Datasheet > ADA4320-1

ADA4320-1

更新时间： 2024-11-26 06:36:15

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	365K
描述
High Power, Low Distortion Upstream

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ADA4320-1 数据手册

High Power, Low Distortion Upstream

CATV Line Driver

ADA4320-1

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Supports CableLabs® DOCSIS 3.0/2.0 and EuroDOCSIS

3.0/2.0 specifications for customer premises equipment

(CPE) upstream transmission

VIN–

VIN+

VOUT+

VOUT–

DIFF OR

SINGLE

INPUT

AMP

ATTENUATION

CORE

POWER

AMP

VERNIER

5 V single-supply operation

300Ω

DIFF =

Excellent adjacent channel rejection performance

−66 dBc ACPR for a single QPSK channel

−63 dBc ACPR for 4× QAM64 channels

Gain programmable in 1 dB steps over a 59 dB range

Gain range: −27 dB to +32 dB

OUT

(SINGLE) = 320Ω

(DIFF) = 640Ω

DECODE

POWER-DOWN

LOGIC

RAMP

DATA LATCH

ADA4320-1

SHIFT

Current-scaled output stage

GND

DATEN SDATA CLK

TXEN

SLEEP

Low between-burst output noise level

−70 dB mV in 160 kHz bandwidth

Figure 1.

Maintains constant output impedance in enable, disable,

and sleep conditions

Selectable low power modes

12 mA in Tx disable

12 μA in sleep mode (full power-down)

3-wire, SPI-compatible interface

4 mm × 5 mm 24-lead LFCSP, RoHS compliant

APPLICATIONS

DOCSIS 3.0 and EuroDOCSIS cable modems/E-MTAs

DOCSIS 3.0 set-top boxes

CATV telephony modems

Coaxial or twisted pair line drivers

GENERAL DESCRIPTION

The ADA4320-1 is a high power, ultralow distortion amplifier

designed for CATV reverse channel line driving. Its features and

specifications make the ADA4320-1 ideally suited for DOCSIS 3.0-

and EuroDOCSIS 3.0-based applications. Both gain and output

stage current are controlled via a 3-wire (SPI-compatible) interface.

A single 8-bit serial word selects one of four available supply

current presets and one of sixty gain codes.

The ADA4320-1 features an output driver stage that scales

quiescent current consumption according to gain setting. In

multichannel mode at maximum gain (32 dB), the device draws

260 mA from a single 5 V supply, enabling the high power,

ultralow distortion performance required by multiple DOCSIS 3.0

upstream channels. For lifeline E-MTA applications, the ADA4320-1

output stage current can be throttled via SPI commands, reducing

the power requirement for single-channel transmission by up to

30%. In transmit-disable mode, the ADA4320-1 draws only 12 mA.

The device also features a full power-down sleep mode that

further reduces current draw to12 μA typical.

The ADA4320-1 has been tailored to address both the high output

drive and stringent fidelity requirements of DOCSIS 3.0. The

part is able to maintain excellent adjacent channel rejection

performance over the full 5 MHz to 85 MHz range, even with

multiple bonded channels at maximum specified output levels.

The ADA4320-1 is packaged in a RoHS-compliant, 24-lead

exposed pad LFCSP and is rated for operation over the −40°C

to +85°C temperature range.

The ADA4320-1 accepts a differential or single-ended input

signal. The output is specified for driving a single-ended 75 Ω

load through a 4:1 impedance transformer.

Rev. 0

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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