ARA2017 Programmable Gain Amplifier PRELIMINARY DATA SHEET - rev 1.0 features • High Linearity, High Output Power Integrated Amplifier with Programmable Gain Control • Attenuation Range: 0-58 dB, Adjustable in 2 dB Increments via 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: 5-85 MHz • 5 V Operation • Materials set consistent with RoHS Directors. Surface Mount Package Applications S29 Package 28-Pin QFN 5 mm x 5 mm x 1 mm • DOCSIS 3.0 Data Cable Modems and E-MTAs • CATV Set Top Boxes PRODUCT 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. Its balanced circuit design provides superior harmonic performance and 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 harmonic, distortion, and output noise levels. Its precision attenuator provides up to 58 dB of attenuation in 2 dB increments. The attenuator setting is programmed via a 3-wire serial interface, as is the output stage current, a feature which allows the device to be operated in reduced power modes for extended backup battery life in E-MTA applications. The ARA2017 is offered in a 28pin 5 mm x 5 mm x 1 mm QFN package. Figure 1: Functional Block Diagram 07/2008 ARA2017 Figure 2: Pinout (X-Ray Top View) Table 1: Pin Description 2 PIN NAME Amplifier A1 (+) Input 28 A1OUT+ Amplifier A1 (+) Output and Supply GND Ground 27 ATTNIN+ Attentuator Input (+) 3 A1IN- Amplifier A1 (-) Input 26 GND Ground 4 GND Ground 25 VATTN Attenuator Supply 5 A1OUT- Amplifier A1 (-) Output and Supply 24 GND Ground 6 ATTNIN- Attentuator Input (-) 23 7 N/C No Connection 22 A2IN+ 8 GND Ground 21 A2OUT+ 9 CLOCK Clock 20 GND Ground 10 DATA Data 19 A2OUT- Amplifier A2 (-) Output and Supply 11 ENBL Enable 18 GND Ground 12 N/C No Connection (Reserved for future use - leave floating) 17 A2IN- Amplifier A2 (-) Input 13 TX_EN Transmit Enable 16 14 VDD Supply 15 PIN NAME 1 A1IN+ 2 DEScRIPTIoN DEScRIPTIoN ATTNOUT+ Attentuator Output (+) Amplifier A2 (+) Input Amplifier A2 (+) Output and Supply ATTNOUT- Attentuator Output (-) N/C PRELIMINARY DATA SHEET - Rev 1.0 07/2008 No Connection ARA2017 ELECTRICAL CHARACTERISTICS Table 2: Absolute Minimum and Maximum Ratings PARAMETER MIN MAX uNIT coMMENTS Supply: VDD (pins 5, 14, 19, 21, 28), VATTN (pin 25) 0 +6 V RF Power at Inputs (pins 1, 3) - +40 dBmV Digital Interface (pins 9, 10, 11, 13) -0.5 VDD+0.5 V Storage Temperature -55 +150 °C differential into 200 V Stresses in excess of the absolute ratings may cause permanent damage. Functional operation is not implied under these conditions. Exposure to absolute ratings for extended periods of time may adversely affect reliability. Table 3: Operating Ranges PARAMETER MIN TYP MAX uNIT 5 - 85 MHz Supply: VDD (pins 5, 14, 19, 21, 28) +4.5 +5 +5.5 V Digital Interface (pins 9, 10, 11, 13) 0 - VDD V -20 +25 +85 °C Operating Frequency (f) Case Temperature (TC) The device may be operated safely over these conditions; however, parametric performance is guaranteed only over the conditions defined in the electrical specifications. Table 4: Digital Interface Specifications (VDD = +5.0 V) PARAMETER MIN TYP MAX uNIT Logic High Input Voltage: VIN,HIGH +2.0 - VDD V Logic Low Input Voltage: VIN,LOW 0 - +0.8 V Note: 1. Logic control levels apply to the 3-wire programming bus (pins 9, 10, 11) and the transmit enable control (pin 13). PRELIMINARY DATA SHEET - Rev 1.0 07/2008 3 ARA2017 Table 5: Electrical Specifications VDD = +5.0 V, TX Enabled, (unless otherwise noted) PARAMETER MIN TYP MAX uNIT 34 36 37 dB 0 dB attenuation setting Gain Flatness - 0.5 1.0 - dB 5 to 42 MHz 5 to 85 MHz Gain Variation over Temperature - -0.02 - dB/°C Gain Range with Attenuator 58 - - dB Incremental Attenuator Step Size 1.5 2 2.5 dB 2nd