AD7992 Datasheet, PDF (1/21 Pages) Analog Devices – 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP

PRELIMINARY TECHNICAL DATA
a
2-Channel, 12-Bit ADC with I²C Compatible
Interface in 10-Lead MSOP
Preliminary Technical Data
AD7992
FEATURES
FUNCTIONAL BLOCK DIAGRAM
12-Bit ADC with Fast Conversion Time: 2 µs
Two Single-Ended Analog Input Channels
VDD
GND
CONVST
Specified for V_DD of 2.7 V to 5.5 V
Low Power Consumption
Fast Throughput Rate:- 188 KSPS
Sequencer Operation
VIN1
VIN2/REFIN
AD7992
I/P
MUX
T/H
12-BIT SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
Automatic Cycle Mode
I²C^R Compatible Serial Interface
OSCILLATOR
I²C^R Interface supports:
Standard, Fast, and High-Speed Modes
Out of Range Indicator/ALERT Function
Pin-Selectable Addressing via AS
Two Versions Allow Five I²C Addresses
HYSTERESIS
REGISTER CH0
DATAHIGH LIMIT
REGISTER CH0
DATALOW LIMIT
REGISTER CH0
CONVERSION
RESULT REGISTER
CONFIGURATION
REGISTER
ALERT
Shutdown Mode: 1µA max
10-Lead MSOP Package
HYSTERESIS
DATAHIGH LIMIT
REGISTER CH1
ALERT STATUS
REGISTER
GENERAL DESCRIPTION
REGISTER CH1
DATALOW LIMIT
CYCLE TIMER
The AD7992 is a 12-bit, high speed, low power, succes-
AS
sive-approximation ADC. The part operates from a single
REGISTER CH1
REGISTER
I2C INTERFACE
SCL
2.7 V to 5.5 V power supply and features a conversion
SDA
time of 2 µs. The part contains a two channel multiplexer
GND
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 I²C interfaces. The part comes in two
versions, AD7992-0, and AD7992-1. Each version allows
for a minimum of two different I²C addresses. The
PRODUCT HIGHLIGHTS
1. 2 µs Conversion time with low power consumption.
2. I²C Compatible Serial Interface with pin selectable
addresses. Two AD7992 versions allow five
AD7992 devices to be connected to the same serial bus.
AD7992-0 supports Standard and Fast I²C interface
3. The part features automatic shutdown while not convert-
Modes, while the AD7992-1 supports Standard, Fast, and
two High-Speed I²C Interface Modes.
ing to maximize power efficiency. Current consumption
is 1µA max when in shutdown.
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 V_DD. 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.
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.
Part Number No. of Bits No. of Channels Package
AD7998
12
8
20 TSSOP
AD7994
12
4
16 TSSOP
AD7997
10
8
20 TSSOP
AD7993
10
4
16 TSSOP
Table 1. Related Products
SMBus is a trademark and I²C is a registered trademark of Philips Corporation
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.
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Analog Devices, Inc., 2003