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Analog Devices Semiconductor Electronic Components Datasheet

AD8327 Datasheet

5 V CATV Line Driver Coarse Step Output Power Control

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a
5 V CATV Line Driver Coarse Step
Output Power Control
AD8327
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 6.02 dB Steps over a 48.16 dB
Range
Low Distortion at 60 dBmV Output
–63 dBc SFDR at 21 MHz
–57 dBc SFDR at 42 MHz
Output Noise Level
–47 dBmV in 160 kHz
Maintains 75 Output Impedance
Transmit Enable and Transmit Disable Modes
Upper Bandwidth: 160 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain-Programmable Line Driver
DOCSIS High-Speed Data Modems
Interactive Cable Set-Top Boxes
PC Plug-in Cable Modems
General-Purpose Digitally Controlled Variable Gain Block
FUNCTIONAL BLOCK DIAGRAM
VCC (5 PINS)
R1
BYP
AD8327
VIN+
VIN–
DIFF OR
SINGLE
INPUT
AMP
VERNIER
R2
ZIN (SINGLE) = 800
ZIN (DIFF) = 1.6k
ATTENUATION
CORE
POWER
AMP
VOUT
8
DECODE
ZOUT = 75
8
DATA LATCH
POWER-DOWN
LOGIC
CXR
8
SHIFT
REGISTER
DATEN DATA CLK GND (5 PINS) TXEN SLEEP
GENERAL DESCRIPTION
The AD8327 is a low-cost, digitally controlled, variable gain
amplifier 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 48.16 dB range resulting in gain changes of
6.02 dB/major carry.
The AD8327 comprises a digitally controlled variable attenuator
of 0 dB to –48.16 dB, which is preceded by a low noise, fixed
gain buffer and followed by a low distortion, high power amplifier.
The AD8327 accepts a differential or single-ended input
signal. The output is specified for driving a 75 load, such
as coaxial cable.
Distortion performance of –63 dBc is achieved with an output
level up to 60 dBmV at 21 MHz bandwidth. A key performance
and cost advantage of the AD8327 results from the ability to
maintain a constant 75 output impedance during Transmit
Enable and Transmit Disable conditions. In addition, this
device has a sleep mode function that reduces the quiescent
current to 5 mA.
The AD8327 is packaged in a low-cost 20-lead TSSOP, operates
from a single 5 V supply, and has an operational temperature
range of –40°C to +85°C.
50
VOUT = 60dBmV @ MAX GAIN
55
HD3
60
HD2
65
70
75
5
15 25 35 45 55
FUNDAMENTAL FREQUENCY MHz
65
Figure 1. Harmonic Distortion vs. Frequency
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. 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
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001


Analog Devices Semiconductor Electronic Components Datasheet

AD8327 Datasheet

5 V CATV Line Driver Coarse Step Output Power Control

No Preview Available !

AD8327–SPECIFICATIONS (TA = 25؇C, VS = 5 V, RL = 75 , VIN(DIFFERENTIAL) = 30 dBmV)
Parameter
Conditions
Min Typ Max Unit
INPUT CHARACTERISTICS
Specified AC Voltage
Noise Figure
Input Resistance
Input Capacitance
POUT = 60 dBmV, Max Gain
Max Gain, f = 10 MHz
Single-Ended Input
Differential Input
30
13.2
800
1600
2
dBmV
dB
pF
GAIN CONTROL INTERFACE
Gain Range
Maximum Gain
Minimum Gain
Gain Scaling Factor
Gain Code = 10000000 (128 Decimal)
Gain Code = 00000000 (0 Decimal)
47.16
29
–19.16
48.16
30
–18.16
6.02
49.16
31
–17.16
dB
dB
dB
dB/Major
Carry
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
All Gain Codes
Max Gain, f = 10 MHz
Min Gain, f = 10 MHz
Transmit Disable Mode (TXEN = 0),
f = 10 MHz
Max Gain, f = 10 MHz
Transmit Enable (TXEN = 1) and
Transmit Disable Mode (TXEN = 0)
160
0.4
0
–32
–47
–66
14.8
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
Adjacent Channel Power
Gain Linearity Error
Output Settling
Due to Gain Change (TGS)
Due to Input Change
Isolation in Transmit Disable Mode
f = 21 MHz, VOUT = 60 dBmV @ Max Gain
f = 42 MHz, VOUT = 60 dBmV @ Max Gain
f = 65 MHz, VOUT = 60 dBmV @ Max Gain
f = 21 MHz, VOUT = 60 dBmV @ Max Gain
f = 42 MHz, VOUT = 60 dBmV @ Max Gain
f = 65 MHz, VOUT = 60 dBmV @ Max Gain
Adjacent Channel Width = Transmit Channel
Width = 160 KSYM/SEC
f = 10 MHz, Code to Code
Min to Max Gain
Max Gain, VIN = 30 dBmV
Max Gain, TXEN = 0 V, f = 42 MHz,
VIN = 30 dBmV
POWER CONTROL
Transmit Enable Settling Time (TON)1
Transmit Disable Settling Time (TOFF)1
Transmit Enable Settling Time (TON)2
Transmit Disable Settling Time (TOFF)2
Between Burst Transients2
Ramp Setting2
Max Gain, VIN = 0 V
Max Gain, VIN = 0 V
Max Gain, VIN = 0 V
Max Gain, VIN = 0 V
Equivalent Output = 31 dBmV
Equivalent Output = 60 dBmV
–63
–61
–54
–63
–57
–57
–62
± 0.25
60
30
–52
300
40
2
1.7
3
25
2
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dB
ns
ns
dBc
ns
ns
µs
µs
mV p-p
mV p-p
µs
POWER SUPPLY
Operating Range
Quiescent Current
Transmit Enable Mode (TXEN = 1) @ Dec 128
Transmit Enable Mode (TXEN = 1) @ Dec 0
Transmit Disable Mode @ All Gain Codes
Sleep Mode @ All Gain Codes
4.75
75
40
10
3
5
105
60
15
5
5.25 V
135 mA
80 mA
20 mA
7 mA
OPERATING TEMPERATURE
RANGE
–40 +85 °C
NOTES
1For Transmit Enable or Transmit Disable transitions using a 0 pF capacitor (at CXR pin) to ground.
2For Transmit Enable or Transmit Disable transitions using a 100 pF capacitor (at CXR pin) to ground.
Specifications subject to change without notice.
–2– REV. 0


Part Number AD8327
Description 5 V CATV Line Driver Coarse Step Output Power Control
Maker Analog Devices
Total Page 20 Pages
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