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LT1994IDD#TRPBF

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1
1994fb
LT1994
Low Noise, Low Distortion
Fully Differential Input/
Output Amplifi er/Driver
The LT
®
1994 is a high precision, very low noise, low distor-
tion, fully differential input/output amplifi er 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
V
OCM
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.
n
Differential Input A/D Converter Driver
n
Single-Ended to Differential Conversion
n
Differential Amplifi cation with Common Mode
Translation
n
Rail-to-Rail Differential Line Driver/Receiver
n
Low Voltage, Low Noise, Differential Signal
Processing
n
Fully Differential Input and Output
n
Wide Supply Range: 2.375V to 12.6V
n
Rail-to-Rail Output Swing
n
Low Noise: 3nV/√Hz
n
Low Distortion, 2V
P-P
, 1MHz: –94dBc
n
Adjustable Output Common Mode Voltage
n
Unity-Gain Stable
n
Gain-Bandwidth: 70MHz
n
Slew Rate: 65V/s
n
Large Output Current: 85mA
n
DC Voltage Offset <2mV Max
n
Open-Loop Gain: 100V/mV
n
Low Power Shutdown
n
8-Pin MSOP or 3mm × 3mm DFN Package
A/D Preamplifi er: Single-Ended Input to Differential Output
with Common Mode Level Shifting
LT1994 Driving an LTC1403A-1 1MHz
Sine Wave, 8192 Point FFT Plot
TYPICAL APPLICATION
DESCRIPTION
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
1994 TA01
24.9
3V
0.1µF
24.9
47pF
499
499
499
499
3V
10µF
10µF
0.1µF
V
IN
2V
P-P
V
OCM
= 1.5V
GND
V
DD
A
IN
–
A
IN
+
V
REF
CONV
SD0
SCK 50.4MHz
LTC1403A-1
+
–
–
+
LT1994V
OCM
FREQUENCY (MHz)
0
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
DIFFERENTIAL OUTPUT MAGNITUDE (dB)
0
0.35 0.70
1994 TA01b
1.401.05
f
SAMPLE
= 2.8Msps
f
IN
= 1.001MHz
INPUT = 2V
P-P
,
SINGLE ENDED
SFDR = 93dB
LT1994
2
1994fb
Total Supply Voltage (V
+
to V
–
) ..............................12.6V
Input Voltage (Note 2) ...............................................±V
S
Input Current (Note 2) ..........................................±10mA
Input Current (V
OCM
, SHDN) ................................±10mA
V
OCM
, SHDN..............................................................±V
S
Output Short-Circuit Duration (Note 3) ............ Indefi nite
Operating Temperature Range (Note 4)
LT1994C ............................................... –40°C to 85°C
LT1994I ................................................ –40°C to 85°C
LT1994H ............................................ –40°C to 125°C
LT1994MP.......................................... –55°C to 125°C
Specifi ed Temperature Range (Note 5)
LT1994C ................................................... 0°C to 70°C
LT1994I ................................................ –40°C to 85°C
LT1994H ............................................ –40°C to 125°C
LT1994MP.......................................... –55°C to 125°C
Junction Temperature ........................................... 150°C
Storage Temperature Range ................... –65°C to 150°C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1994CDD#PBF LT1994CDD#TRPBF LBQM
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT1994IDD#PBF LT1994IDD#TRPBF LBQM
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LT1994HDD#PBF LT1994HDD#TRPBF LBQM
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT1994MPDD#PBF LT1994MPDD#TRPBF LDXQ
8-Lead (3mm × 3mm) Plastic DFN
–55°C to 125°C
LT1994CMS8#PBF LT1994CMS8#TRPBF LTBQN 8-Lead Plastic MSOP 0°C to 70°C
