AD7417BR-REEL7

更新时间： 2024-01-16 16:08:38

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器传感器温度传感器光电二极管
页数	文件大小	规格书
20页	291K
描述
10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)

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中文翻译

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技术参数
数据手册
替代型号

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AD7417BR-REEL7 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP,	针数：	16
Reach Compliance Code：	unknown	风险等级：	5.66
最大模拟输入电压：	2.625 V	最小模拟输入电压：
最长转换时间：	15 µs	转换器类型：	ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e0
长度：	9.9 mm	最大线性误差 (EL)：	0.0977%
湿度敏感等级：	1	模拟输入通道数量：	4
位数：	10	功能数量：	1
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-40 °C	输出位码：	2'S COMPLEMENT BINARY
输出格式：	SERIAL	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	240
采样并保持/跟踪并保持：	TRACK	座面最大高度：	1.75 mm
标称供电电压：	3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	TIN LEAD
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm	Base Number Matches：	1

AD7417BR-REEL7 数据手册

AD7416/AD7417/AD7418

start of the conversion phase and is powered down at the end of

the conversion. The on-chip reference is selected by connecting

the REF_INpin to analog ground. This causes SW1 (see Figure 4)

to open and the reference amplifier to power up during a conver-

sion. Therefore, the on-chip reference is not available externally.

An external 2.5 V reference can be connected to the REF_INpin.

This has the effect of shutting down the on-chip reference circuitry.

TYPICAL CONNECTION DIAGRAM

Figure 2 shows a typical connection diagram for the AD7417.

Using the A0, A1, and A2 pins allows the user to select from up

to eight AD7417s on the same serial bus, if desired. An external

2.5 V reference can be connected at the REF_INpin. If an exter-

nal reference is used, a 10 µF capacitor should be connected

between REF_INand GND. SDA and SCL form the 2-wire I²C

compatible interface. For applications where power consump-

tion is of concern, the automatic power-down at the end of a

conversion should be used to improve power performance. See

Operating Modes section of this data sheet.

REF

EXTERNAL

REFERENCE

DETECT

1.2V

SUPPLY

2.7V TO

5.5V

SW1

2-WIRE

SERIAL

INTERFACE

10␮F

0.1␮F

1.2V

26k⍀

24k⍀

BUFFER

2.5V

SCL

SDA

IN1

0V TO 2.5V

INPUT

IN2

CONVST

IN3

OTI

␮C/␮P

IN4

AD7417

Figure 4. On-Chip Reference

GND

TEMPERATURE MEASUREMENT

REF

A common method of measuring temperature is to exploit the

negative temperature coefficient of a diode, or the base-emitter

voltage of a transistor, operated at a constant current. Unfortu-

nately, this technique requires calibration to null out the effect

of the absolute value of V_BE, which varies from device to device.

OPTIONAL

AD780/

REF-192

EXTERNAL

10␮F FOR

EXTERNAL

REFERENCE

Figure 2. Typical Connection Diagram

ANALOG INPUTS

The technique used in the AD7416/AD7417/AD7418 is to

measure the current change in V_BEwhen the device is operated

at two different currents.

Figure 3 shows an equivalent circuit of the analog input struc-

ture of the AD7417 and AD7418. The two diodes, D1 and D2,

provide ESD protection for the analog inputs. Care must be

taken to ensure that the analog input signal never exceeds the

supply rails by more than 200 mV. This will cause these diodes

to become forward-biased and start conducting current into the

substrate. The maximum current these diodes can conduct

without causing irreversible damage to the part is 20 mA. The

capacitor C2 in Figure 3 is typically about 4 pF and can prima-

rily be attributed to pin capacitance. The resistor R1 is a lumped

component made up of the on resistance of a multiplexer and a

switch. This resistor is typically about 1 kΩ. The capacitor C1 is

the ADC sampling capacitor and has a capacitance of 3 pF.

This is given by

∆V_BE= KT / q ×1n N

(

)

where:

K is Boltzmann’s constant.

q is the charge on the electron (1.6 × 10^-19Coulombs).

T is the absolute temperature in Kelvins.

N is the ratio of the two currents.

3pF

1k⍀

OUT؉

BALANCE

TO ADC

SENSING

TRANSISTOR

4pF

CONVERT PHASE – SWITCH OPEN

TRACK PHASE – SWITCH CLOSED

OUT؊

SENSING

TRANSISTOR

Figure 3. Equivalent Analog Input Circuit

ON-CHIP REFERENCE

Figure 5. Temperature Measurement Technique

The AD7416/AD7417/AD7418 has an on-chip 1.2 V band gap

reference that is gained up by a switched capacitor amplifier to

give an output of 2.5 V. The amplifier is only powered up at the

REV. G

–9–

1...6 7 8910 11 12...20

中文翻译

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AD7417BR-REEL7 替代型号

型号	品牌	替代类型	描述	数据表
AD7417BRZ	ADI	类似代替	10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
AD7417BR	ADI	类似代替	10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)

与AD7417BR-REEL7相关器件

型号	品牌	获取价格	描述	数据表
AD7417BRZ	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
AD7417BRZ-REEL	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
AD7417BRZ-REEL7	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
AD7417R	ADI	获取价格	Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 3Cel, RECT
AD7417RU	ADI	获取价格	Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 3Cel, RECT
AD7417-WAFER	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
AD7418	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
AD7418_15	ADI	获取价格	10-Bit Digital Temperature Sensor
AD7418ACHIPS	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
AD7418AR	ADI	获取价格	10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)

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