ARA1400 ANADIGICS | Alldatasheet

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Technical content

Reverse Amplifier with Step Attenuator Data Sheet - Rev 2.1

FEATURES

  • Low cost integrated monolothic GaAs amplifier with step attenuator
  • Attenuation Range: 0-56 dB, adjustable in 4 dB increments via a 4 wire parallel control
  • Meets DOCSIS distortion requirements at +60 dBmV output signal level
  • Low distortion and low noise
  • Frequency range: 5-100 MHz
  • 5 Volt operation
  • 0 to +85 °C temperature range

APPLICATIONS

  • MCNS/DOCSIS Compliant Cable Modems
  • CATV Interactive Set-Top Box
  • Telephony over Cable Systems
  • OpenCable Set-Top Box
  • Residential Gateway The ARA1400 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. The device is capable of meeting the MCNS/DOCSIS requirements for harmonic performance at a +60dBmV output level while requiring only a single polarity +5V supply. Both the input and the output are single-ended and matched to 75 Ohms, and a precision attenuator provides up to 56 dB of attenuation in 4 dB increments. The device is offered in a 28-pin SSOP package featuring a heat slug on the bottom of the package. Figure 1: Cable Modem or Set Top Box Application Diagram

28 Pin SSOP with Heat Slug

44 MHz

Data Sheet - Rev 2.1 ARA1400 Table 1: Pin Description Notes: (1) All N/C pins should be grounded. (2) Pins should be AC-coupled. No external DC bias should be applied. (3) Pins should be AC-grounded. No external DC bias should be applied. (4) Pins should be AC-coupled from the RF path, and should be pulled to ground through a resistor. NIP EMAN NOITPIRCSED NIP EMAN NOITPIRCSED 1D NGd nuorG5 1B d8t iBlortnoCnoitunettABd28 2C /Nn oitcennoCoN )1( 61B d4t iBlortnoCnoitunettABd4 3T TA NI tupnIrotaunettA )2( 71V 2A ylppuS2AreifilpmA 4F R 1TUO dnatuptuO1AreifilpmA ylppuS 81V 2FER rofegatloVecnerefeR 2AreifilpmA 5V 1FER rofegatloVecnerefeR 1AreifilpmA 91F R TUO hctiwSmorftuptuOFR )2( 6T TA 1GCA 1dnuorGCArotaunettA )3( 02T TA 2GCA 2dnuorGCArotaunettA )3( 7T TA 1GCA 1dnuorGCArotaunettA )3( 12T TA 2GCA 2dnuorGCArotaunettA )3( 8T TA 1GCA 1dnuorGCArotaunettA )3( 22T TA 2GCA 2dnuorGCArotaunettA )3( 9T TA 1GCA 1dnuorGCArotaunettA )3( 32T TA 2GCA 2dnuorGCArotaunettA )3( 01F R NI tupnI1AreifilpmA )4( 42T TA 3GCA 3dnuorGCArotaunettA )3( 11I 1TES tsujdAtnerruC1AreifilpmA5 2x Tl ortnoChctiwStuptuO 21V TTA ylppuSrotaunettA6 2F R 2NI tupnI2AreifilpmA )4( 31B d23t iBlortnoCnoitunettABd237 2I 2TES tsujdAtnerruC2AreifilpmA 41B d61t iBlortnoCnoitunettABd618 2T TA TUO tuptuOrotaunettA )2(

4 Data Sheet - Rev 2.1 ARA1400

ELECTRICAL CHARACTERISTICS

Table 2: Absolute Minimum and Maximum Ratings 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. Notes: 1. Pins 3, 19, and 28 should be AC-coupled. No external DC bias should be applied. 2. Pins 11 and 27 should be grounded or pulled to ground through a resistor. No external DC bias should be applied. 3. Pins 6, 7, 8, 9, 20, 21, 22, 23 and 24 should be AC-grounded. No external DC bias should be applied. 4. Pins 10 and 26 should be AC-coupled from the RF path, and should be pulled to ground through a resistor. Table 3: Operating Ranges The device may be operated safely over these conditions; however, parametric performance is guaranteed only over the conditions defined in the electrical specifications. RETEMARAP NIM PYT XAM TINU V:ylppuSreifilpmA DD )71,4snip(5 .45 7 C DV V:ylppuSrotaunettA ATTN )21nip(V DD 5.0-57 C DV )61,51,41,31snip(slortnoCrotaunettA0 - 5 .5V )81,5snip(segatloVecnerefeRreifilpmA- 5 7.1-C DV )52nip(lortnoChctiwStuptuO0 - 5 .5V erutarepmeTesaC0 5 25 8C ° RETEMARAP NIM XAM TINU V:ylppuSgolanA PUS )71,21,4snip(0 9 C DV )81,5snip(segatloVecnerefeRreifilpmA5 .2- VSUP

