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AD7298 Dataheets PDF



Part Number AD7298
Manufacturers Analog Devices
Logo Analog Devices
Description 12-Bit SAR ADC
Datasheet AD7298 DatasheetAD7298 Datasheet (PDF)

Preliminary Technical Data FEATURES 12 bit SAR ADC 8 single-ended inputs Channel sequencer functionality Fast throughput of 1Msps Analog Input Range 0 to 2.5V 12-bit temperature-to-digital converter Temperature sensor accuracy of ±2°C typical Temperature range: −40°C to +125°C Specified for VDD of 2.8 V to 3.6V Logic Voltage VDRIVE = 1.65V to 3.6V Power-down current : <10 µA Internal 2.5V Reference Internal Power on Reset High speed serial interface SPI™ 20-lead LFCSP 8-Channel, 1MSPS, 12-Bit S.

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Preliminary Technical Data FEATURES 12 bit SAR ADC 8 single-ended inputs Channel sequencer functionality Fast throughput of 1Msps Analog Input Range 0 to 2.5V 12-bit temperature-to-digital converter Temperature sensor accuracy of ±2°C typical Temperature range: −40°C to +125°C Specified for VDD of 2.8 V to 3.6V Logic Voltage VDRIVE = 1.65V to 3.6V Power-down current : <10 µA Internal 2.5V Reference Internal Power on Reset High speed serial interface SPI™ 20-lead LFCSP 8-Channel, 1MSPS, 12-Bit SAR ADC with Temperature Sensor AD7298 FUNCTIONAL BLOCK DIAGRAM Figure 1. GENERAL DESCRIPTION The AD7298 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC with an internal temperature sensor. The part operates from a single 3.3V power supply and features throughput rates up to 1MSPS. The device contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 70 MHz. The AD7298 offers a programmable sequencer, which enables the selection of a pre-programmable sequence of channels for conversion. The device has an on-chip 2.5 V reference that can be www.DataSheet4U.com disabled to allow the use of an external reference. The AD7298 includes a high accuracy band-gap temperature sensor, which is monitored and digitized by the12-bit ADC to give a resolution of 0.25°C. The device offers a 4-wire serial interface compatible with SPI, and DSP interface standards. The AD7298 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also offers flexible power/throughput rate management options. The part is offered in a 20 lead LFCSP package. PRODUCT HIGHLIGHTS 1. Ideally suited to monitoring system variables in a variety of systems including telecommunications, process and industrial control. High Throughput rate of 1Msps per channel with Low Power Consumption. Eight Single-Ended Inputs with a Channel Sequencer. A consecutive sequence of channels can be selected on which the ADC cycles and converts. Integrated temperature sensor with 0.25°C resolution. 1. 2. 3. Table 1. AD7298 and Related Products Device AD7298 AD7291 Resolution 12-Bit 12-Bit Interface SPI I2 C Features 8 Channel ADC & Temp Sensor 8 Channel ADC & Temp Sensor Rev. PrA 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: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. Preliminary Technical Data SPECIFICATIONS AD7298 SPECIFICATIONS AD7298 VDD = 2.8V to 3.6V; VDRIVE = 1.65 V to 3.6 V; fSAMPLE = 1 MSPS, fSCLK = 20 MHz, fast SCLK mode; VREF = 2.5 V internal/external; TA = −40°C to +125°C, unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE Signal-to-Noise Ratio (SNR) 1 Signal-to-Noise (+ Distortion) Ratio (SINAD)1 Total Harmonic Distortion (THD)1 Spurious-Free Dynamic Range (SFDR)1 Intermodulation Distortion (IMD)1 Second-Order Terms Third-Order Terms Channel-to-Channel Isolation1 SAMPLE AND HOLD Aperture Delay2 Aperture Jitter2 Full Power Bandwidth DC ACCURACY Resolution Integral Nonlinearity (INL)1 Differential Nonlinearity (DNL)1 Offset Error Offset Error Matching Offset Temperature Drift Gain Error Gain Error Matching Gain Temperature Drift www.DataSheet4U.com ANALOG INPUT Input Voltage Ranges DC Leakage Current Input Capacitance Input Impedance REFERENCE INPUT/OUTPUT Reference Output Voltage3 Long-Term Stability Output Voltage Hysteresis1 Reference Input Voltage Range4 DC Leakage Current Input Capacitance VREF Output Impedance Reference Temperature Coefficient VREF Noise Min 70 70 Typ 71 71 −84 −85 −88 −88 −100 10 40 TBD TBD 12 ±0.5 ±0.5 ±1 ±0.5 4 ±1 ±0.5 0.5 0 ±0.01 32 TBD 2.4875 2.5 150 50 ±0.01 TBD 1 6 60 ±1 ±0.99 ±6 ±1 ±2 ±1 Max Unit dB dB dB dB fA = 40.1 kHz, fB = 41.5 kHz dB dB dB ns ps MHz MHz Bits LSB LSB LSB LSB ppm/°C LSB LSB ppm/°C V µA pF kΩ V ppm ppm V µA pF Ω ppm/°C µV rms Test Conditions/Comments fIN = 50 kHz sine wave 78 80 @ 3 dB @ 0.1 dB Guaranteed no missed codes to 12 bits VREF ±1 When in track @ 1 MSPS ±0.5% maximum @ 25°C For 1000 hours 2.5125 2.0 2.5 ±1 External reference applied to Pin VREF 25 Bandwidth = TBD kHz Rev. PrA | Page 2 of 18 Preliminary Technical Data Parameter LOGIC INPUTS Input High Voltage, VINH Input Low Voltage, VINL Input Current, IIN Input Capacitance, CIN2 LOGIC OUTPUTS Output High Voltage, VOH Output Low Voltage, VOL Floating State Leakage Current Floating State Output Capacitance2 TEMPERATURE SENSOR—INTERNAL Operating Range Accura.


AD7291 AD7298 LYP47B


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