AD8325:  5 V CATV Line Driver Fine Step Output Power Control

The AD8325 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. ...More

AD8325:  5 V CATV Line Driver Fine Step Output Power Control

Product Description

The AD8325 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.

The AD8325 is packaged in a low-cost 28-lead TSSOP, operates from a single 5 V supply, and has an operational temperature range of -40°C to +85°C.

An evaluation board is available for this product and may be ordered using the following product number AD8325-EVAL.

Features

  • Supports DOCSIS Standard for Reverse Path Transmission
  • Gain Programmable in 0.75 dB Steps Over a 59.45 dB Range
  • Low Distortion at 61 dBmV Output
    –57 dBc SFDR at 21 MHz
    –55 dBc SFDR at 42 MHz
  • Output Noise Level: –48 dBmV in 160 kHz
  • Maintains 75Ω Output Impedance
    Transmit Enable and Transmit Disable Modes
  • Upper Bandwidth:100 MHz (Full Gain Range)
  • 5 V Supply Operation
  • Supports SPI Interfaces

Diagrams

AD8325 Diagram
Functional Block Diagram for AD8325

Specifications

Application Cable
Function CATV Line Driver
Voltage Supply (V) 5
-3 dB BW (MHz) 100MHz
Package 28-Lead TSSOP
Distortion (dBc) -57dBc
Spectral Noise (nV/rtHz) 56nV/rtHz
Gain (dB) 59dB
Gain Low End (dB) -29.5dB
Gain High End (dB) +30dB

Explore Other Products

Part# Application Function Voltage Supply (V) Minimum Gain (Acl) -3 dB BW (MHz) Slew Rate (V/us) Iout Drive (mA) Distortion (dBc) Spectral Noise (nV/rtHz) Price* (1000-4999)
AD45048 DSL Driver +/- 6, 12 - 65 55 230 -80 - $2.32
AD8320 Cable CATV Line Driver 5 to 12 n/a 150 n/a n/a -57 53 -
AD8322 Cable CATV Line Driver 5 - 180 - - -58 64 $3.19
AD8324 Cable CATV Line Driver 3.3 - 100 - - -59 157 $1.73
AD8325 Cable CATV Line Driver 5 - 100 - - -57 56 $3.34
AD8326 Cable CATV Line Driver 7 to 12 - 100 - - -57 100 $3.95
AD8327 Cable CATV Line Driver 5 - 160 - - -63 64 $3.80
AD8328 Cable CATV Line Driver 5 - 107 - - -57 135 $1.92
AD8390 DSL Driver +/- 12 5 100 300 400 -82 8 $2.29
AD8391 DSL Driver +/- 6 1 60 600 175 -80 4 $2.13
AD8392 DSL Driver +/- 12 1 65 900 400 -82 4 $3.94
AD8393 DSL Driver 12 5 100 - 500 -73 4 -
ADA4304-2 - Active RF Splitter - - 1600 - - -62 - $0.70
ADA4310-1 - - - 1 190 820 - -69 2.85 $1.45

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

Pricing, Packaging & Availability

Help

Model
The model number is a specific version of a generic that can be purchased or sampled.

Status
Status indicates the current lifecycle of the product. This can be one of 4 stages:
  • Pre-Release: The model has not been released to general production, but samples may be available.
  • Production: The model is currently being produced, and generally available for purchase and sampling.
  • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
  • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
Package Description
The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Production Availability
This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

RoHS Compliant
Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples iinto your cart to check sample availability.

View Sales and Distribution Offices