3652

更新时间： 2024-02-06 07:05:39

品牌	Logo	应用领域
德州仪器 - TI		隔离放大器分离技术隔离技术
页数	文件大小	规格书
14页	149K
描述
Optically-Coupled Linear ISOLATION AMPLIFIERS

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3652 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	MODULE	包装说明：	DIP-32
针数：	32	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.69	Is Samacsys：	N
放大器类型：	ISOLATION AMPLIFIER	最大共模电压：	2000 V
最小绝缘电压：	2000 V	JESD-30 代码：	R-MDMA-P32
标称负供电电压 (Vsup)：	-15 V	功能数量：	1
端子数量：	32	最高工作温度：	85 °C
最低工作温度：		封装主体材料：	METAL
封装代码：	DIP	封装等效代码：	DIP32,.9
封装形状：	RECTANGULAR	封装形式：	MICROELECTRONIC ASSEMBLY
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	+-8/+-18 V
认证状态：	Not Qualified	子类别：	Isolation Amplifier
标称供电电压 (Vsup)：	15 V	表面贴装：	NO
温度等级：	OTHER	端子形式：	PIN/PEG
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

3652 数据手册

Model 722 DC/DC

converter or equivalent

I₁

P+

722

V+

V–

+V_O

–V_O

(!)

1.3kΩ

R_IN

–V

+15VDC

I₂

V_OUT

–

–15VDC

+V_CC

–V_CC

R_IN

Output

–

32 Bal

10kΩ⁽¹⁾

Output

Common

Bal

V_ISO

50kΩ⁽¹⁾

NOTE: (1) Optional Offset Adjust.

_OUT= (I₁– I₂) X 10⁶V/A + V_ISOX IMRR⁽²⁾

3MΩ⁽¹⁾

NOTE: (1) The offset adjustment circutry and power supply connections

have been omitted for simplicity. Refer to Figure 5 for details. (2) IMRR

here is in pA/V, typically 5pA/V at 60Hz and 1pA/V at DC.

FIGURE 5. Power and Offset Adjust Connections.

FIGURE 6a. 3650 with Differential Current Sources.

INPUT CONFIGURATIONS

Some possible input configurations for the 3650 and 3652

are shown in Figures 6a, 6b, 6c. Differential input sources

are used in these examples. For situations with nondifferential

inputs, the appropriate source term should be set to zero in

the gain equations and replaced with a short in the diagrams.

V₁

R_G1

(1)

Figure 6a shows the 3650 connected as a transconductance

amplifier with input current sources. Voltage sources are

shown in Figure 6b. In this case the voltages are converted

to currents by R_G1and R_G2. As shown by the equations, they

perform as gain setting resistors in the voltage transfer

function. When a single voltage source is used, it is recom-

mended (but not essential) that the gain setting resistor

remain split into two equal halves in order to minimize

errors due to bias currents and common-mode rejection (see

Typical Performance Curves).

R_IN

V₂

R_G2

V_OUT

–

V_ISO

Figure 6c illustrates the connections for the 3652 when the

FET buffer amplifiers, A₁and A₂, are used. This configura-

tion provides an isolation amplifier with high input imped-

ance (both common-mode and differential, and good com-

mon-mode and isolation-mode rejection. It is a true isolated

instrumentation amplifier which has many benefits for noise

rejection when source impedance imbalances are present.

V_ISO

10⁶Ω

R_G1+ R_G2+ R_IN+ R_O

V_OUT= (V₁– V₂) +

IMRR

NOTE: (1) The offset adjustment circutry and power supply connections

have been omitted for simplicity. Refer to Figure 5 for details.

FIGURE 6b. 3650 with Differential Voltage Sources.

In the 3652, the voltage gain of the buffer amplifiers is

slightly less than unity, but the gain of the output stage has

been raised to compensate for this so that the overall transfer

function from the ±I or ±I_Rinputs to the output is correct. It

should be noted that A₁and A₂are buffer amplifiers. No

summing can be done at the ±I or ±I_Rinputs. Figure 6c

shows the +I and –I inputs used. If more input voltage

protection is desired, then the +I_Rand –I_Rinputs should be

used. This will increase the input noise due to the contribu-

tion from the 1.6MΩ resistors, but will provide additional

differential and common-mode protection (10ms rating of

3kV).

ERROR ANALYSIS

A model of the 3650 suitable for DC error analysis of offset

voltage, voltage drift versus temperature, bias current, etc.,

is shown in Figure 7.

A₁and A₂, the input and output stage amplifiers, are consid-

ered to be ideal. Separate external generators are used to

model the offset voltages and bias currents. R_INis assumed

to be small relative to R_G1and R_G2and is therefore omitted

from the gain equation. The feedback configuration, optics

and component matching are such that I₁= I₂= I₃= I₄. A

simple circuit analysis gives the following expression for the

3650/52

1...5 6 789 10 11...14

中文翻译

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