ARA1400 [ANADIGICS]
Reverse Amplifier with Step Attenuator; 反向放大器，步进衰减器
| 型号： | ARA1400 |
| 厂家： | 
ANADIGICS, INC |
| 描述： | Reverse Amplifier with Step Attenuator |
| 文件： | 总12页 (文件大小：285K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ARA1400
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
S12 Package
28 Pin SSOP with Heat Slug
Residential Gateway
PRODUCT DESCRIPTION
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.
4
Attenuation Control
Upstream
QPSK/16QAM
Modulator
ARA1400
LPF
Balun
RAM
ROM
Clock
Data
Data
Transmit Enable/Disable
Microcontroller
with Ethernet
MAC
5-42 MHz
MAC
Clock
44 MHz
SAW
Filter
Double-
Conversion
Tuner
QAM Receiver
with FEC
54-860 MHz
RJ45
Connector
10Base-T
Transceiver
Diplexer
Figure 1: Cable Modem or Set Top Box Application Diagram
03/2004
ARA1400
RFOUT1
ATT IN
ATT OUT
RFIN2
56 dB 4 dB step digital attenuator section
RFIN
RFOUT
AMP
AMP
ISET1
32 dB
16 dB
8 dB
4 dB
ISET2
Tx
Figure 2: Functional Block Diagram
GND
N/C
ATTOUT
1
28
I
SET2
2
3
27
26
25
24
23
22
21
20
19
ATTIN
RFIN2
RFOUT1
Tx
4
VREF1
ATTACG3
5
ATT ACG1
ATT ACG1
ATT ACG1
ATT ACG1
RFIN
ATTACG2
ATTACG2
ATTACG2
ATTACG2
RFOUT
6
7
8
9
10
I
SET1
VREF2
11
12
13
14
18
17
16
15
VATT
VA2
32 dB
16 dB
4 dB
8 dB
Figure 3: Pinout
Data Sheet - Rev 2.1
03/2004
2
ARA1400
Table 1: Pin Description
PIN
1
NAME
GND
N/C
DESCRIPTION
PIN
15
NAME
DESCRIPTION
Ground
8 dB
4 dB
82 dB Attenution Control Bit
4 dB Attenution Control Bit
Amplifier A2 Supply
(1)
2
No Connection
16
3
ATTIN
Attenuator Input (2)
17
V
A2
Amplifier A1 Output and
Supply
Reference Voltage for
Amplifier A2
4
5
RFOUT1
18
19
V
REF2
Reference Voltage for
Amplifier A1
V
REF1
RFOUT
RF Output from Switch (2)
(3)
(3)
(3)
(3)
(3)
6
7
ATTACG1
ATTACG1
ATTACG1
ATTACG1
RFIN
Attenuator AC Ground 1
Attenuator AC Ground 1
Attenuator AC Ground 1
Attenuator AC Ground 1
Amplifier A1 Input (4)
20
21
22
23
24
25
26
27
28
ATTACG2
ATTACG2
ATTACG2
ATTACG2
ATTACG3
Tx
Attenuator AC Ground 2
(3)
Attenuator AC Ground 2
(3)
8
Attenuator AC Ground 2
(3)
9
Attenuator AC Ground 2
(3)
10
11
12
13
Attenuator AC Ground 3
ISET1
Amplifier A1 Current Adjust
Attenuator Supply
Output Switch Control
Amplifier A2 Input (4)
V
ATT
RFIN2
32 dB
16 dB
32 dB Attenution Control Bit
16 dB Attenution Control Bit
ISET2
Amplifier A2 Current Adjust
Attenuator Output (2)
14
ATTOUT
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 2.1
03/2004
3
ARA1400
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Minimum and Maximum Ratings
PARAMETER
MIN
MAX
UNIT
Analog Supply: VSUP (pins 4, 12, 17)
0
9
VDC
V
SUP
2
Amplifier Reference Voltages (pins 5, 18)
-2.5
VDC
RF Power at Amplifier Inputs (pins 10, 26
Attenuator Controls (pins 13, 14, 15, 16)
Output Switch Control (pin 25)
Storage Temperature
)
-
0
+60
6
dBmV
V
0
6
V
-55
-
+200
260
5
°C
Soldering Temperature
°C
Soldering Time
-
Sec
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
PARAMETER
MIN
TYP
MAX
UNIT
Amplifier Supply: VDD (pins 4, 17)
Attenuator Supply: VATTN (pin 12)
Attenuator Controls (pins 13, 14, 15, 16)
Amplifier Reference Voltages (pins 5, 18)
Output Switch Control (pin 25)
Case Temperature
4.5
5
5
7
7
VDC
VDC
V
V
DD-0.5
0
-
-
5.5
-
1.75
-
VDC
V
0
0
5.5
85
25
°C
The device may be operated safely over these conditions; however, parametric
performance is guaranteed only over the conditions defined in the electrical specifications.
