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PDF AD8370 Data sheet ( Hoja de datos )
| Número de pieza | AD8370 | |
| Descripción | Digitally Controlled VGA | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
Programmable low and high gain (<2 dB resolution)
Low range: −11 dB to +17 dB
High range: 6 dB to 34 dB
Differential input and output
200 Ω differential input
100 Ω differential output
7 dB noise figure @ maximum gain
Two-tone IP3 of 35 dBm @ 70 MHz
−3 dB bandwidth of 750 MHz
40 dB precision gain range
Serial 8-bit digital interface
Wide input dynamic range
Power-down feature
Single 3 V to 5 V supply
APPLICATIONS
Differential ADC drivers
IF sampling receivers
RF/IF gain stages
Cable and video applications
SAW filter interfacing
Single-ended-to-differential conversion
GENERAL DESCRIPTION
The AD8370 is a low cost, digitally controlled, variable gain
amplifier (VGA) that provides precision gain control, high IP3,
and low noise figure. The excellent distortion performance and
wide bandwidth make the AD8370 a suitable gain control
device for modern receiver designs.
For wide input, dynamic range applications, the AD8370 provides
two input ranges: high gain mode and low gain mode. A vernier,
7-bit, transconductance (gm) stage provides 28 dB of gain range
at better than 2 dB resolution and 22 dB of gain range at better than
1 dB resolution. A second gain range, 17 dB higher than the first,
can be selected to provide improved noise performance.
The AD8370 is powered on by applying the appropriate logic
level to the PWUP pin. When powered down, the AD8370
consumes less than 4 mA and offers excellent input to output
isolation. The gain setting is preserved when operating in a
power-down mode.
LF to 750 MHz,
Digitally Controlled VGA
AD8370
FUNCTIONAL BLOCK DIAGRAM
VCCI
3
VCCO VCCO
11 6
PWUP 4
ICOM 2
INHI 1
INLO 16
PRE
AMP
BIAS CELL
TRANSCONDUCTANCE
OUTPUT
AMP
5 VOCM
7 OCOM
8 OPHI
9 OPLO
ICOM 15
SHIFT REGISTER
AND LATCHES
14 13 12
DATA CLCK LTCH
Figure 1.
10 OCOM
AD8370
70
CODE = LAST 7 BITS OF GAIN CODE
(NO MSB)
60
HIGH GAIN MODE
50
LOW GAIN MODE
40
HIGH GAIN MODE
30
40
30
20
GAIN 0.409
CODE
10
0
20 –10
10
LOW GAIN MODE
GAIN 0.059
CODE
–20
0 –30
0 10 20 30 40 50 60 70 80 90 100 110 120 130
GAIN CODE
Figure 2. Gain vs. Gain Code at 70 MHz
Gain control of the AD8370 is through a serial 8-bit gain control
word. The MSB selects between the two gain ranges, and the
remaining 7 bits adjust the overall gain in precise linear gain steps.
Fabricated on the ADI high speed XFCB process, the high
bandwidth of the AD8370 provides high frequency and low
distortion. The quiescent current of the AD8370 is 78 mA
typically. The AD8370 amplifier comes in a compact, thermally
enhanced 16-lead TSSOP package and operates over the
temperature range of −40°C to +85°C.
Rev. B
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 © 2005-2011 Analog Devices, Inc. All rights reserved.
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Supply Voltage, VS
PWUP, DATA, CLCK, LTCH
Differential Input Voltage,
VINHI – VINLO
Common-Mode Input Voltage,
VINHI or VINLO, with Respect to
ICOM or OCOM
Internal Power Dissipation
θJA (Exposed Paddle Soldered Down)
θJA (Exposed Paddle Not Soldered Down)
θJC (At Exposed Paddle)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range
(Soldering 60 sec)
5.5 V
VS + 500 mV
2V
VS + 500 mV (max),
VICOM – 500 mV,
VOCOM – 500 mV (min)
575 mW
30°C/W
95°C/W
9°C/W
150°C
−40°C to +85°C
−65°C to +150°C
235°C
AD8370
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 listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate
on the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. B | Page 5 of 28
5 Page 
Data Sheet
80
70
LG32, LG127
60
HG32, HG127
50
40
30
20
10
0
10 100 1000
FREQUENCY (MHz)
Figure 28. Common-Mode Rejection Ratio vs. Frequency
12
10
8
LG127
6
4
HG18
2
HG127
0
10 110 210 310 410 510 610
FREQUENCY (MHz)
Figure 29. Input Referred Noise Spectral Density vs.
Frequency at Various Gains
VOPHI
VOPLO
GND
DIFFERENTIAL VOUT
DIFFERENTIAL VIN
TIME (2ns/DIV)
Figure 30. DC-Coupled Large Signal Pulse Response
DIFFERENTIAL OUTPUT (50mV/DIV)
ZERO
AD8370
PWUP (2V/DIV)
GAIN CODE HG127
GND
INPUT = –30dBm, 70MHz 100 AVERAGES
TIME (40ns/DIV)
Figure 31. PWUP Time Domain Response
DIFFERENTIAL OUTPUT (10mV/DIV)
ZERO
LTCH (2V/DIV)
6dB GAIN STEP (HG36 TO LG127)
GND
INPUT = –30dBm, 70MHz
NO AVERAGING
TIME (20ns/DIV)
Figure 32. Gain Step Time Domain Response
VOUT DIFFERENTIAL
GND
TIME (2ns/DIV)
Figure 33. Overdrive Recovery
Rev. B | Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AD8370.PDF ] | |
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