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ARA1400/ARA1400I
Reverse Amplifier with Step Attenuator
FEATURES
* * * * * * *
Data Sheet - Rev 2.0
Low cost integrated monolothic GaAs amplifier with step attenuator Attenuation Range: 0-56 dB, adjustable in 4dB increments via a 4 wire parallel control Meets DOCSIS distortion requirements at +60dBmV output signal level Low distortion and low noise Frequency range: 5-100MHz 5 Volt operation -40 to +85 0C or 0 to +85 0C temperature range options available MCNS/DOCSIS Compliant Cable Modems CATV Interactive Set-Top Box Telephony over Cable Systems OpenCable Set-Top Box Residential Gateway
APPLICATIONS
* * * * *
S12 Package 28 Pin SSOP with Heat Slug
The ARA1400 and the ARA1400I are GaAs ICs designed to provide the reverse path amplification and output level control functions in a CATV Set-Top Box or Cable Modem. Each 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. These devices are capable of meeting the MCNS/DOCSIS requirements for harmonic performance at a +60dBmV output level while requiring only a single
4 Attenuation Control
PRODUCT DESCRIPTION
polarity +5V supply. On each device, 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. Both devices are offered in a 28-pin SSOP package featuring a heat slug on the bottom of the package. Two temperature range options are available: the ARA1400 for commercial applications, and the ARA1400I for industrial applications.
ARA1400 or ARA1400,
LPF
Balun
Upstream QPSK/16QAM Modulator
Clock Data
RAM
ROM
5-42 MHz
Transmit Enable/Disable
MAC
Clock 44 MHz Data
Microcontroller with Ethernet MAC
Diplexer
54-860 MHz
DoubleConversion Tuner
SAW Filter
QAM Receiver with FEC
10Base-T Transceiver
RJ45 Connector
Figure 1. Cable Modem or Set Top Box Application Diagram
07-2001
ARA1400/ARA1400I
RFOUT1
ATTIN
ATTOUT
RFIN2
56 dB 4 dB step digital attenuator section RFIN AMP RFOUT
AMP
ISET1
32 dB
16 dB
8 dB
4 dB
ISET2
Tx
Figure 2: Functional Block Diagram
1 2 3 4 5 6 7 8 9 10 11 12 13 14
GND N/C ATTIN RFOUT1 VREF1 ATTACG1 ATTACG1 ATTACG1 ATTACG1 RFIN ISET1 VATT 32 dB 16 dB
ATTOUT ISET2 RFIN2 Tx ATTACG3 ATTACG2 ATTACG2 ATTACG2 ATTACG2 RFOUT VREF2 VA2 4 dB 8 dB
28 27 26 25 24 23 22 21 20 19 18 17 16 15
Figure 3: Pin Out
2
Data Sheet - Rev 2.0 07-2001
ARA1400/ARA1400I
Table 1: Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
N AME GND N/C ATTIN RFOUT1 VREF1 ATTACG1 ATTACG1 ATTACG1 ATTACG1 RFIN ISET1 VATT 32 dB 16 dB
D ESC R IPTION Ground No C onnecti on
(1)
PIN 15 16 17 18 19
(3)
N AME 8 dB 4 dB V A2 VREF2 RFOUT ATTACG2 ATTACG2 ATTACG2 ATTACG2 ATTACG3 Tx RFIN2 ISET2 ATTOUT
D ESC R IPTION 82 dB Attenuti on C ontrol Bi t 4 dB Attenuti on C ontrol Bi t Ampli fi er A2 Supply Reference Voltage for Ampli fi er A2 RF Output from Swi tch (2) Attenuator AC Ground 2 Attenuator AC Ground 2 Attenuator AC Ground 2 Attenuator AC Ground 2 Attenuator AC Ground 3 Output Swi tch C ontrol Ampli fi er A2 Input (4) Ampli fi er A2 C urrent Adjust Attenuator Output (2)
(3)
Attenuator Input (2) Ampli fi er A1 Output and Supply Reference Voltage for Ampli fi er A1 Attenuator AC Ground 1 Attenuator AC Ground 1 Attenuator AC Ground 1 Attenuator AC Ground 1 Ampli fi er A1 Input (4) Ampli fi er A1 C urrent Adjust Attenuator Supply 32 dB Attenuti on C ontrol Bi t 16 dB Attenuti on C ontrol Bi t
20 21 22 23 24 25 26 27 28
(3)
(3)
(3)
(3)
(3)
(3)
(3)
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.
