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LM1972MXNOPB Datenblatt(PDF) 10 Page - Texas Instruments

Teilenummer LM1972MXNOPB
Bauteilbeschribung  LM1972 關Pot 2-Channel 78dB Audio Attenuator with Mute
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LM1972
SNAS094D – APRIL 1995 – REVISED MARCH 2013
www.ti.com
The mute function is obtained during power-up of the device or by sending any binary data of 01111111 and
above (to 11111111) serially to the device. The device may be placed into mute from a previous attenuation
setting by sending any of the above data. This allows the designer to place a mute button onto his system which
could cause a microcontroller to send the appropriate data to a
μPot and thus mute any or all channels. Since
this function is achieved through software, the designer has a great amount of flexibility in configuring the
system.
DC INPUTS
Although the
μPot was designed to be used as an attenuator for signals within the audio spectrum, the device is
capable of tracking an input DC voltage. The device will track DC voltages to a diode drop above each supply
rail.
One point to remember about DC tracking is that with a buffer at the output of the
μPot, the resolution of DC
tracking will depend upon the gain configuration of that output buffer and its supply voltage. It should also be
remembered that the output buffer's supply voltage does not have to be the same as the
μPot's supply voltage.
This could allow for more resolution when DC tracking.
SERIAL DATA FORMAT
The LM1972 uses a 3-wire serial communication format that is easily controlled by a microcontroller. The timing
for the 3-wire set, comprised of DATA-IN, CLOCK, and LOAD/SHIFT is shown in Figure 3. Figure 22 exhibits in
block diagram form how the digital interface controls the tap switches which select the appropriate attenuation
level. As depicted in Figure 3, the LOAD/SHIFT line is to go low at least 150 ns before the rising edge of the first
clock pulse and is to remain low throughout the transmission of each set of 16 data bits. The serial data is
comprised of 8 bits for channel selection and 8 bits for attenuation setting. For both address data and attenuation
setting data, the MSB is sent first and the 8 bits of address data are to be sent before the 8 bits of attenuation
data. Please refer to Figure 20 to confirm the serial data format transfer process.
Table 1. LM1972 Micropot Attenuator
Register Set Description
MSB:
LSB
Address Register (Byte 0)
0000 0000
Channel 1
0000 0001
Channel 2
0000 0010
Channel 3
Data Register (Byte 1)
Contents
Attenuation Level dB
0000 0000
0.0
0000 0001
0.5
0000 0010
1.0
0000 0011
1.5
: : : : :
: :
0001 1110
15.0
0001 1111
15.5
0010 0000
16.0
0010 0001
16.5
0010 0010
17.0
: : : : :
: :
0101 1110
47.0
0101 1111
47.5
0110 0000
48.0
0110 0001
49.0
0110 0010
50.0
: : : : :
: :
10
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