The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as the AD9201, AD9283, and AD9218, for digitizing and post-processing.

The IF input signal is fed into two Gilbert cell mixers through an X-AMP® VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.

The AD8348 is fabricated on an advanced bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 28 lead thin shrunk small outline (TSSOP) package and fully specified over the –40 to +85 C temperature range

Samples AD8348ARU and evaluation boards AD8348-EVAL are available

Other Modulator/Demodulator products

AD8345 250MHz – 1GHz RF/IF Modulator

AD8346 800MHz – 2.5GHz Modulator

AD8347 800MHz – 2.7GHz Demodulator

AD8349 700MHz – 2.7GHz Modulator

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	$6.18
AD8333	Demod	dc to 50	-	0.1	0.05	-	-161	+/- 5	44	32-Lead LFCSP	$8.95
AD8339	Demod	dc to 50	50	1	0.25	-	-	4.5 to 5.5	35	40-Lead LFCSP	$11.95
AD8340	Vector Mod	700 to 1000	-	-	-	-	-	5	130	24-Lead LFCSP	$7.50
AD8341	Vector Mod	1500 to 2400	-	-	-	-	-150.5	4.75 to 5.25	125	24-Lead LFCSP	$7.50
AD8345	Mod	140 to 1000	80	0.5	0.2	-	-155	2.7 to 5.5	65	16-Lead Tssop	$4.96
AD8346	Mod	800 to 2500	70	1	0.2	-	-147	2.7 to 5.5	45	16-Lead Tssop	$4.40
AD8347	Demod	800 to 2700	65	1	0.3	69.5	-	2.7 to 5.5	64	28-Lead TSSOP	$5.78
AD8348	Demod	50 to 1000	75	0.5	0.25	45	-	2.7 to 5.5	58	28-Lead TSSOP	$4.95
AD8349	Mod	700 to 2700	160	0.3	0.1	-	-156	5	135	16-Lead Tssop	$4.96
ADL5370	Mod	250 to 1300	700	-	-	-	-156	4.75 to 5.5	210	24-Lead LFCSP	$4.98
ADL5371	Mod	700 to 1300	700	-	-	-	-156	4.75 to 5.5	175	24-Lead LFCSP	$4.98
ADL5372	Mod	1500 to 2500	700	-	-	-	-158	4.75 to 5.5	175	24-Lead LFCSP	$4.98
ADL5373	Mod	2300 to 3000	700	-	-	-	-156	4.75 to 5.5	175	24-Lead LFCSP	$4.98
ADL5374	Mod	2800 to 4000	700	-	-	-	-155	4.75 to 5.5	175	24-Lead LFCSP	$4.98
ADL5375	Mod	400 to 6000	500	-	-	-	-161	4.75 to 5.25	190	24-Lead LFCSP	$4.98
ADL5382	Demod	700 to 2700	370	0.2	0.05	-	-	4.75 to 5.25	220	24-Lead LFCSP	$5.22
ADL5385	Mod	50 to 2200	500	0.33	0.03	-	-160	4.75 to 5.5	215	24-Lead LFCSP	$4.98
ADL5387	Demod	50 to 2000	240	0.4	0.1	-	-	4.75 to 5.25	180	24-Lead LFCSP	$5.22
ADL5390	Vector Mod	20 to 2400	230	-	-	-	-147	5	130	24-Lead LFCSP	$7.50
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	-

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

The model number is a specific version of a generic that can be purchased or sampled.

Status indicates the current lifecycle of the product. This can be one of 4 stages:

• Pre-Release: The model has not been released to general production, but samples may be available.
• Production: The model is currently being produced, and generally available for purchase and sampling.
• Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
• Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).

The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

This is the acceptable operating range of the device. The various ranges specified are as follows:

• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.

Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.