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MFG:ADI D/C:09
Part Number: AD8325
MFG: ADI
D/C: 09
Description: The AD8325 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line dri...
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AD8325
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DataSheet
General Description
AD8325 General 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 comprises a digitally controlled variable attenuator of 0 dB to 59.45 dB, which is preceded by a low noise, fixed gain buffer and is followed by a low distortion high power amplifier. The AD8325 accepts a differential or single-ended input signal. The output is specified for driving a 75 Ω load, such as coaxial cable.
Distortion performance of 57 dBc is achieved with an output level up to 61 dBmV at 21 MHz bandwidth. A key performance and cost advantage of the AD8325 results from the ability to maintain a constant 75 Ω output impedance during Transmit Enable and Transmit Disable conditions. In addition, this device has a sleep mode function that reduces the quiescent current to 4 mA.
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.
AD8325 Maximum Ratings
Supply Voltage +VS
Pins 5, 9, 10, 19, 20, 23, 27 . . . . . . . . . . . . . . . . . . . . 6 V
Input Voltages
Pins 25, 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5 V
Pins 1, 2, 3, 6, 7 . . . . . . . . . . . . . . . . . . 0.8 V to +5.5 V
Internal Power Dissipation
TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.9 W
Operating Temperature Range . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . 65°C to +150°C
Lead Temperature, Soldering 60 seconds . . . . . . 300°C
Pins 5, 9, 10, 19, 20, 23, 27 . . . . . . . . . . . . . . . . . . . . 6 V
Input Voltages
Pins 25, 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5 V
Pins 1, 2, 3, 6, 7 . . . . . . . . . . . . . . . . . . 0.8 V to +5.5 V
Internal Power Dissipation
TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.9 W
Operating Temperature Range . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . 65°C to +150°C
Lead Temperature, Soldering 60 seconds . . . . . . 300°C
AD8325 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 75 Output Impedance
Transmit Enable and Transmit Disable Modes
Upper Bandwidth: 100 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
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 75 Output Impedance
Transmit Enable and Transmit Disable Modes
Upper Bandwidth: 100 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
AD8325 Typical Application
Gain-Programmable Line Driver
DOCSIS High-Speed Data Modems
Interactive Cable Set-Top Boxes
PC Plug-in Cable Modems
General-Purpose Digitally Controlled Variable Gain Block
DOCSIS High-Speed Data Modems
Interactive Cable Set-Top Boxes
PC Plug-in Cable Modems
General-Purpose Digitally Controlled Variable Gain Block
AD8325 Connection Diagram
AD8325
PDF/DataSheet Download
- Datasheet: AD8325
- File Size: 319640 KB
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