Features: 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
ApplicationGain-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
Pinout
SpecificationsSupply 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 DescriptionThe AD8325 is a low-cost, digitally controlled, variable gain ampli-fier 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 ampli-fier. The AD8325 accepts a differential or single-ended input signal. The output is specified for driving a 75 load, such as coaxial cable.
Distortion performance of57 dBc is achieved with an output level up to 61 dBmV at 21MHz bandwidth. A key performance and cost advantage of the AD8325 results from the ability to maintain a constant 75 output impedance during Transmit Enable and Transmit Disable conditions. In addition, this device has a sleep mode function that reduces the quiescent current to 4mA.
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.
Parameters: | Technical/Catalog Information | AD8325ARU-REEL |
| Vendor | Analog Devices Inc |
| Category | Integrated Circuits (ICs) |
| Mounting Type | Surface Mount |
| Package / Case | 28-TSSOP |
| Type | Line Driver, Transmitter |
| Packaging | Tape & Reel (TR) |
| Applications | Modems, Set-Top Boxes |
| RoHS Status | RoHS Non-Compliant |
| Other Names | AD8325ARU REEL
AD8325ARUREEL
|
AD8325ARU-REEL Data Sheet
