Datasheet

3
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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
–
).