Datasheet

LT1993-10
9
199310fb
30MHz 8192 Point FFT, LT1993-10
Driving LT2249 14-Bit ADC
50MHz 8192 Point FFT, LT1993-10
Driving LTC2249 14-Bit ADC
70MHz 8192 Point FFT, LT1993-10
Driving LTC2249 14-Bit ADC
70MHz 2-Tone 32768 Point FFT
LT1993-10 Driving LTC2249
14-Bit ADC
2-Tone WCDMA Waveform
LT1993-10 Driving LTC2255
14-Bit ADC at 92.16Msps
4-Tone WCDMA Waveform
LT1993-10 Driving LTC2255
14-Bit ADC at 92.16Msps
TYPICAL PERFOR A CE CHARACTERISTICS
UW
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
5
10 15 20
199310 G28
30 4025 35
–20
–110
–90
–70
–50
–30
–10
8192 POINT FFT
f
IN
= 30MHz, –1dBFS
FILTERED OUTPUTS
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
5
10 15 20
199310 G30
30 4025 35
–20
–110
–90
–70
–50
–30
–10
8192 POINT FFT
f
IN
= 70MHz, –1dBFS
FILTERED OUTPUTS
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
10
5
15
20 25 30
199310 G31
35 40
–20
–110
–120
–90
–70
–50
–30
–10
32768 POINT FFT
TONE 1 AT 69.5MHz, –7dBFS
TONE 2 AT 70.5MHz, –7dBFS
FILTERED OUTPUTS
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
5
10 15 25
199310 G32
3520 30 40 45
–20
–110
–90
–70
–50
–30
–10
32768 POINT FFT
TONE CENTER FREQUENCIES
AT 67.5MHz, 72.5MHz
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
5
10 15 25
199310 G33
3520 30 40 45
–20
–110
–90
–70
–50
–30
–10
32768 POINT FFT
TONE CENTER FREQUENCIES
AT 62.5MHz, 67.5MHz,
72.5MHz, 77.5MHz
PI FU CTIO S
UUU
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 (Unfi ltered). These
pins are high bandwidth, low-impedance outputs. The DC
output voltage at these pins is set to the voltage applied
at V
OCM
.
FREQUENCY (MHz)
0
–120
AMPLITUDE (dBFS)
–100
–80
–60
–40
0
5
10 15 20
199310 G29
30 4025 35
–20
–110
–90
–70
–50
–30
–10
8192 POINT FFT
f
IN
= 50MHz, –1dBFS
FILTERED OUTPUTS