ARA2001S23 CATV Reverse Amplifier with Step Attenuator Advanced Product Information - Rev. 2 FEATURES · · · · Low cost integrated monolithic GaAs amplifier with step attenuator. Attenuation Range: 0 58 dB, variable in 1 dB steps via 8 bit serial input. Meets DOCSIS distortion requirements at +60 dBmV Low distortion & Low noise figure Frequency range: 5 100 MHz 5 Volt operation · · · · APPLICATIONS MCNS/DOCSIS Compliant Cable Modems CATV Interactive Set-Top Box Telephony over Cable Systems Open Cable Set-Top Box · · S23 28 PIN SSOP PACKAGE Description The ARA2001S23 is a GaAs IC designed to provide the reverse path amplification and output level control functions in a CATV Set-Top Box or Cable Modem. It incorporates a digitally controlled precision step attenuator that is preceded by an ultra low noise amplifier stage, and followed by an ultra-linear output driver amplifier. This part is a balanced design that meets or exceeds the MCNS/DOCSIS requirement for harmonic performance @ +60dBmV output levels while only requiring a single polarity +5V supply. Both the input and output are matched to 75 ohms. The precision attenuator provides up to 58 dB of attenuation in 1 dB increments. The ARA2001S23 is supplied in a 28-pin SSOP package featuring a thermal heat slug on the bottom of the package. Soldering this heat slug to the ground plane of the PC board ensures the lowest possible thermal resistance for the device resulting in a long MTF. Tx Enable/Disable EN CLK "Shutdown" DAT Gain Control CMOS IC PA PA ATTN 1/2/4/8/16/32 dB ~ PA ~ Clock PA ARA2001 Reverse Amp Low Pass Filter Balun Upstream QPSK/ 16-QAM Modulator Low Pass Filter Data Clock RAM Microcontroller w/Enet MAC MAC "Shutdown" ROM Data 45 MHz IF Diplexer Filter 54-860 MHz Double Conversion Tuner SAW QAM Receiver w/FEC 10Base-T Tranceiver RJ45 Connector Coax Input Figure 1: Cable Modem or Interactive Set-Top Box Block Diagram ARA2001S23 GaAs IC Attn In Attn Out Amp Out Amp In Amp In ISET 1 32 dB 16 dB 8 dB 4 dB 2 dB Amp Out 1 dB ISET 2 EFET EFET Control 1 Control 2 Amp In Amp Out Amp Out Amp In Attn In Attn Out 32 dB 16 dB 8 dB 4 dB 2 dB 1 dB P5 P4 P3 P2 P1 P0 Buffer Clock Data 8 8-Bit Shift Register Control Latch Enable CMOS IC (Serial to Parallel Interface) Figure 2: ARA 2001 Block Diagram ABSOLUTE MAXIMUM RATINGS PARAMETER V DD (P INS 2,4,9,21,24) V RFIN (P INS 5,8) ATTIN (3,10) ATTOUT (19,26)V ISET (P INS 7, 22) RF Input Voltage (P INS 5,8)* Storage Temperature S olderi ng Temperature S olderi ng Ti me Operati ng C ase Temperature 2 PARAMETER 9 VD C 0 to -3 VD C 5 VD C 2 VD C + 60 dB mV - 55 to +200 °C 260 °C 5 S ec 0 to + 85 °C ARA2001S23 ELECTRICAL CHARACTERISTICS (TYPICAL) (VDD=5 VDC, TC=25 °C) PAR AMETER MIN TYP MAX U N IT Gai n 1 @ 10 MHz 27.5 29.3 30.5 dB At 0dB attenuati on setti ng - 0.75 - dB 5 to 42 MHz - -0.006 - dB/°c 0.65 1.6 3.6 7.5 15.0 30.2 0.83 1.70 3.75 7.75 15.40 30.75 1.00 2.05 4.0 8.0 15.8 31.3 dB Gai n Flatness 1 Gai n Vari ati on Over Temp Attenuati on Steps 1 1 dB 2 dB 4 dB 8 dB 16 dB 32 dB C OMMEN TS 2nd Harmoni c D i storti on Level 2 10 MHz - -75 -53 dB c at +60 dBmV 3rd Harmoni c D i storti on Level 2 10 MHz - -60 -53 dB c at +60 dBmV 3rd Order Output Intercept Poi nt 78 - - dBmV 1 dB Gai n C ompressi on Poi nt - 68.5 - dBmV Noi se Fi gure1 - 3.0 4.0 dB Includes i nput balun loss Ouput Noi se Power Acti ve/No Si gnal/Mi n Attn. Setti ng Acti