TS321
Low power single operational amplifier
Features
■
■
■
■
■
Large output voltage swing:
0 to 3.5V min. (V
CC
= 5V)
Low supply current: 500µA
Low input bias current: 20nA
Low input offset voltage: 2mV max.
Wide power supply range:
– Single supply: +3V to +30V
– Dual supplies: ±1.5V to ±15V
Stable with high capacitive loads
SO-8
(Plastic micropackage)
■
SOT23-5
(Plastic package)
Description
The TS321 is intended for cost-sensitive
applications where space saving is of great
importance. This bipolar op-amp offers the
benefits of a reduced component size (SOT23-5
package), with specifications that match (or are
better than) industry standard devices (like the
popular LM358A, LM324, etc.). The TS321 has
an input common mode range (V
icm
) that includes
ground, and therefore can be employed in single
supply applications.
Pin connections (top view)
N.C.
Inverting input
Non-inverting input
V
-
CC
1
2
3
4
-
+
8
7
6
5
N.C.
+
VCC
Output
N.C.
Output
V
-
CC
Non-inverting input
1
5
+
V
CC
2
3
4
Inverting input
November 2007
Rev 5
1/12
www.st.com
12
TS321
Absolute maximum ratings and operating conditions
2
Table 1.
Symbol
V
CC+
V
i
V
id
Absolute maximum ratings and operating conditions
Absolute maximum ratings
Parameter
Supply voltage
Input voltage
Differential input voltage
Output short-circuit duration
(1)
I
in
T
stg
T
j
R
thja
Input current
(2)
Storage temperature range
Maximum junction temperature
Thermal resistance junction to ambient
(3)
SOT23-5
SO-8
Thermal resistance junction to case
(3)
SOT23-5
SO-8
HBM: human body model
(4)
ESD
MM: machine model
(5)
CDM: charged device model
(6)
Value
±16 to 32
-0.3 to +32
+32
Infinite
50
-65 to +150
+150
250
125
81
40
300
200
1500
V
mA
°C
°C
°C/W
Unit
V
V
V
R
thjc
°C/W
1. Short-circuits from the output to V
CC
can cause excessive heating if V
CC
> 15V. The maximum output current is
approximately 40mA independent of the magnitude of V
CC
.
2. This input current only exists when the voltage at any of the input leads is driven negative. It is due to the collector-base
junction of the input PNP transistor becoming forward biased and thereby acting as input diodes clamps. In addition to this
diode action, there is also NPN parasitic action on the IC chip. This transistor action can cause the output voltages of the
Op-amps to go to the V
CC
voltage level (or to ground for a large overdrive) for the time during which an input is driven
negative. This is not destructive and normal output is restored when the input voltage goes back above -0.3V.
3. Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous short-circuits on all
amplifiers. All values are typical.
4. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a 1.5kΩ resistor
between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
5. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between two pins of the
device with no external series resistor (internal resistor < 5Ω). This is done for all couples of connected pin combinations
while the other pins are floating.
6. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly
to the ground through only one pin. This is done for all pins. The CDM value applies to SO-8 only.
Table 2.
Symbol
V
CC+
V
icm
T
oper
Operating conditions
Parameter
Supply voltage
Common mode input voltage range (V
CC+
= 30V)
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Operating free-air temperature range
Value
3 to 30
0 to V
CC+
-1.5
0 to V
CC+
-2
-40 to +125
Unit
V
V
°C
3/12
TS321
Table 3.
Symbol
φm
THD
en
Electrical characteristics
V
CC+
= +5V, V
CC-
= Ground, V
o
= 1.4V, T
amb
= +25°C (unless otherwise specified)
Parameter
Phase margin
Total harmonic distortion
Equivalent input noise
voltage
f = 1kHz, A
V
= 20dB, R
L
= 2kΩ V
o
= 2V
pp
,
,
+
C
L
= 100pF, V
CC
= +30V
,
f = 1kHz, R
s
= 100Ω V
CC+
= +30V
Conditions
Min.
Typ.
60
0.015
40
Max.
Unit
Degrees
%
nV
-----------
-
Hz
1. V
o
= 1.4V, R
s
= 0Ω, 5V < V
CC+
< 30V, 0 < V
icm
< V
CC+
- 1.5V.
2. The direction of the input current is out of the IC. This current is essentially constant and independent of the state of the
output, therefore there is no change in the load on the input lines.
5/12
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