Datasheet AD8375 (Analog Devices)

Ultralow Distortion IF VGA Data Sheet AD8375 FEATURES FUNCTIONAL BLOCK DIAGRAM VPOS COMM Bandwidth of 630 MHz (−3 dB) Gain range: −4 dB to +20 dB VCOM PWUP Step size: 1 dB ± 0.2 dB AD8375 Differential input and output OUT+ Noise figure: 8 dB @ maximum gain VIN+ OUT+ Output IP3 of ~50 dBm at 200 MHz POST-AMP
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Output P1dB of 19 dBm at 200 MHz VIN– OUT– Provides constant SFDR vs. gain OUT– Parallel 5-bit control interface Power-down feature REGISTERS AND Single 5 V supply operation GAIN DECODER 24-lead, 4 mm × 4 mm LFCSP
1 -00
APPLICATIONS
24
A4 A3 A2 A1 A0
067
Differential ADC drivers
Figure 1.
High IF sampling receivers Wideband multichannel receivers Instrumentation GENERAL DESCRIPTION
The AD8375 is a digitally controlled, variable gain, wide Fabricated on an Analog Devices, Inc., high speed SiGe process, bandwidth amplifier that provides precise gain control, high the AD8375 is supplied in a compact, thermally enhanced, IP3, and low noise figure. The excellent distortion performance 4 mm × 4 mm, 24-lead LFCSP package and operates over the and high signal bandwidth make the AD8375 an excellent gain temperature range of −40°C to +85°C. control device for a variety of receiver applications.
–40 65 -p p
Using an advanced high speed SiGe process and incorporating
–50 60 E
proprietary distortion cancellation techniques, the AD8375
@ 2V N T U O
achieves 50 dBm output IP3 at 200 MHz.
P /T T –60 55 U Bm
The AD8375 provides a broad 24 dB gain range with 1 dB
, O OIP3 3d Bc) –70 50 @
resolution. The gain is adjusted through a 5-pin control interface
d ( UT N P
and can be driven using standard TTL levels. The open-collector
T IO –80 45 U T
outputs provide a flexible interface, allowing the overall signal
R O ), O T HD2
gain to be set by the loading impedance. Thus, the signal
S –90 40 Bm d DI 3 (
voltage gain is directly proportional to the load.
IC N HD3 IP O –100 35 O
The AD8375 is powered on by applying the appropriate logic level to the PWUP pin. The quiescent current of the AD8375 is
HARM –110 30
52
40 60 80 100 120 140 160 180 200
0 4- typically 130 mA. When powered down, the AD8375 consumes
FREQUENCY (MHz)
72 06 less than 5 mA and offers excellent input-to-output isolation. Figure 2. Harmonic Distortion and Output IP3 vs. Frequency
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT DESCRIPTION BASIC STRUCTURE Input System Output Amplifier Gain Control APPLICATIONS BASIC CONNECTIONS SINGLE-ENDED-TO-DIFFERENTIAL CONVERSION BROADBAND OPERATION ADC INTERFACING LAYOUT CONSIDERATIONS CHARACTERIZATION TEST CIRCUITS Differential-to-Differential Characterization EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE