AD8328ACP-REEL Analog Devices Inc, AD8328ACP-REEL Datasheet

IC LINE DRIVE CBLE 5V 20LFCSP TR

AD8328ACP-REEL

Manufacturer Part Number
AD8328ACP-REEL
Description
IC LINE DRIVE CBLE 5V 20LFCSP TR
Manufacturer
Analog Devices Inc
Type
Line Driver, Transmitterr
Datasheet

Specifications of AD8328ACP-REEL

Rohs Status
RoHS non-compliant
Applications
Modems, Set-Top Boxes
Mounting Type
Surface Mount
Package / Case
20-LFCSP
FEATURES
Supports DOCSIS and EuroDOCSIS standards for reverse
Gain programmable in 1 dB steps over a 59 dB range
Low distortion at 60 dBmV output
Output noise level @ minimum gain 1.2 nV/√Hz
Maintains 300 Ω output impedance Tx-enable and
Upper bandwidth: 107 MHz (full gain range)
5 V supply operation
Supports SPI interfaces
APPLICATIONS
DOCSIS and EuroDOCSIS cable modems
CATV set-top boxes
CATV telephony modems
Coaxial and twisted pair line drivers
GENERAL DESCRIPTION
The AD8328
driving. The features and specifications make the AD8328
ideally suited for MCNS-DOCSIS and EuroDOCSIS 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 Ω 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 μA.
The AD8328 is packaged in a low cost 20-lead LFCSP and
a 20-lead QSOP. The AD8328 operates from a single 5 V supply
and has an operational temperature range of −40°C to +85°C.
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.
path transmission systems
−57.5 dBc SFDR at 21 MHz
−54 dBc SFDR at 65 MHz
Tx-disable condition
1
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
V
1
V
IN+
IN–
Patent pending.
–50
–52
–54
–56
–58
–60
–62
–64
–66
–68
–70
GND
Z
Z
DIFF
OR
SINGLE
INPUT
AMP
IN
IN
5
(SINGLE) = 800Ω
(DIFF) = 1.6kΩ
Figure 2. Worst Harmonic Distortion vs. Frequency
FUNCTIONAL BLOCK DIAGRAM
V
@ MAX GAIN,
THIRD HARMONIC
DATEN
OUT
15
= 60dBmV
VERNIER
SDATA CLK
© 2005 Analog Devices, Inc. All rights reserved.
V
@ MAX GAIN,
SECOND HARMONIC
OUT
25
FREQUENCY (MHz)
Cable Line Driver
AD8328
Figure 1.
= 60dBmV
ATTENUATION
DATA LATCH
REGISTER
DECODE
35
SHIFT
CORE
5 V Upstream
8
8
8
45
BYP
TXEN
POWER-DOWN
POWER
AD8328
AMP
LOGIC
www.analog.com
Z
300Ω
55
OUT
SLEEP
DIFF =
65
V
V
RAMP
OUT+
OUT–

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AD8328ACP-REEL Summary of contents

Page 1

FEATURES Supports DOCSIS and EuroDOCSIS standards for reverse path transmission systems Gain programmable steps over range Low distortion at 60 dBmV output −57.5 dBc SFDR at 21 MHz −54 dBc SFDR at 65 MHz ...

Page 2

AD8328 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Logic Inputs (TTL-/CMOS-Compatible Logic)....................... 4 Timing Requirements .................................................................. 4 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 ...

Page 3

SPECIFICATIONS T = 25° Ω, V (differential dBmV. The AD8328 is characterized using a 2:1 transformer Table 1. Parameter INPUT CHARACTERISTICS Specified AC Voltage ...

Page 4

AD8328 1 TOKO 458 PT-1087 used for above specifications. Typical insertion loss of 0 MHz. 2 Guaranteed by design and characterization to ±4 sigma for T 3 Measured through a 2:1 transformer. 4 Specification is worst case ...

Page 5

DS VALID DATA-WORD G1 SDATA MSB .LSB CLK CLOCK CYCLES DATEN GAIN TRANSFER (G1) TXEN t GS ANALOG OUTPUT SIGNAL AMPLITUDE (p-p) Figure 3. Serial Interface Timing VALID ...

