Datasheet > AS2507T

AS2507T

更新时间： 2024-01-28 07:34:11

品牌	Logo	应用领域
艾迈斯 - AMSCO		/
页数	文件大小	规格书
9页	138K
描述
SINGLE CHIP 2-WIRE INTERCOM CMOS INTEGRATED CIRCUIT

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AS2507T 技术参数

生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP,	针数：	14
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.68	JESD-30 代码：	R-PDIP-T14
功能数量：	1	端子数量：	14
最高工作温度：	60 °C	最低工作温度：	-10 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装形状：	RECTANGULAR	封装形式：	IN-LINE
认证状态：	Not Qualified	标称供电电压：	5 V
表面贴装：	NO	技术：	CMOS
电信集成电路类型：	TELEPHONE MULTIFUNCTION CIRCUIT	温度等级：	COMMERCIAL
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

AS2507T 数据手册

Preliminary Data Sheet

AS2507

FSK Modulator

Functional Description

Two signalling modes are provided, namely

FSK and burst mode. The signalling mode and

The AS2507 is a CMOS integrated circuit that

incorporates a speech circuit and a FSK

modem. It is intended to be used as line-

powered interface on a 2-wire intercom bus.

the signalling can be controlled by

microcontroller using the TE and TXD inputs

as follows:

TXD MODE

Standby Condition

IDLE, no transmission

TEST, for testing only

SPACE ("0") 18.645 kHz

MARK ("1") 22.375 kHz

During standby operation (PD=High) only the

FSK demodulator is active to provide the

companion microcontroller with all signalling

information on the 2-wire bus. The low power

consumption (typical 2mA) and a high input

and output impedance in standby mode allow

the parallel operation of many terminals on

each bus pair.

FSK Demodulator

Also the demodulator provides two modes for

detection as follows:

Signal on line

RXD

2/4-Wire Conversion

IDLE, no transmission

SPACE ("0") 18.645 kHz

MARK ("1") 22.375 kHz

The AS2507 has

built-in side tone

cancellation circuit. The transmit signal is

attenuated by 6 dB over the 600Ω resistor (ac

impedance) and subtracted from the receive

signal at the receive input (RI). This

configuration allows the selection of the

required ac impedance and yet maintaining a

good side tone cancellation.

The demodulator consists out of a bandpass

filter to attenuate interfering speech signals

and a period counter. The RxD output is

updated after each valid period or a counter

overflow.

AC Impedance

Transmission Protocol

The ac impedance is determined by an

external resistor at the TO output (typical

600Ω).

In order to assure a safe data transmission,

data framing is recommended. Each frame

should consist out of a preamble (e.g. FFhex),

header (e.g. AAhex), data bytes and

Transmit Path

checksum.

The gain of the transmit path from the

microphone inputs (M1/M2) to the transmit

output (TO) is set to 32 dB. The soft clip level

PEAK

Independence of bus polarity

is set to 0.5V

at TO. In standby the output

Centrally supplied terminals can be connected

to the 2-wire bus independent from polarity. In

this case a rectifier bridge, known from

telephony, is recommended since the DC-

supply current will bias the diodes.

impedance is 60kΩ.

Receive Path

The gain of the receive path from the receive

input (RI) to the receive output (RO) is set to

-6dB. The receive input is internally biased to

GND

with a 500kΩ resistor.

3/9

July 1998

1 234 5 6 7...9

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