Datasheet AD7858, AD7858L (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 3 V to 5 V Single Supply, 200 kSPS, 8-Channel, 12-Bit, Serial Sampling ADC |
| Pages / Page | 32 / 1 — 3 V to 5 V Single Supply, 200 kSPS. 8-Channel, 12-Bit Sampling ADC. … |
| Revision | B |
| File Format / Size | PDF / 309 Kb |
| Document Language | English |
3 V to 5 V Single Supply, 200 kSPS. 8-Channel, 12-Bit Sampling ADC. AD7858/AD7858L. FEATURES. FUNCTIONAL BLOCK DIAGRAM
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3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC AD7858/AD7858L FEATURES FUNCTIONAL BLOCK DIAGRAM Specified for VDD of 3 V to 5.5 V AD7858—200 kSPS; AD7858L—100 kSPS AVDD AGND System and Self-Calibration with Autocalibration on Power-Up AIN1 AD7858/ Eight Single-Ended or Four Pseudo-Differential Inputs I/P T/H MUX AD7858L Low Power AIN8 DVDD AD7858: 12 mW (VDD = 3 V) 2.5V AD7858L: 4.5 mW (V REFERENCE DD = 3 V) COMP Automatic Power-Down After Conversion (25
W) Flexible Serial Interface: REF BUF DGND IN/REFOUT 8051/SPI™/QSPI™/
P Compatible C 24-Lead DIP, SOIC, and SSOP Packages REF1 CHARGE APPLICATIONS REDISTRIBUTION DAC Battery-Powered Systems (Personal Digital Assistants, CLKIN Medical Instruments, Mobile Communications) CREF2 SAR AND ADC CONVST Pen Computers CALIBRATION CONTROL BUSY Instrumentation and Control Systems MEMORY AND CAL CONTROLLER SLEEP High-Speed Modems GENERAL DESCRIPTION SERIAL INTERFACE/CONTROL REGISTER
The AD7858/AD7858L are high-speed, low-power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the
SYNC DIN DOUT SCLK
AD7858 being optimized for speed and the AD7858L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self-calibration and system calibration options to en-
PRODUCT HIGHLIGHTS
sure accurate operation over time and temperature and have a 1. Specified for 3 V and 5 V supplies. number of power-down options for low-power applications. 2. Automatic calibration on power-up. The part powers up with a set of default conditions and can 3. Flexible power management options including automatic operate as a read-only ADC. power-down after conversion. The AD7858 is capable of 200 kHz throughput rate while the 4. Operates with reference voltages from 1.2 V to V AD7858L is capable of 100 kHz throughput rate. The input DD. track-and-hold acquires a signal in 500 ns and features a 5. Analog input range from 0 V to VDD. pseudo-differential sampling scheme. The AD7858/AD7858L 6. Eight single-ended or four pseudo-differential input channels. voltage range is 0 to VREF with straight binary output coding. 7. System and self-calibration. Input signal range is to the supply and the part is capable of con- verting full power signals to 100 kHz. 8. Versatile serial I/O port (SPI/QSPI/8051/µP). CMOS construction ensures low power dissipation of typically 9. Lower power version AD7858L. 4.5 mW for normal operation and 1.15 mW in power-down mode with a throughput rate of 10 kSPS (VDD = 3 V). The part is available in 24-lead, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC), and 24-lead small shrink outline (SSOP) packages. See page 31 for data sheet index. SPI and QSPI are trademarks of Motorola, Inc. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
otherwise under any patent or patent rights of Analog Devices.
Fax: 781/326-8703 © Analog Devices, Inc., 2000
3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC AD7858/AD7858L FEATURES FUNCTIONAL BLOCK DIAGRAM Specified for VDD of 3 V to 5.5 V AD7858—200 kSPS; AD7858L—100 kSPS AVDD AGND System and Self-Calibration with Autocalibration on Power-Up AIN1 AD7858/ Eight Single-Ended or Four Pseudo-Differential Inputs I/P T/H MUX AD7858L Low Power AIN8 DVDD AD7858: 12 mW (VDD = 3 V) 2.5V AD7858L: 4.5 mW (V REFERENCE DD = 3 V) COMP Automatic Power-Down After Conversion (25
W) Flexible Serial Interface: REF BUF DGND IN/REFOUT 8051/SPI™/QSPI™/
P Compatible C 24-Lead DIP, SOIC, and SSOP Packages REF1 CHARGE APPLICATIONS REDISTRIBUTION DAC Battery-Powered Systems (Personal Digital Assistants, CLKIN Medical Instruments, Mobile Communications) CREF2 SAR AND ADC CONVST Pen Computers CALIBRATION CONTROL BUSY Instrumentation and Control Systems MEMORY AND CAL CONTROLLER SLEEP High-Speed Modems GENERAL DESCRIPTION SERIAL INTERFACE/CONTROL REGISTER
The AD7858/AD7858L are high-speed, low-power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the
SYNC DIN DOUT SCLK
AD7858 being optimized for speed and the AD7858L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read-only ADC. The ADC contains self-calibration and system calibration options to en-
PRODUCT HIGHLIGHTS
sure accurate operation over time and temperature and have a 1. Specified for 3 V and 5 V supplies. number of power-down options for low-power applications. 2. Automatic calibration on power-up. The part powers up with a set of default conditions and can 3. Flexible power management options including automatic operate as a read-only ADC. power-down after conversion. The AD7858 is capable of 200 kHz throughput rate while the 4. Operates with reference voltages from 1.2 V to V AD7858L is capable of 100 kHz throughput rate. The input DD. track-and-hold acquires a signal in 500 ns and features a 5. Analog input range from 0 V to VDD. pseudo-differential sampling scheme. The AD7858/AD7858L 6. Eight single-ended or four pseudo-differential input channels. voltage range is 0 to VREF with straight binary output coding. 7. System and self-calibration. Input signal range is to the supply and the part is capable of con- verting full power signals to 100 kHz. 8. Versatile serial I/O port (SPI/QSPI/8051/µP). CMOS construction ensures low power dissipation of typically 9. Lower power version AD7858L. 4.5 mW for normal operation and 1.15 mW in power-down mode with a throughput rate of 10 kSPS (VDD = 3 V). The part is available in 24-lead, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC), and 24-lead small shrink outline (SSOP) packages. See page 31 for data sheet index. SPI and QSPI are trademarks of Motorola, Inc. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
otherwise under any patent or patent rights of Analog Devices.
Fax: 781/326-8703 © Analog Devices, Inc., 2000
