Datasheet

AD8505/AD8506/AD8508
Rev. E | Page 4 of 20
ELECTRICAL CHARACTERISTICS—5 V OPERATION
V
SY
= 5 V, V
CM
= V
SY
/2, T
A
= 25°C, R
L
= 100 k to GND, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
0 V ≤ V
CM
≤ 5 V 0.5 2.5 mV
−40°C ≤ T
A
≤ +125°C 3.5 mV
Input Bias Current I
B
1 10 pA
−40°C ≤ T
A
≤ +85°C 100 pA
−40°C ≤ T
A
≤ +125°C 600 pA
Input Offset Current I
OS
0.5 5 pA
−40°C ≤ T
A
≤ +85°C 50 pA
−40°C ≤ T
A
≤ +125°C 130 pA
Input Voltage Range −40°C ≤ T
A
≤ +125°C 0 5 V
Common-Mode Rejection Ratio CMRR 0 V ≤ V
CM
≤ 5 V 90 105 dB
−40°C ≤ T
A
≤ +85°C 90 dB
−40°C ≤ T
A
≤ +125°C 85 dB
Large-Signal Voltage Gain A
VO
0.05 V ≤ V
OUT
≤ 4.95 V,
R
L
= 100 kΩ to V
CM
105 120 dB
−40°C ≤ T
A
≤ +125°C 100 dB
Offset Voltage Drift
ΔV
OS
/ΔT
−40°C ≤ T
A
≤ +125°C 2 μV/°C
Input Resistance R
IN
220 GΩ
Input Capacitance, Differential Mode C
INDM
3 pF
Input Capacitance, Common Mode C
INCM
4.2 pF
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
R
L
= 100 kΩ to GND 4.98 4.99 V
−40°C ≤ T
A
≤ +125°C 4.98 V
R
L
= 10 kΩ to GND 4.9 4.95 V
−40°C ≤ T
A
≤ +125°C 4.9 V
Output Voltage Low V
OL
R
L
= 100 kΩ to V
SY
2 5 mV
−40°C ≤ T
A
≤ +125°C 5 mV
R
L
= 10 kΩ to V
SY
10 25 mV
−40°C ≤ T
A
≤ +125°C 30 mV
Short-Circuit Limit I
SC
V
OUT
= V
SY
or GND ±45 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR V
SY
= 1.8 V to 5 V 100 110 dB
−40°C ≤ T
A
≤ +85°C 100 dB
−40°C ≤ T
A
≤ +125°C 95 dB
Supply Current per Amplifier I
SY
AD8506/AD8508 V
OUT
= V
SY
/2 15 20 μA
−40°C ≤ T
A
≤ +125°C 25 μA
AD8505 −40°C ≤ T
A
≤ +125°C 25.5 μA
DYNAMIC PERFORMANCE
Slew Rate SR R
L
= 100 kΩ, C
L
= 10 pF, G = 1 13 mV/μs
Gain Bandwidth Product GBP R
L
= 1 MΩ, C
L
= 20 pF, G = 1 95 kHz
Phase Margin Φ
M
R
L
= 1 MΩ, C
L
= 20 pF, G = 1 60 Degrees
NOISE PERFORMANCE
Voltage Noise e
n
p-p f = 0.1 Hz to 10 Hz 2.8 μV p-p
Voltage Noise Density e
n
f = 1 kHz 45 nV/√Hz
Current Noise Density i
n
f = 1 kHz 15 fA/√Hz