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EVAL-AD7416/7/8EBZ PDF预览

EVAL-AD7416/7/8EBZ

更新时间: 2024-12-01 12:27:15
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
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24页 396K
描述
10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs

EVAL-AD7416/7/8EBZ 数据手册

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10-Bit Digital Temperature Sensor  
(AD7416) and Four Single-Channel ADCs  
AD7416/AD7417/AD7418  
FUNCTIONAL BLOCK DIAGRAMS  
FEATURES  
10-bit ADC with 15 μs and 30 μs conversion times  
Single and 4 single-ended analog input channels  
On-chip temperature sensor: −40°C to +125°C  
On-chip track-and-hold  
10-BIT  
BAND GAP  
TEMPERATURE  
SENSOR  
ANALOG-TO-DIGITAL  
CONVERTER  
AD7416  
TEMPERATURE  
VALUE  
REGISTER  
Overtemperature indicator  
SETPOINT  
COMPARATOR  
Automatic power-down at the end of a conversion  
Wide operating supply range: 2.7 V to 5.5 V  
I2C-compatible serial interface  
Selectable serial bus address allows connection of up to 8  
AD7416/AD7417 devices to a single bus  
AD7416 is a superior replacement for LM75  
T
SETPOINT  
OTI  
REGISTER  
ADDRESS  
POINTER  
REGISTER  
8
V
DD  
T
SETPOINT  
HYST  
REGISTER  
3
4
OTI  
FAULT  
QUEUE  
COUNTER  
CONFIGURATION  
REGISTER  
GND  
SDA  
SCL  
7
6
5
A0  
A1  
A2  
1
2
SERIAL BUS  
INTERFACE  
APPLICATIONS  
Data acquisition with ambient temperature monitoring  
Industrial process control  
Automotive  
Figure 1. AD7416  
REF  
5
V
DD  
IN  
14  
Battery-charging applications  
Personal computers  
T
SETPOINT  
REGISTER  
OTI  
A > B  
A
B
4
OTI  
TEMP  
SENSOR  
CHARGE  
DISTRIBUTION  
DAC  
DATA OUT  
REF  
2.5V  
GENERAL DESCRIPTION  
The AD7417 and AD7418 are 10-bit, 4-channel and single-channel  
ADCs with an on-chip temperature sensor that can operate from a  
single 2.7 V to 5.5 V power supply. The devices contain a 15 μs  
successive approximation converter, a 5-channel multiplexer, a  
temperature sensor, a clock oscillator, a track-and-hold, and a  
reference (2.5 V). The AD7416 is a temperature-monitoring only  
device in an 8-lead package.  
3
2
SCL  
SDA  
7
A
A
A
A
IN1  
CONTROL  
LOGIC  
2
I C  
CLOCK  
INTERFACE  
8
9
IN2  
IN3  
IN4  
SAMPLING  
MUX  
CAPACITOR  
10  
AD7417  
V
BALANCE  
1
16  
NC NC  
NC = NO CONNECT  
6
15  
13  
12  
11  
A2  
GND  
CONVST  
A0  
A1  
The temperature sensor on the parts can be accessed via multip-  
lexer Channel 0. When Channel 0 is selected and a conversion  
is initiated, the resulting ADC code at the end of the conversion  
gives a measurement of the ambient temperature (±1°C @ 25°C).  
On-chip registers can be programmed with high and low tempera-  
ture limits, and an open-drain overtemperature indicator (OTI)  
output is provided, which becomes active when a programmed  
limit is exceeded.  
Figure 2. AD7417  
V
REF  
6
DD  
7
IN  
T
SETPOINT  
B
OTI  
REGISTER  
A > B  
A
3
OTI  
TEMP  
SENSOR  
CHARGE  
DISTRIBUTION  
DAC  
DATA OUT  
REF  
2.5V  
2
1
SCL  
SDA  
A configuration register allows programming of the sense of the  
OTI output (active high or active low) and its operating mode  
(comparator or interrupt). A programmable fault queue counter  
allows the number of out-of-limit measurements that must  
occur before triggering the OTI output to be set to prevent  
spurious triggering of the OTI output in noisy environments.  
5
A
MUX  
IN  
CONTROL  
LOGIC  
2
I C  
CLOCK  
INTERFACE  
SAMPLING  
CAPACITOR  
AD7418  
V
BALANCE  
4
8
GND  
CONVST  
Figure 3. AD7418  
Rev. I  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 www.analog.com  
Fax: 781.461.3113 ©1998–2010 Analog Devices, Inc. All rights reserved.  
 

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