2-Channel, 12-Bit ADC with I2C-Compatible
Interface in 10-Lead MSOP
AD7992
FUNCTIONAL BLOCK DIAGRAM
FEATURES
GND
CONVST
12-bit ADC with fast conversion time: 2 µs typ
2 single-ended analog input channels
Specified for VDD of 2.7 V to 5.5 V
Low power consumption
AD7992
V
1
12-BIT SUCCESSIVE
APPROXIMATION
ADC
IN
CONTROL
LOGIC
I/P
MUX
T/H
V
2/REF
IN
IN
Fast throughput rate: up to 188 kSPS
Sequencer operation
Temperature range: −40 °C to 125 °C
Automatic cycle mode
I2C®-compatible serial interface supports standard, fast,
and high speed modes
Out-of-range indicator/alert function
Pin-selectable addressing via AS
2 versions allow 5 I2C addresses
Shutdown mode: 1 µA max
VIN2/REFIN
SOFTWARE
CONTROL
V
DD
DATA
LIMIT
HIGH
REGISTER CH1
CONVERSION
RESULT
REGISTER
HYSTERESIS
REGISTER CH0
DATA
LIMIT
LOW
REGISTER CH1
CONFIGURATION
REGISTER
ALERT
DATA
LIMIT
HIGH
REGISTER CH2
ALERT STATUS
REGISTER
HYSTERESIS
REGISTER CH1
DATA
LIMIT
LOW
REGISTER CH2
CYCLE TIMER
REGISTER
AS
SCL
SDA
2
I C INTERFACE
10-lead MSOP package
GND
GENERAL DESCRIPTION
Figure 1.
The AD7992 is a 12-bit, low power, successive approximation
ADC with an I2C-compatible interface. The part operates from
a single 2.7 V to 5.5 V power supply and features a 2 µs conver-
sion time. The part contains a 2-channel multiplexer and track-
and-hold amplifier that can handle input frequencies up to
11 MHz.
PRODUCT HIGHLIGHTS
1. 2 µs conversion time and 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.
The AD7992 provides a 2-wire serial interface compatible with
I2C interfaces. The part comes in two versions, the AD7992-0
and the AD7992-1, and each version allows for at least two
different I2C addresses. The AD7992-0 supports standard and
fast I2C interface modes, and the AD7992-1 supports standard,
fast, and high speed I2C interface modes.
3. The part features automatic shutdown while not converting
to maximize power efficiency. Current consumption is
1 µA max when in shutdown mode at 3 V.
4. Reference can be driven up to the power supply.
5. Out-of-range indicator that can be software disabled or
enabled.
The AD7992 normally remains in a shutdown state while not
converting, and powers up only for conversions. The conversion
6. One-shot and automatic conversion rates.
7. Registers store minimum and maximum conversion
results.
process can be controlled using the
pin, by a
CONVST
command mode where conversions occur across I2C write
operations, or an automatic conversion interval mode selected
through software control.
Table 1. Related Products
Part Number
No. of Bits
No. of Channels
Package
20-TSSOP
16-TSSOP
20-TSSOP
16-TSSOP
The AD7992 requires an external reference in the range of 1.2 V
to VDD. This allows the widest dynamic input range to the ADC.
On-chip limit 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
conversion result violates the programmed high or low limits.
This output can be used as an interrupt.
AD7998
AD7994
AD7997
AD7993
12
12
10
10
8
4
8
4
Rev. 0
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
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