ve/No Si gnal/Max Attn. Setti ng - - -25.5 -40.8 dBmV Any 3200 KHz bandwi dth from 5-42 MHz Isolati on i n Tx di sable mode @ 45 MHz - 65 - dB D i fference i n output si gnal level between Tx enable / di sable Input Impedance1 - 75 - ohm Input Return Loss1 - -20 -12 dB Tx enabled Input Return Loss 1 - -5 - dB Tx di sabled Output Impedance1 - 75 - ohm Output Return Loss1 - -17 -12 dB Tx enabled Output Return Loss1 - -15 -10 dB Tx di sabled VDD1, VDD2 (Pi ns 4, 9, 21, 24) - 5 7 V VDD D i gi tal (Pi n 2) - 5 - V VDD C MOS (Pi n 11) 3 - 5 V I DD1 (Input Amp) (Pi ns 4 and 9) - 48 80 mA Tx enabled 3 ARA2001S23 ELECTRICAL CHARACTERISTICS (TYPICAL) (VDD=5 VDC, TC=25 °C) (Continued) PAR AMETER MIN TYP MAX U N IT I DD1 - 2.4 6 mA Tx di sabled I DD2 (Output Amp) (Pi ns 21 and 24) - 77 120 mA Tx enabled I DD2 - 3.7 9 mA Tx di sabled I DD D i gi tal (Attenuator) (Pi n 2) - 9 15 mA Power C onsumpti on - 0.67 1.08 W Tx enabled Power C onsumpti on - 75 150 mW Tx di sabled Attenuator Step Si ze 0.6 - 1.4 dB - 1.5 - dB - 4 100 7 mVp-p - 58.6 60.3 Gai n Flatness 1 Output Voltage Transi ent 1 Tx enable/di sable Maxi mum Attenuati on C OMMEN TS 5 - 65 MHz At 0 db Attenuator Setti ng At 24 db Attenuator Setti ng Notes: 1. As measured in ANADIGICS test fixture 2. At +60 dBmV output level into 75 ohm load Attenuation Level vs Control Word 64 60 56 52 48 Attenuation (dB) 44 40 36 32 28 24 20 16 12 8 4 0 0 4 8 12 16 20 24 28 32 Control Word 4 36 40 44 48 52 56 ARA2001S23 8 30 7 25 6 20 5 15 4 10 3 5 NF (dB) Gain (dB) Gain & Noise Figure vs Frequency 35 2 10 20 Gain 30 40 50 Noise Figure 60 70 80 90 100 Frequency (MHz) 6 32 5 29 4 26 3 23 2 NF (dB) GAIN (dB) Gain & Noise Figure vs VDD 35 Measured @ 30 MHz 20 1 3 Gain 4 Noise Figure 5 6 7 VDD ( Volts ) 6 32 5 29 4 26 3 23 2 NF (dB) GAIN (dB) G AIN & Noise Figure vs Tem perature 35 Measured @ 30 MHz 20 1 -40 -25 Gain -10 N oise Figure 5 20 35 50 65 80 o Tem perature (C ) 5 ARA2001S23 Harmonic Distortion vs VDD Pout = 58 dBmV -20 Harmonic Level (dBc) -30 -40 -50 -60 -70 Measured @ 5 MHz -80 3 4 2nd Harmonic 5 6 7 VDD ( Volts ) 3rd Harmonic Harmonic Distortion vs VDD Pout = 58 dBmV -20 Harmonic Level (dBc) -30 -40 -50 -60 -70 Measured @ 12 MHz -80 3 4 2nd Harmonic 5 3rd Harmonic 6 7 VDD ( Volts ) Harmonic Distortion vs Temperature Pout = 58 dBmV -40 -45 Harmonic level (dBc) -50 -55 -60 -65 -70 -75 Measured @ 5 MHz -80 -40 -25 2nd Harmonic -10 5 20 35 3rd Harmonic o Temperature (C ) 6 50 65 80 ARA2001S23 Harmonic Distortion vs Power Out -30 -35 Harmonics (dBc) -40 -45 -50 -55 -60 -65 -70 -75 49 51 2nd 53 55 3rd 57 59 61 63 65 67 Pout (dBmV) Measured @ 10 MHz Transients vs Attenuation Pout = 55 dBmV at 0dB attenuation. 100 90 80 Transient (mV) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Power Attenuation (dB) DOCSIS 1.1 Spec. ARA2001 7 ARA2001S23 Harmonic Performance vs Frequency Pout = +62 dBmV -50 -52 Harmonic Level (dBc) -54 -56 -58 -60 -62 -64 -66 -68 -70 -72 5 10 15 20 25 30 35 Frequency (MHz) 2nd Harmonic 3rd Harmonic 40 14 36 12 32 10 28 8 24 IIP3 (dBm) IIP2 (dBm) IIP2 & IIP3 vs Frequency 6 Measured @ VDD = 5 Volts Pin = -20 dBm per tone 20 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 4 100 Frequency (MHz) IIP2 IIP3 40 15 36 11 32 7 28 3 24 -1 Measured @ 65 MHz Two tones @ 29.5 MHz & 35.5 MHz Pin = -20 dBm per tone 20 -5 3 4 5 6 VDD (Volts) IIP2 8 IIP3 7 IIP3 (dBm) IIP2 (dBm) IIP2 & IIP3 vs