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AD79461

更新时间： 2024-11-30 12:54:07
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亚德诺 - ADI /
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14-Bit, 500 kSPS PulSAR ADC in MSOP

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AD79461 数据手册

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14-Bit, 500 kSPS  
PulSAR ADC in MSOP  
AD7946  
APPLICATION DIAGRAM  
FEATURES  
0.5V TO 5V  
5V  
14-bit resolution with no missing codes  
Throughput: 500 kSPS  
INL: 0.4 LSB typical, 1 LSB maximum ( 0.0061% of FSR)  
SINAD: 85 dB @ 20 kHz  
THD: −100 dB @ 20 kHz  
Pseudo differential analog input range  
0 V to REF with REF up to VDD  
VIO  
SDI  
1.8V TO VDD  
REF VDD  
0V TO REF  
IN+  
IN–  
SCK  
SDO  
CNV  
AD7946  
3- OR 4-WIRE INTERFACE  
(SPI, DAISY CHAIN, CS)  
GND  
No pipeline delay  
Single-supply 5 V operation with  
1.8 V/2.5 V/3 V/5 V logic interface  
Serial interface, SPI/QSPI/MICROWIRE™/DSP compatible  
Daisy-chain multiple ADCs and BUSY indicator  
Power dissipation  
3.3 mW @ 5 V/100 kSPS  
3.3 μW @ 5 V/100 SPS  
Standby current: 1 nA  
Figure 1.  
GENERAL DESCRIPTION  
The AD7946 is a 14-bit, charge redistribution, successive  
approximation, analog-to-digital converter (ADC) that operates  
from a single 5 V power supply, VDD. It contains a low power,  
high speed, 14-bit sampling ADC with no missing codes, an  
internal conversion clock, and a versatile serial interface port.  
The part also contains a low noise, wide bandwidth, short  
aperture delay track-and-hold circuit. On the CNV rising edge,  
it samples an analog input IN+ between 0 V to REF with respect  
to a ground sense IN−. The reference voltage, REF, is applied  
externally and can be set up to the supply voltage.  
10-lead MSOP (MSOP-8 size) and  
3 mm × 3 mm QFN (LFCSP) (SOT-23 size)  
Pin-for-pin compatible with the 16-bit AD7686  
APPLICATIONS  
Battery-powered equipment  
Data acquisition  
Its power scales linearly with throughput.  
Instrumentation  
Medical instruments  
Process control  
The SPI-compatible serial interface also features the ability,  
using the SDI input, to daisy-chain several ADCs on a single,  
3-wire bus, or it provides an optional BUSY indicator. It is  
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate  
supply VIO.  
The AD7946 is housed in a 10-lead MSOP or a 10-lead QFN  
(LFCSP) with operation specified from −40°C to +85°C.  
Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR® ADC  
Type  
14-Bit  
16-Bit  
100 kSPS  
AD7940  
AD7680  
AD7683  
AD7684  
250 kSPS  
AD79421  
AD76851  
AD76871  
AD7694  
400 kSPS to 500 kSPS  
AD79461  
≥1000 kSPS  
ADC Driver  
AD76861  
AD79801  
AD79831  
ADA4941  
ADA4841  
AD76881  
AD76931  
18-Bit  
AD76911  
AD76901  
AD79821  
AD79841  
ADA4941  
ADA4841  
1 Pin-for-pin compatible.  
Rev. A  
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 registeredtrademarks arethe 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 ©2005–2007 Analog Devices, Inc. All rights reserved.  
 
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