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Analog Devices Semiconductor Electronic Components Datasheet

AD8322 Datasheet

5 V CATV Line Driver Coarse Step Output Power Control

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AD8322 pdf
a
5 V CATV Line Driver
Coarse Step Output Power Control
AD8322
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 6 dB Steps Over a 42 dB
Range
Low Distortion at 60 dBmV Output
–58 dBc SFDR at 21 MHz
–56 dBc SFDR at 42 MHz
Output Noise Level
–46 dBmV in 160 kHz Bandwidth
Maintains 75 Output Impedance
Power-Up and Power-Down Condition
180 MHz Bandwidth
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain Programmable Line Driver
DOCSIS-Compliant Data Modems
Interactive Set-Top Boxes
PC Plug-in Modems
General-Purpose Digitally Controlled Variable Gain Block
FUNCTIONAL BLOCK DIAGRAM
VCC (7 PINS)
R1
AD8322
VIN+
VIN–
DIFF
OR SINGLE
INPUT
AMP
BUFFER
R2
ZIN (SINGLE) = 210
ZIN (DIFF) = 235
ATTENUATION
CORE
8
DECODE
8
DATA LATCH
POWER
AMP
ZOUT DIFF =
75
POWER-DOWN
LOGIC
VOUT+
VOUT–
8
SHIFT
REGISTER
DATEN DATA CLK GND (12 PINS)
PD
GENERAL DESCRIPTION
The AD8322 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 42.14 dB range, with gain steps of 6.02 dB/major
carry.
The AD8322 comprises a digitally controlled variable attenuator
of 0 dB to –42.14 dB, which is preceded by a low-noise, fixed-gain
buffer and is followed by a low-distortion, high-power ampli-
fier. The AD8322 accepts a differential or single-ended input
signal. The output is specified for driving a 75 load, such as
coaxial cable.
Distortion performance of –58 dBc is achieved with an output level
up to 60 dBmV at 21 MHz bandwidth. A key performance and
cost advantage of the AD8322 results from the ability to maintain
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.
The AD8322 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.
55
fO = 42MHz
VO = 60dBmV
@ MAX GAIN
60
HD3
65
HD2
70
75
1
24
8 16 32 64 128
GAIN CODE Decimal
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

AD8322 Datasheet

5 V CATV Line Driver Coarse Step Output Power Control

No Preview Available !

AD8322 pdf
AD8322–SPECIFICATIONS (TA = 25؇C, VS = 5 V, RL = RIN = 75 , VIN = 92 mV p-p differential, VOUT measured through
a 1:1 transformer1 with 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
POUT = 60 dBmV, Max Gain
Max Gain, f = 10 MHz
Single-Ended Input
Differential Input
92 mV p-p
11.8 dB
210
235
2 pF
GAIN CONTROL INTERFACE
Gain Range
Maximum Gain
Minimum Gain
Gain Scaling Factor
Gain Code = 1xxxxxxx
Gain Code = 00000001
41.0 42.14
27.5 29.5
–14.64 –12.64
6.02
43.2
31.5
–10.64
dB
dB
dB
dB/Major Carry
OUTPUT CHARACTERISTICS
Bandwidth (–3 dB)
Bandwidth Roll-Off
Bandwidth Peaking
Output Noise
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
180
0.25
0.05
–32
–46
–68
19
75 ± 20%
MHz
dB
dB
dBmV in 160 kHz BW
dBmV in 160 kHz BW
dBmV in 160 kHz BW
dBm
OVERALL PERFORMANCE
Second Order Harmonic Distortion2
Third Order Harmonic Distortion
Gain Linearity Error
Output Settling to 1 mV
Due to Gain Change
Due to Input Change
Signal Feedthrough
POWER CONTROL
Power-Up Settling Time to 1 mV
Power-Down Settling Time to 1 mV
Between Burst Transients3
POWER SUPPLY
Operating Range
Quiescent Current
f = 5 MHz, POUT = 60 dBmV @ Max Gain
f = 14 MHz, POUT = 60 dBmV @ Max Gain
f = 21 MHz, POUT = 60 dBmV @ Max Gain
f = 32 MHz, POUT = 60 dBmV @ Max Gain
f = 42 MHz, POUT = 60 dBmV @ Max Gain
f = 65 MHz, POUT = 60 dBmV @ Max Gain
f = 5 MHz, POUT = 60 dBmV @ Max Gain
f = 14 MHz, POUT = 60 dBmV @ Max Gain
f = 21 MHz, POUT = 60 dBmV @ Max Gain
f = 32 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 0.09 V p-p
Max Gain, Power-Down, f = 42 MHz,
VIN = 0.09 V p-p
Max Gain, VIN = 0
Max Gain, VIN = 0
Equivalent POUT = 17.6 to 35.67 dBmV
Equivalent POUT = 60 dBmV
Power-Up Mode
Power-Down Mode
4.75
100
44
–64
–60
–58
–57
–56
–52
–67
–64
–61
–58
–56
–53
± 0.2
60
30
–24
300
40
3
16
5
113
54
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dB
ns
ns
dBc
ns
ns
mV p-p
mV p-p
5.25 V
126 mA
60 mA
OPERATING TEMPERATURE
RANGE
–40 +85 °C
NOTES
1TOKO # 617 DB-A0070 used for above specifications. MACOM ETC-1-IT-15 can be substituted.
2All distortion measurements taken with differential input signal and represent worst distortion across all gain codes.
3Between burst transients measured at the output of PULSE B5008 42 MHz diplexer.
Specifications subject to change without notice.
–2– REV. 0


Part Number AD8322
Description 5 V CATV Line Driver Coarse Step Output Power Control
Maker Analog Devices
Total Page 16 Pages
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