November 1997
PROGRAMMABLE
QUAD BIPOLAR OPERATIONAL AMPLIFIERS
.
PROGRAMMABLE ELECTRICAL CHARAC-
TERISTICS
.
BATTERY POWERED OPERATION
.
LOW SUPPLY CURRENT (250
A/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
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
= 10
A)
Gain-bandwidth product = 1MHz (I
set
= 10
A)
Slew rate = 0.5V/
s (I
set
= 10
A)
Input bias current
30 nA (I
set
= 10
A)
I
set
= current into pin 8 and pin 9
(see schematic diagram)
I
set
=
V
CC
+
-
V
CC
-
-
0.6V
R
set
4
5
6
7
9
10
11
12
13
15
1
2
3
8
16
14
Output 1
Inverting input 1
Non-invertinginput 1
Non-invertinginput 2
Inverting input 2
Output 2
Set
Output 4
Inverting input 4
Non-invertinginput 4
VCC
Non-invertinginput 3
Inverting input 3
Output 3
Set
V
CC
+
PIN CONNECTIONS (top view)
ORDER CODES
Part
Number
Temperature
Range
Package
N
D
LM146
55
o
C, +125
o
C
LM246
40
o
C, +105
o
C
LM346
0
o
C, +70
o
C
Example : LM246N
N
DIP16
(Plastic Package)
D
SO16
(Plastic Micropackage)
LM146
LM246 - LM346
1/9
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.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
LM146
LM246
LM346
Unit
V
CC
Supply Voltage
22
22
22
V
V
i
Input Voltage - (note 1)
15
15
15
V
V
id
Differential Input Voltage
30
30
30
V
Output Short-circuit Duration - (note 2)
Infinite
P
tot
Power Dissipation
N/D Suffix
500
mW
T
oper
Operating Free-air Temperature Range
55 to +125
40 to +105
0 to +70
o
C
T
stg
Storage Temperature Range
65 to +150
65 to +150
65 to +150
o
C
V
CC
V
CC
V
CC
or
Q18
Q19
To other op amps
V
CC
V
CC
Output
R
set
R
set
I
set
I
set
SET
SET
R1
30
Q12
Q10
Q11
Q9
Q16
Q15
Q14
Q13
8pF
C
C
Non-
inverting
input
Q20
Q6
Q8
Q5
R2
1k
Q7
Q21
Q4
Q3
Q17
V
CC
V
CC
Q1
Q2
Inverting
input
SCHEMATIC DIAGRAM (1/4 LM146)
LM146 - LM246 - LM346
2/9
ELECTRICAL CHARACTERISTICS
V
CC
=
15V, I
set
= 10
A, T
amb
= +25
o
C (unless otherwise specified)
Symbol
Parameter
LM146
LM246 - LM346
Unit
Min.
Typ.
Max.
Min.
Typ.
Max.
V
io
Input Offset Voltage (R
S
10k
)
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
0.5
3
5
0.5
5
6
mV
I
io
Input Offset Current
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
2
20
25
2
100
100
nA
I
ib
Input Bias Current
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
30
100
100
30
250
250
nA
A
vd
Large Signal Voltage Gain
(V
o
=
10V, R
L
= 10k
)
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
100
50
1000
50
25
1000
V/mV
SVR
Supply Voltage Rejection Ratio (R
S
10k
)
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
80
80
110
80
80
110
dB
I
CC
Supply Current, all Amp, no Load
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
1
2
2
1
2
2
mA
V
icm
Input Common Mode Voltage Range
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
13.5
13.5
13.5
13.5
V
CMR
Common Mode Rejection Ratio (R
S
10k
)
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
80
70
110
80
70
110
dB
I
OS
Output Short-circuit Current
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
10
4
20
30
35
10
4
20
30
35
mA
V
opp
Output Voltage Swing (R
L
= 10k
)
T
amb
= 25
o
C
T
min
.
T
amb
T
max.
12
12
14
12
12
14
V
SR
Slew Rate (V
I
=
10V, R
L
= 10k
, C
L
= 100pF,
unity Gain)
0.3
0.5
0.3
0.5
V/
s
R
I
Input Resistance
1
1
M
C
I
Input Capacitance
2
2
pF
V
o1
/V
o2
Channel Separation (R
L
= 10k
, V
o
= 12V
pp
)
120
120
dB
GBP
Gain Bandwidth Product
(V
I
= 10 mV, R
L
= 10k
, C
L
= 100pF
f = 100kHz)
0.8
1
0.5
1
MHz
THD
Total Harmonic Distortion
(f = 1kHz, A
v
= 20dB, R
L
= 10k
C
L
= 100pF, v
o
= 2V
pp
)
0.015
0.015
%
e
n
Equivalent Input Noise Voltage
(f = 1kHz, R
s
= 100
)
28
28
nV
Hz
LM146 - LM246 - LM346
3/9
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