AD8333

更新时间： 2024-11-21 04:31:03

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

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AD8333 数据手册

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

–

0°

AD8333

90°

0°

LOC

OSC

÷4

Power consumption: 190 mW/channel (380 mW total)

Power down

CH2

–

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

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AD8333ACPZ	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, QCC32, 5 X 5 MM, ROHS COMPLIANT, MO-220VHHD-2, LFCSP-32
AD8333ACPZ-REEL	ADI	获取价格	DC to 50 MHz, Dual I/Q Demodulator and Phase Shifter
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AD8333-WP	ADI	获取价格	IC,QUADRATURE DEMODULATOR,LLCC,32PIN,PLASTIC
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