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PDF AD8366 Data sheet ( Hoja de datos )
| Número de pieza | AD8366 | |
| Descripción | Dual-Digital Variable Gain Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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.
1 page  
PARALLEL AND SERIAL INTERFACE TIMING
CS
SCLK
SDAT X
t1 t2
t5 t6
B-LSB
SENB
t3
B-MSB
A-LSB
ALWAYS HIGH
Figure 2. SPI Port Timing Diagram
t4
A-MSB
X
BIT[5:0]
DENA
DENB
SENB
GAIN A
t9 t10
t7
GAIN B
GAIN A, GAIN B
t8
ALWAYS LOW
Figure 3. Parallel Port Timing Diagram
AD8366
Rev. A | Page 5 of 28
5 Page 
60
50
40
30
20
10
TTTAAA
=
=
=
+85°C
+25°C
–40°C
0
GAIN CODE 0
GAIN CODE 63
–3 –2 –1
0
1
2
3
4
5
POUT PER TONE (dBm)
Figure 23. OIP3 vs. Output Power (POUT) at Minimum and Maximum Gain
Codes, 10 MHz Frequency
100
90
80
70
60
50
40
30
20
10
TTTAAA
=
=
=
+85°C
+25°C
–40°C
0
–8 –7 –6 –5 –4 –3 –2 –1
0
GAIN CODE 0
GAIN CODE 63
1234
5
POUT PER TONE (dBm)
Figure 24. OIP2 vs. Output Power (POUT) at Minimum and Maximum Gain
Codes, 10 MHz Frequency
–60
–65
TTTAAA
=
=
=
+85°C
+25°C
–40°C
–70
GAIN CODE 0
GAIN CODE 63
–75
–80
–85
–90
–95
–100
–105
–110
–5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8
POUT (dBm)
Figure 25. HD2 vs. Output Power (POUT) at Gain Code 0 and Gain Code 63,
10 MHz Frequency
AD8366
0
–10
TTTAAA
=
=
=
+85°C
+25°C
–40°C
–20
GAIN CODE 0
GAIN CODE 63
–30
–40
–50
–60
–70
–80
–90
–100
–110
–3 –2 –1
0
1
2
3
4
5
POUT PER TONE (dBm)
Figure 26. IMD3 vs. Output Power (POUT) at Minimum-to-Maximum Gain
Codes, 10 MHz Frequency
0
–10
TTTAAA
=
=
=
+85°C
+25°C
–40°C
–20
GAIN CODE 0
GAIN CODE 63
–30
–40
–50
–60
–70
–80
–90
–100
–8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5
POUT PER TONE (dBm)
Figure 27. IMD2 vs. Output Power (POUT) at Minimum and Maximum Gain
Codes, 10 MHz Frequency
–60
–65
TTTAAA
=
=
=
+85°C
+25°C
–40°C
–70
GAIN CODE 0
GAIN CODE 63
–75
–80
–85
–90
–95
–100
–105
–110
–115
–120
–5 –4 –3 –2 –1 0 1 2 3 4 5
POUT (dBm)
Figure 28. HD3 vs. Output Power (POUT) for Gain Code 0 and Gain Code 63,
10 MHz Frequency
Rev. A | Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AD8366.PDF ] | |
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