LM146
LM246 - LM346
PROGRAMMABLE
QUAD BIPOLAR OPERATIONAL AMPLIFIERS
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.
.
.
.
.
.
.
.
PROGRAMMABLE ELECTRICAL CHARAC-
TERISTICS
BATTERY POWERED OPERATION
LOW SUPPLY CURRENT (250µA/amplifier)
GAIN-BANDWIDTH PRODUCT : 1MHz
LARGE DC VOLTAGE GAIN : 120dB
LOW NOISE VOLTAGE : 28nV/VHz
WIDE POWER SUPPLY RANGE :
±1.5V
to
±22V
CLASSE AB OUTPUT STAGE. NO CROSS-
OVER DISTORTION
OVERLOAD PROTECTION FOR INPUTS AND
OUTPUTS
N
DIP16
(Plastic Package)
D
SO16
(Plastic Micropackage)
ORDER CODES
Part
Number
LM146
LM246
Temperature
Range
–55
o
C, +125
o
C
–40 C, +105 C
0
o
C, +70
o
C
o
o
Package
N
•
•
•
D
•
•
•
DESCRIPTION
The LM346 consists of four independent, high gain,
internally compensated, low power programmable
amplifiers. Two external resistors (R
set
) allow the
user to program the gain-bandwith product, slew
rate, supply current, input bias current, input offset
current and input noise. For example the user can
trade-off supply current for bandwidth or optimize
noise figure for a given source resistance. In a simi-
lar way other amplifier characteristics can be
tailored to the application.
Except for the two programming pins at the end of
the package the LM346 pin out is the same as the
LM324 and LM348.
PROGRAMMING EQUATIONS :
Total supply current = 1mA (I
set
= 10µA)
Gain-bandwidthproduct = 1MHz (I
set
= 10µA)
Slew rate = 0.5V/µs (I
set
= 10µA)
Input bias current
≈30
nA (I
set
= 10µA)
I
set
= current into pin 8 and pin 9
(see schematic diagram)
V
CC
+
−
V
CC
−
−
0.6V
I
set
=
R
set
November 1997
LM346
Example :
LM246N
PIN CONNECTIONS
(top view)
Output1
Inverting input 1
Non-invertinginput 1
V +
CC
Non-invertinginput 2
Inverting input 2
Output2
Set
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Output4
Inverting input 4
Non-invertinginput 4
VCC
Non-invertinginput 3
Inverting input 3
Output 3
Set
1/9
LM146 - LM246 - LM346
SCHEMATIC DIAGRAM
(1/4 LM146)
Q15
Q16
V
CC
Q10
Inverting
input
Non-
inverting
input
R1
30Ω
Q12
Q14
Q11
Q13
V
CC
V
CC
Q9
R
set
I
set
SET
Q20
Q8
Q3
Q4
Q21
Q7
R2
1kΩ
Q18
Q19
R
set
To other op amps
I
set
SET
Output
Q1
Q2
C
C
8pF
V
CC
V
CC
Q6
Q5
Q17
V
CC
or
V
CC
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
i
V
id
Supply Voltage
Input Voltage - (note 1)
Differential Input Voltage
Output Short-circuit Duration - (note 2)
P
tot
T
oper
T
stg
Power Dissipation
N/D Suffix
Operating Free-air Temperature Range
Storage Temperature Range
–55 to +125
–65 to +150
Parameter
LM146
±22
±15
±30
LM246
±22
±15
±30
Infinite
mW
500
–40 to +105
–65 to +150
0 to +70
–65 to +150
o
o
LM346
±22
±15
±30
Unit
V
V
V
C
C
Notes :
1. For suppl y voltages l ess than
±15V,
the absolute maximum input vol tage is equal to the supply vol tage.
2. Any of t he amplifi er out puts can be shorted to ground indef initl y ; however more than one should not be
simultaneously shorted as the maximum junction temperature wil l be exceeded.
2/9
LM146 - LM246 - LM346
ELECTRICAL CHARACTERISTICS
V
CC
=
±15V,
I
set
= 10µA, T
amb
= +25
o
C (unless otherwise specified)
Symbol
V
io
Parameter
Input Offset Voltage (R
S
≤
10kΩ)
o
T
amb
= 25 C
T
min
.
≤
T
amb
≤
T
max.
Input Offset Current
T
amb
= 25
o
C
T
min
.
≤
T
amb
≤
T
max.
Input Bias Current
T
amb
= 25
o
C
T
min
.
≤
T
amb
≤
T
max.
Large Signal Voltage Gain
(V
o
=
±10V,
R
L
= 10kΩ)
T
amb
= 25
o
C
T
min
.
≤
T
amb
≤
T
max.
Supply Voltage Rejection Ratio (R
S
≤
10kΩ)
o
T
amb
= 25 C
T
min
.
≤
T
amb
≤
T
max.
Supply Current, all Amp, no Load
o
T
amb
= 25 C
T
min
.
≤
T
amb
≤
T
max.
Input Common Mode Voltage Range
T
amb
= 25
o
C
T
min
.
≤
T
amb
≤
T
max.
Common Mode Rejection Ratio (R
S
≤
10kΩ)
o
T
amb
= 25 C
T
min
.
≤
T
amb
≤
T
max.
Output Short-circuit Current
o
T
amb
= 25 C
T
min
.
≤
T
amb
≤
T
max.
Output Voltage Swing (R
L
= 10kΩ)
o
T
amb
= 25 C
T
min
.
≤
T
amb
≤
T
max.
Slew Rate (V
I
=
±10V,
R
L
= 10kΩ, C
L
= 100pF,
unity Gain)
Input Resistance
Input Capacitance
Channel Separation (R
L
= 10kΩ, V
o
= 12V
pp
)
Gain Bandwidth Product
(V
I
= 10 mV, R
L
= 10kΩ, C
L
= 100pF
f = 100kHz)
Total Harmonic Distortion
(f = 1kHz, A
v
= 20dB, R
L
= 10kΩ
C
L
= 100pF, v
o
= 2V
pp
)
Equivalent Input Noise Voltage
(f = 1kHz, R
s
= 100Ω)
±13.5
±13.5
80
70
10
4
12
12
0.3
110
LM146
Min.
Typ.
0.5
Max.
3
5
20
25
100
100
LM246 - LM346
Min.
Typ.
0.5
Max.
5
6
nA
2
2
100
100
nA
30
30
250
250
V/mV
100
50
80
80
1000
50
25
80
80
2
2
±13.5
±13.5
80
70
30
35
10
4
12
12
0.3
110
mA
20
20
30
35
V
14
14
V/µs
0.5
1
2
120
0.5
1
2
120
MΩ
pF
dB
MHz
0.8
1
0.5
1
%
0.015
28
0.015
28
nV
Hz
√
1000
dB
110
110
mA
1
1
2
2
V
Unit
mV
I
io
I
ib
A
vd
SVR
I
CC
V
icm
CMR
dB
I
OS
±
V
opp
SR
R
I
C
I
V
o1
/V
o2
GBP
THD
e
n
3/9
FPGA/CPLD
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