2 CDV

FR stupnIreifilpmAtarewoP snip( 62,01 ) -0 6+V mBd )61,51,41,31snip(slortnoCrotaunettA0 6 V )52nip(lortnoChctiwStuptuO0 6 V erutarepmeTegarotS5 5-0 02+C ° erutarepmeTgniredloS- 0 62C ° emiTgniredloS- 5 c eS

Data Sheet - Rev 2.1 ARA1400 Note: As measured in ANADIGICS test fixture. Table 4: DC Electrical Specifications (TA = 25 °C; VDD,VATTN = +5.0 VDC) Table 5: AC Electrical Specifications (TA = 25 °C; VDD, VATTN = +5.0 VDC; Tx = 0 V (switch closed), Tx = +5 V (switch open)) RETEMARAP NIM PYT XAM TINU STNEMMOC )4nip(tnerruC1AreifilpmA- 4 75 9A m )71nip(tnerruC2AreifilpmA- 8 010 31A m )21nip(tnerruCrotaunettA- 2 10 2A m noitpmusnoCrewoPlatoT- 7 9.03 2.1W RETEMARAP NIM PYT XAM TINU STNEMMOC )zHM01(niaG0 32 33 3B dg nittesnoitaunettaBd0 ssentalFniaG- 5 7.0- B dz HM001ot5 erutarepmeTrevonoitairaVniaG- 6 00.0-- C °/Bd spetSnoitaunettA Bd4 Bd8 Bd61 Bd23 6.3 7.7 3.51 0.13 9.3 0.8 7.51 5.13 2.4 3.8 1.61 0.23 Bdc inotonoM zHM54tanoitalosIhctiwS- 5 30 3B d tuptuoniecnereffiD neewteblevellangis ybdnatsdnaevitca )zHM01=of(scinomraH of2 of3 75- 46- 25- 65- cBd VmBd06+=rewopof smhO57otni 3 dr tpecretnItuptuOredrO8 7- - V mBd tnioPnoisserpmoCniaGBd1- 0 7- V mBd erugiFesioN- 7 .15 .2B d rewoPesioNtuptuO .teS.nettA.niM/langiSoN/evitcA .teS.nettA.xaM/langiSoN/evitcA 6.73- 6.45- VmBdh tdiwdnabzHk061ynA zHM24ot5morf ecnadepmItupnI- 5 7- s mhO

6 Data Sheet - Rev 2.1 ARA1400 RETEMARAP NIM PYT XAM TINU STNEMMOC ssoLnruteRtupnI )ecnadepmicitsiretcarahcmhO57( -0 2-5 1-B d ecnadepmItuptuO- 02- 21- 51- 01- smhO desolchctiwS nepohctiwS ssoLnruteRtuptuO )ecnadepmicitsiretcarahcmhO57( 71- 51- 21- 01- Bd desolchctiwS nepohctiwS tneisnarTegatloVtuptuO nepohctiws/desolchctiws -47 p -pVm Note: As measured in ANADIGICS test fixture. continued: AC Electrical Specifications (TA = 25 °C; VDD, VATTN = +5.0 VDC; Tx = 0 V (switch closed), Tx = +5 V (switch open)) Table 6: Logic Interface Specifications (TA = 25 °C; VDD, VATTN = +5.0 VDC) Notes: “L” = logic low, “H” = logic high Table 7: Attenuator Logic RETEMARAP NIM PYT XAM TINU STNEMMOC cigoLlortnoCrotaunettA VIN,LOW VIN,HIGH 7.2 5.0 5.5 V egats.nettasessapyB egats.nettaselbanE ecnadepmIlortnoCrotaunettA- K 5- s mhO cigoLlortnoChctiwStuptuO VIN,LOW VIN,HIGH 8.2

