National Semiconductor LMC1982 Technical data

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LMC1982 Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs
General Description
The LMC1982 is a monolithic integrated circuit that provides volume, balance, tone (bass and treble), enhanced stereo, and loudness controls and selection between two pairs of stereo inputs. These functions are digitally controlled through a three-wirecommunicationinterface. There are two digital inputs for easy interface to other audio peripherals such as stereo decoders. The LMC1982 is designed for line level input signals (300 mV–2V) and has a maximum gain of
−0.5 dB. Volumeis set at minimum and tone controls are flat when supply voltage is first applied.
Low noise and distortion result from using analog switches and poly-silicon resistor networks in the signal path.
Additional tone control can be achieved using the LMC835 stereo 7-band graphic equalizer connected to the LMC1982’s SELECT OUT/SELECT IN external processor loop.
Features
n Low noise and distortion n Two pairs of stereo inputs
December 1994
n Enhanced stereo function n Loudness compensation n 40 position 2 dB/step volume attenuator plus mute n Independent left and right volume controls n Low noise-suitable for use with DNR
reduction
n External processor loop n Signal handling suitable for compact discs n Pop-free switching n Serially programmable: INTERMETAL bus (IM) interface n 6V to 12V single supply operation n 28 Pin DIP or PLCC package
®
and Dolby®noise
Applications
n Stereo television n Music reproduction systems n Sound reinforcement systems n Electronic music (MIDI) n Personal computer audio control
LMC1982 Digitally-Controlled Stereo Tone and Volume Circuit with Two Selectable Stereo Inputs
Block and Connection Diagrams
DS011028-1
DNR®is a registered trademark of National Semiconductor Corporation.
®
Dolby
is a registered trademark of Dolby Labs.
© 1999 National Semiconductor Corporation DS011028 www.national.com
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Supply Voltage (V Voltage at any Pin GND − 0.2V to V
Input Current at any Pin (Note 3) 5 mA Package Input Current (Note 3) 20 mA Power Dissipation (Note 4) 500 mW Junction Temperature +125˚C Storage Temperature −65˚C to +150˚C Lead Temperature
+
− GND) 15V
+
0.2V
N Package,
(Soldering, 10 Seconds) +260˚C
V Package,
(Vapor Phase, 60 Seconds) 215˚C
Infrared, (15 Seconds) 220˚C
ESD Susceptability (Note 5) 2 kV
+
Operating Ratings(Notes 1, 2)
Temperature Range T
LMC1982CIN, LMC1982CIV −40˚C TA≤ +85˚C
Supply Voltage Range (V
+−V−
) 6Vto12V
MIN
TA≤ T
MAX
Electrical Characteristics
The following specifications apply for V 0 dB, treble=0 dB, enhanced stereo is off, and loudness is off unlessotherwise specified. All limits apply for T
+
=
=
9V, f
1 kHz, input signal (300 mV) applied to INPUT 1, volume=0 dB, bass
IN
=
=
T
+25˚C.
A
J
Symbol Parameter Conditions Typical Limit Unit
(Note 6) (Note 7) (Limit) I V
Supply Current 15 25 mA (max)
S
Input Voltage Clipping Level (1,.0%THD), 2.3 2.0 V
IN
rms
Select Out (Pins 6, 23)
THD Total Harmonic Distortion Left and Right channels;
Output Pins 13, 16
=
V
0.3 V
IN
V
IN
V
IN
V
IN
rms
=
f
100 Hz, 1 kHz, 10 kHz
IN
=
2.0 V
rms
=
f
100 Hz, 1 kHz
IN
=
2.0 V
rms
=
f
10 kHz
IN
=
0.5 V
rms
; 0.008 0.1
; 0.4 1.0
; 0.5 1.0
; Bass and Treble 0.07 0.5
%
%
%
%
(max)
(max)
(max)
(max)
Tone Controls Set at Maximum
=
V
IN
Attenuator at −20 dB, Bass and Treble 0.06 0.15
0.3 V
; Volume
rms
%
(max)
Tone Controls Set at Maximum
DC Shifts V
=
IN
; Between Any 2.0 4.0 mV (max)
0.3 V
rms
Two Adjacent Control Settings
=
V
IN
; 18 20 mV (max)
0.3 V
rms
All Mode and Input Positions
R
AC Output Impedance Pins 6, 23, (470to Ground at Input) 150 200 (max)
OUT
Pins 13, 16 26 40 (max)
R
AC Input Impedance Pins 4, 5, 24, 25 50 72 k(max)
IN
35 k(min)
Volume Attenuator Range Pins 13, 16; Volume 0.5 1.5 dB (max)
Attenuation at 0100010XXX000000 (0 dB)
0100010XXX101XXX (80 dB); 80 78 dB (min)
(Relative to Attenuation at 82 dB (max) the 0 dB Setting)
Volume Step Size All Volume Attenuation Settings
from 0100010XXX101XXX (80 dB) to 2.0 1.5 dB (min) 0100010XXX000000 (0 dB) (Note 9) 2.5 dB (min)
=
(min)
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Electrical Characteristics (Continued)
+
=
The following specifications apply for V 0 dB, treble=0 dB, enhanced stereo is off, and loudness is off unlessotherwise specified. All limits apply for T
Symbol Parameter Conditions Typical Limit Unit
Channel-to-Channel Volume All Volume Attenuation Settings Tracking Error from 0100010XXX101XXX (80 dB)
Mute Attenuation V Bass Gain Range f
Bass Tracking Error f Bass Step Size f
Treble Gain Range f
Treble Tracking Error f Treble Step Size f
Enhanced Stereo Cross Coupling
Frequency Response V
Loudness Volume Attenuator=40 dB, Loudness
Signal-to-Noise Ratio V
Channel Balance All Volume Settings 0.2 1.0 dB (max) Channel Separation Input Pins 4, 25: Output Pins 13, 16; 80 60 dB (min)
Input-Input Isolation 470to AC Ground on Unused Input 95 60 dB (min)
PSSR Power Supply Rejection Ratio V
f
V
V
V V
Clock Frequency 5.0 1.0 MHz
CLK
Logic “1” Input Voltage Pins 1, 27, 28 (IM Bus) 1.3 2.0 V (min)
IN(1)
Logic “0” Input Voltage Pins 1, 27, 28 (IM Bus) 0.4 0.8 V (max)
IN(0)
Logic “1” Output Voltage Pin 28 (IM Bus) 2.0 V (min)
OUT(1)
Logic “0” Output Voltage Pin 28 (IM Bus) 0.4 0.8 V (max)
OUT(0)
Note 1: AbsoluteMaximum Ratings indicate limits beyond which damage to the deivce may occur. Operating Ratings indicate conditions for which the device is func­tional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed speci­fications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
Note 2: All voltages are specified with respect to ground. Note 3: When the input voltage (V
limited to 5 mA or less. The 20 mA package input current limits the number of pins that can exceed the power supply voltages with 5 mA current limit to four.
