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.

A divide-by-4 circuit generates the internal 0° and 90° phases of the local oscillator (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 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°, CH2 can be phase aligned with CH1 by choosing the correct code.

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).

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 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.

Applications

Medical imaging (CW ultrasound beamforming)

Phased array systems (radar and adaptive antennas)

Communication receivers

Data Sheet, Rev. B, 5/07

Part#	Function	RF Freq (MHz)	IQ Freq (MHz)	Phase Error (deg)	Amplitude Error (dB)	VGA Range (dB)	Noise Floor (dBm/Hz)	Voltage Supply (V)	Supply Current (max)	Package	Price* (1000-4999)
AD630	Demod, Mod	dc to 2	-	-	-	-	-	+/- 15	5	20-Lead DIP	$6.25
AD8333	Demod	dc to 50	-	0.1	0.05	-	-161	+/- 5	44	32-Lead LFCSP	$9.06
AD8339	Demod	dc to 50	50	1	0.25	-	-	4.5 to 5.5	35	40-Lead LFCSP	$12.09
AD8340	Vector Mod	700 to 1000	-	-	-	-	-	5	130	24-Lead LFCSP	$7.59
AD8341	Vector Mod	1500 to 2400	-	-	-	-	-150.5	4.75 to 5.25	125	24-Lead LFCSP	$7.59
AD8345	Mod	140 to 1000	80	0.5	0.2	-	-155	2.7 to 5.5	65	16-Lead Tssop	$5.02
AD8346	Mod	800 to 2500	70	1	0.2	-	-147	2.7 to 5.5	45	16-Lead Tssop	$4.45
AD8347	Demod	800 to 2700	65	1	0.3	69.5	-	2.7 to 5.5	64	28-Lead TSSOP	$5.85
AD8348	Demod	50 to 1000	75	0.5	0.25	45	-	2.7 to 5.5	58	28-Lead TSSOP	$5.01
AD8349	Mod	700 to 2700	160	0.3	0.1	-	-156	5	135	16-Lead Tssop	$5.02
ADL5370	Mod	250 to 1300	700	-	-	-	-156	4.75 to 5.5	210	24-Lead LFCSP	$5.04
ADL5371	Mod	700 to 1300	700	-	-	-	-156	4.75 to 5.5	175	24-Lead LFCSP	$5.04
ADL5372	Mod	1500 to 2500	700	-	-	-	-158	4.75 to 5.5	175	24-Lead LFCSP	$5.04
ADL5373	Mod	2300 to 3000	700	-	-	-	-156	4.75 to 5.5	175	24-Lead LFCSP	$5.04
ADL5374	Mod	2800 to 4000	700	-	-	-	-155	4.75 to 5.5	175	24-Lead LFCSP	$5.04
ADL5375	Mod	400 to 6000	500	-	-	-	-161	4.75 to 5.25	190	24-Lead LFCSP	$5.04
ADL5380	Demod	400 to 6000	-	-	-	-	-	-	-	-	-
ADL5382	Demod	700 to 2700	370	0.2	0.05	-	-	4.75 to 5.25	220	24-Lead LFCSP	$5.28
ADL5385	Mod	50 to 2200	500	0.33	0.03	-	-160	4.75 to 5.5	215	24-Lead LFCSP	$5.04
ADL5387	Demod	50 to 2000	240	0.4	0.1	-	-	4.75 to 5.25	180	24-Lead LFCSP	$5.28
ADL5390	Vector Mod	20 to 2400	230	-	-	-	-147	5	130	24-Lead LFCSP	$7.59
ADL5590	Mod	869 to 960	-	-	-	-	-157	4.75 to 5.25	170	36-Lead LFCSP	-
ADL5591	Mod	1805 to 1990	-	-	-	-	-157	4.75 to 5.25	170	36-Lead LFCSP	-

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