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AD7934BRU-6REEL

更新时间： 2024-11-30 01:19:31
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亚德诺 - ADI /
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29页 617K
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4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer

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4-Channel, 625 kSPS, 12-Bit  
Parallel ADC with a Sequencer  
AD7934-6  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
AGND  
Throughput rate: 625 kSPS  
DD  
Specified for VDD of 2.7 V to 5.25 V  
Power consumption  
AD7934-6  
V
/
REFIN  
V
REFOUT  
2.5V  
3.6 mW maximum at 625 kSPS with 3 V supplies  
7.5 mW maximum at 625 kSPS with 5 V supplies  
4 analog input channels with a sequencer  
Software-configurable analog inputs  
4-channel single-ended inputs  
VREF  
V
0
IN  
IN  
CLKIN  
CONVST  
BUSY  
12-BIT  
SAR ADC  
AND  
I/P  
MUX  
T/H  
CONTROL  
V
3
2-channel fully differential inputs  
2-channel pseudo differential inputs  
Accurate on-chip 2.5 V reference  
0.2ꢀ maximum @ 25°C, 25 ppm/°C maximum  
70 dB SINAD at 50 kHz input frequency  
No pipeline delays  
SEQUENCER  
V
PARALLEL INTERFACE/CONTROL REGISTER  
DRIVE  
High speed parallel interface—word/byte modes  
Full shutdown mode: 2 μA maximum  
28-lead TSSOP package  
DB0 DB11  
CS RD WR W/B  
DGND  
Figure. 1  
GENERAL DESCRIPTION  
features flexible power management options. An on-chip control  
register allows the user to set up different operating conditions,  
including analog input range and configuration, output coding,  
power management, and channel sequencing.  
The AD7934-6 is a 12-bit, high speed, low power, successive  
approximation (SAR) analog-to-digital converter (ADC). The  
part operates from a single 2.7 V to 5.25 V power supply and  
features throughput rates up to 625 kSPS. The part contains a  
low noise, wide bandwidth, differential track-and-hold  
amplifier that handles input frequencies up to 50 MHz.  
PRODUCT HIGHLIGHTS  
1. High throughput with low power consumption.  
2. Four analog inputs with a channel sequencer.  
3. Accurate on-chip 2.5 V reference.  
4. Single-ended, pseudo differential, or fully differential  
analog inputs that are software selectable.  
5. No pipeline delay.  
The AD7934-6 features four analog input channels with a channel  
sequencer that allows a preprogrammed selection of channels to  
be converted sequentially. This part can accept either single-  
ended, fully differential, or pseudo differential analog inputs.  
Data acquisition and conversion are controlled by standard control  
inputs that allow for easy interfacing to microprocessors and  
CONVST  
6. Accurate control of the sampling instant via a  
input and once-off conversion control.  
CONVST  
DSPs. The input signal is sampled on the falling edge of  
,
which is also the point where the conversion is initiated.  
Table 1. Related Devices  
The AD7934-6 has an accurate on-chip 2.5 V reference that  
can be used as the reference source for the analog-to-digital  
conversion. Alternatively, this pin can be overdriven to provide  
an external reference.  
Similar Device  
AD7938/AD7939  
AD7933/AD7934  
AD7938-6  
No. of Bits No. of Channels  
Speed  
12/10  
10/12  
12  
8
4
8
1.5 MSPS  
1.5 MSPS  
625 kSPS  
The AD7934-6 uses advanced design techniques to achieve very  
low power dissipation at high throughput rates. The part also  
Rev. B  
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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