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LM1971M Datenblatt(PDF) 4 Page - Texas Instruments

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Teilenummer LM1971M
Bauteilbeschribung  Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
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LM1971
SNAS104B – FEBRUARY 1995 – REVISED APRIL 2013
www.ti.com
Pin Descriptions
VREFIN (1): The VREFIN pin provides the reference for the analog input signal. This pin should be biased at half of
the supply voltage, VDD, as shown in Figure 1 and Figure 19.
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 “VSS” 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; VSS
and Logic Ground. It is intended that the LM1971 always be operated using a single voltage supply
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
microcontroller 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.
VDD (7): The positive voltage supply should be placed to this pin.
IN (8): The analog input signal should be placed to this pin.
4
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