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High-Speed Amplifiers<br />
LMH6553 – 900 MHz Fully Differential Amplifier With Output Limiting Clamp<br />
Features<br />
• 900 MHz small signal gain of 1 bandwidth<br />
• 670 MHz large signal gain of 1 bandwidth<br />
• Integrated adjustable output limiting clamp protects low voltage<br />
ADC inputs from overload<br />
• 600 ps clamp overdrive recovery time<br />
• 10 ns settling time to 0.1%<br />
• -79 dB THD at 20 MHz<br />
• 4.5 to 12V operation<br />
• Ideal match to National’s 8/10/12/14-bit high-speed ADCs<br />
V S<br />
R S = 50Ω<br />
R T<br />
R M<br />
Single-Ended Input Differential Output ADC Driver<br />
275Ω<br />
275Ω<br />
+<br />
-<br />
275Ω<br />
V+<br />
LMH6553<br />
275Ω<br />
V-<br />
R O<br />
R O<br />
Vclamp<br />
V IN+<br />
V IN-<br />
ADC<br />
8 to 14 Bit<br />
V CM<br />
LMH6555 – 1.2 GHz Low-Distortion Differential Driver<br />
Features<br />
R F1<br />
• 1.2 GHz bandwidth<br />
• -50.5 dBc THD at 750 MHz<br />
• 15 dB noise figure<br />
• 13.7 dB fixed gain<br />
• 3.3V operation<br />
• 1300 V/μs slew rate<br />
• Ideal match for 8-bit ADCs up to 3 GSPS, such as the<br />
ADC08(D)1000/1500/3000 family<br />
• Available in LLP-16 packaging<br />
R S1<br />
340 mV PP 50Ω V IN +<br />
V IN<br />
R S2<br />
50Ω<br />
V IN -<br />
R G1<br />
R G2<br />
LMH6555<br />
+<br />
–<br />
R F2<br />
R T2<br />
50Ω<br />
R T1<br />
50Ω<br />
V CM_REF<br />
OPT<br />
V OUT = 0.8 V PP<br />
V OUT +<br />
ADC081000/<br />
ADC081500<br />
3.3V<br />
+<br />
LMV321<br />
–<br />
V CMO<br />
OPT<br />
SPI<br />
LMH6554 – 2.5 GHz Ultra Linear Fully-Differential Amplifier<br />
Features<br />
• 2.5 GHz small signal gain of 1 bandwidth<br />
• 1.8 GHz large signal gain of 1 bandwidth<br />
• 800 MHz 0.1 dB gain flatness<br />
• -99 dBc IMD3 at f = 150 MHz<br />
• 72 dBc SFDR at f = 250 MHz<br />
• 0.9 nV/√Hz input noise voltage<br />
• 11 pA/√Hz input noise current<br />
• 4.7V to 5.3V operation<br />
• Available in quad FCOL-14 packaging<br />
• Ideal match to National’s new ADC10D1000 1 GSPS dual ADC and<br />
ADC16V130 130 MSPS 16-bit ADC<br />
R S = 50Ω<br />
V S<br />
28Ω<br />
0.1 μF<br />
AC Coupled, Single to Differential ADC Driver<br />
0.1 μF<br />
61.9Ω<br />
0.1μF<br />
191Ω<br />
90Ω<br />
EN<br />
200Ω<br />
-<br />
V +<br />
+<br />
LMH6554<br />
+<br />
-<br />
V -<br />
200Ω<br />
50Ω<br />
50Ω<br />
10pF<br />
ADC16V130<br />
16-Bit<br />
130<br />
MSPS<br />
V REF<br />
34
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