GENERAL
The
DESCRIPTION
DEVICES
AD108,
AD208
and
AD308
are precision
operational
ANALOG
amplifiers fabricated on a single silicon chip. The use of super beta transistors in
the input stage, along with improved process control, results in guaranteed input
currents nearly a thousand times lower than industry standards such as the AD741.
Guaranteed offset voltage drift and current drift specifications permit the circuits to be
used in applications requiring excellent temperature stability. Operation with supply
voltages as low as i:.2V, and extremely low power consumption make the devices ideal
for battery powered applications. Frequency Compensation is accomplished using a
single external capacitor.
The AD 108 and AD208
have identical
specifications,
with the AD108 guaranteed over
the -55°C to +125°C temperature range and the .-:..D208 guaranteed over the -25°C to
+85°C temperature range. The AD308 is specified 'over the DoC to
+70°C
temperature
r,ange.
OBS
SCHEMATIC
DIAGRAM
COMPENSATION
INPUTS
All devices are pin compatible with the popular AD101A,
are available in the TO-99 package configuration.
AD201A,
AD301A
series and
CoMPENSATION
OLE
TE
V+
RIO
OUTPUT
Rl1
,019
R12
v-
PHYSICAL DIMENSIONS
(In Inches)
(TO-99)
CONNECTION DIAGRAM
OUTPUT
v-
Note: Pin 4 connected to case.
(
,
TOP VI EVIl
.~ .~,--
__,H
"'--
Supply Voltage
AD108, AD208
AD308
Power Dissipation (Note 1)
Differential Input Current (Note 2)
Input Voltage (Note 3)
Output -Short-Circuit Duration
Operating Temperature Range
AD108
AD208
AD308
Storage Temperature Range
Lead Temperature (Soldering, 60 sec)
:1:20V
:1: 8V
1
500 mW
:1:10mA
:1:15V
Indefinite
-55°C to +125°C
-25°C to +85°C
OoC to +70°C
-65°C to +150°C
300°C
OBS
Parameters
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Resistance
Supply Current
Large Signal Voltage Gain
V c:.= :1:15V
Conditions
MIN
AD108
AD208
TYP
0.7
0.05
0.8
70
0.3
300
MAX
2.0
0.2
2.0
MIN
AD308
TYP
2.0
0.2
1.5
40
0.3
300
MAX
7.5
1
7
UNITS
mV
nA
nA -
Mil
mA
V/mV
Input Offset Voltage
Average Temp. Coefficient
of Input Offset Voltage
I
I
OLE
TE
30
10
0.6
50
25
I
3.0
I
I
10
I
I
mV
3.0
Input Offset Current
Average Temp. Coefficient
of Input Offset Current
I
15
0.4
6.0
30
1.5
10
10
/1V/C
nA
pA/C
nA
0.5
I
Input Bias Current
Supply Current
TA = +125°C
{
2.5
3.0
2.0
I
I
Vs = :1:20V
VS=:1:15V
VOUT = :1:10V
RL 10Kil
Vs = :t15V
RL = 10Kil
Vs = :1:15V
I
0.15
25
:1:13
:1:14
85
80
:1:14
100
96
0.4
I
I
15
:1:13
:1:14
80
80
:1:14
100
96
mA
V/mV
V
V
dB
dB
LargeSignalVoltage Gain
Output Voltage Swing
I
I
I
I
j
Input Voltage Range
Common Mode Rejection Ratio
Supply Voltage Rejection Ratio
Note 1:
The
maximum
junction
temperature
of the AD108
must
is 150oe,
of the AD208
is 100oe,
resistance
and of the AD308
of 150oe/W
junction
is 85°e.
For operation
or 45°e/W
at elevated temperatures,
junction to case.
Note 2:
the TO-99 package
be derated
based on a thermal
to ambient
The inputs are shunted with back-to-back
voltage in excess of 1V is applied between
diodes for overvoltage protection. Therefore, excessive current
the inputs unless some limiting resistance is used.
will flow if a differential
input
Note 3:
Note 4:
For supply voltages less than 115V, the absolute maximum input voltage is equal to the supply voltage.
Unless otherwise noted, these specifications apply for supply voltages and ambient temperatures of :1:5Vto :!:20V and -55°e
+125°e for the AD108, :1:5Vto :1:20Vand -25°e to +85°e for the AD208, and :1:5Vto :!:15Vand ooe to +70oe for the AD308.
to
Input Cunent5
Max;mum
k
0,;11 Enol
> 100'
E
I
-
Max;mum Offset EnOl
I
,0'
7'
108/206
t:
>
0100
I
~
;:
0
>
"
~
w
1
,
I
,
I
~
ii'
0
10
-308
108/208
OBS
OLE
TE
0.10
0
-55
-35 -15
105
125
10-
lOOk
AD108 -55"e"'A
AD208-25"e'Ac,
AD3?8 O"eCTA':
"25"e
85"e
,70"e
(;
5
~
;:,.
~
;i
>
5
)
:;:
100M
0
1
lOOk
AD'08-55"eTA"25"e
AD208-25"e"'A'"
85"e
AD3?8 O"C"TA ":,1°'e
1000
Input No;se Voltage
400
I
~
I
0
Z
~
'"
~
~
AS" 1M
I 110
Z
~
100
I
«
OJ
Jsl.I,I00k
AS
"
~
40
-
0
III
10
/I
;0
100
nO
w
lOOk
15
Output Sw;ng
"
TA"2-..
TA" '70"e
120
;;
10
I
OJ
Z
,
,
,
.......
20
.,.......
Us "5V
100
80
sg
60
OJ
;:
180
~
5
~
" 5
T')
"'25"e-
0
TA" O"e
I I
I
0
0
Tr"Te
-
-
-
I
-
-
f-
«
40
g
IIIII!II
20
0
-20
1
10
1M
10M
16
10
TA " '25"e
1
;;
I
OJ
Z
~
12
Us '15u
...
e," 3pF
~ 4
OJ
Z 2
;;
: 0
OJ
~
~ -2
0
> -4
-6
-8I
-10
~
"
~
"
0
,
- .,...
-
INPUT
"
1\
'
J
J
"
OUTPUT
,
'-
,
TA-'25"e
US" "5u
efl "3IPF
140 ]60
""""
"""100..
-Y"ITr--'
Standard Compensation Circuit
R1
-VIN
R2
-V'N
Alternate* Frequency Compensation
R1
R2
6
VOUT
6
VOUT
OBS
Cf
+VIN
R1 Co
Cf ?R1 + R2
+VIN
Co = 30pF
I
-=
-
8
Cs
100pF
*Improves
rejection
of
power
supply noise by
a factor of ten
For other selected Analog Devices Linear. Integrated Circ~its,refer>to the specification sheets listed below.
Operational Amplifiers
AD101A, 201A, 301A
AD108, 208, 308
AD108A, 208A, 308A
AD741, 741C, 741K
AD502J, 502K, 502L
AD503J,503K
AD503L
AD504J" 504K
AD505J,505K
AD513J,513K
Special Function Circuits
AD520J,520K
AD530J,530K
-
-
-
-
General Purpose, Externally Compensated
High Performance, General Purpose
High Performance, General Purpose
General Purpose, Internally Compensated
General Purpose, Internally Compensated
- FET
Input, Internally Compensated
- FET
Input, Internally Compensated, Internally Trimmed
High Precision, Low Drift
High Speed
-
FET
Input, High Speed
OLE
TE
>
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>
>
-
-
-
Instrumentation Amplifier
Complete Multiplier, Divider, Squarer, Square Rooter
-~
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