73K224L-IH

更新时间： 2024-02-26 15:04:53

品牌	Logo	应用领域
东电化 - TDK		调制解调器电信集成电路
页数	文件大小	规格书
32页	208K
描述
V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem

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技术参数
数据手册

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73K224L-IH 技术参数

生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP,	针数：	22
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.04	其他特性：	FULL DUPLEX
数据速率：	2.4 Mbps	JESD-30 代码：	R-PDIP-T22
长度：	27.686 mm	功能数量：	1
端子数量：	22	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	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
座面最大高度：	5.08 mm	标称供电电压：	5 V
表面贴装：	NO	电信集成电路类型：	MODEM
温度等级：	INDUSTRIAL	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
宽度：	10.16 mm	Base Number Matches：	1

73K224L-IH 数据手册

73K224L

V.22bis/V.22/V.21/Bell 212A/Bell 103

Single-Chip Modem

CRYSTAL OSCILLATOR

MODEM PERFORMANCE CHARACTERISTICS

The K-Series crystal oscillator requires a parallel mode

(antiresonant) crystal which operates at 11.0592 MHz.

It is important that this frequency be maintained to

within ±0.01% accuracy.

The curves presented here define modem IC

performance under a variety of line conditions

while inducing disturbances that are typical of

those encountered during data transmission on

public service telephone lines. Test data was

taken using an AEA Electronics’ “Autotest I”

modem test set and line simulator, operating

under computer control. All tests were run full-

duplex, using a Hayes SmartModemÔ 2400 as

the reference modem. A 511 pseudo-random-bit

pattern was used for each data point. Noise was

C-message weighted and all signal-to-noise (S/N)

ratios reflect total power measurements similar to

the CCITT V.56 measurement specification. The

individual tests are defined as follows.

In order for a parallel mode crystal to operate correctly

and to specification, it must have a load capacitor

connected to the junction of each of the crystal and

internal inverter connections, terminated to ground.

The values of these capacitors depend primarily on the

crystal’s characteristics, and to a lesser degree on the

internal inverter circuit. The values used affect the

accuracy and start up characteristics of the oscillator.

LAYOUT CONSIDERATIONS

Good analog/digital design rules must be used to

control system noise in order to obtain highest

performance in modem designs. The more digital

circuitry present on the PC board, the more this

attention to noise control is needed. The modem

should be treated as a high impedance analog device.

A 22 µF electrolytic capacitor in parallel with a 0.22 µF

ceramic capacitor between VDD and GND is

recommended. Liberal use of ground planes and

larger traces on power and ground are also highly

favored. The ISET resistor and capacitor should be

mounted near the ISET pin, away from digital signals.

High speed digital circuits tend to generate

BER vs. S/N

This test measures the ability of the modem to

operate over noisy lines with a minimum of data-

transfer errors. Since some noise is generated in

the best of dial-up lines, the modem must operate

with the lowest S/N ratio possible. Better modem

performance is indicated by test curves that are

closest to the BER axis. A narrow spread between

curves representing the four line parameters

indicates minimal variation in performance while

operating over a range of aberrant operating

conditions. Typically, a modem will exhibit better

BER-performance test curves receiving in the low

band than in the high band.

significant

amount

EMI

(Electro-Magnetic

Interference) which must be minimized in order to

meet regulatory agency limitations. To accomplish this,

high speed digital devices should be locally bypassed,

and the telephone line interface and K-Series device

should be located close to each other near the area of

the board where the phone line connection is

accessed. To avoid problems, power supply and

ground traces should be routed separately to the

analog and digital functions on the board, and digital

signals should not be routed near low level or high

impedance analog traces. The analog and digital

grounds should only connect at one point near the K-

Series device ground pin to avoid ground loops. The

K-Series modem IC’s should have both high frequency

and low frequency bypassing as close to the package

as possible.

BER vs. Receive Level

This test measures the dynamic range of the

modem. Because signal levels vary widely over

dial-up lines, the widest possible dynamic range is

desirable. The minimum Bell specification calls for

36 dB of dynamic range. S/N ratios are held

constant at the indicated values while the receive

level is lowered from a very high to very low signal

levels. The width of the “bowl” of these curves,

taken at the BER point, is the measure of dynamic

range.

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与73K224L-IH相关器件

型号	品牌	获取价格	描述	数据表
73K224L-IP	TDK	获取价格	V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem
73K224L-IP	SST	获取价格	Modem, 2.4kbps Data, PDIP28
73K224LS-IP	SST	获取价格	2.4kbps DATA, MODEM, PDIP22, 0.400 INCH, PLASTIC, DIP-22
73K22IAL-IH	TDK	获取价格	Modem, 1.2kbps Data, CMOS, PQCC28, PLASTIC, LCC-28
73K22IAL-IP	TDK	获取价格	Modem, 1.2kbps Data, CMOS, PDIP28, 0.600 INCH, PLASTIC, DIP-28
73K302L	TDK	获取价格	Single-Chip Modem
73K302L-IH	TDK	获取价格	Single-Chip Modem
73K302L-IP	TDK	获取价格	Single-Chip Modem
73K321L	TDK	获取价格	CCITT V.23, V.21 Single-Chip Modem
73K321L-IH	TDK	获取价格	CCITT V.23, V.21 Single-Chip Modem

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