AD7992 Analog Devices Data Handbook/Manual

2-Channel, 12-Bit ADC with I2C-Compatible

Interface in 10-Lead MSOP

AD7992

FEATURES FUNCTIONAL BLOCK DIAGRAM

12-bit ADC with fast conversion time: 2 µs typ GND CONVST

2 single-ended analog input channels

AD7992

Specified for VDD of 2.7 V to 5.5 V

VIN1 12-BIT SUCCESSIVE CONTROL

T/H APPROXIMATION LOGIC

Low power consumption VIN2/REFIN MUX

Fast throughput rate: up to 188 k SPS

VIN2/REFIN

SOFTWARE

Sequencer operation

CONTROL

DATAHIGH LIMIT

Temperature range: −40 °C to 125 °C

REGISTER CH1 CONVERSION

HYSTERESIS RESULT

Automatic cycle mode REGISTER CH0

REGISTER

DATALOW LIMIT

I2C®-compatible serial interface supports standard, fast, REGISTER CH1 CONFIGURATION

ALERT

REGISTER

and high speed modes

DATAHIGH LIMIT

Out-of-range indicator/alert function REGISTER CH2 ALERT STATUS HYSTERESIS REGISTER

Pin-selectable addressing via AS REGISTER CH1

DATALOW LIMIT CYCLE TIMER 2 versions allow 5 I2C addresses REGISTER CH2 REGISTER

Shutdown mode: 1 µA max SCL

I2C INTERFACE

10-lead MSOP package

GENERAL DESCRIPTION

Figure 1.

The AD7992 is a 12-bit, low power, successive approximation ADC with an I2C-compatible interface. The part operates from PRODUCT HIGHLIGHTS a single 2.7 V to 5.5 V power supply and features a 2 µs conver-

1. 2 µs conversion time and low power consumption.

sion time. The part contains a 2-channel multiplexer and track- www.BDTIC.c m/ADI

2. I2C-compatible serial interface with pin-selectable

and-hold amplifier that can handle input frequencies up to

addresses. Two AD7992 versions allow five AD7992

11 MHz.

devices to be connected to the same serial bus.

The AD7992 provides a 2-wire serial interface compatible with

3. The part features automatic shutdown while not converting

I2C interfaces. The part comes in two versions, the AD7992-0

to maximize power efficiency. Current consumption is

and the AD7992-1, and each version allows for at least two

1 µA max when in shutdown mode at 3 V.

different I2C addresses. The AD7992-0 supports standard and

4. Reference can be driven up to the power supply.

fast I2C interface modes, and the AD7992-1 supports standard,

fast, and high speed I2C interface modes. 5. Out-of-range indicator that can be software disabled or enabled.

The AD7992 normally remains in a shutdown state while not

6. One-shot and automatic conversion rates.

converting, and powers up only for conversions. The conversion

process can be controlled using the CONVST pin, by a 7. Registers store minimum and maximum conversion command mode where conversions occur across I2C write results. 3- 0-

operations, or an automatic conversion interval mode selected

through software control. Table 1. Related Products Part Number No. of Bits No. of Channels Package

The AD7992 requires an external reference in the range of 1.2 V

AD7998 12 8 20-TSSOP

to VDD. This allows the widest dynamic input range to the ADC.

AD7994 12 4 16-TSSOP

On-chip limit registers can be programmed with high and low

AD7997 10 8 20-TSSOP

limits for the conversion result, and an open-drain, out-of-

AD7993 10 4 16-TSSOP

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 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.

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