Datasheet

AD8278/AD8279
Rev. C | Page 5 of 24
V
S
= +2.7 V to <±5 V, V
REF
= midsupply, T
A
= 25°C, R
L
= 10 k connected to midsupply, G = ½ difference amplifier configuration, unless
otherwise noted.
Table 4.
G = ½
Grade B Grade A
Parameter Conditions
Min Typ Max Min Typ Max
Unit
INPUT CHARACTERISTICS
System Offset
1
75 150 75 250 µV
Over Temperature T
A
= −40°C to +85°C 150 250 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
= 2.7 V, V
CM
= 0 V to
2.4 V, R
S
= 0 Ω 80 74 dB
V
S
= ±5 V, V
CM
= −10 V
to +7 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 870 870 kHz
Slew Rate 1.3 1.3 V/µs
Channel Separation f = 1 kHz 130 130 dB
Settling Time to 0.01% 2 V step on output,
C
L
= 100 pF, V
S
= 2.7 V
7 7 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
OUTPUT CHARACTERISTICS
Output Swing
4
R
L
= 10 kΩ,
T
A
= −40°C to +85°C −V
S
+ 0.1 +V
S
− 0.15 −V
S
+ 0.1 +V
S
− 0.15 V
Short-Circuit Current Limit ±10 ±10 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 T
A
= −40°C to +85°C 200 200 A
AD8279 Supply Current T
A
= −40°C to +85°C 375 375 A
Operating Voltage Range 2.0 36 2.0 36 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 section 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. 27 Figure 28