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Linear Technology Electronic Components Datasheet

LT1993-4 Datasheet

900MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver

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FEATURES
900MHz –3dB Bandwidth
Fixed Gain of 4V/V (12dB)
Low Distortion:
40dBm OIP3, –73dBc HD3 (70MHz 2VP-P)
51dBm OIP3, –94dBc HD3 (10MHz 2VP-P)
Low Noise: 14.5dB NF, en = 2.35nV/√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.
LT1993-4www.DataSheet4U.com
900MHz Low Distortion, Low
Noise Differential Amplifier/
ADC Driver (AV = 4V/V)
DESCRIPTIO
The LT®1993-4 is a low distortion, low noise Differential
Amplifier/ADC driver for use in applications from DC to
900MHz. The LT1993-4 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
LT1993-4 an excellent solution for driving high speed 12-
bit and 14-bit ADCs. In addition to the normal unfiltered
outputs (+OUT and –OUT), the LT1993-4 has a built-in
175MHz differential lowpass 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 LT1993-4 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 LT1993-4 can be used in data
acquisition systems required to function at frequencies
down to DC.
The LT1993-4 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
ADC Driver with Single-Ended to Differential Conversion
70MHz
IF IN
1:1 0.1µF
Z-RATIO
100
MA/COM
ETC1-1-13 0.1µF
–INB
–INA
–OUT
–OUTFILTERED
LT1993-4
+INB
+INA
+OUTFILTERED
+OUT
VOCM
ENABLE
2.2V
12.2
AIN–
82nH 52.3pF
LTC2255
ADC
12dB GAIN
AIN+
12.2
LTC2255 125Msps
14-BIT ADC SAMPLING
AT 92.16Msps
19934 TA01
4-Tone WCDMA Waveform,
LT1993-4 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)
LT19934 TA02
19934fa
1


Linear Technology Electronic Components Datasheet

LT1993-4 Datasheet

900MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver

No Preview Available !

LT1993-4
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
VOCM 2
VCCA 3
VEEA 4
12 VEEC
11 ENABLE
17
10 VCCB
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-4
LBNS
LT1993IUD-4
LBNS
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
VSWINGMIN
VSWINGMAX
VSWINGDIFF
IOUT
VOS
Gain
Output Voltage Swing
Output Current Drive
Input Offset Voltage
Differential (+OUT, –OUT), VIN = ±0.4V Differential 11.6 11.9 12.4
Single-Ended +OUT, –OUT, +OUTFILTERED,
–OUTFILTERED. VIN = ±1.2V Differential
0.25 0.35
0.5
Single-Ended +OUT, –OUT, +OUTFILTERED,
–OUTFILTERED. VIN = ±1.2V Differential
3.6
3.5
3.75
Differential (+OUT, –OUT), VIN = ±1.2VP-P
Differential
6.5
6
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
Input Offset Voltage Drift
Input Voltage Range, MIN
Input Voltage Range, MAX
Differential Input Resistance
Differential Input Capacitance
TMIN to TMAX
Single-Ended
Single-Ended
2.5
µV/°C
0.5 V
4.3
V
77 100 122
Ω
1 pF
19934fa
2


Part Number LT1993-4
Description 900MHz Low Distortion - Low Noise Differential Amplifier/ADC Driver
Maker Linear Technology
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LT1993-4 Datasheet PDF





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