Page 6

AD8328 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage V CC Input Voltage IN+ IN− DATEN, SDATA, CLK, SLEEP, TXEN Internal Power Dissipation QSOP (θ = 83.2°C/ LFCSP (θ = 30.4°C/W) JA Operating Temperature ...

Page 7

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS GND GND 3 18 GND 4 17 AD8328 IN+ TOP VIEW (Not to Scale IN– GND 7 14 DATEN 8 13 SDATA 9 ...

Page 8

AD8328 TYPICAL PERFORMANCE CHARACTERISTICS –55 – 60dBmV OUT V = 61dBmV OUT @ MAX GAIN @ MAX GAIN –65 – 59dBmV OUT @ MAX GAIN – FREQUENCY (MHz) Figure 7. Second-Order Harmonic ...

Page 9

DEC60 20 DEC54 10 DEC48 DEC42 0 DEC36 DEC30 –10 DEC24 –20 DEC18 DEC12 –30 DEC 1 TO DEC 6 –40 0 100 FREQUENCY (MHz) Figure 13. AC Response 1 10MHz 1.2 1.0 0.8 ...

Page 10

AD8328 APPLICATIONS GENERAL APPLICATIONS The AD8328 is primarily intended for use as the power amplifier (PA) in Data Over Cable Service Interface Specification (DOCSIS)-certified cable modems and CATV set-top boxes. The upstream signal is either a QPSK or QAM signal ...

Page 11

V CC 10µ 150Ω IN 165Ω V IN– 1kΩ DATEN 1kΩ SDATA 1kΩ CLK 1kΩ TXEN 1kΩ SLEEP Table 6. Adjacent Channel Power Channel Symbol Rate (kSym/s) 160 320 640 1280 2560 5120 The output impedance ...

Page 12

AD8328 INITIAL POWER-UP When the supply voltage is first applied to the AD8328, the gain of the amplifier is initially set to Gain Code 1. Since power is first applied to the amplifier, the TXEN pin should be held low ...

Page 13

DIFFERENTIAL SIGNAL SOURCE Typical applications for the AD8328 use a differential input signal from a modulator or a DAC. See Table 7 for common values of R4, or calculate other input configurations using Equation 2. This circuit configuration will give ...

Page 14

AD8328 RUNNING AD8328 SOFTWARE To load the control software Start, Programs, CABDRIVE_28 or select the AD8328.exe file from the installed directory. Once loaded, select the proper parallel port to communicate with the AD8328 (see Figure 24). Figure 24. ...

Page 15

C1A 0.1µ IN TOKO 78.7Ω 617DB-A0070 C2A V _A 0.1μF IN– R3 R17 TP1 R5 R6 1kΩ 0Ω TP2 R7 R8 1kΩ 0Ω TP3 R9 R10 1kΩ 0Ω ...

Page 16

AD8328 Figure 27. Primary Side Figure 28. Component Side Silkscreen Figure 29. Internal Power Plane Figure 30. Internal Ground Plane Figure 31. Secondary Side Figure 32. Secondary Side Silkscreen Rev Page ...

Page 17

OUTLINE DIMENSIONS PIN 1 INDICATOR 1.00 0.85 0.80 SEATING PLANE COPLANARITY 4.00 BSC SQ 0.60 MAX TOP 3.75 VIEW BCS SQ 0.75 0.55 0.35 0.80 MAX 12° MAX 0.65 TYP 0.05 MAX 0.02 NOM 0.20 COPLANARITY 0.50 REF 0.08 BSC ...

Page 18

... AD8328ARQZ –40°C to +85°C 1 AD8328ARQZ-REEL –40°C to +85°C AD8328ACP –40°C to +85°C AD8328ACP-REEL –40°C to +85°C AD8328ACP-REEL7 –40°C to +85°C AD8328ACPZ 1 –40°C to +85°C 1 AD8328ACPZ-REEL –40°C to +85°C AD8328ACPZ-REEL7 1 –40°C to +85°C ...

Page 19

NOTES Rev Page AD8328 ...

Page 20

AD8328 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03158–0–10/05(A) Rev Page ...

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