Harmonic Distortion Level (2) - -67 -55 dBc +64 dBmV into 75 V 3rd Harmonic Distortion Level (2) - -72 -55 dBc +64 dBmV into 75 V +88 +93 - dBmV 1 dB Gain Compression (2) - +73 - dBmV Noise Figure - 2.5 - dB Output Noise Power Active / No Signal / Min. Atten. Set. Active / No Signal / Max. Atten. Set. - -38.5 -53.8 - dBmV Isolation (85 MHz) in Tx disable mode - 60 - dB Differential Input Impedance - 200 - V between pins 1 and 3 (Tx enabled) Differential Output Impedance - 75 - V between pins 19 and 21 Output Impedance - 75 - V with transformer Output Return Loss (75 Ohm characteristic impedance) - -15 -12 - dB Tx enabled Tx disabled Output Voltage Transient Tx enable / Tx disable - 50 7 - mVp-p Total Supply Current (2) (pins 5, 14, 19, 21, 25, 28) - 340 10.5 400 - mA Tx enabled (TX_EN high) Tx disabled (TX_EN low) Total Power Consumption - 1.7 52.5 - W mW Tx enabled (TX_EN high) Tx disabled (TX_EN low) Gain 3rd Order Output Intercept (2) Notes: 1. As measured in ANADIGICS test fixture. (2) Measured using the maximum current setting-see Application Information section. 4 PRELIMINARY DATA SHEET - Rev 1.0 07/2008 coMMENTS 2 tone, +61 dBmV/tone Full gain @ 0 dB attenuator setting; Includes input balun loss Any 160 kHz bandwidth from 5 to 85 MHz 0 dB attenuator setting 24 dB attenuator setting DATA PLOTS o VDD = 36 ARA2017 figure ?: Gain vs frequency over Voltage ( Tc = 25 c ) Figure 3: Gain vs Frequency over Voltage (TC = 25 8C) +5V +5.25V +5.5V +4.75V +4.5V Gain (dB) 35.5 35 34.5 34 33.5 33 0 20 40 60 80 100 120 frequency (Mhz) figure ?: Gain vs Temperature ( VDc =4:+5V, 10MHz ) Figure Gainf1 vs=Temperature (VDC = +5V, F1 = 10 MHz) Gain(dB) NF dB 7 35 6 34 5 33 4 32 3 31 2 30 0 20 40 60 80 100 Nf(dB) Gain dB 36 1 120 o Temperature(case) c PRELIMINARY DATA SHEET - Rev 1.0 07/2008 5 ARA2017 figure ?: Nf vs frequency over Voltage Figure 5: NF vs Frequency over Voltage VDD = 4 +5V +5.25V +5.5V +4.75V +4.5V Nf(dB) 3.5 3 2.5 2 o Tc = +25 c 1.5 0 20 40 60 80 100 120 frequency (Mhz) figure ?: output Power at 1dB Gain compression (P1dB) vs. case Temperature Figure 6: Output Power at 1dB Gain Compres( VDD = +5V, f1 = 10MHz ) sion (P1dB) vs. Case Temperature (VDD = +5V, F1 = 10MHz) 77 76.5 P1dB(dBmV) 76 75.5 75 74.5 74 73.5 73 0 20 40 60 80 o case Temperature ( c) 6 PRELIMINARY DATA SHEET - Rev 1.0 07/2008 100 120 ARA2017 figure ?: output Power at 1dB Gain compression (P1dB) vs Voltage Figure 7: Output Power at 1dB Gain Compreso vs = Voltage (sion Tc =(P1dB) 25 c, f1 10MHz ) (TC = 25 8C, F1 = 10MHz) 77 76.5 P1dB (dBmV) 76 75.5 75 74.5 74 73.5 73 4.4 4.6 4.8 5 5.2 5.4 (Vdc) figure ?: output Third Voltage order Intercept Point (oIP3) 5.6 vs. case Temperature Figure 8: Output Third Order Intercept Point (OIP3) vs. Case Temperature 95 94 93 oIP3(dBmV) 92 91 90 89 88 Vdd = +5Vdc f1 = 10mHz, f2 = 11mHz 87 86 85 0 20 40 60 80 100 120 o case Temperature( c) PRELIMINARY DATA SHEET - Rev 1.0 07/2008 7 ARA2017 figure Figure ?: output Third order Intercept Point (oIP3) 9: Output Third Order Intercept Point vsvsVoltage (OIP3) Voltage 92 91 90 oIP3 (dBmV) 89 88 87 86 85 o Tcase = +25 c f1 = 10mHz, f2 = 11mHz 84 83 82 4.4 4.6 4.8 5 5.2 5.4 5.6 Voltage (Vdc) figure ?: Attenuator Accuracy over frequency o Figure 10: Attenuator over= Frequency Tc =Accuracy 25 c, Vdc +5V (TC = 25 8C, VDC = +5V) Measured Attenuation (dB) 35 ATTENUATOR SETTING = 2dB 4dB 8dB 16dB 32dB 30 25 20 15 10 5 0 10 20 30 40 50 60 frequency (MHz) 8 PRELIMINARY DATA SHEET - Rev 1.0 07/2008 70 80 90 100 ARA2017 figure ?: Attenuator accuracy over Voltage o ( Tc = +25Accuracy c, f1 =over 10mHz ) Figure 11:Attenuator Voltage (TC = +25 8C, F1 = 10MHz) Measured Attenuation(dB) 35 ATTENUATOR