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Linear Technology Electronic Components Datasheet

LT1994 Datasheet

Low Noise - Low Distortion Fully Differential Input/Output Amplifier/Driver

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FEATURES
Fully Differential Input and Output
Wide Supply Range: 2.375V to 12.6V
Rail-to-Rail Output Swing
Low Noise: 3nV/√Hz
Low Distortion, 2VP-P, 1MHz: –94dBc
Adjustable Output Common Mode Voltage
Unity Gain Stable
Gain-Bandwidth: 70MHz
Slew Rate: 65V/μs
Large Output Current: 85mA
DC Voltage Offset <2mV MAX
Open-Loop Gain: 100V/mV
Low Power Shutdown
8-Pin MSOP or 3mm × 3mm DFN Package
U
APPLICATIO S
Differential Input A/D Converter Driver
Single-Ended to Differential Conversion
Differential Amplification with Common Mode
Translation
Rail-to-Rail Differential Line Driver/Receiver
Low Voltage, Low Noise, Differential Signal
Processing
LT1994www.DataSheet4U.com
Low Noise, Low Distortion
Fully Differential Input/
Output Amplifier/Driver
DESCRIPTIO
The LT®1994 is a high precision, very low noise, low distor-
tion, fully differential input/output amplifier optimized for
3V, single supply operation. The LT1994’s output common
mode voltage is independent of the input common mode
voltage, and is adjustable by applying a voltage on the
VOCM pin. A separate internal common mode feedback
path provides accurate output phase balancing and reduced
even-order harmonics. This makes the LT1994 ideal for
level shifting ground referenced signals for driving dif-
ferential input, single supply ADCs.
The LT1994 output can swing rail-to-rail and is capable
of sourcing and sinking up to 85mA. In addition to the
low distortion characteristics, the LT1994 has a low input
referred voltage noise of 3nV/√Hz. This part maintains
its performance for supply voltages as low as 2.375V. It
draws only 13.3mA of supply current and has a hardware
shutdown feature that reduces current consumption to
225µA.
The LT1994 is available in an 8-pin MSOP or 8-pin DFN
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
A/D Preamplifier: Single-Ended Input to Differential Output with Common
Mode Level Shifting
VIN
2VP-P
499
0.1µF
499
3V
0.1µF
–+
VOCM LT1994
+–
24.9
24.9
47pF
VOCM = 1.5V
3V
10µF
AIN+
VDD SD0
CONV
LTC1403A-1
SCK
AIN–
GND VREF
50.4MHz
10µF
499
499
1994 TA01
LT1994 Driving an LTC1403A-1 1MHz
Sine Wave, 8192 Point FFT Plot
0
–10
FSAMPLE = 2.8Msps
FIN = 1.001MHz
–20 INPUT = 2VP-P,
–30
SINGLE ENDED
SFDR = 93dB
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
0.35 0.70 1.05
FREQUENCY (MHz)
1.40
1994 TA01b
1994fa
1


Linear Technology Electronic Components Datasheet

LT1994 Datasheet

Low Noise - Low Distortion Fully Differential Input/Output Amplifier/Driver

No Preview Available !

LT1994
www.DataSheet4U.com
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V) ..............................12.6V
Input Voltage (Note 2)...............................................±VS
Input Current (Note 2)..........................................±10mA
Input Current (VOCM, SHDN)................................±10mA
VOCM, SHDN .............................................................±VS
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4) ... –40°C to 85°C
UW U
PACKAGE/ORDER I FOR ATIO
Specified Temperature Range (Note 5) .... –40°C to 85°C
Junction Temperature
MS8 .................................................................. 150°C
DFN8................................................................. 125°C
Storage Temperature Range
MS8 ................................................... –65°C to 150°C
DFN8.................................................. –65°C to 125°C
TOP VIEW
IN1
VOCM
V+
OUT+
2
3
4
8 IN+
7 SHDN
6 V
5 OUT
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W
UNDERSIDE METAL CONNECTED TO V
IN1
VOCVM+
2
3
OUT+ 4
TOP VIEW
8 IN+
7 SHDN
6 V
5 OUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 140°C/W
ORDER PART NUMBER DD PART MARKING* ORDER PART NUMBER MS8 PART MARKING*
LT1994CDD
LT1994IDD
LBQM
LBQM
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/
LT1994CMS8
LT1994IMS8
LTBQN
LTBQN
*The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V+ = 3V, V= 0V, VCM = VOCM = VICM = mid-supply, VSHDN = OPEN,
RI = RF = 499Ω, RL = 800Ω to a mid-supply voltage (See Figure 1) unless otherwise noted. VS is defined (V+ – V). VOUTCM is defined
as (VOUT+ + VOUT–)/2. VICM is defined as (VIN+ + VIN–)/2. VOUTDIFF is defined as (VOUT+ – VOUT–). VINDIFF is defined as (VIN+ – VIN–).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VOSDIFF
ΔVOSDIFF/ΔT
IB
Differential Offset Voltage
(Input Referred)
Differential Offset Voltage Drift
(Input Referred)
Input Bias Current
(Note 6)
VS = 2.375V, VICM = VS/4
VS = 3V
VS = 5V
VS = ±5V
VS = 2.375V, VICM = VS/4
VS = 3V
VS = 5V
VS = ±5V
VS = 2.375V, VICM = VS/4
VS = 3V
VS = 5V
VS = ±5V
±2 mV
±2 mV
±2 mV
±3 mV
3 μV/°C
3 μV/°C
3 μV/°C
3 μV/°C
–45
–45
–45
–45
–18
–18
–18
–18
–3
–3
–3
–3
μA
μA
μA
μA
1994fa
2


Part Number LT1994
Description Low Noise - Low Distortion Fully Differential Input/Output Amplifier/Driver
Maker Linear Technology
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LT1994 Datasheet PDF






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