AD8608 Analog Devices, AD8608 Datasheet - Page 16

• Manufacturer Part Number: AD8608
• Description: Precision, Low Noise, CMOS, Rail-to-Rail, Input/Output Operational Amplifier (Quad)
• Manufacturer: Analog Devices

Specifications of AD8608

• Vcc-vee: 2.7V to 6V
• Isy Per Amplifier: 1.2mA
• Packages: SOIC,SOP
• -3db Bandwidth: 10MHz
• Slew Rate: 5V/µs
• Vos: 20µV
• Ib: 200fA
• # Opamps Per Pkg: 4
• Input Noise (nv/rthz): 6.5nV/rtHz

AD8605/AD8606/AD8608
APPLICATIONS INFORMATION
OUTPUT PHASE REVERSAL
Phase reversal is defined as a change in polarity at the output of
the amplifier when a voltage that exceeds the maximum input
common-mode voltage drives the input.
Phase reversal can cause permanent damage to the amplifier; it
can also cause system lockups in feedback loops. The
does not exhibit phase reversal even for inputs exceeding the
supply voltage by more than 2 V.
MAXIMUM POWER DISSIPATION
Power dissipated in an IC causes the die temperature to
increase, which can affect the behavior of the IC and the
application circuit performance.
The absolute maximum junction temperature of the AD8605/
AD8606/AD8608
damage or destroy the device.
The maximum power dissipation of the amplifier is calculated
according to
where:
T
T
θ
Figure 45 compares the maximum power dissipation with
temperature for the various AD860x family packages.
INPUT OVERVOLTAGE PROTECTION
The
voltage applied at either input exceeds the supplies by more
than 0.5 V, external resistors should be placed in series with
the inputs. The resistor values can be determined by
The remarkable low input offset current of the
allows the use of larger value resistors. With a 10 kΩ resistor at
the input, the output voltage has less than 10 nV of error voltage.
A 10 kΩ resistor has less than 13 nV/√Hz of thermal noise at
room temperature.
THD + NOISE
Total harmonic distortion is the ratio of the input signal in V rms
to the total harmonics in V rms throughout the spectrum.
Harmonic distortion adds errors to precision measurements
and adds unpleasant sonic artifacts to audio systems.
The
that the
over the entire audio frequency range. The
in positive unity gain, which is the worst case, and with a load
of 10 kΩ.
JA
J
A
is the junction temperature.
is the ambient temperature.
is the junction-to-ambient thermal resistance.
AD8605
AD8605
P
V
DISS
IN
AD8605
R
−
S
=
V
S
T
has a low total harmonic distortion. Figure 46 shows
has internal protective circuitry. However, if the
J
≤
θ
−
JA
5
has less than 0.005% or −86 dB of THD + N
T
is 150°C. Exceeding this temperature could
mA
A
AD8605
AD8605
is configured
AD8605
(<1 pA)
Rev. L | Page 16 of 24
Figure 45. Maximum Power Dissipation vs. Ambient Temperature
0.0001
0.001
0.01
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.1
0
–45
V
V
A
R
20
MSOP-8
S
IN
V
L
= ±2.5V
= 10kΩ
V
A
B
= 1
SOIC-8
= 6V p-p
SY
V
W
TSSOP-14
= 1
= 80kHz
–20
= ±2.5V
Figure 46. THD + Noise vs. Frequency
WLCSP-5
V
Figure 44. No Phase Reversal
IN
AMBIENT TEMPERATURE (°C)
5
100
SOIC-14
V
5-LEAD SOT-23
OUT
TIME (4µs/DIV)
FREQUENCY (Hz)
30
55
1k
80
Data Sheet
105
10k
130
20k