Datasheet

AD8278/AD8279
Rev. C | Page 3 of 24
SPECIFICATIONS
V
S
= ±5 V to ±15 V, V
REF
= 0 V, T
A
= 25°C, R
L
= 10 k connected to ground, G = ½ difference amplifier configuration, unless
otherwise noted.
Table 2.
G = ½
Grade B Grade A
Parameter Conditions
Min Typ Max Min Typ Max
Unit
INPUT CHARACTERISTICS
System Offset
1
50 100 50 250 µV
Over Temperature T
A
= −40°C to +85°C 100 250 µV
vs. Power Supply V
S
= ±5 V to ±18 V 2.5 5 µV/V
Average Temperature
Coefficient T
A
= −40°C to +85°C 0.3 1 2 5 µV/°C
Common-Mode Rejection
Ratio (RTI)
V
S
= ±15 V, V
CM
= ±27 V,
R
S
= 0 Ω 80 74 dB
Input Voltage Range
2
−3 (V
S
+ 0.1) +3 (V
S
− 1.5) −3 (V
S
+ 0.1) +3 (V
S
− 1.5) V
Impedance
3
Differential 120 120 kΩ
Common Mode 30 30 kΩ
DYNAMIC PERFORMANCE
Bandwidth 1 1 MHz
Slew Rate 1.1 1.4 1.1 1.4 V/µs
Channel Separation f = 1 kHz 130 130 dB
Settling Time to 0.01% 10 V step on output,
C
L
= 100 pF 9 9 µs
Settling Time to 0.001% 10 10 µs
GAIN
Gain Error 0.005 0.02 0.01 0.05 %
Gain Drift T
A
= −40°C to +85°C 1 5 ppm/°C
Gain Nonlinearity V
OUT
= 20 V p-p 7 12 ppm
OUTPUT CHARACTERISTICS
Output Voltage Swing
4
V
S
= ±15 V, R
L
= 10 kΩ
T
A
= −40°C to +85°C −V
S
+ 0.2 +V
S
− 0.2 −V
S
+ 0.2 +V
S
− 0.2 V
Short-Circuit Current Limit ±15 ±15 mA
Capacitive Load Drive 200 200 pF
NOISE
5
Output Voltage Noise f = 0.1 Hz to 10 Hz 1.4 1.4 V p-p
f = 1 kHz 47 50 47 50 nV/√Hz
POWER SUPPLY
6
AD8278 Supply Current 200 200 A
Over Temperature T
A
= −40°C to +85°C 250 250 A
AD8279 Supply Current 300 350 300 350 A
Over Temperature T
A
= −40°C to +85°C 400 400 A
Operating Voltage Range
7
±2 ±18 ±2 ±18 V
TEMPERATURE RANGE
Operating Range −40 +125 −40 +125 °C
1
Includes input bias and offset current errors, RTO (referred to output).
2
The input voltage range may also be limited by absolute maximum input voltage or by the output swing. See the for details. Input Voltage Range
3
Internal resistors are trimmed to be ratio matched and have ±20% absolute accuracy.
4
Output voltage swing varies with supply voltage and temperature. See Figur through for details. e 22 Figure 25
5
Includes amplifier voltage and current noise, as well as noise from internal resistors.
6
Supply current varies with supply voltage and temperature. See Figure and for details. 26 Figure 28
7
Unbalanced dual supplies can be used, such as −V
S
= −0.5 V and +V
S
= +2 V. The positive supply rail must be at least 2 V above the negative supply and reference
voltage.