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PDF LT1993-2 Data sheet ( Hoja de datos )
| Número de pieza | LT1993-2 | |
| Descripción | 800MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 800MHz –3dB Bandwidth
■ Fixed Gain of 2V/V (6dB)
■ Low Distortion:
38dBm OIP3, –70dBc HD3 (70MHz, 2VP-P)
51dBm OIP3, –94dBc HD3 (10MHz, 2VP-P)
■ Low Noise: 12.3dB NF, en = 3.8nV/√Hz (70MHz)
■ Differential Inputs and Outputs
■ Additional Filtered Outputs
■ Adjustable Output Common Mode Voltage
■ DC- or AC-Coupled Operation
■ Minimal Support Circuitry Required
■ Small 0.75mm Tall 16-Lead 3 × 3 QFN Package
U
APPLICATIO S
■ Differential ADC Driver for:
Imaging
Communications
■ Differential Driver/Receiver
■ Single Ended to Differential Conversion
■ Differential to Single Ended Conversion
■ Level Shifting
■ IF Sampling Receivers
■ SAW Filter Interfacing/Buffering
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1993-2www.DataSheet4U.com
800MHz Low Distortion, Low
Noise Differential Amplifier/
ADC Driver (AV = 2V/V)
DESCRIPTIO
The LT®1993-2 is a low distortion, low noise Differential
Amplifier/ADC driver for use in applications from DC to
800MHz. The LT1993-2 has been designed for ease of
use, with minimal support circuitry required. Exception-
ally low input-referred noise and low distortion products
(with either single-ended or differential inputs) make the
LT1993-2 an excellent solution for driving high speed 12-
bit and 14-bit ADCs. In addition to the normal unfiltered
outputs (+OUT and –OUT), the LT1993-2 has a built-in
175MHz differential low pass filter and an additional pair
of filtered outputs (+OUTFILTERED, –OUTFILTERED) to
reduce external filtering components when driving high
speed ADCs. The output common mode voltage is easily set
via the VOCM pin, eliminating either an output transformer
or AC-coupling capacitors in many applications.
The LT1993-2 is designed to meet the demanding require-
ments of communications transceiver applications. It can
be used as a differential ADC driver, a general-purpose
differential gain block, or in any other application requir-
ing differential drive. The LT1993-2 can be used in data
acquisition systems required to function at frequencies
down to DC.
The LT1993-2 operates on a 5V supply and consumes
100mA. It comes in a compact 16-lead 3 × 3 QFN package
and operates over a –40°C to 85°C temperature range.
TYPICAL APPLICATIO
4-Channel WCDMA Receive Channel
70MHz
IF IN
1:4 0.1µF
Z-RATIO
0.1µF
MINI-CIRCUITS
TCM4-19
–INB
–OUT
–INA
–OUTFILTERED
LT1993-2
+INB
+INA
+OUTFILTERED
+OUT
VOCM
ENABLE
2.2V
12.2Ω
AIN–
82nH 52.3pF
LTC2255
ADC
AIN+
12.2Ω
LTC2255 125Msps
14-BIT ADC SAMPLING
AT 92.16Msps
19932 TA01a
4-Tone WCDMA Waveform,
LT1993-2 Driving LTC2255 14-Bit
ADC at 92.16Msps
0 32768 POINT FFT
–10 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)
19932 TA01b
19932fa
1
1 page  
LT1993-2www.DataSheet4U.com
AC ELECTRICAL CHARACTERISTICS TA = 25°C, VCCA = VCCB = VCCC = 5V, VEEA = VEEB = VEEC = 0V,
ENABLE = 0.8V, +INA shorted to +INB (+IN), –INA shorted to –INB (–IN), VOCM = 2.2V, Input common mode voltage = 2.2V, no RLOAD
unless otherwise noted.