Data Sheet - Rev 2.0 07-2001
3
ARA1400/ARA1400I
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Minimum and Maximum Ratings
PAR AMETER Analog Supply: VSUP (pi ns 4, 12, 17) Ampli fi er Reference Voltages (pi ns 5, 18)
RF P ower at A mpli fi er Inputs (pi ns 10, 26)
MIN 0 -2.5 0 0 -55 -
MAX 9 VSUP 2 +60 6 6 +200 260 5
U N IT VD C VD C dBmV V V
o
Attenuator C ontrols (pi ns 13, 14, 15, 16) Output Swi tch C ontrol (pi n 25) Storage Temperature Solderi ng Temperature Solderi ng Ti me
C C
o
S ec
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
PAR AMETER Ampli fi er Supply: VDD (pi ns 4, 17) Attenuator Supply: VATTN (pi n 12) Attenuator C ontrols (pi ns 13, 14, 15, 16) Ampli fi er Reference Voltages (pi ns 5, 18) Output Swi tch C ontrol (pi n 25) C ase Temperature - ARA1400 - ARA1400I MIN 4.5 VDD-0.5 0 0 0 -40 TYP 5 5 1.75 25 25 MAX 7 7 5.5 5.5 85 85 U N IT VD C VD C V VD C V
o
C
The device may be operated safely over these conditions; however, parametric performance is guaranteed only over the conditions defined in the electrical specifications.
4
Data Sheet - Rev 2.0 07-2001
ARA1400/ARA1400I Table 4: DC Electrical Specifications TA=25C; VDD, VATTN = +5.0 VDC
PAR AMETER Ampli fi er A1 C urrent (pi n 4) Ampli fi er A2 C urrent (pi n 17) Attenuator C urrent (pi n 12) Total Power C onsumpti on MIN 70 105 12 0.94 TYP 74 81.4 108 121 12 14 0.97 1.08 MAX 95 95 130 130 20 20 1.23 1.23 U N IT mA mA mA W W C OMMEN TS ARA1400 ARA1400I ARA1400 ARA1400I ARA1400 ARA1400I ARA1400 ARA1400I
Table 5: AC Electrical Specifications TA=25C; VDD, VATTN = +5.0 VDC; Tx = 0 V (switch closed), Tx = +5 V (switch open)
PAR AMETER Gai n (10 MHz) Gai n Flatness Gai n Vari ati on over Temperature Attenuati on Steps 4 dB 8 dB 16 dB 32 dB MIN 30 3.6 7.7 15.3 31.0 TYP 32 0.75 -0.006 3.9 8.0 15.7 31.5 35 MAX 33 4.2 8.3 16.1 32.0 30 U N IT dB dB dB/C C OMMEN TS 0 dB attenuati on setti ng 5 to 100 MHz
dB
Monotoni c
Swi tch Isolati on at 45 MHz 2nd Harmoni c D i storti on Level (10 MHz) 3rd Harmoni c D i storti on Level (10 MHz) 3rd Order Output Intercept 1 dB Gai n C ompressi on Poi nt Noi se Fi gure
Note: As measured in ANADIGICS test fixture
dB
D i fference i n output si gnal level between acti ve and standby +60 dBmV i nto 75 Ohms +60 dBmV i nto 75 Ohms
78 -
-57 -64 70 1.7
-52 -56 2.5
dB c dB c dBmV dBmV dB
Data Sheet - Rev 2.0 07-2001
5
ARA1400/ARA1400I continued: AC Electrical Specifications TA=25C; VDD, VATTN = +5.0 VDC; Tx = 0 V (switch closed), Tx = +5 V (switch open)
PAR AMETER Output Noi se Power Acti ve / No Si gnal / Mi n. Atten. Set. Acti ve / No Si gnal / Max. Atten. Set. Input Impedance Input Return Loss (75 Ohm characteri sti c i mpedance) Output Impedance Output Return Loss (75 Ohm characteri sti c i mpedance) Output Voltage Transi ent swi tch closed / swi tch open
Note: As measured in ANADIGICS test fixture
MIN -
TYP 75 -20 -20 -12 -17 -15 4
MAX -37.6 -54.6 -15 -15 -10 -12 -10 7
U N IT dBmV Ohms dB Ohms dB mVp-p
C OMMEN TS Any 160 kHz bandwi dth from 5 to 42 MHz
Swi tch closed Swi tch open Swi tch closed Swi tch open
Table 6: Logic Interface Specifications TA=25C; VDD, VATTN = +5.0 VDC
