ST UA748 User Manual
UA748
PRECISION SINGLE OPERATIONAL AMPLIFIER
■ INPUT OFFSET VOLTAG E : 3mV max. OVER
TEMPERATURE
■ FREQUENCY COMPENSATION WITH A
SINGLE 30pF CAPA CITOR (C1)
■ OPERATION FROM ±5V to ±15V
■ LOW POWER CONSUMPTION :
50mW AT ±15V
■ CONTINUOUS SHORT-CIRCUIT PROTEC-
TION
■ OPERATION AS A COMP AR ATOR WIT H
DIFFERENTIAL INPUTS AS HIGH AS ±30V
■ NO LAT CH-UP WHEN COMMON-MODE
RANGE IS EXCEEDED
■ SAME PIN CONFIGURATION AS THE
LM101A
DESCRIPTION
The UA748 is a general purpose operational amplifier bu ilt on a single s ilicon chip. Th e resulting
close match and tight thermal coupling gives low
offsets and temperature drift as well as fast recovery from thermal transients.
■ Short-circuit protection
■ Offset voltage null capability
■ Large common-mode and differential voltage
ranges
■ Low power consumption
■ No latch-up
The unity-gain compensation spec ified make s the
circuit stable for all feedback configurations, even
with capacitive loads. However, it is possible to
optimize compensation for best high frequency
performance at any gain. The low pow er dissipation permits high voltage operation an d simplifies
packaging in full-temperature rang e systems.
PIN CONNECTIONS (top view)
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
ORDER CODE
Part Number Temperature Range
UA748C 0°C, +70°C
UA748I -40°C, +105°C
UA748M -55°C, +125°C
Example : UA748CN
N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
Package
ND
••
••
••
December 2001
1 - Offset null 1/frequency compensation
1
2
3
4
8
7
6
5
2 - Inverting input
3 - Non-inverting input
-
4 - V
CC
5 - Offset null 2
6 - Output
+
7 - V
CC
8 - Frequency compensation
1/7
UA748
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter UA748M UA748I UA748C Unit
V
P
T
T
1. Power dissipation must be cons idered to ensure maximum junction temperature (Tj) is not exceeded.
2/7
Supply voltage ±22 V
CC
V
Differential Input Voltage ±30 V
id
V
Input Voltage ±15 V
i
Power Dissipation
tot
1)
500 mW
Output Short-circuit Duration Infinite
Operating Free-air Temperature Range -55 to +125 -40 to +105 0 to +70 °C
oper
Storage Temperature Range -65 to +150 °C
stg
ELECTRICAL CHARACTERISTICS
V
= ±15V, T
CC
Symbol Parameter
Input Offset Voltage (Rs ≤ 10kΩ)
V
io
Input Offset Current
I
io
Input Bias Current
I
ib
Large Signal Voltage Gain (Vo = ±10V, RL = 2k
A
vd
Supply Voltage Rejection Ratio (R
SVR
Supply Current, no load
I
CC
Input Common Mode Voltage Range (V
V
icm
Common Mode Rejection Ratio (R
CMR
I
Output short Circuit Current 10 30 50 10 30 50 mA
OS
Output Voltage Swing (V
±V
opp
Slew Rate
SR
Rise Time
t
r
Overshoot
K
ov
Input Impedance (VCC = ±15V)
Z
i
Output Resistance (V
Ro
Gain Bandwith Product
GBP
Total Harmonic Distortion
THD
Input Offset Current Drift
DI
io
Input Offset Voltage Drift
DV
io
1. May be improved up to 10V/µs in inverting amplifier configuration.
= +25°C, C1 = 30pF (unless otherwise specified)
amb
T
= +25°C
amb
T
≤ T
amb
= +25°C
≤ T
amb
= +25°C
≤ T
amb
≤ T
≤ T
≤ T
max
max
max
T
T
T
T
min
amb
min
amb
min
Ω)
T
= +25°C
amb
T
≤ T
min
T
amb
T
min
T
amb
T
min
T
amb
T
min
T
amb
T
min
T
amb
R
T
min
R
= ±10V, RL = 2kΩ, CL = 100pF, unity Gain
V
i
= ±20mV, RL = 2kΩ, CL = 100pF, unity Gain
V
i
= 20mV, RL = 2kΩ, CL = 100pF, unity Gain
V
i
=10mV, RL = 2kΩ, CL = 100pF, f =100kHz
V
i
f =1kHz, A
25°C ≤ T
T
min
T
min
≤ T
amb
max
≤ 10kΩ)
s
= +25°C
≤ T
≤ T
amb
max
= +25°C
≤ T
≤ T
amb
max
CC
= +25°C
≤ T
≤ T
amb
max
≤ 10kΩ)
S
= +25°C
≤ T
≤ T
amb
max
CC
= ±15V)
= +25°C RL = 10k
= 2k
Ω,
L
= 2k
L
Vo =2V
≤ T
1)
≤ T
≤ T
amb
max
amb
amb
≤ T
=20dB, RL =2k
v
≤ T
≤ T
RL = 10k
max
= ±15V)
CC
max
max
= ±20V)
Ω
Ω
Ω
Ω
C
,
pp
= 100pF
L
UA748
UA748I/M UA748C
Min. Typ. Max. Min. Typ. Max.
0.7 2
27.510mV
3
1.5 10
25070nA
20
25 75
70 250
10
5025100 2515100 V/mV
808096 707096 dB
1.8 3
1.8 3
3
±15
±15
±15
±15
808096 707096 dB
12
10
12
10
14
13
12
14
10
13 V
12
10
0.25 0.5 0.25 0.5
0.3 0.3
55
1.5 4 1.5 4 M
75 75
0.5 1 0.5 1
0.015 0.015
1020100
1020300
200
315 630
Unit
nA
300
mA
3
V/µs
µ
MHz
pA/°C
600
µV/°C
V
s
%
Ω
Ω
%
3/7
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