Datasheet

AD8646/AD8647/AD8648
Rev. D | Page 3 of 20
SPECIFICATIONS
V
SY
= 5 V, V
CM
= V
SY
/2, T
A
= +25
o
C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
V
CM
= 0 V to 5 V 0.6 2.5 mV
−40°C < T
A
< +125°C 3.2 mV
Offset Voltage Drift ∆V
OS
/∆T −40°C < T
A
< +125°C 1.8 7.5 V/°C
Input Bias Current I
B
0.3 1 pA
−40°C < T
A
< +85°C 50 pA
−40°C < T
A
< +125°C 550 pA
Input Offset Current I
OS
0.1 0.5 pA
−40°C < T
A
< +85°C 50 pA
−40°C < T
A
< +125°C 250 pA
Input Voltage Range V
CM
0 5 V
Common-Mode Rejection Ratio CMRR V
CM
= 0 V to 5 V 67 84 dB
Large Signal Voltage Gain A
VO
R
L
= 2 kΩ, V
O
= 0.5 V to 4.5 V 104 116 dB
Input Capacitance
Differential C
DIFF
2.5 pF
Common Mode C
CM
6.7 pF
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
I
OUT
= 1 mA 4.98 4.99 V
−40°C < T
A
< +125°C 4.90 V
I
OUT
= 10 mA 4.85 4.92 V
−40°C < T
A
< +125°C 4.70 V
Output Voltage Low V
OL
I
OUT
= 1 mA 8.4 20 mV
−40°C < T
A
< +125°C 40 mV
I
OUT
= 10 mA 78 145 mV
−40°C < T
A
< +125°C 200 mV
Output Current I
sc
Short circuit ±120 mA
Closed-Loop Output Impedance Z
OUT
At 1 MHz, A
V
= 1 5 Ω
POWER SUPPLY
Power Supply Rejection Ratio PSRR V
SY
= 2.7 V to 5.5 V 63 80 dB
Supply Current per Amplifier I
SY
1.5 2.0 mA
−40°C < T
A
< +125°C 2.5 mA
Supply Current Shutdown Mode
(AD8647 Only)
I
SD
Both amplifiers shut down,
V
IN_SDA
and V
IN_SDB
= 0 V
10 nA
−40°C < T
A
< +125°C 1 A
SHUTDOWN INPUTS (AD8647)
Logic High Voltage (Enabled) V
INH
−40°C < T
A
< +125°C +2.0 V
Logic Low Voltage (Power-Down) V
INL
−40°C < T
A
< +125°C +0.8 V
Logic Input Current (Per Pin) I
IN
−40°C < T
A
< +125°C 1 A
Output Pin Leakage Current −40°C < T
A
< +125°C (shutdown active) 1 nA
DYNAMIC PERFORMANCE
Slew Rate SR R
L
= 2 kΩ 11 V/s
Gain Bandwidth Product GBP 24 MHz
Phase Margin Ø
m
74 Degrees
Settling Time t
s
To 0.1% 0.5 s
Amplifier Turn-On Time (AD8647) t
on
25°C, A
V
= 1, R
L
= 1 kΩ (see Figure 44) 1 s
Amplifier Turn-Off Time (AD8647) t
off
25°C, A
V
= 1, R
L
= 1 kΩ (see Figure 45) 1 s