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AD7992 Datasheet(Fiches technique) 6 Page - Analog Devices

Numéro de pièce AD7992
Description  2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP
Télécharger  21 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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AD7992
–6–
REV. PrH
PRELIMINARYTECHNICAL DATA
PIN FUNCTION DESCRIPTION
Pin
Mnemonic
Function
AGND
Analog Ground. Ground reference point for all circuitry on the AD7992. All analog input
signals should be referred to this GND voltage.
V DD
Power Supply Input. The VDD range for the AD7992 is from +2.7V to +5.5V.
VIN2/REFIN
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.
VIN1
Analog Input 1. Single-ended analog input channel. The input range is 0V to REFIN.
A S
Logic Input. Address Select input which selects one of three I
2C addresses for the AD7992 as
shown in Table I.
CONVST
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 1
µs. The falling
edge of
CONVST places the track/hold into hold mode and initiates a conversion. A power
up time of at least 1
µs must be allowed for the CONVST high pulse, otherwise the conver-
sion result will be invalid. (See Modes of Operation Section)
ALERT/BUSY
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.
S D A
Digital I/O. Serial Bus Bi-directional Data. Open-drain output. External pull-up resistor
required.
S C L
Digital Input. Serial Bus Clock. Open Drain. External pull-up resistor required.
AD7992 PIN CONFIGURATION MSOP
Table I. I
2C Address Selection
Part Number
AS Pin
I
2C Address
AD7992-0
G N D
010 0001
AD7992-0
V DD
010 0010
AD7992-1
G N D
010 0011
AD7992-1
V DD
010 0100
AD7992-X
1
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.
AD7992
TOP VIEW
1
2
3
4
7
8
9
10
CONVST
SDA
SCL
VDD
AGND
VIN1
(Not to Scale)
ALERT
6
5
AGND
VIN2 / REFIN
AS




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