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AD7418 데이터시트 PDF




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부품번호 AD7418 기능
기능 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
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AD7418 데이터시트, 핀배열, 회로
a10-Bit Digital Temperature Sensor (AD7416) and
Single/Four-Channel ADC (AD7417/AD7418)
AD7416/AD7417/AD7418
FEATURES
10-Bit ADC with 15 s and 30 s Conversion Times
Single and Four Single-Ended Analog Input Channels
On-Chip Temperature Sensor: –55؇C to +125؇C
On-Chip Track/Hold
Over-Temperature Indicator
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 Eight AD7416/AD7417s 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
FUNCTIONAL BLOCK DIAGRAMS
BANDGAP
TEMPERATURE
SENSOR
10-BIT
ANALOG-DIGITAL
CONVERTER
ADDRESS
POINTER
REGISTER
A0
A1
A2
TEMPERATURE
VALUE
REGISTER
TOTI SETPOINT
REGISTER
THYST SETPOINT
REGISTER
CONFIGURATION
REGISTER
SERIAL BUS
INTERFACE
AD7416
SETPOINT
COMPARATOR
FAULT
QUEUE
COUNTER
REFIN
VDD
+VS
OTI
GND
SDA
SCL
GENERAL DESCRIPTION
The AD7417 and AD7418 are 10-bit, single- and 4-channel
A/D converter with an on-chip temperature sensor that can
operate from a single +2.7 V to +5.5 V power supply. The de-
vices contain a 15 µs successive-approximation converter, a
5-channel multiplexer, a temperature sensor, a clock oscillator,
a track/hold, and a reference (+2.5 V). The AD7416 is a tem-
perature-monitoring-only device in an 8-lead package.
The temperature sensor on the parts can be accessed via multi-
plexer 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 temperature limits, and an open drain Over-Temperature
Indicator output (OTI) 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.
(continued on page 7)
I2C is a registered trademark of Philips Corporation.
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
TEMP
SENSOR
REF
2.5V
OVER-TEMP REG B
A>B
A
CHARGE
DISTRIBUTION
DAC
DATA OUT
VIN1
VIN2
VIN3
VIN4
MUX
SAMPLING
CAPACITOR
CLOCK
+
CONTROL
LOGIC
I2C
INTERFACE
VBALANCE
NC NC GND
CONVST
NC = NO CONNECT
AD7417
A0 A1 A2
VDD
REFIN
TEMP
SENSOR
REF
2.5V
OVER-TEMP REG B
A>B
A
CHARGE
DISTRIBUTION
DAC
DATA OUT
VIN1
MUX
SAMPLING
CAPACITOR
CLOCK
+
CONTROL
LOGIC
I2C
INTERFACE
AGND
VBALANCE
CONVST
AD7418
OTI
SCL
SDA
OTI
SCL
SDA
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999