VDD ARA2000 & 2001 Balanced Reverse Amp Test Fixture with 3 Wire Interface +5V (Vdd2) +5V (Vdd1 & Vattn) 1uF 1uF 2 1000pF 1200 ohms 4 5 RF Input (75 ohm) 6 3.9 ohms 7 8 9 1200 ohms 10 1000pF 1000pF 470pF 11 13 In A2 + Out A2 + In A1 + Vg2 Vg1 SB2 SB1 Out A2 - In A1 Out A1 - In A2 - Attn In - Attn Out Gnd CMOS Vdd CMOS Clock nc Data nc Enable nc 1uF +5V (Vdd1) DATA 0.1uF Control A1 0 / +3 V Out A1 + 26 470pF 25 2:1 24 1500pF R 23 22 21 20 Toko Balun P/N 616PT-1030 19 18 17 16 15 470pF 470pF 2K ohms 14 0.1uF 2K ohms 1K ohm 10uH Attn Out + CLOCK 2K ohms 12 27 Attn In + ENABLE Toko Balun P/N 616PT-1030 28 1K ohm 1uF 1:2 3 Vattn TEST CIRCUIT 1000pF gnd gnd 0.1uF 2K ohms 1 10uH Vdd CMOS 0.1uF Control A2 0 / +3 V Note: Tx Enable = Control Tx Disable = Control 1 ARA2001S23 9 ARA2001S23 Programming Word D0 D1 D2 D3 D4 D5 D6 D7 P0 P1 P2 P3 P4 P5 P6 P7 Data Port Description SERIAL DATA FUNCTION P0 1 dB Attenuator Bit P1 2 dB Attenuator Bit P2 4 dB Attenuator Bit P3 8 dB Attenuator Bit P4 16 dB Attenuator Bit P5 32 dB Attenuator Bit P6 N/A P7 N/A Figure 3 SERIAL DATA INPUT TIMING DATA D7: MSB D6 D5 CLOCK ENABLE OR ENABLE Figure 4 10 D4 D1 D0: LSB ARA2001S23 PIN DESCRIPTION Pin Function 1 Ground 2 VATTN 3 ATTIN (+) Attenuator Input (+) 4 A1 Ampli fi er 1 (+) Output (+) OUT D escription Supply for Attenuator 5 A 1IN (+) 6 V g1 Ampli fi er A1 (+/-) C ontrol 7 ISET1 Ampli fi er A1 (+/-) C urrent Adjust 8 A 1IN (-) 9 A 1OUT (-) Ampli fi er A1 (-) Output 10 ATTIN (-) Attenuator Input (-) 11 C MOS Supply For D i gi tal C MOS C i rcui t 12 C LK C lock 13 D AT D ata 14 En Enable 15 N/C No C onnecti on 16 N/C No C onnecti on 17 N/C No connecti on 18 C MOS 19 ATTOUT (-) Attenuator Output (-) 20 A 2IN (-) Ampli fi er A2 (-) Input 21 A 2OUT (-) 22 ISET2 Ampli fi er A2 (+/-) C urrent Adjust 23 V g2 Ampli fi er A2 (+/-) C ontrol 24 25 A2 OUT A2 IN (+) (+) Ampli fi er 1 (+) Input Ampli fi er A1 (-) Input Ground for D i gi tal C MOS C i rcui t Ampli fi er A2 (-) Output Ampli fi er A2 (+) Output Ampli fi er A2 (+) Input 26 ATTOUT (+) 27 N/C No C onnecti on 28 GND Ground Attenuator Output (+) 11 ARA2001S23 Package Outline θ SYMBOLS A A1 A2 b C D E H e L y θ T S 12 DIMENSIONS IN INCHES MIN 0.057 0.000 0.057 0.008 0.007 0.386 0.150 0.228 0.025 0.016 −−− 0° −−− −−− DIMENSIONS IN MILLIMETERS MAX 0.061 0.004 MIN 1.45 0.00 0.012 0.010 0.394 0.157 0.244 0.20 0.18 9.80 3.81 5.80 0.050 0.004 8° 0.190 0.096 0.40 −−− 0° −−− −−− 1.45 .64 MAX 1.55 0.10 0.30 0.25 10.00 4.00 6.20 1.27 0.10 8° 4.82 2.43 NOTE 1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH AND GATE BURRS 2. TOLERANCE 0.004in.[0.10 mm] UNLESS OTHERWISE SPECIFIED 3. CONTROLLING DIMENSION ARE INCHES. 4. REF. - MO-137 ARA2001S23 NOTES 13 ARA2001S23 NOTES 14 ARA2001S23 NOTES 15 ARA2001S23 ANADIGICS, Inc. 35 Technology Drive Warren, New Jersey 07059 Tel: (908) 668-5000 Fax: (908) 668-5132 http://www.anadigics.com [email protected] IMPORTANT NOTICE ANADIGICS, Inc. reserves the right to make changes to its products or discontinue any product at any time without notice. The Advanced Product data sheets and product specifications contained in this data sheet are subject to change prior to a products formal introduction. The information in this data sheet has been carefully checked and is assumed to be reliable. However, ANADIGICS assumes no responsibility 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. 16