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AD8366 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8366
Beschreibung Dual-Digital Variable Gain Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
AD8366 Datasheet, Funktion
DC to 600 MHz,
Dual-Digital Variable Gain Amplifiers
AD8366
FEATURES
Matched pair of differential, digitally controlled VGAs
Gain range: 4.5 dB to 20.25 dB
0.25 dB gain step size
Operating frequency
DC to 150 MHz (2 V p-p)
3 dB bandwidth: 600 MHz
Noise figure (NF)
11.4 dB at 10 MHz at maximum gain
18 dB at 10 MHz at minimum gain
OIP3: 45 dBm at 10 MHz
HD2/HD3
Better than −90 dBc for 2 V p-p output at 10 MHz at
maximum gain
Differential input and output
Adjustable output common-mode
Optional dc output offset correction
Serial/parallel mode gain control
Power-down feature
Single 5 V supply operation
FUNCTIONAL BLOCK DIAGRAM
VPSIA
IPPA
IPMA
ENBL
ICOM
IPMB
IPPB
VPSIB
DIGITAL GAIN
CONTROL LOGIC
BIT0/CS
BIT1/SDAT
BIT2/SCLK
BIT3
OCOM
BIT4
BIT 5
DENA
Figure 1.
APPLICATIONS
Baseband I/Q receivers
Diversity receivers
Wideband ADC drivers
GENERAL DESCRIPTION
The AD8366 is a matched pair of fully differential, low noise and
low distortion, digitally programmable variable gain amplifiers
(VGAs). The gain of each amplifier can be programmed separately
or simultaneously over a range of 4.5 dB to 20.25 dB in steps of
0.25 dB. The amplifier offers flat frequency performance from dc
to 70 MHz, independent of gain code.
The AD8366 offers excellent spurious-free dynamic range, suitable
for driving high resolution analog-to-digital converters (ADCs).
The NF at maximum gain is 11.4 dB at 10 MHz and increases
~2 dB for every 4 dB decrease in gain. Over the entire gain range,
the HD3/HD2 are better than −90 dBc for 2 V p-p at the output at
10 MHz into 200 Ω. The two-tone intermodulation distortion of
−90 dBc into 200 Ω translates to an OIP3 of 45 dBm (38 dBVrms).
The differential input impedance of 200 Ω provides a well-defined
termination. The differential output has a low impedance of ~25 Ω.
The output common-mode voltage defaults to VPOS/2 but can
be programmed via the VCMA and VCMB pins over a range
of voltages. The input common-mode voltage also defaults
to VPOS/2 but can be driven down to 1.5 V. A built-in, dc offset
compensation loop can be used to eliminate dc offsets from prior
stages in the signal chain. This loop can also be disabled if dc-
coupled operation is desired.
The digital interface allows for parallel or serial mode gain
programming. The AD8366 operates from a 4.75 V to 5.25 V
supply and consumes typically 180 mA. When disabled, the
part consumes roughly 3 mA. The AD8366 is fabricated using
Analog Devices, Inc., advanced silicon-germanium bipolar
process, and it is available in a 32-lead exposed paddle LFCSP
package. Performance is specified over the −40°C to +85°C
temperature range.
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2010-2011 Analog Devices, Inc. All rights reserved.






AD8366 Datasheet, Funktion
AD8366
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltages, VPSIx and VPSOx
ENBL, SENB, DENA, DENB, BIT0, BIT1, BIT2,
BIT3, BIT4, BIT5
IPPA, IPMA, IPPB, IPMB
OPPA, OPMA, OPPB, OPMB
OFSA, OFSB
DECA, DECB, VCMA, VCMB, CCMA, CCMB
Internal Power Dissipation
θJA (With Pad Soldered to Board)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
1.4 W
45.4°C/W
150°C
−40°C to +85°C
−65°C to +150°C
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. A | Page 6 of 28

6 Page









AD8366 pdf, datenblatt
AD8366
300
280
TTTAAA
=
=
=
+85°C
+25°C
–40°C
260
240
220
200
180
160
140
120
100
0 5 10 15 20 25 30 35 40 45 50 55 60
GAIN CODE
Figure 29. Supply Current vs. Gain Code at 10 MHz
30
CHANNEL B, FREQUENCY = 0.5MHz
28
CHANNEL A, FREQUENCY = 0.5MHz
CHANNEL B, FREQUENCY = 3MHz
26
CHANNEL A, FREQUENCY = 3MHz
CHANNEL B, FREQUENCY = 10MHz
CHANNEL A, FREQUENCY = 10MHz
24 CHANNEL B, FREQUENCY = 50MHz
CHANNEL A, FREQUENCY = 50MHz
22
20
18
16
14
12
10
0
5 10 15 20 25 30 35 40 45 50 55 60
GAIN CODE
Figure 30. Noise Figure vs. Gain Code at 0.5 MHz, 3 MHz, 10 MHz, and 50 MHz
280
270
260
250
240
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
A:
A:
B:
A:
A:
B:
A:
A:
B:
RRRRRRCCCIIIIIIIIINNNNNNNNN,,,,,,,,,
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
CODE
CODE
CODE
CODE
CODE
CODE
CODE
CODE
CODE
0
63
32
0
63
32
32
0
63
3.0
2.7
2.4
2.1
1.8
230 1.5
220 1.2
210 0.9
200
190
180
0
0.6
CHANNEL
CHANNEL
CHANNEL
A:
B:
B:
CCCIIINNN,,,
GAIN
GAIN
GAIN
CODE
CODE
CODE
32
0
63
0.3
0
20 40 60 80 100 120 140 160 180 200
FREQUENCY (MHz)
Figure 31. Differential Parallel Input Resistance and Capacitance vs.
Frequency
60 CHANNEL A
55 CHANNEL B
GAIN CODE 63
50 GAIN CODE 47
GAIN CODE 48
45
GAIN CODE 31
GAIN CODE 32
40
GAIN CODE 15
GAIN CODE 16
GAIN CODE 0
35
30
25
20
15
10
0.1 1 10 100
FREQUENCY (kHz)
Figure 32. Noise Spectral Density vs. Frequency
1000
30
28
GAIN CODE 0
26
GAIN CODE 15
GAIN CODE 16
GAIN CODE 31
24 GAIN CODE 32
GAIN CODE 47
22
GAIN CODE 48
GAIN CODE 63
20
CHANNEL A
CHANNEL B
18
16
14
12
10
0.1 1 10 100
FREQUENCY (kHz)
Figure 33. Noise Figure vs. Frequency
1000
40
37
34
31
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
A:
A:
B:
A:
A:
B:
A:
A:
RRRRRLLLOOOOOOOOUUUUUUUUTTTTTTTT,,,,,,,,
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
CODE
CODE
CODE
CODE
CODE
CODE
CODE
CODE
0
63
32
0
63
32
32
0
28
7.5
7.2
6.9
6.6
6.3
25 6.0
22 5.7
19 5.4
16
13
10
CHANNEL
CHANNEL
CHANNEL
CHANNEL
B:
A:
B:
B:
LLLROOOOUUUUTTTT,,,,
GAIN
GAIN
GAIN
GAIN
CODE
CODE
CODE
CODE
63
32
0
63
5.1
4.8
4.5
0 20 40 60 80 100 120 140 160 180 200
FREQUENCY (MHz)
Figure 34. Differential Series Output Resistance and Inductance vs.
Frequency
Rev. A | Page 12 of 28

12 Page





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