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AD7992 Datasheet(Fiches technique) 1 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
a
REV. PrH
09/03
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 200
3
2-Channel, 12-Bit ADC with I2C Compatible
Interfacein10-LeadMSOP
Preliminary Technical Data
PRELIMINARYTECHNICAL DATA
FUNCTIONAL BLOCK DIAGRAM
FEATURES
12-Bit ADC with Fast Conversion Time: 2
µµµµµs
Two Single-Ended Analog Input Channels
Specified for VDD of 2.7 V to 5.5 V
Low Power Consumption
Fast Throughput Rate:- 188 KSPS
Sequencer Operation
Automatic Cycle Mode
I2CR Compatible Serial Interface
I2CR Interface supports:
Standard, Fast, and High-Speed Modes
Out of Range Indicator/ALERT Function
Pin-Selectable Addressing via AS
Two Versions Allow Five I
2C Addresses
Shutdown Mode: 1µA max
10-Lead MSOP Package
GENERAL DESCRIPTION
The AD7992 is a 12-bit, high speed, low power, succes-
sive-approximation ADC. The part operates from a single
2.7 V to 5.5 V power supply and features a conversion
time of 2
µs. The part contains a two channel multiplexer
and track/hold amplifier which can handle input frequen-
cies in excess of TBD kHz.
The AD7992 provides a two-wire serial interface which is
compatible with I
2C interfaces. The part comes in two
versions, AD7992-0, and AD7992-1. Each version allows
for a minimum of two different I
2C addresses. The
AD7992-0 supports Standard and Fast I
2C interface
Modes, while the AD7992-1 supports Standard, Fast, and
two High-Speed I
2C Interface Modes.
The AD7992 normally remains in a power-down state
while not converting, powering up only to perform con-
versions. The conversion process can be controlled using
the
CONVST pin, an Automatic Conversion Cycle se-
lected through software control, or a mode where conver-
sions occur across read Address operations. The AD7992
uses advanced design techniques to achieve low power
dissipation with a fast conversion time. There are no pipe-
line delays associated with the part.
The reference for the part is applied externally and can be
in the range of 1.2V to VDD. This allows the widest dy-
namic input range to the ADC.
On-chip registers can be programmed with high and low
limits for the conversion result, and an open drain Out of
Range Indicator output (ALERT), becomes active when
the programmed high or low limits are violated. This
output can be used as an interrupt.
PRODUCT HIGHLIGHTS
1. 2
µs Conversion time with low power consumption.
2. I
2C Compatible Serial Interface with pin selectable
addresses. Two AD7992 versions allow five
AD7992 devices to be connected to the same serial bus.
3. The part features automatic shutdown while not convert-
ing to maximize power efficiency. Current consumption
is 1
µA max when in shutdown.
4. Reference can be driven up to the power supply.
5. Out of Range Indicator which can be software disabled/
enabled.
6. Oneshot and automatic conversion rates.
7. No Pipeline Delay
The part features a standard successive-approximation
ADC.
SMBus is a trademark and I
2C is a registered trademark of Philips Corporation
T/H
VIN1
12-BIT SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
I/P
MUX
VIN2/REFIN
AD7992
VDD
SCL
I2C INTERFACE
DATAHIGH LIMIT
REGISTER CH1
DATALOW LIMIT
REGISTER CH1
CONVERSION
RESULT REGISTER
CONFIGURATION
REGISTER
DATALOW LIMIT
REGISTER CH0
DATAHIGH LIMIT
REGISTER CH0
CYCLE TIMER
REGISTER
ALERT STATUS
REGISTER
SDA
GND
ALERT
CONVST
GND
AS
OSCILLATOR
HYSTERESIS
REGISTER CH0
HYSTERESIS
REGISTER CH1
Part Number
No. of Bits
No. of Channels
Package
AD7998
1 2
8
20
TSSOP
AD7994
1 2
4
16
TSSOP
AD7997
1 0
8
20
TSSOP
AD7993
1 0
4
16
TSSOP
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