AD7992(RevPrH) 데이터 시트보기 (PDF) - Analog Devices

부품명

상세내역

제조사

AD7992
(Rev.:RevPrH)

2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP

Analog Devices 

AD7992

Pin

Mnemonic

AGND

VDD

VIN2/REFIN

VIN1

AS

CONVST

ALERT/BUSY

SDA

SCL

PRELIMINARY TECHNICAL DATA

PIN FUNCTION DESCRIPTION

Function

Analog Ground. Ground reference point for all circuitry on the AD7992. All analog input

signals should be referred to this GND voltage.

Power Supply Input. The VDD range for the AD7992 is from +2.7V to +5.5V.

Analog Input 2 / Voltage Reference Input. In single-channel mode, this pin becomes the

reference voltage input, and an external reference should be applied at this pin. The external

reference input range is 1.2V to VDD. A 1 µF capacitor should be tied between this pin and

AGND. If bit D6 is set to 1 in the Configuration Register the AD7992 will operate in single

channel mode. In dual Channel mode, D6 in configuration register is 0, this pin provides the

second analog input channel. The reference voltage for the AD7992 is taken from the power

supply voltage in dual channel mode.

Analog Input 1. 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 AD7992 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 it 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. Open-Drain Output. External pull-up resister required.

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

required.

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

AD7992 PIN CONFIGURATION MSOP

CONVST 1

AGND 2

VDD 3

VIN2 / REFIN 4

VIN1 5

AD7992

TOP VIEW

(Not to Scale)

10 SCL

9 SDA

8 ALERT

7 AGND

6 AS

Part Number

AD7992-0

AD7992-0

AD7992-1

AD7992-1

AD7992-X1

Table I. I2C Address Selection

AS Pin

I2C Address

GND

VDD

GND

VDD

010 0001

010 0010

010 0011

010 0100

Float

010 0000

Note:-

1. If the AS pin is left floating on any of the AD7992 parts the device address will be 010 0000. This will give each AD7992 device three differ-

ent address options.

–6–

REV. PrH

Share Link: