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AD7418ARUZ Datasheet(PDF) 5 Page - Analog Devices

Part No. AD7418ARUZ
Description  10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7418ARUZ Datasheet(HTML) 5 Page - Analog Devices

 
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REV. G
AD7416/AD7417/AD7418
–5–
AD7416 PIN FUNCTION DESCRIPTION
Pin No.
Mnemonic
Description
1
SDA
Digital I/O. Serial bus bidirectional data. Push-pull output.
2
SCL
Digital Input. Serial bus clock.
3
OTI
This is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is
greater that an 8-bit word in the OTR. The signal is reset at the end of a serial read operation. Open-
drain output.
4GND
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
5A2Digital Input. The highest programmable bit of the serial bus address.
6A1Digital Input. The middle programmable bit of the serial bus address.
7A0Digital Input. The lowest programmable bit of the serial bus address.
8VDD
Positive Supply Voltage, 2.7 V to 5.5 V.
AD7418 PIN FUNCTION DESCRIPTION
Pin No.
Mnemonic
Description
1
SDA
Digital I/O. Serial bus bidirectional data. Push-pull output.
2
SCL
Digital Input. Serial bus clock.
3
OTI
This is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is
greater that an 8-bit word in the OTR. The signal is reset at the end of a serial read operation. Open-
drain output.
4GND
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
5AIN
Analog Input Channel. The input channel is single-ended with respect to GND. The input channel can
convert voltage signals in the range 0 V to VREF. The analog input channel is selected by writing to the
configuration register of the AD7418 and choosing Channel 4. (See Control Byte section.)
6
REFIN
Reference Input. An external 2.5 V reference can be connected to the AD7418 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
AD7418, the internal reference will shut down.
7VDD
Positive Supply Voltage, 2.7 V to 5.5 V.
8
CONVST
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-and-hold mode into hold mode and initiates a conversion. If the pulse is less
than 4
µs, an internal timer ensures that the track-and-hold does not go into hold and conversion is not
initiated until the power-up time has elapsed. The track-and-hold goes into track mode again at the end
of conversion. (See Operating Mode section.)
AD7416 PIN CONFIGURATION
SOIC/MSOP
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
SDA
SCL
OTI
GND
VDD
A0
A2
AD7416
A1
AD7418 PIN CONFIGURATION
SOIC/MSOP
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
SDA
SCL
OTI
GND
CONVST
VDD
REFIN
AIN
AD7418


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