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Analog Devices Semiconductor Electronic Components Datasheet

AD8320 Datasheet

Serial Digital Controlled Variable Gain Line Driver

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AD8320 pdf
a
Serial Digital Controlled
Variable Gain Line Driver
AD8320
FEATURES
8-Bit Serial Gain Control
V/V/LSB Linear Gain Response
36 dB Gain Range
؎0.20 dB Gain Accuracy
Upper Bandwidth: 150 MHz
22 dBm 1 dB Compression Point (75 )
Drives Low Distortion Signals into 75 Load:
–57 dBc SFDR at 42 MHz and 12 dBm Out
–46 dBc SFDR at 42 MHz and 18 dBm Out
Single Supply Operation from 5 V to 12 V
Maintains 75 Output Impedance
Power-Up and Power-Down Condition
Supports SPI Input Control Standard
APPLICATIONS
Coaxial Cable Driver
HFC Cable Telephony Systems
HFC High Speed Data Modems
Interactive Set-Top Boxes
PC Plug-In Modems
Interfaces with AD9853 I2C Controlled Digital Modulator
High Performance Digitally Controlled Variable Gain
Block
VREF
VIN
FUNCTIONAL BLOCK DIAGRAM
VCC GND
REFERENCE
AD8320
INV.
ATTENUATOR CORE
PWR AMP
VOUT
REVERSE
AMP
BUF.
DATA LATCH
DATA SHIFT REGISTER
POWER-
DOWN/
SWITCH
INTER.
PD
DATEN CLK
SDATA
DESCRIPTION
The AD8320 is a digitally controlled variable gain amplifier
optimized for coaxial line driving applications. An 8-bit serial
word determines the desired output gain over a 36 dB range
(256 gain levels). The AD8320 provides linear gain response.
The AD8320 is made up of a digitally controlled variable at-
tenuator of 0 dB to –36 dB, which is preceded by a low noise,
fixed gain buffer and followed by a low distortion high power
amplifier. The AD8320 has a 220 input impedance and ac-
cepts a single-ended input signal with a specified analog input
level of up to 0.310 V p-p. The output is specified for driving a
75 load, such as coaxial cable, although the AD8320 is ca-
pable of driving other loads. Distortion performance of –57 dBc
is achieved with an output level up to 12 dBm (3.1 V p-p) at
42 MHz, while –46 dBc distortion is achieved with an output
level up to 18 dBm (6.2 V p-p).
A key performance and cost advantage of the AD8320 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 back-termination, resulting in twice
the effective output voltage when compared to a standard opera-
tional amplifier. Additionally, the on-chip 75 termination
results in low glitch output during power-down and power-up
transitions, eliminating the need for an external switch.
The AD8320 is packaged in a 20-lead SOIC and operates from
a single +5 V through +12 V supply and has an operational
temperature range of –40°C to +85°C.
؊20
؊30
PO = 18dBm
؊40
؊50
PO = 8dBm
؊60
PO = 12dBm
؊70
PO = 4dBm
؊80
1
10
FREQUENCY – MHz
100
Figure 1. Worst Harmonic Distortion vs. Frequency for
Various Output Levels at VCC = 12 V
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., 1998


Analog Devices Semiconductor Electronic Components Datasheet

AD8320 Datasheet

Serial Digital Controlled Variable Gain Line Driver

No Preview Available !

