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AD7934_15

更新时间： 2024-09-28 01:19:23
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亚德诺 - ADI /
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32页 768K
描述
4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer

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AD7934_15 数据手册

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4-Channel, 1.5 MSPS, 10-Bit and 12-Bit  
Parallel ADCs with a Sequencer  
AD7933/AD7934  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
AGND  
Throughput rate: 1.5 MSPS  
DD  
Specified for VDD of 2.7 V to 5.25 V  
Low power  
AD7933/AD7934  
V
REFIN/  
V
REFOUT  
2.5V  
6 mW maximum at 1.5 MSPS with 3 V supplies  
13.5 mW maximum at 1.5 MSPS with 5 V supplies  
4 analog input channels with a sequencer  
Software configurable analog inputs  
4-channel single-ended inputs  
VREF  
V
V
0
IN  
IN  
CLKIN  
CONVST  
BUSY  
12-/10-BIT  
SAR ADC  
AND  
I/P  
MUX  
T/H  
CONTROL  
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 (AD7934)  
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  
The AD7933/AD7934 are 10-bit and 12-bit, high speed, low  
power, successive approximation (SAR) analog-to-digital  
converters (ADCs). The parts operate from a single 2.7 V to  
5.25 V power supply and feature throughput rates up to 1.5 MSPS.  
The parts contain a low noise, wide bandwidth, differential track-  
and-hold amplifier that handles input frequencies up to 50 MHz.  
These parts use advanced design techniques to achieve very low  
power dissipation at high throughput rates. They also feature  
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.  
PRODUCT HIGHLIGHTS  
The AD7933/AD7934 feature four analog input channels with a  
channel sequencer that allows a preprogrammed selection of  
channels to be sequentially converted. These parts can accept  
either single-ended, fully differential, or pseudo differential  
analog inputs.  
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. Single-supply operation with VDRIVE function.  
The VDRIVE function allows the parallel interface to connect  
directly to 3 V or 5 V processor systems independent of VDD  
6. No pipeline delay.  
The conversion process and data acquisition are controlled  
using standard control inputs that allow for easy interfacing to  
microprocessors and DSPs. The input signal is sampled on the  
.
CONVST  
falling edge of  
this point.  
, and the conversion is also initiated at  
CONVST  
7. Accurate control of the sampling instant via a  
input and once-off conversion control.  
The AD7933/AD7934 has an accurate on-chip 2.5 V reference  
that is used as the reference source for the analog-to-digital  
conversion. Alternatively, this pin can be overdriven to provide  
an external reference.  
Table 1. Related Devices  
Device  
No. of Bits  
12/10  
12  
No. of Channels  
Speed  
AD7938/AD7939  
AD7938-6  
8
8
4
1.5 MSPS  
625 kSPS  
625 kSPS  
AD7934-6  
12  
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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