5.5 V desolchctiwS

ecnadepmIlortnoChctiwStuptuO- K 01- s mhO (NOITAUNETTAd ) B 048 2 16 10 24 28 22 36 30 44 48 42 56 50 6 )61nip(tupnIcigoLBd4 LHLHLHLHLHLHLHLH )51nip(tupnIcigoLBd8 LLHHLLHHLLHHLLHH )41nip(tupnIcigoLBd61 LLLL HHHHL L L LHHHH )31nip(tupnIcigoLBd23 LLLLLLLLH H HHHHHH

Data Sheet - Rev 2.1 ARA1400 Figure 4: Test Circuit 0.1uF 22 7 GND ISET1 ATTACG1 RFOUT1 ATTIN VATT 32 dB 16 dB 8 dB ISET2 VA2 RFIN2 4 dB RFIN N/C ATTOUT VREF1 RFOUT ATTACG1 ATTACG1 ATTACG1 VREF2 Tx ATTACG3 ATTACG2 ATTACG2 ATTACG2 ATTACG2(75 Ohms) 0.1uF RF Output (75 Ohms)

3.9 Ohms

+5 V RF Input +5 V

620 Ohms

0.1uF 0.1uF 1uF 0.1uF ARA1400 10uH 1uF1uF Note: Output Switch Closed: Output Switch Control = 0 V Output Switch Open: Output Switch Control = +5 V

20 Ohms

0.1uF0.1uF 1pF 3.3K Ohms 1.8K Ohms 1uF 5K Ohms 0.1uF 1uF 1uF 5K Ohms 0.1uF 0.1uF Output Switch Control (0 / +5 V) 5K Ohms 10K Ohms +5 V 1uF 0.1uF 10uH 3.3K Ohms 1.8K Ohms 1uF

8 Data Sheet - Rev 2.1 ARA1400 0.025 BSC 0.089 0.014 TYP 0.025 MIN. 0.099 0.197 0.163 BODY OUTLINE (NOMINAL) 0.070 0.150 0.060 TYP. 0.400 (12X)0.020 TO 0.060 DIA.P PLATED THRU HOLES. DIMENSIONS IN INCHES

APPLICATION INFORMATION

Amplifier Enable / Disable The ARA1400 includes two amplification stages that each can be shut down through external control pins V REF1 and V REF2 (pins 5 and 18, respectively). By applying a typical bias of 1.75 Volts to these pins, the amplifiers are enabled. In order to fully disable an amplifier, its control pin requires a negative bias of -1.5 to -2.0 Volts. Output Switch Control A switch located at the output of Amplifier A2 in the ARA1400 provides isolation without having to disable the amplifiers. The switch is controled by the Tx logic input (pin 25). Amplifier Bias Current The I SET pins (11 and 27) set the bias current for the amplification stages. Grounding these pins results in the maximum possible current. By placing a resistor from the pin to ground, the current can be reduced. The recommended bias conditions use the configuration shown in the test circuit schematic in Figure 4. Thermal Layout Considerations The device package for the ARA1400 features a heat slug on the bottom of the package body. Use of the heat slug is an integral part of the device design. Soldering it to the ground plane of the PC board will ensure the lowest possible thermal resistance for the device, and will result in the longest MTF (mean time to failure.) A PC board layout that optimizes the benefits of the heat slug is shown in Figure 5. The via holes located under the body of the device must be plated through to a ground plane layer of metal, in order to provide sufficient thermal conductivity. The recommended solder mask outline is shown in Figure 6. ESD Sensitivity Electrostatic discharges can cause permanent damage to these devices. Electrostatic charges accumulate on test equipment and the human body, and can discharge without detection. Proper precautions and handling are strongly recommended. Refer to the ANADIGICS application note on ESD precautions. Figure 5: PC Board Layout

Data Sheet - Rev 2.1 ARA1400 Figure 6: Solder Mask Outline DIMENSIONS IN INCHES 0.145 0.085 0.025 TYP. 0.016 TYP.

0.025 BSC

0.0535 0.242 0.163 0.098 0.091

10 Data Sheet - Rev 2.1 ARA1400 PACKAGE OUTLINE Figure 7: S12 Package Outline - 28 Pin SSOP with Heat Slug

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. IMPORTANT NOTICE 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: Mktg@anadigics.com 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. Data Sheet - Rev 2.1 ARA1400

ORDERING INFORMATION

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