Datasheet > TC9401EJD

TC9401EJD

更新时间： 2024-02-22 18:43:30

品牌	Logo	应用领域
TELCOM		转换器
页数	文件大小	规格书
13页	155K
描述
VOLTAGE-TO-FREQUENCY/FREQUENCY-TO-VOLTAGE CONVERTERS

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技术参数
数据手册

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TC9401EJD 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.78
Is Samacsys：	N	转换器类型：	VOLTAGE TO FREQUENCY CONVERTER
JESD-30 代码：	R-GDIP-T14	端子数量：	14
封装主体材料：	CERAMIC, GLASS-SEALED	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
表面贴装：	NO	端子形式：	THROUGH-HOLE
端子位置：	DUAL	Base Number Matches：	1

TC9401EJD 数据手册

VOLTAGE-TO-FREQUENCY/

FREQUENCY-TO-VOLTAGECONVERTERS

TC9400

TC9401

TC9402

+5V

10kΩ

THRESHOLD

DETECT

OUT 8

3µsec

DELAY

THRESHOLD

DETECTOR

10kΩ

OUT

SELF-

START

÷2

OUTPUT

COMMON

–3V

12 AMP OUT

OUT

REF

20kΩ

INT

REF

820pF

12pF

180pF

TC9400

TC9401

TC9402

1MΩ

INPUT

60pF

–

+5V

OpAmp

ZERO

ADJUST

0V –10V

50kΩ

510kΩ

GND

REF

BIAS

–5V

OFFSET

ADJUST

10kΩ

BIAS

100kΩ

REFERENCE

VOLTAGE

(TYPICALLY –5V)

–5V

Figure 1. 10 Hz to 10 kHz V/F Converter

VOLTAGE-TO-FREQUENCY (V/F)

CIRCUIT DESCRIPTION

At the end of the charging period, C_REFis shorted out.

This dissipates the charge stored on the reference capaci-

tor, so that when the output again crosses zero the system

is ready to recycle. In this manner, the continued discharg-

ing of the integrating capacitor by the input is balanced out

by fixed charges from the reference voltage. As the input

voltage is increased, the number of reference pulses re-

quired to maintain balance increases, which causes the

output frequency to also increase. Since each charge in-

crement is fixed, the increase in frequency with voltage is

linear. In addition, the accuracy of the output pulse width

does not directly affect the linearity of the V/F. The pulse

must simply be long enough for full charge transfer to take

place.

The TC9400 V/F converter operates on the principal

of charge balancing. The operation of the TC9400 is easily

understood by referring to Figure 1. The input voltage (V_IN)

is converted to a current (I_IN) by the input resistor. This

current is then converted to a charge on the integrating

capacitor and shows up as a linearly decreasing voltage at

the output of the op amp. The lower limit of the output

swing is set by the threshold detector, which causes the

reference voltage to be applied to the reference capacitor

for a time period long enough to charge the capacitor to

the reference voltage. This action reduces the charge on

the integrating capacitor by a fixed amount (q = C_REF

V_REF), causing the op amp output to step up a finite

amount.

TELCOM SEMICONDUCTOR, INC.

3-291

1 2 3 456 7 8...13

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