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AD7949

更新时间： 2024-12-01 04:04:19
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亚德诺 - ADI /
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20页 2028K
描述
16-Bit, 8-Channel, 250 kSPS PulSAR㈢ ADC.

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AD7949 数据手册

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16-Bit, 8-Channel,  
250 kSPS PulSAR® ADC  
Preliminary Technical Data  
AD7689  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
2.7V to 5V  
0.5V to 4.096V  
0.5V to VDD  
16-bit resolution with no missing codes  
8-channel multiplexer with:  
Unipolar single ended or  
22μF  
0.1μF  
REFIN  
REF  
VDD  
Differential (GND sense)/Bipolar inputs  
Throughput: 250 kSPS  
INL/DNL: 0.6 LSB typical  
1.8V to  
VDD  
Band Gap  
REF  
VIO  
AD7689  
Temp  
Sensor  
Dynamic range: 93.5 dB  
CNV  
IN0  
IN1  
IN2  
IN3  
IN4  
IN5  
IN6  
IN7  
SINAD: 92.5 dB @ 20 kHz  
THD: −100 dB @ 20 kHz  
Analog input range:  
0 V to VREF with VREF up to VDD  
Reference:  
SCK  
SDO  
DIN  
16-Bit SAR  
ADC  
SPI Serial  
Interface  
MUX  
1-Pole  
LPF  
Sequencer  
Internal selectable 2.5 V/4.096 V or  
External buffered (up to 4.096 V)  
External (up to VDD)  
COM  
GND  
Figure 1.  
Internal temperature sensor  
Channel sequencer, selectable 1-pole filter, BUSY indicator  
No pipeline delay, SAR architecture  
Single-supply 2.7V – 5.5 V operation with  
1.8 V to 5 V logic interface  
Serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible  
Power dissipation:  
6 mW @ 5 V/100 kSPS  
Table 1. Multichannel14-/16-Bit PulSAR ADC  
500  
kSPS  
250  
ADC  
Driver  
Type  
Channels kSPS  
14-Bit  
16-Bit  
16-Bit  
8
4
8
AD7949  
AD7682  
AD7689  
ADA4841-x  
ADA4841-x  
ADA4841-x  
AD7699  
Standby current: 1 nA  
20-lead 4 mm × 4 mm LFCSP package  
GENERAL DESCRIPTION  
The AD7689 is an 8-channel 16-bit, charge redistribution  
successive approximation register (SAR), analog-to-digital  
converter (ADC) that operates from a single power supply, VDD.  
APPLICATIONS  
Battery-powered equipment  
Medical instruments  
Mobile communications  
Personal digital assitants  
Data acquisition  
Seismic data acquisition systems  
Instrumentation  
Process Control  
The AD7689 contains all of the components for use in a multi-  
channel, low power, data acquisition system including: a true 16-  
bit SAR ADC with no missing codes; an 8-channel, low crosstalk  
multiplexer useful for configuring the inputs as single ended (with  
or without ground sense), differential or bipolar; an internal low  
drift reference (selectable 2.5V or 4.096V) and buffer; a  
temperature sensor; a selectable 1-pole filter; and a sequencer  
useful when channels are continuously scanned in order.  
The AD7689 uses a simple SPI interface for writing to the  
configuration register and receiving conversion results. The SPI  
interface uses a separate supply, VIO, which is set to the host logic  
level.  
Power dissipation scales with throughput.  
The AD7689 is housed in a tiny 20-lead LFCSP with operation  
specified from −40°C to +85°C.  
Rev. PrC  
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  
Fax: 781.461.3113  
www.analog.com  
©2007 Analog Devices, Inc. All rights reserved.  
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