AD8323ARU-REEL Analog Devices Inc, AD8323ARU-REEL Datasheet

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AD8323ARU-REEL

Manufacturer Part Number
AD8323ARU-REEL
Description
IC LN DVR CATV FINE-STEP 28TSSOP
Manufacturer
Analog Devices Inc
Type
Line Driver, Transmitterr
Datasheet

Specifications of AD8323ARU-REEL

Rohs Status
RoHS non-compliant
Applications
Modems, Set-Top Boxes
Mounting Type
Surface Mount
Package / Case
28-TSSOP
For Use With
AD8323-EVAL - BOARD EVAL FOR AD8323

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD8323ARU-REEL
Manufacturer:
MICREL
Quantity:
15 947
a
GENERAL DESCRIPTION
The AD8323 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 53.5 dB range resulting in gain changes of 0.7526 dB/LSB.
The AD8323 comprises a digitally controlled variable attenuator
of 0 dB to –53.5 dB, which is preceded by a low noise, fixed
gain buffer and is followed by a low distortion high power am-
plifier. The AD8323 accepts a differential or single-ended input
signal. The output is specified for driving a 75 Ω load, such as
coaxial cable.
Distortion performance of –56 dBc is achieved with an output
level up to 60 dBmV at 21 MHz bandwidth. A key performance
and cost advantage of the AD8323 results from the ability to main-
tain a constant 75 Ω output impedance during power-up and
power-down conditions. This eliminates the need for external 75 Ω
termination, resulting in twice the effective output voltage when
compared to a standard operational amplifier. In addition, this
device has a sleep mode function that reduces the quiescent
current to 4 mA.
The AD8323 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.
V
V
IN+
IN–
5 V CATV Line Driver Fine Step
Z
Z
IN
IN
(SINGLE) = 800
(DIFF) = 1.6k
–50
–55
–60
–65
–70
–75
DIFF OR
SINGLE
INPUT
AMP
0
R1
R2
FUNCTIONAL BLOCK DIAGRAM
DATEN
V
8
CC
(7 PINS)
Output Power Control
BUFFER
16
DATA CLK
GAIN CONTROL – DEC Code
24
AD8323
32
ATTENUATION
DATA LATCH
GND (11 PINS)
HD3
HD2
REGISTER
DECODE
CORE
SHIFT
F
P
40
O
O
8
8
8
= 42MHz
= 60dBmV @ MAX GAIN
48
BYP
POWER-DOWN
AD8323
PD
POWER
56
AMP
LOGIC
Z
OUT
SLEEP
64
75
DIFF =
72
V
V
OUT+
OUT–

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AD8323ARU-REEL Summary of contents

Page 1

GENERAL DESCRIPTION The AD8323 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 ...

Page 2

AD8323–SPECIFICATIONS Parameter INPUT CHARACTERISTICS Specified AC Voltage Noise Figure Input Resistance Input Capacitance GAIN CONTROL INTERFACE Gain Range Maximum Gain Minimum Gain Gain Scaling Factor OUTPUT CHARACTERISTICS Bandwidth (–3 dB) Bandwidth Roll-Off Bandwidth Peaking Output Noise Spectral Density 1 dB ...

Page 3

LOGIC INPUTS (TTL/CMOS Compatible Logic) Parameter Logic “1” Voltage Logic “0” Voltage = 5 V) CLK, SDATA, DATEN Logic “1” Current (V INH = 0 V) CLK, SDATA, DATEN Logic “0” Current (V INL = Logic “1” ...

Page 4

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Model Temperature Range AD8323ARU –40°C to +85°C AD8323ARU-REEL –40°C to +85°C AD8323-EVAL Thermal Resistance measured on SEMI standard 4-layer board. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

Page 5

V TOKO 617DB–A0070 CC 1:1 0 OUT 0 IN– OUT– R 82.5 TI OUT+ V IN+ GND 0.1 F 0.1 F 39.2 1.5 1.0 0 10MHz 0 5MHz f = 42MHz ...

Page 6

AD8323 –60 – 62dBmV OUT @ MAX GAIN P = 61dBmV OUT –70 @ MAX GAIN P –75 @ MAX GAIN – 58dBmV OUT @ MAX GAIN – FUNDAMENTAL FREQUENCY – MHz ...

Page 7

APPLICATIONS General Application The AD8323 is primarily intended for use as the upstream power amplifier (PA) in DOCSIS (Data Over Cable Service Interface Specifications) certified cable modems and CATV set- top boxes. Upstream data is modulated in QPSK or QAM ...

Page 8

AD8323 Output Bias, Impedance, and Termination The differential output pins V and V OUT level of approximately V /2. Therefore, the outputs should CC be ac-coupled before being applied to the load. This may be accomplished by connecting ...

Page 9

... The ability of the PULSE diplexer to achieve DOCSIS compliance is neither expressed 1280 K 2560 K SYM/SEC SYM/SEC –56.6 –56.3 nor implied by Analog Devices Inc. Data on the diplexer should –54.8 –55.4 be obtained from PULSE. –53.6 –54.2 –53.3 –53.5 Differential Inputs – ...

Page 10

AD8323 Single-Ended-to-Differential Input (Figure 8, Option 1) Install the Mini-Circuits T1-6T-KK81 1:1 transformer in the T1 location of the evaluation board. Place 0 Ω chip resistors at locations JP1, JP2, and JP3 such that the signal coming ...

Page 11

EVALUATION BOARD FEATURES AND OPERATION AD8323 ...

Page 12

AD8323 ...

Page 13

AD8323 ...

Page 14

AD8323 G9 2,4,6,7,8 = OUT 10 G8 PULSEB5008 A– ...

Page 15

AD8323 Evaluation Board Rev. C SINGLE-ENDED INVERTING INPUT – Revised – June 22, 2000 Qty. Description 10 µ ‘C’ size tantalum chip capacitor 1 0.1 µ 1206 size ceramic chip capacitor 12 0 Ω 1/8 W. ...

Page 16

AD8323 PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead TSSOP (RU-28) 0.386 (9.80) 0.378 (9.60 0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25 0.0433 (1.10) MAX 8 ...

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