-
figuration 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
DS012353-10
Supply Current vs
Temperature
DS012353-11
Noise Floor
Analog Measurement
DS012353-12
THD+Nvs Freq and Amp
DS012353-13
THD+Nvs Freq and Amp
DS012353-14
Noise Floor Spectrum by FFT
DS012353-15
www.national.com
4
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| LM1971MX | 功能描述:衰減器 -IC RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰減:18 dB 容差: 阻抗: 功率額定值:30 dBm 安裝風(fēng)格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| LM1971MX/NOPB | 功能描述:衰減器 -IC RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰減:18 dB 容差: 阻抗: 功率額定值:30 dBm 安裝風(fēng)格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| LM1971N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM1971 Overture⑩ Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute |
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| LM1972 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Pot 2-Channel 78dB Audio Attenuator with Mute |
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