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| 型号： | EVAL-AD7266EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/29页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7266 A/D CONV |
| 标准包装： | 1 |
| ADC 的数量： | 2 |
| 位数： | 12 |
| 采样率（每秒）： | 2M |
| 数据接口： | SPI?、QSPI?、MICROWIRE? 和 DSP |
| 输入范围： | 0 ~ 5 V |
| 在以下条件下的电源（标准）： | 9mW @ 3V，27mW @ 5V |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7266 |
| 已供物品： | 板 |
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Differential/Single-Ended Input, Dual
2 MSPS, 12-Bit, 3-Channel SAR ADC
AD7266
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
2005–2011 Analog Devices, Inc. All rights reserved.
FEATURES
Dual 12-bit, 3-channel ADC
Throughput rate: 2 MSPS
Specified for VDD of 2.7 V to 5.25 V
Power consumption
9 mW at 1.5 MSPS with 3 V supplies
27 mW at 2 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 SNR at 50 kHz input frequency
Accurate on-chip reference: 2.5 V
±0.2% maximum @ 25°C, 20 ppm/°C maximum
Dual conversion with read 437.5 ns, 32 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
1 MSPS version, AD7265
GENERAL DESCRIPTION
The AD72661 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 up to 2 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.
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. There are no pipelined
delays associated with the part.
The AD7266 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. With 5 V
supplies and a 2 MSPS throughput rate, the part consumes
6.2 mA maximum. The part also offers flexible power/
throughput rate management when operating in normal mode
as the quiescent current consumption is so low.
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 AD7266 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.
FUNCTIONAL BLOCK DIAGRAM
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
DOUTA
OUTPUT
DRIVERS
CONTROL
LOGIC
T/H
BUF
VA1
VA2
VA3
VA4
VA5
VA6
MUX
REF
AD7266
VDRIVE
REF SELECT
DCAPA
AVDD
DVDD
BUF
DOUTB
OUTPUT
DRIVERS
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
T/H
VB1
VB2
VB3
VB4
VB5
VB6
MUX
AGND AGND AGND DCAPB
DGND
CS
SCLK
RANGE
SGL/DIFF
A0
A1
A2
04603-001
Figure 1.
The AD7266 is available in a 32-lead LFCSP and a
32-lead TQFP.
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.
2.
High Throughput with Low Power Consumption.
The AD7266 offers a 1.5 MSPS throughput rate with 11.4 mW
maximum power dissipation when operating at 3 V.
3.
The AD7266 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
CS input and once off conversion control.
1 Protected by U.S. Patent No. 6,681,332
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