AD7416-7418 Analog Devices, AD7416-7418 Datasheet - Page 5

• Manufacturer Part Number: AD7416-7418
• Description: 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
• Manufacturer: Analog Devices

Pin No.
1
2
3
4
5
6
7
8
Pin No.
1
2
3
4
5
6
7
8
REV. B
AD7416 PIN CONFIGURATION
Mnemonic
SDA
SCL
OTI
GND
A2
A1
A0
V
Mnemonic
SDA
SCL
OTI
GND
A
REF
V
CONVST
DD
IN
DD
GND
SDA
SCL
IN
OTI
1
2
3
4
SOIC/ SOIC
(Not to Scale)
TOP VIEW
AD7416
Description
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 that 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.
Ground reference for track/hold, comparator and capacitor DAC, and digital circuitry.
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.
Description
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 that 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.
Ground reference for track/hold, comparator and capacitor DAC, and digital circuitry.
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 V
to the configuration register of the AD7418 and choosing Channel 4. (See Control Byte section.)
Reference Input. An external 2.5 V reference can be connected to the AD7418 at this pin. To en-
able the on-chip reference the REF
nected to the AD7418, the internal reference will shut down.
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 s. If the CONVST pulse is greater than 4 s, the falling edge
of CONVST places the track/hold mode into hold mode and initiates a conversion. If the pulse is
less than 4 s, 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.)
8
7
6
5
V
A0
A1
A2
DD
AD7416 PIN FUNCTION DESCRIPTION
AD7418 PIN FUNCTION DESCRIPTION
–5–
IN
pin should be tied to GND. If an external reference is con-
REF
AD7418 PIN CONFIGURATION
. The analog input channel is selected by writing
GND
SDA
SCL
OTI
AD7416/AD7417/AD7418
1
2
3
4
SOIC/ SOIC
(Not to Scale)
TOP VIEW
AD7418
8
7
6
5
CONVST
V
REF
A
DD
IN
IN