EVAL-AD7416/7/8EB

Manufacturer Part NumberEVAL-AD7416/7/8EB
DescriptionBOARD EVALUATION FOR AD7416/7/8
ManufacturerAnalog Devices Inc
EVAL-AD7416/7/8EB datasheet
 


Specifications of EVAL-AD7416/7/8EB

Sensor TypeTemperatureSensing Range-40°C ~ 125°C
InterfaceI²CVoltage - Supply2.7 V ~ 5.5 V
EmbeddedNoUtilized Ic / PartAD7416, AD7417, AD7418
Lead Free Status / RoHS StatusContains lead / RoHS non-compliant  
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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
Overtemperature indicator
Automatic power-down at the end of a conversion
Wide operating supply range: 2.7 V to 5.5 V
2
I
C-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
APPLICATIONS
Data acquisition with ambient temperature monitoring
Industrial process control
Automotive
Battery-charging applications
Personal computers
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.
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.
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.
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 registered trademarks are the property of their respective owners.
10-Bit Digital Temperature Sensor
(AD7416) and Four Single-Channel ADCs
AD7416/AD7417/AD7418
FUNCTIONAL BLOCK DIAGRAMS
BAND GAP
TEMPERATURE
SENSOR
ADDRESS
POINTER
REGISTER
A0
7
A1
6
A2
5
TEMP
SENSOR
A
7
IN1
A
8
IN2
MUX
CAPACITOR
A
9
IN3
A
10
IN4
1
16
NC
NC
GND
NC = NO CONNECT
V
DD
7
TEMP
SENSOR
REF
2.5V
A
MUX
5
IN
SAMPLING
CAPACITOR
GND
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
10-BIT
ANALOG-TO-DIGITAL
AD7416
CONVERTER
TEMPERATURE
VALUE
REGISTER
SETPOINT
COMPARATOR
T
SETPOINT
OTI
REGISTER
T
SETPOINT
HYST
REGISTER
FAULT
QUEUE
CONFIGURATION
COUNTER
REGISTER
SERIAL BUS
INTERFACE
Figure 1. AD7416
REF
V
IN
DD
5
14
T
SETPOINT
OTI
A > B
B
REGISTER
A
CHARGE
DISTRIBUTION
DATA OUT
DAC
REF
2.5V
CONTROL
2
CLOCK
I
C
LOGIC
INTERFACE
SAMPLING
AD7417
V
BALANCE
6
15
13
12
11
CONVST
A0
A1
A2
Figure 2. AD7417
REF
IN
6
T
SETPOINT
OTI
A > B
B
REGISTER
A
CHARGE
DATA OUT
DISTRIBUTION
DAC
CONTROL
2
I
C
CLOCK
LOGIC
INTERFACE
AD7418
V
BALANCE
4
8
CONVST
Figure 3. AD7418
www.analog.com
©1998–2010 Analog Devices, Inc. All rights reserved.
8
V
DD
OTI
3
GND
4
SDA
1
SCL
2
OTI
4
SCL
3
SDA
2
OTI
3
SCL
2
SDA
1

EVAL-AD7416/7/8EB Summary of contents

  • Page 1

    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 Overtemperature indicator Automatic power-down at the end of a conversion Wide operating supply range: ...

  • Page 2

    AD7416/AD7417/AD7418 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Product Highlights ........................................................................... 3 Specifications..................................................................................... 4 AD7417/AD7418 Specifications................................................. 4 AD7416 Specifications................................................................. 6 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 ...

  • Page 3

    An I C® compatible serial interface allows the AD7416/AD7417/ AD7418 registers to be written to and read back. The three LSBs of the AD7416/AD7417 serial bus address can be selected, which allows up to eight AD7416/AD7417 devices to be ...

  • Page 4

    AD7416/AD7417/AD7418 SPECIFICATIONS AD7417/AD7418 SPECIFICATIONS 5.5 V, GND = 0 V, REF DD IN Table 1. Parameter DC ACCURACY Resolution Minimum Resolution for Which No Missing Codes Are Guaranteed 2 Relative Accuracy 2 Differential Nonlinearity 2 ...

  • Page 5

    Parameter POWER REQUIREMENTS Normal Operation Power-Down Auto Power-Down Mode 10 SPS Throughput Rate 1 kSPS Throughput Rate 10 kSPS Throughput Rate Power-Down 1 B Version applies to AD7417 only with temperature range of −40°C to +85°C. ...

  • Page 6

    AD7416/AD7417/AD7418 AD7416 SPECIFICATIONS 5.5 V, GND = 0 V, REF DD IN Table 2. Parameter TEMPERATURE SENSOR AND ADC Accuracy Resolution Temperature Conversion Time Update Rate OTI Delay Supply Current T Default Temperature ...

  • Page 7

    ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V to AGND DGND DD Analog Input Voltage to AGND IN1 IN4 1 Reference Input Voltage to AGND Digital Input Voltage ...

