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LMC1992CCN

更新时间： 2024-01-23 11:25:24

品牌	Logo	应用领域
美国国家半导体 - NSC		音频控制集成电路消费电路商用集成电路光电二极管信息通信管理
页数	文件大小	规格书
14页	261K
描述
LMC1992 Digitally-Controlled Stereo Tone and Volume Circuit with Four-Channel Input-Selector

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技术参数
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LMC1992CCN 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP28,.6	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDIP-T28
JESD-609代码：	e0	端子数量：	28
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP28,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	8 V
认证状态：	Not Qualified	子类别：	Audio Control ICs
表面贴装：	NO	技术：	BICMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

LMC1992CCN 数据手册

Pin Description

DATA(1)

This is the serial data input for communica-

REAR OUT

(13, 17)

This pin’s output signal is intended for the

rear amplifiers in a four speaker stereo sys-

tem. The output can typically sink 350 mA.

tions sent by a controller. The data rate has a

maximum frequency of 500 kHz. The

LMC1992 requires 11 bits of data to control

or change a function: the first two bits, a 1

and 0, select the LMC1992, the next three

bits select a function, and the final six bits set

the function to a desired value. The data

must be valid on the rising edge of the

CLOCK input signal.

FRONT OUT This pin’s output signal is intended for the

front amplifiers in a four speaker stereo sys-

(14, 16)

tem. The output can typically sink 350 mA.

GROUND

(15)

V^a(28)

This is the system ground connection.

This is the power supply connection. The

LMC1992 is operational with supply voltages

from 6V to 12V. It is recommended that this

pin is bypassed with 0.1 mF capacitor.

CLOCK(2)

The CLOCK input accepts a TTL or CMOS

level clocking signal. The input is used to

clock the DATA input signal and determines

when a data bit is valid.

BYPASS (27) A 10 mF capacitor is connected between this

pin and ground.

ENABLE(3) This input accepts a logic low signal when a

controller is addressing the LMC1992. When

ENABLE is active, the LMC1992 responds to

input signals present on the DATA and

CLOCK inputs.

General Information

The LMC1992 is a CMOS/bipolar high quality building block

intended for high fidelity audio signal processing. It is de-

signed for line level input signals (300 mV

2V) and has a

INPUT 1–4 Four two-channel analog inputs are available

(4–7, 23–26) on the LMC1992. These pins should be dc-bi-

ased to mid-supply.

maximum gain of 1 dB. While the LMC1992 is manufac-

tured with CMOS processing, NPN transistors are used to

build low noise op amps. The combination of CMOS

switches, bipolar op amps, and SiCr resistors make it possi-

ble to achieve an order of magnitude quality improvement

over other bipolar circuits that use analog multipliers to ac-

complish gain adjustment.

SELECT OUT The selected INPUT signal is available at this

(8, 22)

output. This feature allows the use of external

signal processing such as noise reduction or

graphic equalizers. This output can typically

sink 1 mA.

The LMC1992 has internal decoding logic that allows a

computer (mP) to communicate directly to the audio control

circuitry through a standard MICROWIRE interface. This

three-wire interface consists of a DATA input line, a CLOCK

input line, and an ENABLE line. When the ENABLE line is

low, data can be serially shifted from the controller to the

LMC1992. As the ENABLE line goes through the low-to-

high transition, any additional data is ignored. Data present

in the internal shift register is latched and the instruction is

executed.

SELECT IN This is the input that an external signal proc-

essor uses to return a signal to the LMC1992.

(9, 21)

TONE IN

(10, 20)

This is the input to the tone control amplifier.

See the Application Information section titled

‘‘Tone Control Response’’.

TONE OUT Tone control amplifier output. See the Appli-

cation Information section titled ‘‘Tone Con-

trol Response’’.

(11, 19)

OP AMP OUT This output is used externally with the tone

control capacitors. Internally, this output is

applied to the volume attenuators.

(12, 18)

Figure 1 shows the connection diagram of a typical

LMC1992 application.

TL/H/10789–18

FIGURE 1. Typical Connection Diagram

1...3 4 567 8 9...14

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