AD8320 pdf
AD8320–SPECIFICATIONS (@ VCC = 12 V, TA = +25؇C, VIN = 0.310 V p-p, RL = 75 , RS = 75 unless
otherwise noted)
Parameter
INPUT CHARACTERISTICS
Full-Scale Input Voltage
Input Resistance
Input Capacitance
Conditions
Max Gain, POUT = 18 dBm, VCC = 12 V
Max Gain, POUT = 12 dBm, VCC = 5 V
Min Typ
0.310
0.155
220
2.0
Max Units
V p-p
V p-p
pF
GAIN CONTROL INTERFACE
Gain Range
Full Scale (Max) Gain
Gain Offset (Min) Gain
Gain Scaling Factor
36
26 (20)
–10.0 (0.316)
0.077
dB
dB (V/V)
dB (V/V)
V/V/LSB
OUTPUT CHARACTERISTICS
Bandwidth (–3 dB)
Bandwidth Roll-Off
Bandwidth Peaking
Output Offset Voltage
Output Offset Drift
Output Noise Spectral Density
1 dB Compression Point
Output Impedance
Overload Recovery
OVERALL PERFORMANCE
Worst Harmonic Distortion
3rd Order Intercept
Full-Scale (Max Gain) Accuracy
Gain Offset (Min Gain) Accuracy
Gain Accuracy
Gain Drift
Gain Variation w/Supply
Output Settling to 1 mV
Gain Change @ TDATEN = 1
Input Change
POWER CONTROL
Power-Down Settling Time to 1 mV
Power-Up Settling Time to 1 mV
Power-Down Pedestal Offset
Spectral Output Leakage
Maximum Reverse Power
All Gain Codes
F = 65 MHz
F = 65 MHz
All Gain Codes
Full Temperature Range
Max. Gain, Frequency = 10 MHz
Min. Gain, Frequency = 10 MHz
PD = 0, Frequency = 10 MHz
VCC = 12 V
VCC = 5 V
Power Up and Power Down
Max Gain, VIN = 500 mV p-p
F = 42 MHz, POUT = 12 dBm, VCC = 12 V
F = 42 MHz, POUT = 12 dBm, VCC = 5 V
F = 42 MHz, POUT = 18 dBm, VCC = 12 V
F = 65 MHz, POUT = 12 dBm, VCC = 12 V
F = 65 MHz, POUT = 12 dBm, VCC = 5 V
F = 65 MHz, POUT = 18 dBm, VCC = 12 V
F = 42 MHz, POUT = 18 dBm, VCC = 12 V
F = 42 MHz, POUT = 12 dBm, VCC = 5 V
F = 65 MHz, POUT = 18 dBm, VCC = 12 V
F = 65 MHz, POUT = 12 dBm, VCC = 5 V
F = 10 MHz
F = 10 MHz
F = 10 MHz, All Gain Codes
Full Temperature Range
VCC = +5 V to 12 V
Min to Max Gain, VIN = 0.31 V p-p
Max Gain, VIN = 0 V to 0.31 V p-p
Max Gain, VIN = 0
Max Gain, VIN = 0
Max Gain, VIN = 0
F (PD) = 400 Hz @ 15% Duty Cycle
5 MHz F 65 MHz
PD = 0
150
0.7
0
± 40
± 0.25
73
53
4.5
22.5
16
65 75
40
–0.75
–57.0
–43.0
–46.0
–57.0
–42.5
–43.0
34
32
32.5
28.5
± 0.1
± 0.2
± 0.2
± 0.5
35
30
25
45
65
± 30
–70
5
MHz
dB
dB
mV
mV/°C
nV/Hz
nV/Hz
nV/Hz
dBm
dBm
85
ns
–52.0
–39.0
–42.0
–52.0
–39.0
–40.0
0.75
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dBm
dBm
dB
dB
dB
mdB/°C
mdB/V
ns
ns
ns
ns
mV
dBm
dBm
POWER SUPPLY
Specified Operating Range
Quiescent Current
Power Down
Power Up, VCC = +12 V
Power Down, VCC =+12 V
PD = 1, VCC = +5 V
PD = 0, VCC = +5 V
PD = 1, VCC = +12 V
PD = 0, VCC = +12 V
+5
80
25
97
32
+12 V
85 mA
30 mA
105 mA
37 mA
–2– REV. 0


Part Number AD8320
Description Serial Digital Controlled Variable Gain Line Driver
Maker Analog Devices
Total Page 20 Pages
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