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Linear Technology Electronic Components Datasheet

LT1993-2 Datasheet

800MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver

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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
12.2
AIN–
82nH 52.3pF
LTC2255
ADC
AIN+
12.2
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


Linear Technology Electronic Components Datasheet

LT1993-2 Datasheet

800MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver

No Preview Available !

LT1993-2
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (VCCA/VCCB/VCCC to
VEEA/VEEB/VEEC) ...................................................5.5V
Input Current (+INA, –INA, +INB, –INB,
VOCM, ENABLE)................................................±10mA
Output Current (Continuous) (Note 6)
+OUT, –OUT (DC) ..........................................±100mA
(AC) ..........................................±100mA
+OUTFILTERED, –OUTFILTERED (DC) .............±15mA
(AC) .............±45mA
Output Short Circuit Duration (Note 2) ............ Indefinite
Operating Temperature Range (Note 3) ... –40°C to 85°C
Specified Temperature Range (Note 4) .... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Junction Temperature ........................................... 125°C
Lead Temperature Range (Soldering 10 sec) ........ 300°C
www.DataSheet4U.com
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
VCCC 1
12 VEEC
VOCM 2 17 11 ENABLE
VCCA 3
10 VCCB
VEEA 4
9 VEEB
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W, θJC = 4.2°C/W
EXPOSED PAD IS VEE (PIN 17) MUST BE SOLDERED TO THE PCB
ORDER PART NUMBER UD PART MARKING*
LT1993CUD-2
LT1993IUD-2
LBJG
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
DC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at 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
CONDITIONS
MIN TYP MAX UNITS
Input/Output Characteristics (+INA, +INB, –INA, –INB, +OUT, –OUT, +OUTFILTERED, –OUTFILTERED)
GDIFF
Gain
VSWINGMIN
VSWINGMAX
VSWINGDIFF Output Voltage Swing
IOUT Output Current Drive
VOS Input Offset Voltage
Differential (+OUT, –OUT), VIN = ±0.8V Differential
Single-Ended +OUT, –OUT, +OUTFILTERED,
–OUTFILTERED. VIN = ±2.2V Differential
Single-Ended +OUT, –OUT, +OUTFILTERED,
–OUTFILTERED. VIN = ±2.2V Differential
Differential (+OUT, –OUT), VIN = ±2.2V
Differential
5.8
3.6
3.5
6.5
6
6.08 6.3
0.25 0.35
0.5
3.75
7
(Note 5)
±40
±45
–6.5
–10
1
6.5
10
dB
V
V
V
V
VP-P
VP-P
mA
mV
mV
TCVOS
IVRMIN
IVRMAX
RINDIFF
CINDIFF
CMRR
Input Offset Voltage Drift
Input Voltage Range, MIN
Input Voltage Range, MAX
Differential Input Resistance
Differential Input Capacitance
Common Mode Rejection Ratio
TMIN to TMAX
Single-Ended
Single-Ended
Input Common Mode –0.1V to 5.1V
2.5
µV/°C
–0.1 V
5.1
V
170 200 240
Ω
1 pF
45
70
dB
19932fa
2


Part Number LT1993-2
Description 800MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver
Maker Linear Technology
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LT1993-2 Datasheet PDF






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