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.

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.

Analog Input Channel. The input channel is single-ended with respect to GND. The input channel can

configuration register of the AD7418 and choosing Channel 4. (See Control Byte section.)

6

Reference Input. An external 2.5 V reference can be connected to the AD7418 at this pin. To enable the

AD7418, the internal reference will shut down.

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

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

AD7418