  • Page 8

    AD7416/AD7417/AD7418 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 4. AD7417 Pin Function Descriptions Pin No. Mnemonic Description Connection. Do not connect anything to this pin. 2 SDA Digital I/O. Serial bus bidirectional data. Push-pull output. 3 SCL ...

  • Page 9

    SDA 1 AD7416 SCL 2 OTI 3 TOP VIEW (Not to Scale) GND 4 Figure 7. AD7416 Pin Configuration (SOIC/MSOP) Table 5. AD7416 Pin Function Descriptions Pin No. Mnemonic Description 1 SDA Digital I/O. Serial bus bidirectional data. Push-pull output. ...

  • Page 10

    AD7416/AD7417/AD7418 TERMINOLOGY Relative Accuracy Relative accuracy or endpoint nonlinearity is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB ...

  • Page 11

    THEORY OF OPERATION CIRCUIT INFORMATION The AD7417 and AD7418 are single-channel and four-channel, 15 μs conversion time, 10-bit ADCs with on-chip temperature sensor, reference, and serial interface logic functions on a single chip. The AD7416 has no analog input channel ...

  • Page 12

    AD7416/AD7417/AD7418 An external 2.5 V reference can be connected to the REF This has the effect of shutting down the on-chip reference circuitry. REF IN 1.2V SW1 1.2V 26kΩ 24kΩ Figure 11. On-Chip Reference TEMPERATURE MEASUREMENT A common method of ...

  • Page 13

    Table 8. Register Addresses Registers Temperature value Configuration register setpoint HYST setpoint OTI ADC value (AD7417/AD7418 only ...

  • Page 14

    AD7416/AD7417/AD7418 111...111 111...110 111...000 1LSB – VREF/1024 011...111 000...010 000...001 000...000 0V 1/2LSB +VREF – 1LSB ANALOG INPUT Figure 14. Ideal Transfer Function Characteristic for the AD7417/AD7418 Config2 Register (Address 0x05) A second configuration register is included in the AD7417/ ...

  • Page 15

    This is illustrated in Figure 16. • Writing two bytes of data to the T OTI setpoint register. If 9-bit resolution is required for the temperature setpoints, two bytes of data must be written ...

  • Page 16

    AD7416/AD7417/AD7418 Reading Data From the AD7416/AD7417/AD7418 Reading data from the AD7416/AD7417/AD7418 is a single- byte or 2-byte operation. Reading back the contents of the configuration register is a single-byte read operation, as shown in Figure 18, with the register address ...

  • Page 17

    OTI OUTPUT The OTI output has two operating modes that are selected by Bit D1 of the configuration register. In the comparator mode, (D1 = 0), the OTI output becomes active when the temperature exceeds T and remains active until ...

  • Page 18

    AD7416/AD7417/AD7418 Mode 2 For applications where temperature measurements are required at a slower rate, for example, every second, power consumption of the part can be reduced by writing to the part full power-down between reads. The ...

  • Page 19

    APPLICATIONS INFORMATION SUPPLY DECOUPLING The AD7416/AD7417/AD7418 should be decoupled with a 0.1 μF ceramic capacitor between V and GND. This is DD particularly important if the part is mounted remote from the power supply. POWER-ON RESET To ensure proper power-on ...

  • Page 20

    AD7416/AD7417/AD7418 SYSTEM WITH MULTIPLE AD7416 DEVICES The three LSBs of the AD7416 serial address can be set by the user, allowing eight different addresses from 1001000 to 1001111. Figure 25 shows a system in which eight AD7416 devices are connected ...

  • Page 21

    OUTLINE DIMENSIONS 4.00 (0.1575) 3.80 (0.1496) 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 10.00 (0.3937) 9.80 (0.3858 6.20 (0.2441) 1 5.80 (0.2283) 8 1.27 (0.0500) BSC 1.75 (0.0689) 1.35 (0.0531) SEATING 0.51 (0.0201) 0.25 ...

  • Page 22

    AD7416/AD7417/AD7418 0.15 0.05 5.10 5.00 4. 4.50 6.40 4.40 BSC 4. PIN 1 1.20 MAX 0.20 0.09 8° 0.30 0.65 0° 0.19 SEATING BSC PLANE COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-153-AB Figure 28. 16-Lead Thin ...

  • Page 23

    ... AD7418ARM-REEL7 −40°C to +125°C AD7418ARMZ −40°C to +125°C AD7418ARMZ-REEL −40°C to +125°C AD7418ARMZ-REEL7 −40°C to +125°C EVAL-AD7416/7/8EBZ RoHS Compliant Part. Temperature Error Package Description ±2°C 8-Lead Standard Small Outline Package (SOIC_N) ±2°C 8-Lead Standard Small Outline Package (SOIC_N) ± ...

  • Page 24

    AD7416/AD7417/AD7418 NOTES refers to a communications protocol originally developed by Philips Semiconductors (Now NXP Semiconductors). ©1998–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D01126-0-11/10(I) Rev ...