AD7993(RevPrF) 查看數據表（PDF） - Analog Devices

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AD7993
(Rev.:RevPrF)

4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP

Analog Devices 

AD7994/AD7993

Pin

Mnemonic

AGND

VDD

REFIN

VIN1

VIN3

VIN4

VIN2

AS

CONVST

ALERT/BUSY

SDA

SCL

PRELIMINARY TECHNICAL DATA

PIN FUNCTION DESCRIPTION

Function

Analog Ground. Ground reference point for all circuitry on the AD7994/AD7993. All analog

input signals should be referred to this GND voltage.

Power Supply Input. The VDD range for the AD7994/AD7993 is from +2.7V to +5.5V.

Voltage Reference Input. The External Reference for the AD7994/AD7993 should 0.1 µF

capacitor should be placed between the REFIN pin and AGND.

Analog Input 1. Single-ended analog input channel. The input range is 0V to REFIN.

Analog Input 3. Single-ended analog input channel. The input range is 0V to REFIN.

Analog Input 4. Single-ended analog input channel. The input range is 0V to REFIN.

Analog Input 2. Single-ended analog input channel. The input range is 0V to REFIN.

Logic Input. Address Select Input which selects one of three I2C addresses for the AD7994/

AD7993 as shown in Table I.

Logic Input Signal. Convert Start Signal. This is an edge triggered logic input. The rising

edge of this signal powers up the part. The power up time for the part is 1µs. The falling

edge of CONVST places the track/hold into hold mode and initiates a conversion. A power

up time of at least 1µs must be allowed for the CONVST high pulse, otherwise the conver-

sion result will be invalid. (See Modes of Operation Section)

Digital Output, selectable as an ALERT or BUSY output function. When configured as an

ALERT output, this pin acts as an Out of Range Indicator, and if enabled becomes active

when the conversion result violates the DATAHIGH or DATALOW values. See Limit Registers

section. When configured as a BUSY output, this pin becomes active when a conversion is in

progress.

Digital I/O. Serial Bus Bi-directional Data. Open-drain output. External pull-up resistor

required.

Digital Input. Serial Bus Clock. External pull-up resistor required.

AD7994/AD7993 PIN CONFIGURATION TSSOP

AGND 1

AGND 2

AGND 3

AGND 4

VDD 5

REFIN 6

VIN1 7

VIN3 8

AD7994

TOP VIEW

(Not to Scale)

16 AGND

15 SCL

14 SDA

13 ALERT

12 CONVST

11 AS

10 VIN2

9 VIN4

–8–

REV. PrF

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