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AD8333

更新时间: 2024-01-19 01:55:40
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
28页 683K
描述
DC to 50 MHz, Dual I/Q Demodulator and Phase Shifter

AD8333 技术参数

生命周期:Obsolete包装说明:QCCN, LCC32,.2SQ,20
Reach Compliance Code:compliant风险等级:5.84
JESD-30 代码:S-PQCC-N32负电源额定电压:-5 V
端子数量:32最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:QCCN封装等效代码:LCC32,.2SQ,20
封装形状:SQUARE封装形式:CHIP CARRIER
电源:+-5 V认证状态:Not Qualified
子类别:Other Telecom ICs标称供电电压:5 V
表面贴装:YES温度等级:INDUSTRIAL
端子形式:NO LEAD端子节距:0.5 mm
端子位置:QUADBase Number Matches:1

AD8333 数据手册

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DC to 50 MHz,  
Dual I/Q Demodulator and Phase Shifter  
AD8333  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
CH1  
Dual integrated I/Q demodulator  
16 phase select on each output (22.5° per step)  
Quadrature demodulation accuracy  
Phase accuracy: 0.1°  
Amplitude balance: 0.05 dB  
Bandwidth  
4 LO: 100 kHz to 200 MHz  
RF: dc to 50 MHz  
Baseband: determined by external filtering  
Output dynamic range: 161 dB/Hz  
LO drive > 0 dBm (50 Ω); 4 LO > 1 MHz  
Supply: 5 V  
PHASE  
SELECT  
+
CH1  
RF  
0°  
I1  
Φ
Φ
Φ
Φ
AD8333  
90°  
90°  
0°  
Q1  
Q2  
I2  
LOC  
OSC  
÷4  
Power consumption: 190 mW/channel (380 mW total)  
Power down  
+
CH2  
RF  
APPLICATIONS  
CH2  
PHASE  
SELECT  
Medical imaging (CW ultrasound beamforming)  
Phased array systems (radar and adaptive antennas)  
Communication receivers  
Figure 1.  
GENERAL DESCRIPTION  
The AD8333 is a dual-phase shifter and I/Q demodulator that  
enables coherent summing and phase alignment of multiple  
analog data channels. It is the first solid-state device suitable for  
beamformer circuits, such as those used in high performance  
medical ultrasound equipment featuring CW Doppler. The RF  
inputs interface directly with the outputs of the dual-channel,  
low noise preamplifiers included in the AD8332.  
Phase shift is defined by the output of one channel relative to  
another. For example, if the code of Channel 1 is adjusted to  
0000 and that of Channel 2 to 0001 and the same signal is  
applied to both RF inputs, the output of Channel 2 leads that  
of Channel 1 by 22.5°.  
The I and Q outputs are provided as currents to facilitate  
summation. The summed current outputs are converted to  
voltages by a high dynamic-range, current-to-voltage (I-V)  
converter, such as the AD8021, configured as a transimpedance  
amplifier. The resultant signal is then applied to a high resolution  
ADC, such as the AD7665 (16 bit/570 kSPS).  
A divide-by-four circuit generates the internal 0° and 90° phases  
of the LO that drive the mixers of a pair of matched I/Q  
demodulators.  
The AD8333 can be applied as a major element in analog  
beamformer circuits in medical ultrasound equipment.  
The two I/Q demodulators can be used independently in other  
nonbeamforming applications. In that case, a transimpedance  
amplifier is needed for each of the I and Q outputs, four in total  
for the dual I/Q demodulator.  
The AD8333 features an asynchronous reset pin. When used in  
arrays, the reset pin sets all the LO dividers in the same state.  
Sixteen discrete phase rotations in 22.5° increments can be  
selected independently for each channel. For example, if CH1 is  
used as a reference and the RF signal applied to CH2 has an I/Q  
phase lead of 45°, then the user can phase align CH2 with CH1  
by choosing the correct code.  
The dynamic range is 161 dB/Hz at each I and Q output, but the  
following transimpedance amplifier is an important element in  
maintaining the overall dynamic range, and attention needs to  
be paid to optimal component selection and design.  
The AD8333 is available in a 32-lead LFCSP (5 mm × 5 mm)  
package for the industrial temperature range of −40°C to +85°C.  
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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