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Technical ArticlesThe Differential-signal Advantage for Communications System Design
Features and Benefits
- −3 dB bandwidth of 2.9 GHz (AV = 6 dB)
- Low supply current: 40 mA
- Pin-strappable gain adjust: 6 dB, 12 dB, 15.5 dB
- Differential or single-ended input to differential output
- Low noise input stage: 2.1 nV/√Hz RTI at AV = 12 dB
- Low broadband distortion (AV = 6 dB)
- 10 MHz: −94 dBc HD2, −87 dBc HD3
- 70 MHz: −98 dBc HD2, −87 dBc HD3
- 140 MHz: −95 dBc HD2, −87 dBc HD3
- 250 MHz: −80 dBc HD2, −73 dBc HD3
- IMD3s of −86 dBc at 250 MHz center
- Slew rate: 9.8 V/ns
- Fast settling of 2 ns and overdrive recovery of 3 ns
- Single-supply operation: 3 V to 3.6 V
- Power-down control
- Fabricated using the high speed XFCB3 SiGe process
The ADL5561 is a high performance differential amplifier optimized for RF and IF applications. The amplifier offers low noise of 2.1 nV/√Hz and excellent distortion performance over a wide frequency range, making it an ideal driver for high speed 8-bit to 16-bit analog-to-digital converters (ADCs).
The ADL5561 provides three gain levels of 6 dB, 12 dB, and 15.5 dB through a pin-strappable configuration. For the single-ended input configuration, the gains are reduced to 5.6 dB, 11.1 dB, and 14.1 dB. Using an external series input resistor expands the amplifier gain flexibility and allows for any gain selection from 0 dB to 15.5 dB.
The quiescent current of the ADL5561 is typically 40 mA and, when disabled, consumes less than 3 mA, offering excellent input-to-output isolation.
The device is optimized for wideband, low distortion performance. These attributes, together with its adjustable gain capability, make this device the amplifier of choice for general-purpose IF and broadband applications where low distortion, noise, and power are critical. This device is optimized for the best combination of slew speed, bandwidth, and broadband distortion. These attributes allow it to drive a wide variety of ADCs and make it ideally suited for driving mixers, pin diode attenuators, SAW filters, and multi-element discrete devices.
Fabricated on the Analog Devices, Inc., high speed SiGe process, the ADL5561 is supplied in a compact 3 mm × 3 mm, 16-lead LFCSP package and operates over the temperature range of −40°C to +85°C.
- Differential ADC drivers
- Single-ended-to-differential conversion
- RF/IF gain blocks
- SAW filter interfacing
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
ADL5561-EVALZ is a fully populated, 4-layer, FR4-based evaluation board designed to allow easy evaluation of all features of the ADL5561. The evaluation board integrates a prototype area for output impedance matching to the desired load and it requires only a single supply within the range of 3.0 V to 3.6 V.
Tools & Simulations
ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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.