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AD608:  Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem

The AD608 provides a low power, low distortion, low noise mixer as well as a complete, monolithic logarithmic/limiting amplifier that uses a successive-detection technique. In addition, the AD608 provides both a high speed received signal strength indicator (RSSI) output with 80 dB dynamic range and a hard-limited output. The RSSI output is from a two-pole postdemodulation low-pass filter and ...More

AD608:  Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem

Product Description

The AD608 provides a low power, low distortion, low noise mixer as well as a complete, monolithic logarithmic/limiting amplifier that uses a successive-detection technique. In addition, the AD608 provides both a high speed received signal strength indicator (RSSI) output with 80 dB dynamic range and a hard-limited output. The RSSI output is from a two-pole postdemodulation low-pass filter and provides a loadable output voltage of 0.2 V to 1.8 V. The AD608 operates from a single 2.7 V to 5.5 V supply at a typical power level of 21 mW at 3 V.

The RF and local oscillator (LO) bandwidths both exceed 500 MHz. In a typical IF application, the AD608 can accept the output of a 240 MHz surface acoustic wave (SAW) filter and down-convert it to a nominal 10.7 MHz IF with a conversion gain of 24 dB (ZIF = 165 Ω). The AD608 logarithmic/limiting amplifier section handles any IF from low frequency (LF) up to 30 MHz.

The mixer is a doubly balanced gilbert-cell mixer and operates linearly for RF inputs spanning −95 dBm to −15 dBm. It has a nominal −5 dBm third-order intercept. An on-board LO preamplifier requires only −16 dBm of LO drive. The current output of the mixer drives a reverse-terminated, industry-standard 10.7 MHz, 330 Ω filter.

The nominal logarithmic scaling is such that the output is +0.2 V for a sinusoidal input to the IF amplifier of −75 dBm and +1.8 V at an input of +5 dBm; over this range, the logarithmic conformance is typically ±1 dB. The logarithmic slope is proportional to the supply voltage. A feedback loop automatically nulls the input offset of the first stage down to the submicrovolt level.

The AD608 limiter output provides a hard-limited signal output at 400 mV p-p. The voltage gain of the limiting amplifier to this output is more than 100 dB. Transition times are 11 ns and the phase is stable to within ±3° at 10.7 MHz for signals from −75 dBm to +5 dBm.

The AD608 is enabled by a CMOS logic-level voltage input, with a response time of 200 ns. When disabled, the standby power is reduced to 300 μW within 400 ns.

The AD608 is specified for the industrial temperature range of −25°C to +85°C for 2.7 V to 5.5 V supplies and −40°C to +85°C for 3.0 V to 5.5 V supplies. This device comes in a 16-lead plastic SOIC.

RESOURCES & TOOLS

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  • Mixer
    −15 dBm, 1 dB compression point
    −5 dBm IP3
    24 dB conversion gain
    >500 MHz input bandwidth
  • Logarithmic/limiting amplifier
    80 dB RSSI range
    ±3° phase stability over 80 dB range
  • Low power
    21 mW at 3 V power consumption
    CMOS-compatible power-down to 300 μW typical
    200 ns enable/disable time

AD608 Functional Block Diagram

Similar Products

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Part# RF Frequency (MHZ) IF Frequency (MHz) LO Frequency (MHz) LO Drive (dBm) Conversion Gain (dB) IP3 (dBm) P1dB (dBm) NF (dB) Pos Supply Supply Current Price* (1000-4999)
AD831 400 200 400 0 0 24 10 14 +9V to +11V 100 $6.83
AD8342 LF to 2400 LF to 2400 LF to 2400 0 3 24 8.5 12 +4.75V to +5.25V 97 $3.59
AD8343 dc to 2500 dc to 2500 dc to 2500 -10 7 16.5 2.8 14 +4.5V to +5.5V 50 $3.67
AD8344 400 to 1200 70 to 400 470 to 1600 0 4.5 24 8.5 10 +4.75V to +5.25V 84 $3.59
ADL5350 LF to 4000 LF to 4000 LF to 4000 +4 - 25 19 6.5 +2.7V to +3V 19 $2.39
ADL5355 1200-2500 30 to 450 1230 to 2470 0 8.4 27 10.4 9.2 +3.3V to +5V 190 $6.98
ADL5356 1200-2500 30 to 450 1230 to 2470 0 8.2 31 11 9.9 +3.3V to +5V 350 $9.98
ADL5357 500-1700 30 to 450 730 to 1670 0 8.6 26.6 10.2 9.1 +3.3V to +5V 190 $6.98
ADL5358 700 to 1000 50 to 350 750 to 1450 0 8.5 26 10 9.5 +3.3V to +5V 380 $9.98
ADL5365 1200-2500 dc to 450 1300 to 2300 0 -7.3 36 25 7.3 +3.3V to +5V 120 $5.99
ADL5367 500-1700 dc to 450 700 to 1700 0 -7.7 34 25 7.3 +3.3V to +5V 100 $5.99
ADL5390 20 to 2400 230 20 to 2400 - 3.5 25 13 21 +4.75V to +5.25V 130 $7.59
ADL5391 dc to 2000 - - - 1 14 13.2 - +4.5V to +5.5V 135 $4.95
ADL5801 10 to 6000 LF to 600 25 to 6000 0 1.5 28 12.5 10 +4.5V to +5.5V 135 $5.15
ADL5802 100 to 6000 LF to 600 100 to 6000 0 1.5 27 12 11 +4.5V to +5.5V 200 $8.68
ADRF6601 300-2500 dc to 500 750 to1160 0 - 30 12 12 +4.75V to +5.25V 210 -
ADRF6602 1000-3100 dc to 500 1550 to 2150 0 - 29 12 12 +4.75V to +5.25V 210 -
ADRF6603 1100-3200 dc to 500 2100 to 2600 0 - 28 12 13 +4.75V to +5.25V 210 -
ADRF6604 1200-3600 dc to 500 2500 to 2900 0 - 27 12 14 +4.75V to +5.25V 210 -
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* 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.
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For detailed drawings and chemical composition please consult our  Package Site

Pin Count
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.

Temperature Range
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
Price
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.

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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.
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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.

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This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement page

*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.