Datasheet
ELECTRICAL CHARACTERISTICS: V
S
= +1.8V to +5.5V
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
www.ti.com
Boldface limits apply over the specified temperature range indicated.
At T
A
= +25 ° C, R
L
= 25k Ω connected to V
S
/2, and V
CM
< (V+) – 1V, unless otherwise noted.
OPA379, OPA2379, OPA4379
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OFFSET VOLTAGE
Initial Offset Voltage V
OS
V
S
= 5V 0.4 1.5 mV
Over – 40 ° C to +125 ° C 2 mV
Drift, – 40 ° C to +85 ° C dV
OS
/dT 1.5 µ V/ ° C
Drift, – 40 ° C to +125 ° C 2.7 µ V/ ° C
vs Power Supply PSRR 2 10 µ V/V
Over – 40 ° C to +125 ° C 20 µ V/V
INPUT VOLTAGE RANGE
Common-Mode Voltage Range V
CM
(V – ) – 0.1 to (V+) + 0.1 V
Common-Mode Rejection Ratio
(1)
CMRR (V – ) < V
CM
< (V+) – 1V 90 100 dB
Over – 40 ° C to +85 ° C (V – ) < V
CM
< (V+) – 1V 80 dB
Over – 40 ° C to +125 ° C (V – ) < V
CM
< (V+) – 1V 62 dB
INPUT BIAS CURRENT
Input Bias Current I
B
V
S
= 5V, V
CM
≤ V
S
/2 ± 5 ± 50 pA
Input Offset Current I
OS
V
S
= 5V ± 5 ± 50 pA
INPUT IMPEDANCE
Differential Ω || pF
10
13
|| 3
Common-Mode Ω || pF
10
13
|| 6
NOISE
Input Voltage Noise f = 0.1Hz to 10Hz 2.8 µ V
PP
Input Voltage Noise Density e
n
f = 1kHz 80 nV/ √ Hz
Input Current Noise Density i
n
f = 1kHz 1 fA/ √ Hz
OPEN-LOOP GAIN
Open-Loop Voltage Gain A
OL
V
S
= 5V, R
L
= 25k Ω , 100mV < V
O
< (V+) – 100mV 100 120 dB
Over – 40 ° C to +125 ° C V
S
= 5V, R
L
= 25k Ω , 100mV < V
O
< (V+) – 100mV 80 dB
V
S
= 5V, R
L
= 5k Ω , 500mV < V
O
< (V+) – 500mV 100 120 dB
Over – 40 ° C to +125 ° C V
S
= 5V, R
L
= 5k Ω , 500mV < V
O
< (V+) – 500mV 80 dB
OUTPUT
Voltage Output Swing from Rail R
L
= 25k Ω 5 10 mV
Over – 40 ° C to +125 ° C R
L
= 25k Ω 15 mV
R
L
= 5k Ω 25 50 mV
Over – 40 ° C to +125 ° C R
L
= 5k Ω 75 mV
Short-Circuit Current I
SC
± 5 mA
Capacitive Load Drive C
LOAD
See Typical Characteristics
Closed-Loop Output Impedance R
OUT
G = 1, f = 1kHz, I
O
= 0 10 Ω
Open-Loop Output Impedance R
O
f = 100kHz, I
O
= 0 28 k Ω
FREQUENCY RESPONSE C
LOAD
= 30pF
Gain Bandwidth Product GBW 90 kHz
Slew Rate SR G = +1 0.03 V/ µ s
Overload Recovery Time V
IN
× GAIN > V
S
25 µ s
Turn-On Time t
ON
1 ms
(1) See Typical Characteristic gragh, Common-Mode Rejection Ratio vs Frequency (Figure 3 ).
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