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Technical content
Features
High-linearity, high-output power integrated amplifier with programmable gain control Attenuation range: 0 to 58 dB, adjustable in 2 dB increments by means of a 3-wire serial control 33 dB gain (at minimum attenuation) Low distortion products at output power levels up to +64 dBmV Low noise figure and output noise Frequency range: 5 to 85 MHz 5 V operation Materials set consistent with ROHS directives QFN (28-pin 5 mm x 5 mm x 1 mm) surface-mount package
Description
The ARA2017 is a highly linear, high output power, programmable gain amplifier optimized for DOCSIS 3.0 cable modem and E-MTA applications. Using a low-noise input amplification stage and an ultra-linear output driver amplifier, the device generates extremely low distortion products at the high output power levels required by DOCSIS 3.0 signals. The balanced circuit design of the device provides superior harmonic performance. An integrated digitally-controlled, multiple-stage precision step attenuator enables system solutions to meet DOCSIS power step accuracy requirements. The ARA2017 supports output power levels of +64 dBmV while minimizing harmonics, distortion, and output noise levels. Its precision attenuator provides up to 58 dB of attenuation in 2 dB increments, which is set by programming the register via a 3-wire serial interface. The output stage current, a feature which allows the device to be operated in reduced power modes for extended backup battery life, is also programmed through the 3-wire serial interface. The ARA2017 is offered in a 28-pin 5 mm x 5 mm x 1 mm QFN package. A functional block diagram of the ARA2017 is shown in Figure 1. The device package and pinout are shown in Figure 2. Signal pin assignments and functional pin descriptions are described in Table 1.
Table 1. ARA2017 Signal Pin Descriptions
1 A1 IN+ Amplifier A1 (+) input 15 N/C No connection
2 GND Ground 16 ATTN OUT- Attenuator output (-)
3 A1 IN- Amplifier A1 (-) input 17 A2 IN- Amplifier A2 (-) input
4 GND Ground 18 GND Ground
5 A1 OUT- Amplifier A1 (-) output and supply 19 A2 OUT- Amplifier A2 (-) output and supply
6 ATTN IN- Attenuator input (-) 20 GND Ground
7 N/C No connection 21 A2 OUT+ Amplifier A2 (+) output and supply
8 GND Ground 22 A2 IN+ Amplifier A2 (+) input
9 CLOCK Clock 23 ATTN OUT+ Attenuator output (+)
10 DATA Data 24 GND Ground
11 ENBL Enable 25 V ATTN Attenuator supply
12 N/C No connection (reserved for future use -
26 GND Ground
13 TX_EN Transmit enable 27 ATTN IN+ Attenuator input (+)
14 V DD Supply 28 A1 OUT+ Amplifier A1 (+) output and supply
Table 2. Recommended operating conditions are specified in performance characteristics are shown in Figures 3 through 16. Table 2. ARA2017 Absolute Maximum Ratings1 or below their nominal value. Exceed ing any of the limits listed here may result in permanent damage to the device. ESD HANDLING: Although this device is designed to be as robust as possible, electrostatic discharge (ESD) can damage this device. potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD handling precautions should be used at all times. Table 3. ARA2017 Recommended Operating Conditions1 1 Performance is guaranteed only under the conditions listed in this table. Table 4. ARA2017 Digital Interface Specifications 1 Logic control levels apply to the 3-wire programming bus (pins 9, 10, 11) and the transmit enable control (pin 13).
Table 5. ARA2017 Electrical Specifications Active / no signal / min. atten. set. Active / no signal / max. atten. set. 1 As measured in test fixture. 2 Measured using the maximum current setting. See the Application Information section.
lists the Evaluation Board Bill of Materials (BOM). Figure 17. ARA2017 Evaluation Board Schematic
Table 6. ARA2017 Evaluation Board Bill of Materials (BOM)
significant bit (MSB) first and the least significant bit (LSB) last. each data value into the register. Table 7. Programming Register 1 Refer to Application Information sect ion for Current and Gain bit settings. 2 Data bit 0 should always be set to 1. Figure 18. Serial Data Input Timing
DATA SHEET • ARA2017: PROGRAMMABLE GAIN AMPLIFIER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 12 June 7, 2019 • Skyworks Prop rietary Information • Products and Product Information are Subject to Change Without Notice • 204229C
Application Information
The ARA2017 can be switched on (TX enable) and off (TX disable) via an asynchronous input TX_EN (pin 13). A logic high will turn the amplifier on. The gain and current settings are retained during Tx disable and do not need to be reloaded. Gain/Attenuator Setting The gain of the ARA2017 can be controlled via the 3-wire bus. Data bits D2 through D6 set the gain/ attenuator level, with 00000 being the min gain setting, and 11111 being the max gain setting. A new gain/ attenuator setting can be loaded while the PGA is on X enable), but will not take effect until TX_EN has been cycled off /on. Output Stage Current Setting The ARA2017 consists of two gain stages. The input stage operates at a constant fixed current when TX is enabled. The current in the output stage can be controlled via the 3-wire bus. Data bits D7 to D9 set the current. A setting of 111 will set the output stage to maximum current for maximum linearity. The current can be lowered for improved efficiency at lower output power levels, or lower linearity requirements. 000 will turn both stages off, the same as T X disable. A new current setting can be loaded while the PGA is on (TX Enable), but will not take effect until TX_EN has been cycled off /on. Output Transformer Matching the balanced output of the ARA2017 to a single-ended 75 Ω load is accomplished using a 1:1 turns ratio transformer. In addition to the balanced to single-ended conversion, this transformer provides the bias to the output amplifier stage via the center tap. The transformer also cancels even mode distortion products and common mode signals, such as the voltage transients that occur while enabling and disabling the amplifiers. As a result, care must be taken when selecting the transformer to be used at the output. It must be capable of handling the RF and DC power requirements without saturating the core, and it must have adequate isolation and good phase and amplitude balance. It also must operate over the desired frequency and temperature range for the intended application.
footprint is shown in Figure 21. moisture after the container seal is broken must be followed. done manually or in a production solder reflow environment. Figure 19. ARA2017 Package Dimensions
DATA SHEET • ARA2017: PROGRAMMABLE GAIN AMPLIFIER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 204209F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 7, 2019 15
Ordering Information
Part Number Product Description Component Packaging ARA2017RS29P8 28 Pin QFN Package 5 mm x 5 mm x 1 mm 2500-piece tape and reel Copyright © 2019 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks and the Skyworks symbol are trademarks or registered trademarks of Skyworks Solutions, Inc. or its subsidiaries in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.