LMC1983 National Semiconductor, LMC1983 Datasheet
LMC1983
Available stocks
Related parts for LMC1983
LMC1983 Summary of contents
Page 1
... There are two digital inputs for easy in- terface to other audio peripherals such as stereo decoders. The LMC1983 is designed for line level input signals (300 mV–2V) and has a maximum gain of −0.5 dB. Volume is set at minimum and tone controls are flat when supply volt- age is first applied ...
Page 2
... Seconds) V Package, (Vapor Phase, 60 Seconds) Infrared, (15 Seconds) 15V ESD Susceptability (Note 0.2V Operating Ratings 5 mA Temperature Range 20 mA LMC1983CIN, LMC1983CIV 500 mW Supply Voltage Range (V +125˚C −65˚C to +150˚ kHz, input signal (300 mV) applied to INPUT 1, volume = 0 dB, bass = IN Conditions = 0 rms ...
Page 3
... AC Ground on Unused Input = 200 mV , 100 Hz DC rms < − > JMAX or the number given in the Absolute Maximum Ratings, whichever is lower. For the LMC1983CIN +25˚ Typical Limit Unit (Note 6) (Note 7) (Limit) ± ± 0.1 1.5 dB (min) ± ...
Page 4
Electrical Characteristics Note 5: Human body model; 100 pF discharged through a 1 +25˚C and represent the most likely parametric norm. Note 6: Typicals are Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing ...
Page 5
... Equal Bass and Treble Control Settings DS011279-20 Connection Diagram Top View Order Number LMC1983CIN See NS Package Number N28B (Continued) Loudness Response vs Frequency DS011279-21 DS011279-2 Order Number LMC1983CIV See NS Package Number V28A 5 Select Input Impedance vs Frequency DS011279-22 DS011279-10 Top View www.national.com ...
Page 6
... The LMC1983 is a CMOS/bipolar building block intended for high fidelity audio signal processing designed for line level inputs signals (300 mV − 2V) and has a maximum gain of −0.5 dB. While the LMC1983 is manufactured with CMOS processing, NPN transistors are used to build low noise op amps. The combination of CMOS switches, bipolar op amps, ...
Page 7
... Application Information INPUT SELECTOR The LMC1983’s input selector and mode control are shown in Figure 2 . The input selector selects one of three stereo signal sources or a mute function with typical attenuation of 100 dB. The selected signals are then sent to a mode control matrix ...
Page 8
Application Information at lower output levels. If the load impedance is DC-coupled, an increased quiescent current can flow. Latch-up may occur if the total emitter current exceeds 5 mA. Thus, maximum output voltage can be increased and much lower distortion ...
Page 9
... Application Information (Continued) TABLE 1. IM Bus Programming Codes for LMC1983 Address Function (A7–A0) 01000000 Input Select + Mute 01000001 Loudness 01000010 Bass 01000011 Treble 01000100 Left Volume 01000101 Right Volume 01000110 Mode Select 01000111 Read Digital Input 1 or Digital Input Bus ...
Page 10
... Hz and 20 kHz, and + kHz. The frequency where a tone control begins to deviate from a flat response is referred to as the turn-over frequency. With C3, the LMC1983’s treble turn-over frequency is nominally The bass turn-over frequency is nominally when maximum boost is chosen. The inflection points (the ...
Page 11
... LMC1983’s desired functions. Each address bit is clocked in on the rising edge of CLK. The ID line is taken high after the eight bits of address data are received by the LMC1983. Table 1 also details the serial data structure, range, and bit assignments that sets each function’s operating point. The volume and tone controls’ ...
Page 12
... IM Bus is given in the appendix of ITT’s CCU2000 datasheet. www.national.com DIGITAL I/O (Continued) The LMC1983’s two Digital Input pins, 2 and 3, provide single-bit communication between a peripheral device and the controller over the IM Bus. Each pin has an internal 30 k pull-up resistor. Therefore, these pins should be con- nected to open collector/drain outputs ...
Page 13
... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LMC1983CIN NS Package Number N28B Order Number LMC1983CIV NS Package Number V28A 13 www.national.com ...
Page 14
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...