AD7418 pdf, 반도체, 판매, 대치품
AD7416/AD7417/AD7418
Pin No.
1, 16
2
3
4
5
6
7–10
11
12
13
14
15
Mnemonic
NC
SDA
SCL
OTI
REFIN
GND
AIN1 to AIN4
A2
A1
A0
VDD
CONVST
AD7417 PIN FUNCTION DESCRIPTION
Description
No Connection. Do not connect anything to this pin.
Digital I/O. Serial Bus Bidirectional Data. Push-pull output.
Digital Input. Serial Bus Clock.
This is a logic output. The Over Temperature Indicator (OTI) is set if the result of a conversion on
Channel 0 (temperature sensor) is greater than an 8-bit word in the Over Temperature Register (OTR).
The signal is reset at the end of a serial read operation. Open-drain output.
Reference Input. An external 2.5 V reference can be connected to the AD7417 at this pin. To enable
the on-chip reference the REFIN pin should be tied to GND. If an external reference is connected to
the AD7417, the internal reference will shut down.
Ground Reference for Track/Hold, Comparator and Capacitor DAC, and Digital Circuitry.
Analog Input Channels. The AD7417 has four analog input channels. The input channels are single-
ended with respect to GND. The input channels can convert voltage signals in the range 0 V to VREF.
A channel is selected by writing to the configuration register of the AD7417. (See Control Byte section.)
Digital Input. The highest programmable bit of the Serial Bus Address.
Digital Input. The middle programmable bit of the Serial Bus Address.
Digital Input. The lowest programmable bit of the Serial Bus Address.
Positive Supply Voltage, +2.7 V to +5.5 V.
Logic Input Signal. Convert Start Signal. The rising edge of this signal fully powers up the part. The
power-up time for the part is 4 µs. If the CONVST pulse is greater than 4 µs, the falling edge of
CONVST places the track/hold mode into hold mode and initiates a conversion. If the pulse is less
than 4 µs, an internal timer ensures that the track/hold does not go into hold and conversion is not
initiated until the power-up time has elapsed. The track/hold goes into track mode again at the end of
conversion. (See Operating Mode section.)
AD7417 PIN CONFIGURATION
SOIC/TSSOP
NC 1
SDA 2
16 NC
15 CONVST
SCL 3
14 VDD
OTI 4 AD7417 13 A0
TOP VIEW
REFIN 5 (Not to Scale) 12 A1
GND 6
11 A2
AIN1 7
AIN2 8
10 AIN4
9 AIN3
NC = NO CONNECT
–4– REV. B

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AD7418 전자부품, 판매, 대치품
(continued from page 1)
An I2C-compatible serial interface allows the AD7416/AD7417/
AD7418 registers to be written to and read back. The 3 LSBs
of the AD7416/AD7417’s serial bus address can be selected,
which allows up to eight AD7416/AD7417s to be connected to
a single bus.
The AD7417 is available in a narrow body 0.15'' 16-lead small
outline IC (SOIC) and in a 16-lead, thin shrink small outline
package (TSSOP). The AD7416 and AD7418 are available in
8-lead SOIC and µSOIC packages.
PRODUCT HIGHLIGHTS
1. The AD7416/AD7417/AD7418 have an on-chip tempera-
ture sensor that allows an accurate measurement of the am-
bient temperature (± 1°C @ +25°C, ± 2°C over temperature)
to be made. The measurable temperature range is –55°C to
+125°C. An over-temperature indicator is implemented by
carrying out a digital comparison of the ADC code for
Channel 0 (temperature sensor) with the contents of the on-
chip over-temperature register.
2. The AD7417 offers a space saving 10-bit A/D solution with
four external voltage input channels, an on-chip temperature
sensor, an on-chip reference and clock oscillator.
3. The automatic power-down feature enables the AD7416/
AD7417/AD7418 to achieve superior power performance.
At slower throughput rates the part can be programmed to
operate in a low power shutdown mode allowing further
savings in power consumption.
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 change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (0000 . . . 000)
to (0000 . . . 001) from the ideal, i.e., GND + 1 LSB.
Offset Error Match
This is the difference in Offset Error between any two channels.
Gain Error
This is the deviation of the last code transition (1111 . . . 110)
to (1111 . . . 111) from the ideal, i.e., VREF – 1 LSB, after the
offset error has been adjusted out.
Gain Error Match
This is the difference in gain error between any two channels.
Track/Hold Acquisition Time
Track/hold acquisition time is the time required for the output
of the track/hold amplifier to reach its final value, within ± 1/2
LSB, after the end of conversion (the point at which the track/
hold returns to track mode). It also applies to situations where a
change in the selected input channel takes place or where there
is a step input change on the input voltage applied to the se-
lected AIN input of the AD7417 or AD7418. It means that the
user must wait for the duration of the track/hold acquisition
time after the end of conversion or after a channel change/step
input change to AIN before starting another conversion, to en-
sure that the part operates to specification.
REV. B
–7–

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