LT1993-10_15 Datasheet, PDF (9/16 Pages) Linear Technology – 700MHz Low Distortion, Low Noise Differential Amplifier/ ADC Driver

TYPICAL PERFOR A CE CHARACTERISTICS
LT1993-10
30MHz 8192 Point FFT, LT1993-10
Driving LT2249 14-Bit ADC
0
–10
8192 POINT FFT
f_IN = 30MHz, –1dBFS
–20 _{FILTERED OUTPUTS}
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30 35 40
FREQUENCY (MHz)
199310 G28
70MHz 2-Tone 32768 Point FFT
LT1993-10 Driving LTC2249
14-Bit ADC
0
–10
32768 POINT FFT
TONE 1 AT 69.5MHz, –7dBFS
–20
TONE 2 AT 70.5MHz, –7dBFS
–30
FILTERED OUTPUTS
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30 35 40
FREQUENCY (MHz)
199310 G31
50MHz 8192 Point FFT, LT1993-10
Driving LTC2249 14-Bit ADC
0
–10
8192 POINT FFT
f_IN = 50MHz, –1dBFS
–20 _{FILTERED OUTPUTS}
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30 35 40
FREQUENCY (MHz)
199310 G29
2-Tone WCDMA Waveform
LT1993-10 Driving LTC2255
14-Bit ADC at 92.16Msps
0
–10
32768 POINT FFT
TONE CENTER FREQUENCIES
–20 _{AT 67.5MHz, 72.5MHz}
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30 35 40 45
FREQUENCY (MHz)
199310 G32
70MHz 8192 Point FFT, LT1993-10
Driving LTC2249 14-Bit ADC
0
–10
8192 POINT FFT
f_IN = 70MHz, –1dBFS
–20
FILTERED OUTPUTS
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30 35 40
FREQUENCY (MHz)
199310 G30
4-Tone WCDMA Waveform
LT1993-10 Driving LTC2255
14-Bit ADC at 92.16Msps
0
–10
32768 POINT FFT
TONE CENTER FREQUENCIES
–20 _{AT 62.5MHz, 67.5MHz,}
–30 ^{72.5MHz, 77.5MHz}
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20 25 30 35 40 45
FREQUENCY (MHz)
199310 G33
PI FU CTIO S
V_OCM (Pin 2): This pin sets the output common mode
voltage. Without additional biasing, both inputs bias to
this voltage as well. This input is high impedance.
V_CCA, V_CCB, V_CCC (Pins 3, 10, 1): Positive Power Supply
(Normally Tied to 5V). All three pins must be tied to the
same voltage. Bypass each pin with 1000pF and 0.1µF
capacitors as close to the package as possible. Split
supplies are possible as long as the voltage between V_CC
and V_EE is 5V.
V_EEA, V_EEB, V_EEC (Pins 4, 9, 12): Negative Power Supply
(Normally Tied to Ground). All three pins must be tied to
the same voltage. Split supplies are possible as long as
the voltage between V_CC and V_EE is 5V. If these pins are
not tied to ground, bypass each pin with 1000pF and 0.1µF
capacitors as close to the package as possible.
+OUT, –OUT (Pins 5, 8): Outputs (Unfiltered). These
pins are high bandwidth, low-impedance outputs. The DC
output voltage at these pins is set to the voltage applied
at V_OCM.
199310fb
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