(ADA4950-1/-2) Low Power Selectable Gain Differential ADC Driver
Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3 ADA4950-1/ADA4950-2
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High pe...
Description
Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3 ADA4950-1/ADA4950-2
FEATURES www.datasheet4u.com
High performance at low power High speed −3 dB bandwidth of 750 MHz, G = 1 0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω Slew rate: 2900 V/μs, 25% to 75% Fast 0.1% settling time of 9 ns Low power: 9.5 mA per amplifier Low harmonic distortion 108 dB SFDR @ 10 MHz 98 dB SFDR @ 20 MHz Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO ±0.2 mV typical input offset voltage Selectable differential gains of 1, 2, and 3 Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Input common-mode range shifted down by 1 VBE Wide supply range: +3 V to ±5 V Available in 16-lead and 24-lead LFCSP packages
FUNCTIONAL BLOCK DIAGRAMS
16 –VS 15 –VS 13 –VS
12 PD 11 –OUT 10 +OUT 9 VOCM
+INB 1 +INA 2 –INA 3 +INB 4
ADA4950-1
14 –VS +VS 7
+VS 8
+VS 5
Figure 1. ADA4950-1
+INA1 +INB1 –VS1 –VS1 PD1 –OUT1
–INA1 –INB1 +VS1 +VS1 +INB2 +INA2
1 2 3 4 5 6
24 23 22 21 20 19
+VS 6
ADA4950-2
18 17 16 15 14 13
+OUT1 VOCM1 –VS2 –VS2 PD2 –OUT2
HARMONIC DISTORTION (dBc)
ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers
Figure 2. ADA4950-2
–40 –50 –60 –70 –80 –90 –100 –110 –120 –130 1 10 FREQUENCY (MHz) 100
07957-025
VOUT, dm = 2V p-p
GENERAL DESCRIPTION
The ADA4950-1/ADA4950-2 are gain-selectable versions of the ADA4932-1/ADA4932-2 with on-chip feedback an...
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