Data Sheet - Rev 2.1
03/2004
4
ARA1400
Table 4: DC Electrical Specifications
(T
A
= 25 °C; VDD,VATTN = +5.0 VDC)
PARAMETER
MIN
TYP
MAX
UNIT
COMMENTS
Amplifier A1 Current (pin 4)
Amplifier A2 Current (pin 17)
Attenuator Current (pin 12)
Total Power Consumption
-
-
-
-
74
108
12
95
130
20
mA
mA
mA
W
0.97
1.23
Table 5: AC Electrical Specifications
= 25 °C; VDD, VATTN = +5.0 VDC; Tx = 0 V (switch closed), Tx = +5 V (switch open))
(T
A
PARAMETER
MIN
TYP
MAX
UNIT COMMENTS
Gain (10 MHz)
30
-
32
33
-
dB
dB
0 dB attenuation setting
Gain Flatness
0.75
5 to 100 MHz
Gain Variation over Temperature
-
-0.006
-
dB/°C
Attenuation Steps
4 dB
3.6
7.7
3.9
8.0
4.2
8.3
8 dB
dB
Monotonic
16 dB
15.3
31.0
15.7
31.5
16.1
32.0
32 dB
Difference in output
signal level between
active and standby
Switch Isolation at 45 MHz
-
35
30
dB
Harmonics (fo = 10MHz)
2fo
3fo
-
-
-57
-64
-52
-56
fo power = +60 dBmV
into 75 Ohms
dBc
3rd Order Output Intercept
1 dB Gain Compression Point
Noise Figure
78
-
-
-
-
dBmV
dBmV
dB
70
1.7
-
2.5
Output Noise Power
Active / No Signal / Min. Atten. Set.
Active / No Signal / Max. Atten. Set.
-
-
-
-
-37.6
-54.6
dBmV Any 160 kHz bandwidth
from 5 to 42 MHz
Input Impedance
-
75
-
Ohms
Note: As measured in ANADIGICS test fixture.
Data Sheet - Rev 2.1
03/2004
5
ARA1400
continued: AC Electrical Specifications
(TA
= 25 °C; VDD, VATTN = +5.0 VDC; Tx = 0 V (switch closed), Tx = +5 V (switch open))
PARAMETER
MIN
TYP
MAX
UNIT COMMENTS
Input Return Loss
-
-20
-15
dB
(75 Ohm characteristic impedance)
-20
-12
-15
-10
Switch closed
Ohms
Output Impedance
-
Switch open
Output Return Loss
-
-
-17
-15
-12
-10
Switch closed
dB
(75 Ohm characteristic impedance)
Switch open
Output Voltage Transient
-
4
7
mVp-p
switch closed / switch open
Note: As measured in ANADIGICS test fixture.
Table 6: Logic Interface Specifications
(T
A
= 25 °C; VDD, VATTN = +5.0 VDC)
PARAMETER
MIN
TYP
MAX
UNIT COMMENTS
Attenuator Control Logic
V
V
IN,
LOW
0
-
-
0.5
5.5
Bypasses atten. stage
V
IN
,
HIGH
2.7
Enables atten. stage
Attenuator Control Impedance
-
5 K
-
Ohms
Output Switch Control Logic
V
V
IN,
LOW
0
-
-
1
Switch closed
Swicth open
V
IN
,
HIGH
2.8
5.5
Output Switch Control Impedance
-
10 K
-
Ohms
Table 7: Attenuator Logic
ATTENUATION (dB)
0
L
L
L
L
4
H
L
L
L
8
L
H
L
L
12 16 20 24 28 32 36 40 44 48 52 56 60
4 dB Logic Input (pin 16)
8 dB Logic Input (pin 15)
16 dB Logic Input (pin 14)
32 dB Logic Input (pin 13)
H
H
L
L
L
H
L
L
H
H
L
H
H
H
L
L
L
H
L
L
H
L
H
H
L
L
L
H
L
L
H
H
H
H
H
H
H
H
L
H
L
L
L
H
H
H
H
L
H
H
H
H
Notes: “L” = logic low, “H” = logic high
Data Sheet - Rev 2.1
03/2004
6
ARA1400
4 d B
8 d B
1 6 d B
3 2 d B
Figure 4: Test Circuit
Data Sheet - Rev 2.1
03/2004
7
ARA1400
APPLICATION INFORMATION
Amplifier Enable / Disable
Thermal Layout Considerations
The ARA1400 includes two amplification stages that
each can be shut down through external control pins
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.)
V
REF1 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 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.
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 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.
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.
0.025 BSC
0.089
0.014 TYP
BODY OUTLINE
(NOMINAL)
0.025 MIN.
0.163
0.099
0.070
0.197
(12X)0.020 TO 0.060 DIA.P
0.060 TYP.
PLATED THRU HOLES.
0.400
DIMENSIONS IN INCHES
Figure 5: PC Board Layout
Data Sheet - Rev 2.1
03/2004
8
ARA1400
0.016 TYP.
0.091
0.0535
0.025 TYP.
0.163
0.242
0.085
0.098
0.025 BSC
0.145
DIMENSIONS IN INCHES
Figure 6: Solder Mask Outline
Data Sheet - Rev 2.1
03/2004
9
ARA1400
PACKAGE OUTLINE
Figure 7: S12 Package Outline - 28 Pin SSOP with Heat Slug
Data Sheet - Rev 2.1
03/2004
10
ARA1400
COMPONENT PACKAGING
Volume quantities of the ARA1400 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
Figure 9: Tape Dimensions
Data Sheet - Rev 2.1
03/2004
11
ARA1400
ORDERING INFORMATION
TEMPERATURE
PACKAGE
ORDER NUMBER
ARA1400S12CTR
ARA1400S12C
COMPONENT PACKAGING
3,500 piece tape and reel
RANGE
DESCRIPTION
28 Pin SSOP
with Heat Slug
0 to 85 °C
28 Pin SSOP
with Heat Slug
0 to 85 °C
Plastic tubes (50 pieces 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 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.
Data Sheet - Rev 2.1
03/2004
12
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