LT1994IMS8#PBF LT1994IMS8#TRPBF LTBQN 8-Lead Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
TOP VIEW
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1IN
–
V
OCM
V
+
OUT
+
IN
+
SHDN
V
–
OUT
–
T
JMAX
= 150°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO V
–
1
2
3
4
IN
–
V
OCM
V
+
OUT
+
8
7
6
5
IN
+
SHDN
V
–
OUT
–
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 140°C/W
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(Note 1)
3
1994fb
LT1994
SYMBOL PARAMETER CONDITIONS
C/I GRADES H/MP GRADES
UNITSMIN TYP MAX MIN TYP MAX
V
OSDIFF
Differential Offset Voltage
(Input Referred)
V
S
= 2.375V, V
ICM
= V
S
/4
V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
l
±2
±2
±2
±3
±2
±2
±2
±3
mV
mV
mV
mV
ΔV
OSDIFF
/ΔT
Differential Offset Voltage Drift
(Input Referred)
V
S
= 2.375V, V
ICM
= V
S
/4
V
S
= 3V
V
S
= 5V
V
S
= ±5V
3
3
3
3
V/°C
V/°C
V/°C
V/°C
I
B
Input Bias Current (Note 6) V
S
= 2.375V, V
ICM
= V
S
/4
V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
l
–45
–45
–45
–45
–18
–18
–18
–18
–3
–3
–3
–3
–45
–45
–45
–45
–18
–18
–18
–18
–3
–3
–3
–3
A
A
A
A
I
OS
Input Offset Current (Note 6) V
S
= 2.375V, V
ICM
= V
S
/4
V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
l
±0.2
±0.2
±0.2
±0.2
±2
±2
±3
±4
±0.2
±0.2
±0.2
±0.2
±2
±2
±3
±4
A
A
A
A
R
IN
Input Resistance Common Mode
Differential Mode
700
4.5
700
4.5
kΩ
kΩ
C
IN
Input Capacitance Differential 2 2 pF
e
n
Differential Input Referred Noise
Voltage Density
f = 50kHz 3 3 nV/√Hz
i
n
Input Noise Current Density f = 50kHz 2.5 2.5 pA/√Hz
e
nVOCM
Input Referred Common Mode Output
Noise Voltage Density
f = 50kHz, V
OCM
Shorted to Ground 15 15 nV/√Hz
V
ICMR
(Note 7)
Input Signal Common Mode Range V
S
= 3V
V
S
= ±5V
l
l
0
–5
1.75
3.75
0
–5
1.75
3.75
V
V
CMRRI
(Note 8)
Input Common Mode Rejection Ratio
(Input Referred) ΔV
ICM
/ΔV
OSDIFF
V
S
= 3V, ΔV
ICM
= 0.75V
l
55 85 55 85 dB
CMRRIO
(Note 8)
Output Common Mode Rejection Ratio
(Input Referred) ΔV
OCM
/ΔV
OSDIFF
V
S
= 5V, ΔV
OCM
= 2V
l
65 85 65 85 dB
PSRR
(Note 9)
Differential Power Supply Rejection
(ΔV
S
/ΔV
OSDIFF
)
V
S
= 3V to ±5V
l
69 105 69 105 dB
PSRRCM
(Note 9)
Output Common Mode Power Supply
Rejection (ΔV
S
/ΔV
OSCM
)
V
S
= 3V to ±5V
l
45 70 45 70 dB
G
CM
Common Mode Gain (∆V
OUTCM
/ΔV
OCM
)
V
S
= ±2.5V
l
1V/V
Common Mode Gain Error
100 • (G
CM
– 1)
V
S
= ±2.5V
l
–0.15 ±1 %
BAL
Output Balance (ΔV
OUTCM
/ΔV
OUTDIFF
) ΔV
OUTDIFF
= 2V
Single-Ended Input
Differential Input
l
l
–65
–71
–46
–50
–65
–71
–46
–50
dB
dB
V
OSCM
Common Mode Offset Voltage
(V
OUTCM
– V
OCM
)
V
S
= 2.375V, V
ICM
= V
S
/4
V
S
= 3V
V
S
= 5V
V
S
= ±5V
l
l
l
l
±2.5
±2.5
±2.5
±2.5
±25
±25
±30
±40
±2.5
±2.5
±2.5
±2.5
±25
±25
±30
±40
mV
mV
mV
mV
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, V
CM
= V
OCM
= V
ICM
= mid-supply, V
SHDN
= OPEN,
R
I
= R
F
= 499Ω, R
L
= 800Ω to a mid-supply voltage (See Figure 1) unless otherwise noted. V
S
is defi ned (V
+
– V
–
). V
OUTCM
is defi ned
as (V
OUT
+
+ V
OUT
–
)/2. V
ICM
is defi ned as (V
IN
+
+ V
IN
–
)/2. V
OUTDIFF
is defi ned as (V
OUT
+
– V
OUT
–
). V
INDIFF
is defi ned as (V
IN
+
– V
IN
–
).
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LT1994IDD#TRPBF

Mfr. #:
Buy LT1994IDD#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 70MHz Low Noise/Distortion Differential Amplifer
Lifecycle:
New from this manufacturer.
Delivery:
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