SETTING = 2dB 4dB 8dB 4.9 5 16dB 32dB 30 25 20 15 10 5 0 4.5 4.6 4.7 4.8 5.1 5.2 5.3 5.4 5.5 Supply Voltage, Vdd (Vdc) figure ?: Attenuator Accuracy over Temperature Measured Attenuation(dB) 35 Figure 12: Attenuator Temperature ( Vdc = Accuracy +5V, f1 =over 10mHz ) (VDC = +5V, F1 = 10MHz) ATTENUATOR SETTING = 2dB 4dB 8dB 16dB 32dB 30 25 20 15 10 5 0 25 35 45 55 65 o 75 85 95 case Temperature ( c) PRELIMINARY DATA SHEET - Rev 1.0 07/2008 9 ARA2017 (2) Figure 13: Test Circuit NOTES: 1. Pin 12 is reserved for future use. Do not connect (leave floating). (2) Input balun is used for evaluation test purposes only in 75 V system. Actual application does not require a 4:1 balun on the input. 10 PRELIMINARY DATA SHEET - Rev 1.0 07/2008 ARA2017 LOGIC PROGRAMMING Programming Instructions The programming word is set through a 10 bit shift register via the data, clock and enable lines. The data is entered in order with the most significant bit (MSB) first and the least significant bit (LSB) last. The enable line must be low for the duration of the data entry, then set high to latch the shift register. The rising edge of the clock pulse shifts each data value into the register. Table 6: Programming Register DATA BIT fuNcTIoN 9 8 7 Current 6 5 4 Gain 3 2 1 0 0 1 Notes: 1. Refer to Application Information section for Current and Gain bit settings. 2. Data bit 0 should always be set to “1”. 3. Data bit 1 is reserved for future use, and should be set to “0”. Figure 14: Serial Data Input Timing PRELIMINARY DATA SHEET - Rev 1.0 07/2008 11 ARA2017 APPLICATION INFORMATION Transmit Enable / Disable Output Transformer Gain/Attenuator Setting 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. 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. 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 (TX enable), but will not take effect until TX_EN has been cycled off /on. Output Stage Current Setting The ARA2017 consists of 2 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 – D9 set the current. 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 TX 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. 12 Matching the balanced output of the ARA2017 to a single-ended 75 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. PRELIMINARY DATA SHEET - Rev 1.0 07/2008 ARA2017 PACKAGE OUTLINE Figure 15: S29 Package Outline - 28 Pin 5 mm x 5 mm x 1 mm QFN PRELIMINARY DATA SHEET - Rev 1.0 07/2008 13 ARA2017 Figure 16: Land Pattern 14 PRELIMINARY DATA SHEET - Rev 1.0 07/2008 ARA2017 ORDERING INFORMATION oRDER NuMBER TEMPERATuRE RANGE PAcKAGE DEScRIPTIoN coMPoNENT PAcKAGING ARA2017RS29P8 -20 oC to +85 oC 28 Pin QFN Package 5 mm x 5 mm x 1 mm Tape and Reel, 2500 pieces per Reel ANADIGICS, Inc. 141 Mount Bethel Road Warren, New Jersey 07059, U.S.A. Tel: +1 (908) 668-5000 Fax: +1 (908) 668-5132 URL: http://www.anadigics.com E-mail: [email protected] IMPORTANT NOTICE ANADIGICS, Inc. reserves the right to make changes to its products or to discontinue any product at any time without notice. The product specifications contained in Advanced Product Information sheets and Preliminary Data Sheets are subject to change prior to a product’s formal introduction. Information in Data Sheets have been carefully checked and are assumed to be reliable; however, ANADIGICS assumes no responsibilities for inaccuracies. ANADIGICS strongly urges customers to verify that the information they are using is current before placing orders. warning ANADIGICS products are not intended for use in life support appliances, devices or systems. Use of an ANADIGICS product in any such application without written consent is prohibited. 15 PRELIMINARY DATA SHEET - Rev 1.0 07/2008