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Analog Devices Semiconductor Electronic Components Datasheet

AD8323 Datasheet

5 V CATV Line Driver Fine Step Output Power Control

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AD8323 pdf
a
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 0.75 dB Steps Over a 53.5 dB
Range
Low Distortion at 60 dBmV Output
–56 dBc SFDR at 21 MHz
–55 dBc SFDR at 42 MHz
Output Noise Level
–48 dBmV in 160 kHz
Maintains 75 Output Impedance
Power-Up and Power-Down Condition
Upper Bandwidth: 100 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain-Programmable Line Driver
HFC High-Speed Data Modems
Interactive Set-Top Boxes
PC Plug-in Modems
General-Purpose Digitally Controlled Variable Gain Block
5 V CATV Line Driver Fine Step
Output Power Control
AD8323
FUNCTIONAL BLOCK DIAGRAM
VCC (7 PINS)
R1
VIN+
VIN–
DIFF OR
SINGLE
INPUT
AMP
BUFFER
R2
ZIN (SINGLE) = 800
ZIN (DIFF) = 1.6k
BYP
AD8323
ATTENUATION
CORE
8
DECODE
POWER
AMP
ZOUT DIFF =
75
VOUT+
VOUT–
8
DATA LATCH
POWER-DOWN
LOGIC
8
SHIFT
REGISTER
DATEN DATA CLK GND (11 PINS) PD
SLEEP
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 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 output impedance during power-up and
power-down conditions. This eliminates the need for external 75
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.
50
FO = 42MHz
PO = 60dBmV @ MAX GAIN
55
60 HD3
65
HD2
70
75
0
8 16 24 32 40 48 56 64 72
GAIN CONTROL DEC Code
Figure 1. Harmonic Distortion vs. Gain Control
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000


Analog Devices Semiconductor Electronic Components Datasheet

AD8323 Datasheet

5 V CATV Line Driver Fine Step Output Power Control

No Preview Available !

AD8323 pdf
AD8323–SPECIFICATIONS (TA = 25؇C, VS = 5 V, RL = RIN = 75 , VIN = 116 mV p-p, VOUT measured through a 1:1
transformer1 with an insertion loss of 0.5 dB @ 10 MHz unless otherwise noted.)
Parameter
Conditions
Min Typ
Max Unit
INPUT CHARACTERISTICS
Specified AC Voltage
Noise Figure
Input Resistance
Input Capacitance
Output = 60 dBmV, Max Gain
Max Gain, f = 10 MHz
Single-Ended Input
Differential Input
116
13.8
800
1600
2
mV p-p
dB
pF
GAIN CONTROL INTERFACE
Gain Range
Maximum Gain
Minimum Gain
Gain Scaling Factor
Gain Code = 71 Dec
Gain Code = 0 Dec
52.5 53.5
26.5 27.5
–27 –26
0.7526
54.5 dB
28.5 dB
–25 dB
dB/LSB
OUTPUT CHARACTERISTICS
Bandwidth (–3 dB)
Bandwidth Roll-Off
Bandwidth Peaking
Output Noise Spectral Density
1 dB Compression Point
Differential Output Impedance
All Gain Codes
f = 65 MHz
f = 65 MHz
Max Gain, f = 10 MHz
Min Gain, f = 10 MHz
Power-Down Mode, f = 10 MHz
Max Gain, f = 10 MHz
Power-Up and Power-Down
100
1.3
0
–34
–48
–68
18.5
75 ± 20%
MHz
dB
dB
dBmV in
160 kHz
dBmV in
160 kHz
dBmV in
160 kHz
dBm
OVERALL PERFORMANCE
Second Order Harmonic Distortion
Third Order Harmonic Distortion
Gain Linearity Error
Output Settling to 1 mV
Due to Gain Change
Due to Input Step Change
Signal Feedthrough
f = 21 MHz, POUT = 60 dBmV @ Max Gain
f = 42 MHz, POUT = 60 dBmV @ Max Gain
f = 65 MHz, POUT = 60 dBmV @ Max Gain
f = 21 MHz, POUT = 60 dBmV @ Max Gain
f = 42 MHz, POUT = 60 dBmV @ Max Gain
f = 65 MHz, POUT = 60 dBmV @ Max Gain
f = 10 MHz, Code to Code
Min to Max Gain
Max Gain, VIN = 0 V to 116 mV p-p
Max Gain, PD = 0, f = 42 MHz
–77
–71
–64
–56
–55
–53
± 0.3
60
30
–30
dBc
dBc
dBc
dBc
dBc
dBc
dB
ns
ns
dBc
POWER CONTROL
Power-Up Settling Time to 1 mV
Power-Down Settling Time to 1 mV
Between Burst Transients2
Max Gain, VIN = 0
Max Gain, VIN = 0
Equivalent Output = 31 dBmV
Equivalent Output = 60 dBmV
300 ns
40 ns
3 mV p-p
30 mV p-p
POWER SUPPLY
Operating Range
Quiescent Current
Power-Up Mode
Power-Down Mode
Sleep Mode
4.75 5
123 133
30 35
24
5.25 V
140 mA
40 mA
7 mA
OPERATING TEMPERATURE
RANGE
–40 +85 °C
NOTES
1TOKO 617DB-A0070 used for above specifications. MACOM ETC-1-IT-15 can be substituted.
2Between Burst Transients measured at the output of a 42 MHz diplexer.
Specifications subject to change without notice.
–2– REV. 0


Part Number AD8323
Description 5 V CATV Line Driver Fine Step Output Power Control
Maker Analog Devices
Total Page 16 Pages
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