Datasheet AD7992 (Analog Devices)

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 I/P Low power consumption APPROXIMATION LOGIC V MUX T/H IN2/REFIN ADC Fast throughput rate: up to 188 kSPS VIN2/REFIN VDD Sequencer operation SOFTWARE CONTROL Temperature range: −40 °C to 125 °C DATAHIGH LIMIT REGISTER CH1 CONVERSION HYSTERESIS Automatic cycle mode RESULT REGISTER CH0 REGISTER I2C®-compatible serial interface supports standard, fast, DATALOW LIMIT REGISTER CH1 CONFIGURATION ALERT and high speed modes REGISTER DATAHIGH LIMIT Out-of-range indicator/alert function ALERT STATUS REGISTER CH2 REGISTER HYSTERESIS 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 AS SCL I2C INTERFACE 10-lead MSOP package SDA
001
GND
0- 03263-
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- and-hold amplifier that can handle input frequencies up to 2. I2C-compatible serial interface with pin-selectable 11 MHz. 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 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 fast I2C interface modes, and the AD7992-1 supports standard, 4. Reference can be driven up to the power supply. 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 converting, and powers up only for conversions. The conversion 6. One-shot and automatic conversion rates. 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. 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.
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Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS I2C TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION TYPICAL CONNECTION DIAGRAM ANALOG INPUT INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER CONFIGURATION REGISTER CONVERSION RESULT REGISTER LIMIT REGISTERS ALERT STATUS REGISTER CYCLE TIMER REGISTER SAMPLE DELAY AND BIT TRIAL DELAY SERIAL INTERFACE SERIAL BUS ADDRESS WRITING TO THE AD7992 WRITING TO THE ADDRESS POINTER REGISTER FOR A SUBSEQUENT REA WRITING A SINGLE BYTE OF DATA TO THE ALERT STATUS REGISTER, WRITING TWO BYTES OF DATA TO A LIMITREGISTER OR HYSTERESIS READING DATA FROM THE AD7992 ALERT/BUSY PIN SMBus ALERT PLACING THE AD7992-1 INTO HIGH SPEED MODE THE ADDRESS SELECT (AS) PIN MODES OF OPERATION MODE 1—USING THE /CONVST PIN MODE 2 – COMMAND MODE MODE 3—AUTOMATIC CYCLE MODE OUTLINE DIMENSIONS ORDERING GUIDE