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

Numéro de référence AD7994
Description 4-Channel/ 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP
Fabricant Analog Devices 
Logo Analog Devices 





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AD7994 fiche technique
PRELIMINARYTECHNICAL DATA
a 4-Channel,12-/10-BitADCswithI2CCompatible
Interface in 16-Lead TSSOP
Preliminary Technical Data
AD7994/AD7993
FEATURES
FUNCTIONAL BLOCK DIAGRAM
12-Bit ADC with Fast Conversion Time: 2 µs
Four 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:
VDD
GND REFIN
AD7994/AD7993
VIN1
VIN2
VIN3
VIN4
I/P
MUX
T/H
12-/10-BIT
SUCCESSIVE
APPROXIMATION
ADC
CONVST
CONTROL
LOGIC
OSCILLATOR
Standard, Fast, and High-Speed Modes
Out of Range Indicator/Alert Function
Pin-Selectable Addressing via AS
Two Versions Allow Five I2C Addresses
Shutdown Mode: 1µA max
16-Lead TSSOP Package
DATALOW LIMIT
REGISTER CH1-CH4
DATAHIGH LIMIT
REGISTER CH1-CH4
CONVERSION
RESULT REGISTER
CONFIGURATION
REGISTER
ALERT STATUS
REGISTER
ALERT
GENERAL DESCRIPTION
The AD7994/AD7993 are 4 channel, 12-/10-bit, high
speed, low power, successive-approximation ADCs re-
spectively. They operate from a single 2.7 V to 5.5 V
AS
HYSTERESIS
REGISTER CH1-CH4
CYCLE TIMER
REGISTER
I2C INTERFACE
SCL
SDA
power supply and feature a conversion time of 2 µs. The
GND
parts contain a four channel multiplexer and track/hold
amplifier which can handle input frequencies in excess of
TBD kHz.
The AD7994/AD7993 provide a two-wire serial interface
which is compatible with I2C interfaces. The parts come
in two versions, AD7994-0/AD7993-0 to AD7994-1/
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 by the
conversion result. This output can be used as an interrupt.
AD7993-1. Each version allows for a minimum of two
different I2C addresses. The I2C interface on the AD7994-
0/AD7993-0 supports Standard and Fast I2C Interface
Modes. The I2C interface on the AD7994-1/AD7993-1
supports Standard, Fast and two High-Speed I2C Interface
Modes.
The AD7994/AD7993 normally remain in a shutdown
state while not converting, powering up only for conver-
sions. The conversion process can be controlled using the
CONVST pin, an Automatic Conversion Cycle selected
PRODUCT HIGHLIGHTS
1. 2 µs Conversion time with low power consumption.
2. I2C Compatible Serial Interface with pin selectable
addresses. Two AD7994/AD7993 versions allow five
AD7994/AD7993 devices to be connected to the same
serial bus.
3. The parts feature automatic shutdown while not convert-
ing to maximize power efficiency. Current consumption
is 1µA max when in shutdown.
through software control, or a mode where conversions
4. Reference can be driven up to the power supply.
occur across Write operations. There are no pipeline de-
lays associated with the part.
5. Out of Range Indicator which can be software disabled/
enabled.
The reference for the part is applied externally to the
REFIN pin and can be in the range of 1.2V to VDD. This
allows the widest dynamic input range to the ADC.
6. Oneshot and automatic conversion rates.
7. No Pipeline Delay
The part features a standard successive-approximation
ADC.
SMBus is a trademark and I2C is a registered trademark of Philips Corporation
REV. PrF 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., 2003

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