AD694AQ

更新时间： 2024-02-09 20:11:58

品牌	Logo	应用领域
亚德诺 - ADI		模拟IC 信号电路
页数	文件大小	规格书
12页	428K
描述
4.20 mA Transmitter

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技术参数
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AD694AQ 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	0.64
Samacsys Confidence：	3	Samacsys Status：	Released
Samacsys PartID：	169175	Samacsys Pin Count：	16
Samacsys Part Category：	Integrated Circuit	Samacsys Package Category：	Dual-In-Line Packages
Samacsys Footprint Name：	N-16	Samacsys Released Date：	2015-06-25 00:00:00
Is Samacsys：	N	模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PDIP-T16	JESD-609代码：	e3
长度：	20.13 mm	功能数量：	1
端子数量：	16	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT APPLICABLE
认证状态：	Not Qualified	座面最大高度：	5.33 mm
最大供电电压 (Vsup)：	36 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	24 V	表面贴装：	NO
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	THROUGH-HOLE	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 APPLICABLE
宽度：	7.62 mm	Base Number Matches：	1

AD694AQ 数据手册

AD694

Figure 4. Using Optional Pass Transistor to Minimize Self-Heating Errors; Dual Supply Operation Shown

POWER DISSIPATION CONSIDERATIONS

P(_TOT) = 2 mA × 24 V + (24 V – 10 V) × 1 mA + (24 V – 0 V) × 20 mA

The AD694 is rated for operation over its specified temperature

without the use of an external pass transistor. However, it is

possible to exceed the absolute maximum power dissipation,

with some combinations of power supply voltage and voltage

reference load. The internal dissipation of the part can be calcu-

lated to determine if there is a chance that the absolute maxi-

mum dissipation may be exceeded. The die temperature must

never exceed 150°C.

= 48 mW + 14 mW + 480 mW = 542 mW

Using θ_JCof 30°C/Watt and θ_CAof 70°C/Watt, (from spec page)

the junction temperature is:

T_J= 542 mW (30°C/W + 70°C/W) + 50°C = 104.2°C

The junction temperature is in the safe region.

Internal power dissipation can be reduced either by reducing the

value of θ_CAthrough the use of air flow or heat sinks, or by re-

ducing P(_TOT) of the AD694 through the use of an external pass

transistor. Figure 5 shows the maximum case and still air tem-

peratures for a given level of power dissipation.

Total power dissipation (P_TOT), is the sum of power dissipated

by the internal amplifiers, P (Standing), the voltage reference,

P(V_REF) and the current output stage, P(I_OUT) as follows:

P_TOT= P (Standing) + P (V_REF) + P (I_OUT

)

where:

P (Standing) = 2 mA (max) × V_S

P (V_REF) = (V_S– V_REF) × I_VREF

P(I_OUT) (V_S– V_OUT) × I_OUT(max):

_OUT(max) may be the max expected operating cur-

rent, or the overdriven current of the device.

P(I_OUT) drops to (2 Volts × I_OUT) if a pass transistor

is used.

Definitions:

_REF= output voltage of reference

_VREF= output current of reference

V_S= supply voltage

_OUT= voltage at I_OUTpin.

An appropriate safety factor should be added to P_TOT

Figure 5. Internal Power Dissipation in mW

The junction temperature may be calculated with the following

formula:

ADJUSTMENT PROCEDURES

The following sections describe methods for trimming the out-

put current offset, the span and the voltage reference.

T_J= P_TOT(θ_JC+ θ_CA) + T_AMBIENT

θ_JCis the thermal resistance between the chip and the package

(case), θ_CAis the thermal resistance between the case and its

surroundings and is determined by the characteristics of the

thermal connection of the case to ambient.

ADJUSTING 4 mA ZERO

The 4 mA zero current may be adjusted over the range of 2 mA

to 4.8 mA to accommodate large input signal offsets, or to allow

small adjustment in the zero current. The zero may be adjusted

by pulling up or down on Pin 6 (4 mA Adj) to increase or de-

crease the nominal offset current. The 4 mA Adj. (Pin 6) should

not be driven to a voltage greater than 1 V. The arrangement of

For example, assume that the part is operating with a V_Sof 24 V

in the cerdip package at 50°C, with a 1 mA load on the 10 V

reference. Assume that I_OUTis grounded and that the max I_OUT

would be 20 mA. The internal dissipation would be:

REV. A

–7–

1...4 5 678 9 10...12

中文翻译

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AD694AQ 替代型号

型号	品牌	替代类型	描述	数据表
AD694BQ	ADI	完全替代	4.20 mA Transmitter
AD694JNZ	ADI	类似代替	4â20 mA Transmitter
AD694JN	ADI	类似代替	4.20 mA Transmitter

与AD694AQ相关器件

型号	品牌	获取价格	描述	数据表
AD694AR	ADI	获取价格	4.20 mA Transmitter
AD694ARZ	ADI	获取价格	4â20 mA Transmitter
AD694ARZ-REEL	ADI	获取价格	IC TRANSMITTER 4-20MA 16-SOIC
AD694BQ	ADI	获取价格	4.20 mA Transmitter
AD694BR	ADI	获取价格	4.20 mA Transmitter
AD694BRZ	ADI	获取价格	4â20 mA Transmitter
AD694BRZ-REEL	ADI	获取价格	4â20 mA Transmitter
AD694BRZ-REEL7	ADI	获取价格	IC IC,TRANSDUCER SIGNAL CONDITIONER,BIPOLAR,SOP,16PIN,PLASTIC, Analog IC:Other
AD694JCHIPS	ADI	获取价格	IC SPECIALTY ANALOG CIRCUIT, UUC, DIE, Analog IC:Other
AD694JN	ADI	获取价格	4.20 mA Transmitter

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