AD7992_15 Datasheet, PDF (1/29 Pages) Analog Devices – 2-Channel, 12-Bit ADC with IC-Compatible Interface in 10-Lead MSOP

2-Channel, 12-Bit ADC with I²C-Compatible
Interface in 10-Lead MSOP
AD7992
FEATURES
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
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
10-lead MSOP package
GENERAL DESCRIPTION
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.
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.
The AD7992 normally remains in a shutdown state while not
converting, and powers up only for conversions. The conversion
process can be controlled using the CONVST pin, by a
command mode where conversions occur across I²C write
operations, or an automatic conversion interval mode selected
through software control.
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.
Rev. 0
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However, no responsibility is assumed by Analog Devices for its use, nor for any
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Specifications subject to change without notice. No license is granted by implication
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V_IN1
V_IN2/REF_IN
V_DD
AS
FUNCTIONAL BLOCK DIAGRAM
GND
CONVST
AD7992
I/P
MUX
T/H
12-BIT SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
VIN2/REFIN
SOFTWARE
CONTROL
HYSTERESIS
REGISTER CH0
DATA_HIGH LIMIT
REGISTER CH1
DATA_LOW LIMIT
REGISTER CH1
HYSTERESIS
REGISTER CH1
DATA_HIGH LIMIT
REGISTER CH2
DATA_LOW LIMIT
REGISTER CH2
CONVERSION
RESULT
REGISTER
CONFIGURATION
REGISTER
ALERT STATUS
REGISTER
CYCLE TIMER
REGISTER
I²C INTERFACE
ALERT
SCL
SDA
GND
Figure 1.
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.
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.
6. One-shot and automatic conversion rates.
7. Registers store minimum and maximum conversion
results.
Table 1. Related Products
Part Number No. of Bits
AD7998
12
AD7994
12
AD7997
10
AD7993
10
No. of Channels
8
4
8
4
Package
20-TSSOP
16-TSSOP
20-TSSOP
16-TSSOP
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