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AD7997 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7997 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 32 page 8-Channel, 10- and 12-Bit ADCs with I2C- Compatible Interface in 20-Lead TSSOP AD7997/AD7998 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 10- and 12-bit ADC with fast conversion time: 2 µs typ 8 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 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 Shutdown mode: 1 µA max Temperature range: −40°C to +85°C 20-lead TSSOP package See the AD7992 and AD7994 for 2-channel and 4-channel equivalent devices, respectively GENERAL DESCRIPTION The AD7997/AD7998 are 8-channel, 10- and 12-bit, low power, successive approximation ADCs with an I2C-compatible interface. The parts operate from a single 2.7 V to 5.5 V power supply and feature a 2 µs conversion time. The parts contain an 8-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz. The AD7997/AD7998 provide a 2-wire serial interface that is compatible with I2C interfaces. Each part comes in two versions, AD7997-0/AD7998-0 and AD7997-1/AD7998-1, and each version allows at least two different I2C addresses. The I2C interface on the AD7997-0/AD7998-0 supports standard and fast I2C interface modes. The I2C interface on the AD7997-1/ AD7998-1 supports standard, fast, and high speed I2C interface modes. The AD7997/AD7998 normally remain in a shutdown state while not converting, and power 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 AD7997/AD7998 require an external reference that should be applied to the REFIN pin and can be in the range of 1.2 V to VDD. This allows the widest dynamic input range to the ADC. FUNCTIONAL BLOCK DIAGRAM VIN1 10-/12-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC 8:1 I/P MUX AD7997/AD7998 VDD SCL I2C INTERFACE CYCLE TIMER REGISTER ALERT STATUS REGISTER CONFIGURATION REGISTER CONVERSION RESULT REGISTER SDA AGND ALERT/BUSY CONVST AGND AS OSCILLATOR REFIN VIN8 DATALOWLIMIT REGISTER CH1–CH4 T/H DATAHIGHLIMIT REGISTER CH1–CH4 HYSTERESIS REGISTER CH1–CH4 Figure 1. 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 programmed high or low limits are violated by the conversion result. This output can be used as an interrupt. PRODUCT HIGHLIGHTS 1. 2 µs conversion time with low power consumption. 2. I2C-compatible serial interface with pin-selectable addresses. Two AD7997/AD7998 versions allow five AD7997/AD7998 devices to be connected to the same serial bus. 3. The parts feature automatic shutdown while not converting to maximize power efficiency. Current consumption is 1 µA max when in shutdown mode at 3V. 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. |
Codice articolo simile - AD7997_15 |
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Descrizione simile - AD7997_15 |
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