PAR AMETER Attenuator C ontrol Logi c VIN,LOW VIN,HIGH Attenuator C ontrol Impedance Output Swi tch C ontrol Logi c VIN,LOW VIN,HIGH Output Swi tch C ontrol Impedance MIN 0 2.7 0 2.8 TYP 5K 10K MAX 0.5 5.5 1 5.5 U N IT C OMMEN TS Bypasses atten. stage Enables atten. stage
V Ohms
V Ohms
Swi tch closed Swi cth open
Table 7: Attenuator Logic
ATTEN U ATION (dB ) 4 dB Logi c Input (pi n 16) 8 dB Logi c Input (pi n 15) 16 dB Logi c Input (pi n 14) 32 dB Logi c Input (pi n 13) 0 L L L L 4 H L L L 8 L H L L 12 H H L L 16 L L H L 20 H L H L 24 L H H L 28 H H H L 32 L L L H 36 H L L H 40 L H L H 44 H H L H 48 L L H H 52 H L H H 56 L H H H 60 H H H H
Note: L = logic low, H = logic high
6
Data Sheet - Rev 2.0 07-2001
+5 V
1uF 5K Ohms 0.1uF 3.3K Ohms 10uH 0.1uF
1 2 3
GND N/C ATTIN RFOUT1 VREF1 ATTACG1 ATTACG1 ATTACG1 ATTACG1 RFIN ISET1 VATT 32 dB 16 dB ARA1400 or ARA1400,
ATTOUT 28 ISET2 27 RFIN2
26
0.1uF 5K Ohms Output Switch Control (0 / +5 V)
1uF
4 5
Tx 25 ATTACG3 24 ATTACG2 23 ATTACG2
22
0.1uF
Figure 4: Test Circuit
1.8K Ohms 620 Ohms RF Input (75 Ohms) 0.1uF 1pF
20 Ohms 0.1uF
6 7 8 9
1uF 0.1uF 620 Ohms 1uF
0.1uF
10K Ohms
8 dB
32 dB
16 dB
4 dB
Data Sheet - Rev 2.0 07-2001
ATTACG2 21 ATTACG2 20 RFOUT VREF2
19 18 17
1uF
10
0.1uF 1.8K Ohms
RF Output (75 Ohms)
0.1uF
11 12
3.9 Ohms
1uF
1uF
13 14
VA2 4 dB 16 8 dB 15
20 Ohms 10uH 1uF 3.3K Ohms
+5 V 5K Ohms
0.1uF 1uF
+5 V
Note: Output Switch Closed: Output Switch Control = 0 V Output Switch Open: Output Switch Control = +5 V
ARA1400/ARA1400I
7
ARA1400/ARA1400I
APPLICATION INFORMATION
Amplifier Enable / Disable The ARA1400 and the ARA1400I include two amplification stages that each can be shut down through external control pins VREF1 and VREF2 (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 and the ARA1400I provides isolation without having to disable the amplifiers. The switch is controled by the Tx logic input (pin 25.) Amplifier Bias Current The ISET 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 and the ARA1400I 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 8
Data Sheet - Rev 2.0 07-2001
ARA1400/ARA1400I
Figure 6: Solder Mask Outline
Data Sheet - Rev 2.0 07-2001
9
ARA1400/ARA1400I
PACKAGE OUTLINE
Figure 7: S12 Package Outline - 28 Pin SSOP with Heat Slug
10
Data Sheet - Rev 2.0 07-2001
ARA1400/ARA1400I
COMPONENT PACKAGING
Volume quantities of the ARA1400 and the ARA1400I are supplied on tape and reel. Each reel holds 3,500 pieces. Smaller quantities are available in plastic tubes of 50 pieces.
Figure 8: Reel Dimensions
DIRECTION OF FEED
Figure 9: Tape Dimensions
Data Sheet - Rev 2.0 07-2001
11
ARA1400/ARA1400I
ORDERING INFORMATION
OR D ER N U MB ER ARA1400S12C TR ARA1400S12C ARA1400IS12C TR ARA1400IS12C TEMPER ATU R E R AN GE 0 to 85 0C 0 to 85 0C -40 to 85 0C -40 to 85 0C PAC K AGE D ESC R IPTION 28 Pi n SSOP wi th Heat Slug 28 Pi n SSOP wi th Heat Slug 28 Pi n SSOP wi th Heat Slug 28 Pi n SSOP wi th Heat Slug C OMPON EN T PAC K AGIN G 3,500 pi ece tape and reel Plasti c tubes (50 pi eces per tube) 3,500 pi ece tape and reel Plasti c tubes (50 pi eces per tube)
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 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 products 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.
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.
WARNING
12
Data Sheet - Rev 2.0 07-2001

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