SYMBOL
PARAMETER
Third-Order IMD
OIP350M
NF
Output Third-Order Intercept
Noise Figure
CONDITIONS
3.2VP-P Differential (+OUT, –OUT), RL = 100Ω
2VP-P Differential Composite (+OUTFILTERED,
–OUTFILTERED), f1 = 49.5MHz, f2 = 50.5MHz
2VP-P Differential Composite (+OUT, –OUT),
RL = 100Ω, f1 = 49.5MHz, f2 = 50.5MHz
3.2VP-P Differential Composite (+OUTFILTERED,
–OUTFILTERED), f1 = 49.5MHz, f2 = 50.5MHz
Differential (+OUTFILTERED, –OUTFILTERED),
f1 = 49.5MHz, f2 = 50.5MHz
Measured Using DC800A Demo Board
MIN TYP MAX UNITS
–65 dBc
–84 dBc
–88 dBc
–75 dBc
45 dBm
11.8 dB
en50M
70MHz Signal
Input Referred Noise Voltage Density
1dB Compression Point
RL = 100Ω
3.65 nV/√Hz
19.7 dBm
OIP370M
NF
Second/Third Harmonic Distortion
Third-Order IMD
Output Third-Order Intercept
Noise Figure
2VP-P Differential (+OUTFILTERED, –OUTFILTERED)
2VP-P Differential (+OUT, –OUT)
2VP-P Differential (+OUT, –OUT), RL = 100Ω
2VP-P Differential Composite (+OUTFILTERED,
–OUTFILTERED), f1 = 69.5MHz, f2 = 70.5MHz
2VP-P Differential Composite (+OUT, –OUT),
RL = 100Ω, f1 = 69.5MHz, f2 = 70.5MHz
Differential (+OUTFILTERED, –OUTFILTERED),
f1 = 69.5MHz, f2 = 70.5MHz
Measured Using DC800A Demo Board
–70
–61
–61
–70
–72
38
12.3
dBc
dBc
dBc
dBc
dBc
dBm
dB
en70M
Input Referred Noise Voltage Density
1dB Compression Point
100MHz Signal
RL = 100Ω
3.8 nV/√Hz
18.5 dBm
OIP3100M
NF
Second/Third Harmonic Distortion
Third-Order IMD
Output Third-Order Intercept
Noise Figure
2VP-P Differential (+OUTFILTERED, –OUTFILTERED)
2VP-P Differential (+OUT, –OUT)
2VP-P Differential (+OUT, –OUT), RL = 100Ω
2VP-P Differential Composite (+OUTFILTERED,
–OUTFILTERED), f1 = 99.5MHz, f2 = 100.5MHz
2VP-P Differential Composite (+OUT, –OUT),
RL = 100Ω, f1 = 99.5MHz, f2 = 100.5MHz
Differential (+OUTFILTERED, –OUTFILTERED),
f1 = 99.5MHz, f2 = 100.5MHz
Measured Using DC800A Demo Board
–56
–54
–51
–58
–59
32
12.8
dBc
dBc
dBc
dBc
dBc
dBm
dB
en100M
Input Referred Noise Voltage Density
1dB Compression Point
RL = 100Ω
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: As long as output current and junction temperature are kept below
the Absolute Maximum Ratings, no damage to the part will occur.
Note 3: The LT1993C-2 is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 4: The LT1993C-2 is guaranteed to meet specified performance from
4.1 nV/√Hz
17.8 dBm
0°C to 70°C. It is designed, characterized and expected to meet specified
performance from –40°C and 85°C but is not tested or QA sampled
at these temperatures. The LT1993I-2 is guaranteed to meet specified
performance from –40°C to 85°C.
Note 5: This parameter is pulse tested.
Note 6: This parameter is guaranteed to meet specified performance
through design and characterization. It has not been tested.
19932fa
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5 Page 
TYPICAL PERFOR A CE CHARACTERISTICS
LT1993-2www.DataSheet4U.com
30MHz 8192 Point FFT, LT1993-2
Driving LTC2249 14-Bit ADC
0 8192 POINT FFT
–10 fIN = 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)
19932 G46
70MHz 2-Tone 32768 Point FFT,
LT1993-2 Driving LTC2249
14-Bit ADC
0 32768 POINT FFT
–10 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)
19932 G49
50MHz 8192 Point FFT, LT1993-2
Driving LTC2249 14-Bit ADC
0 8192 POINT FFT
–10 fIN = 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)
19932 G47
2-Tone WCDMA Waveform,
LT1993-2 Driving LTC2255 14-Bit
ADC at 92.16Msps
0 32768 POINT FFT
–10 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)
19932 G50
70MHz 8192 Point FFT, LT1993-2
Driving LTC2249 14-Bit ADC
0 8192 POINT FFT
–10 fIN = 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)
19932 G48
4-Tone WCDMA Waveform,
LT1993-2 Driving LTC2255 14-Bit
ADC at 92.16Msps
0 32768 POINT FFT
–10 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)
19932 G51
19932fa
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT1993-2.PDF ] | |
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