AD693

更新时间： 2024-01-15 10:16:24

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	499K
描述
Loop-Powered 4.20 mA Sensor Transmitter

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技术参数
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AD693 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
Reach Compliance Code：	not_compliant	HTS代码：	8542.39.00.01
风险等级：	5.61	Is Samacsys：	N
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	R-GDIP-T20
JESD-609代码：	e0	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	CERAMIC, GLASS-SEALED
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 SPECIFIED
认证状态：	Not Qualified	座面最大高度：	5.08 mm
表面贴装：	NO	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	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 SPECIFIED	宽度：	7.62 mm
Base Number Matches：	1

AD693 数据手册

AD693

Figure 15. Local Powered Operation with 0–20 mA Output

OPTIONAL INPUT FILTERING

INTERFACING PLATINUM RTDS

Input filtering is recommended for all applications of the

AD693 due to its low input signal range. An RC filter network

at each input of the signal amplifier is sufficient, as shown in

Figure 16. In the case of a resistive signal source it may be

necessary only to add the capacitors, as shown in Figure 18.

The capacitors should be placed as close to the AD693 as

possible. The value of the filter resistors should be kept low to

minimize errors due to input bias current. Choose the 3 dB

point of the filter high enough so as not to compromise the

bandwidth of the desired signal. The RC time constant of the

filter should be matched to preserve the ac common-mode

rejection.

The AD693 has been specially configured to accept inputs from

100 Ω Platinum RTDs (Resistance Temperature Detectors).

Referring to Figure 17, the RTD and the temperature stable

100 Ω resistor form a feedback network around the Auxiliary

Amplifier resulting in a noninverting gain of (1 + R_T/100 Ω),

where R_Tis the temperature dependent resistance of the RTD.

The noninverting input of the Auxiliary Amplifier (Pin 2) is

then driven by the 75 mV signal from the Voltage Divider (Pin

4). When the RTD is at 0, its 100 Ω resistance results in an

amplifier gain of +2 causing V_Xto be 150 mV. The Signal

Amplifier compares this voltage to the 150 mV output (Pin 3) so

that zero differential signal results. As the temperature (and

therefore, the resistance) of the RTD increases, V_Xwill likewise

increase according to the gain relationship. The difference

between this voltage and the zero degree value of 150 mV drives

the Signal Amp to modulate the loop current. The AD693 is

precalibrated such that the full 4-20mA output span corresponds

to a 0 to 104°C range in the RTD. (This assumes the European

Standard of α = 0.00385.) A total of 6 precalibrated ranges for

three-wire (or two-wire) RTDs are available using only the pin

strapping options as shown in Table I.

A variety of other temperature ranges can be realized by using

different application voltages. For example, loading the Voltage

Divider with a 1.5 kΩ resistor from Pin 3 to Pin 6 (common)

will approximately halve the original application voltages and

allow for a doubling of the range of resistance (and therefore,

temperature) required to fill the two standard spans. Likewise,

Figure 16. Optional Input Filtering

Table I. Precalibrated Temperature

Range Options Using a European

Standard 100

Ω

RTD and the AD693

Temperature

Range

Pin Connections

0 to + 104°C

0 to +211°C

12 to 13

12 to 13, and

15 to 16

+25°C to +130°C 12 to 14

+51°C to +266°C 12 to 14, and

15 to 16

–50°C to +51°C

12 to 11

–100°C to +104°C 12 to 11 and

15 to 16

Figure 17. 0-to-104°C Direct Three-Wire 100 Ω RTD lnterface, 4-20mA Output

REV. A

–9–

1...6 7 8910 11 12

中文翻译

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AD693AD	ADI	Loop-Powered 4.20 mA Sensor Transmitter	获取价格
AD693AE	ADI	Loop-Powered 4.20 mA Sensor Transmitter	获取价格
AD693AQ	ADI	Loop-Powered 4.20 mA Sensor Transmitter	获取价格
AD693BQ	ADI	Loop-Powered 4â20 mA Sensor Transmitter	获取价格
AD694	ADI	4.20 mA Transmitter	获取价格

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