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AD7998 Datasheet(PDF) 1 Page - Analog Devices |
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AD7998 Datasheet(HTML) 1 Page - Analog Devices |
1 / 28 page 2-Channel, 12-Bit ADC with I2C-Compatible Interface in 10-Lead MSOP AD7992 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 www.analog.com Fax: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved. 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. FUNCTIONAL BLOCK DIAGRAM CONTROL LOGIC AD7992 VDD SCL CONVERSION RESULT REGISTER CYCLE TIMER REGISTER ALERT STATUS REGISTER SDA GND ALERT GND CONVST AS VIN1 VIN2/REFIN DATAHIGH LIMIT REGISTER CH1 DATAHIGH LIMIT REGISTER CH2 DATALOW LIMIT REGISTER CH2 DATALOW LIMIT REGISTER CH1 HYSTERESIS REGISTER CH1 HYSTERESIS REGISTER CH0 I/P MUX T/H I2C INTERFACE CONFIGURATION REGISTER 12-BIT SUCCESSIVE APPROXIMATION ADC VIN2/REFIN SOFTWARE CONTROL 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 No. of Channels Package AD7998 12 8 20-TSSOP AD7994 12 4 16-TSSOP AD7997 10 8 20-TSSOP AD7993 10 4 16-TSSOP |
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