AD7416/AD7417/AD7418

Rev. I | Page 8 of 24

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

NC

16

CONVST

15

14

A0

13

A1

12

A2

11

10

9

NC = NO CONNECT

AD7417

TOP VIEW

(Not to Scale)

Figure 6. AD7417 Pin Configuration (SOIC/TSSOP)

Table 4. AD7417 Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 16

NC

No Connection. Do not connect anything to this pin.

2

SDA

Digital I/O. Serial bus bidirectional data. Push-pull output.

3

SCL

Digital Input. Serial bus clock.

4

OTI

This pin is a logic output. The overtemperature indicator (OTI) is set if the result of a conversion on Channel 0

serial read operation. Open-drain output.

5

Reference Input. An external 2.5 V reference can be connected to the AD7417 at this pin. To enable the on-chip

reference shuts down.

6

GND

Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.

7 to 10

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 of 0 V to VREF. A channel is selected by

writing to the configuration register of the AD7417.

11

A2

Digital Input. This is the highest programmable bit of the serial bus address.

12

A1

Digital Input. This is the middle programmable bit of the serial bus address.

13

A0

Digital Input. This is the lowest programmable bit of the serial bus address.

14

Positive Supply Voltage, 2.7 V to 5.5 V.

15

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 the

section).

Operating Modes