) at any pin exceeds the power supply voltages (V
IN
=
9V, f
1 kHz, input signal (300 mV) applied to INPUT 1, volume=0 dB, bass
IN
=
=
T
+25˚C.
A
J
(Note 6) (Note 7) (Limit)
±
0.1
±
1.5 dB (min)
to 0100010XXX000000 (0 dB)
=
1.0 V
IN
IN
IN IN
rms
=
100 Hz, Pins 13, 16
=
100 Hz, Pins 13, 16
=
100 Hz, Pins 13, 16 2.0 1.5 dB (min)
105 86 dB (max)
±
12
±
0.1
±
10.0 dB (min)
±
14.0 dB (max)
±
1.5 dB (max)
(Relative to Previous Level) 2.5 dB (max)
=
10 kHz, Pins 13, 16
IN
=
10 kHz, Pins 13, 16
IN
=
10 kHz, Pins 13, 16 2.0 1.5 dB (min)
IN
±
12
±
0.1
±
10.0 dB (min)
±
14.0 dB (max)
±
1.5 dB (max)
(Relative to Previous Level) 2.5 dB (max) (Note 10) −4.4 −2.5 dB (min)
−6.9 dB (max)
Applied to Input 1 and Input 2;
IN
=
f
20 Hz − 20 kHz
IN
±
0.1
±
1.0 dB (max)
(Relative to Signal Amplitude at 1 kHz)
on (See
Figure 5
)
Gain at 100 Hz (Referenced 11.5 13.5 dB (max)
to Gain at 1 kHz) 9.5 dB (min)
Gain at 10 kHz (Referenced 6.5 8.5 dB (max)
to Gain at 1 kHz) 4.5 dB (min)
=
IN
Measured at 1 kHz, R
=
V
IN
+
=
, A Weighted, 95 90 dB (min)
1.0 V
1.0V
9V
rms
rms
; 200 mV
DC
(Note 8)
=
470
S
, 100 Hz 32 28 dB (min)
rms
Sinewave Applied to Pin 26
(max)
Pins 2, 3 2.9 5.5 V (min)
Pins 2, 3 1.2 3.5 V (max)
<
IN
V−or V
>
V+) the absolute value of the current at that pin should be
IN
=
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Electrical Characteristics (Continued)
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P +125˚C, and the typical junction-to-ambient thermal resistance, when board mounted, is 67˚C/W.
Note 5: Human body model; 100 pF discharged through a 1.5 kresistor. Note 6: Typicals are at T Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: The Input-Input Isolation is tested by driving one input and measuring the output when the undriven input are selected. Note 9: TheVolumeStepSize is defined as the change in attenuation between any two adjacent volume attenuation settings. The nominalVolumeStep Size is 2 dB. Note 10: Enhanced Stereo Cross Coupling is a measure of the ratio between the undriven right channel output signal and the driven left channel output signal. It
is measured by driving the left inputs with a 300 mV
=
(T
D
=
+25˚C and represent the most likely parametric norm.
J
)/θJAor the number given in the Absolute Maximum Ratings, whichever is lower. For the LMC1982CIN, T
JMAX−TA
signal while the right inputs are grounded.
rms
, θJA, and the ambient temperature TA. The maximum
JMAX
JMAX
Typical Performance Characteristics
=
Supply Current vs Supply Voltage
THD vs Load Impedance
THD vs V (V
OUT
IN
Constant)
DS011028-13
DS011028-16
Output Voltage vs Supply Voltage
CCIR Output Noise vs Volume Setting
THD vs Frequency
DS011028-14
DS011028-17
THD vs Load Impedance
DS011028-15
Channel Separation vs Frequency
DS011028-18
Mute Gain vs Frequency
DS011028-19
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DS011028-20
DS011028-21
Typical Performance Characteristics (Continued)
Tone Control Response with Equal Bass and Treble Control Settings
DS011028-22
Loudness Response vs Frequency
DS011028-23
Select Input Impedance vs Frequency
DS011028-24
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