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AD7265BSUZ

更新时间: 2024-02-18 17:45:38
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亚德诺 - ADI /
页数 文件大小 规格书
28页 690K
描述
Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC

AD7265BSUZ 数据手册

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Differential/Single-Ended Input, Dual  
1 MSPS, 12-Bit, 3-Channel SAR ADC  
AD7265  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
REF SELECT  
D
A
AV  
DV  
CAP  
DD  
DD  
Dual 12-bit, 3-channel ADC  
Throughput rate: 1 MSPS  
BUF  
T/H  
REF  
Specified for VDD of 2.7 V to 5.25 V  
Power consumption  
AD7265  
V
V
A1  
A2  
7 mW at 1 MSPS with 3 V supplies  
17 mW at 1 MSPS with 5 V supplies  
Pin-configurable analog inputs  
12-channel single-ended inputs  
6-channel fully differential inputs  
6-channel pseudo differential inputs  
70 dB SINAD at 50 kHz input frequency  
Accurate on-chip reference: 2.5 V  
0.2ꢀ maximum @ 25°C, 20 ppm/°C maximum  
Dual conversion with read 875 ns, 16 MHz SCLK  
High speed serial interface  
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible  
−40°C to +125°C operation  
Shutdown mode: 1 μA maximum  
32-lead LFCSP and 32-lead TQFP  
2 MSPS version, AD7266  
12-BIT  
V
V
A3  
A4  
SUCCESSIVE  
APPROXIMATION  
ADC  
OUTPUT  
DRIVERS  
MUX  
D
A
OUT  
V
V
A5  
A6  
SCLK  
CS  
RANGE  
SGL/DIFF  
A0  
CONTROL  
LOGIC  
A1  
A2  
V
V
B1  
B2  
V
DRIVE  
V
V
B3  
B4  
MUX  
12-BIT  
SUCCESSIVE  
APPROXIMATION  
ADC  
OUTPUT  
DRIVERS  
D
B
OUT  
T/H  
V
V
B5  
B6  
BUF  
AGND AGND AGND  
D
B
DGND  
DGND  
CAP  
GENERAL DESCRIPTION  
Figure 1.  
The AD72651 is a dual, 12-bit, high speed, low power, successive  
approximation ADC that operates from a single 2.7 V to 5.25 V  
power supply and features throughput rates of up to 1 MSPS. The  
device contains two ADCs, each preceded by a 3-channel  
multiplexer, and a low noise, wide bandwidth track-and-hold  
amplifier that can handle input frequencies in excess of 30 MHz.  
PRODUCT HIGHLIGHTS  
1. Two Complete ADC Functions Allow Simultaneous  
Sampling and Conversion of Two Channels.  
Each ADC has three fully/pseudo differential pairs, or six  
single-ended channels, as programmed. The conversion  
result of both channels is simultaneously available on  
separate data lines, or in succession on one data line if only  
one serial port is available.  
The conversion process and data acquisition use standard  
control inputs allowing easy interfacing to microprocessors or  
DSPs. The input signal is sampled on the falling edge of  
CS  
;
conversion is also initiated at this point. The conversion time is  
determined by the SCLK frequency. The AD7265 uses advanced  
design techniques to achieve very low power dissipation at high  
throughput rates. With 5 V supplies and a 1 MSPS throughput rate,  
the part consumes 4 mA maximum. The part also offers flexible  
power/throughput rate management when operating in normal  
mode, because the quiescent current consumption is so low.  
2. High Throughput with Low Power Consumption.  
The AD7265 offers a 1 MSPS throughput rate with 9 mW  
maximum power dissipation when operating at 3 V.  
3. The AD7265 offers both a standard 0 V to VREF input range  
and a 2 × VREF input range.  
4. No Pipeline Delay.  
The part features two standard successive approximation  
ADCs with accurate control of the sampling instant via a  
input and once off conversion control.  
The analog input range for the part can be selected to be a 0 V  
to VREF (or 2 × VREF) range, with either straight binary or twos  
complement output coding. The AD7265 has an on-chip 2.5 V  
reference that can be overdriven when an external reference is  
preferred. This external reference range is 100 mV to VDD. The  
AD7265 is available in 32-lead LFCSP and 32-lead TQFP.  
CS  
1 Protected by U.S. Patent No. 6,681,332.  
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  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 
 

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