Features: Supports DOCSIS and EuroDOCSIS Standards for Reverse Path Transmission Systems
Gain Programmable in 1 dB Steps over a 59 dB Range
Low Distortion at 60 dBmV Output:
57.5 dBc SFDR at 21 MHz
54 dBc SFDR at 65 MHz
Output Noise Level @ Minimum Gain 1.2 nV/HZ
Maintains 300 Output Impedance TX-Enable and Transmit-Disable Condition
Upper Bandwidth: 107 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
ApplicationDOCSIS and EuroDOCSIS Cable Modems
CATV Set-Top Boxes
CATV Telephony Modems
Coaxial and Twisted Pair Line Driver
Pinout
SpecificationsSupply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Input Voltage
VIN+, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......1.5 V p-p
DATEN, SDATA, CLK,
SLEEP, TXEN . . . . . . . . . . . . . . . . . . . . ...........0.8 V to +5.5 V
Internal Power Dissipation
QSOP, LFCSP . . . . . . . . . . . . . . . . . . . . . . . . . . . ..........700 mW
Operating Temperature Range . . . . . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . . . .65°C to +150°C
Lead Temperature, Soldering 60 seconds . . . . . . . . . . ...300°C
| Gain Control |
Digital |
| -3 dB BW (MHz) |
107MHz |
| Gain Low End (dB) |
-27.5dB |
| Gain High End (dB) |
+31.5dB |
| Number of Channels |
1 |
| Spectral Noise (nV/rtHz) |
135nV/rtHz |
| Supply Current |
120mA |
| Gain Accuracy (dB) |
±1dB |
DescriptionThe AD8328 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8328 ideally suited for MCNS-DOCSIS and Euro-DOCSIS applications. The gain of the AD8328 is digitally controlled. An 8-bit serial word determines the desired output gain over a 59 dB range, resulting in gain changes of 1 dB/LSB.
The AD8328 accepts a differential or single-ended input signal. The output is specified for driving a 75 load through a 2:1 transformer.
Distortion performance of 53 dBc is achieved with an output level up to 60 dBmV at 65 MHz bandwidth over a wide temperature range.
This device has a sleep mode function that reduces the quiescent current to 2.6 mA and a full power-down function that reduces power-down current to 20 A.
The AD8328 is packaged in a low cost 20-lead LFCSP package and a 20-lead QSOP package. The AD8328 operates from a single 5 V supply and has an operational temperature range of 40°C to +85°C.
AD8328 Data Sheet
