AD8324JRQ-REEL7 Analog Devices Inc, AD8324JRQ-REEL7 Datasheet

AD8324JRQ-REEL7

Manufacturer Part Number

AD8324JRQ-REEL7

Description

IC,TV/VIDEO CIRCUIT,Driver,SSOP,20PIN,PLASTIC

Manufacturer

Analog Devices Inc

Datasheet

1.AD8324JRQ-REEL7.pdf (16 pages)

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FEATURES

Supports DOCSIS 2.0 and Euro-DOCSIS standards for

Gain programmable in 1 dB steps over a 59 dB range

Low distortion at 61 dBmV output:

Output noise level @ minimum gain 1.3 nV/√Hz

Maintains 75 Ω output impedance in TX-enable and

Upper bandwidth: 100 MHz (full gain range)

3.3 V supply operation

Supports SPI® interfaces

APPLICATIONS

DOCSIS 2.0 and Euro-DOCSIS cable modems

CATV set-top boxes

CATV telephony modems

Coaxial and twisted pair line drivers

GENERAL DESCRIPTION

The AD8324

driving. The features and specifications make the AD8324

ideally suited for DOCSIS 2.0 and Euro-DOCSIS applications.

The gain of the AD8324 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 AD8324 accepts a differential or single-ended input signal.

The output is specified for driving a 75 Ω load through a 1:1

transformer.

Distortion performance of –54 dBc is achieved with an output

level up to 61 dBmV at 65 MHz bandwidth.

This device has a sleep mode function that reduces the quies-

cent current to 30 μA and a full power-down function that

reduces power-down current to 2.5 mA.

The AD8324 is packaged in a low cost 20-lead LFCSP package

and a 20-lead QSOP package. The AD8324 operates from a

single 3.3 V supply.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

reverse path transmission systems

–59 dBc SFDR at 21 MHz

–54 dBc SFDR at 65 MHz

Transmit-disable condition

is a low cost amplifier designed for coaxial line

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

IN+

IN–

Patent pending.

–40

–50

–60

–70

–80

DIFF

OR SINGLE

INPUT

AMP

AD8324

GND

(SINGLE) = 550Ω

(DIFF) = 1100Ω

Figure 2. Worst Harmonic Distortion vs. Frequency

FUNCTIONAL BLOCK DIAGRAM

DATEN

Figure 1. Functional Block Diagram

THIRD HARMONIC

OUT

VERNIER

= 61dBmV @ DEC 60

DATA C LK

FREQUENCY (MHz)

Cable Line Driver

ATTENUATION

DATA LATCH

SECOND HARMONIC

3.3 V Upstream

OUT

DECODE

CORE

SHIFT

= 61dBmV @ DEC 60

BYP

TXEN

DOWN LOGIC

www.analog.com

OUTPUT

STAGE

POWER-

AD8324

75Ω

OUT

SLEEP

DIFF =

RAMP

OUT+

OUT–

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