NJM2748/2748A
Low Offset, Low Drift single JFET Input
Operational Amplifier
■GENERAL
DESCRIPTION
The
NJM2748/2748A
is a Precision dual JFET input operational
amplifier which includes low input offset voltage: 0.7mV (typ) / 2.0mV
(max) and 6µV/°C typical offset drift.
The
NJM2748A
is guaranteed 20µV/°C maximum offset drift to
perform a 100% tested.
The
NJM2748/2748A
have the following features: low bias current of
50pA (typ), high slew rate of 13V/µs (typ).
These features are suitable for signal processing amplifiers of
instrumentation, measurement and industrial applications such as
sensor amplifier, current sensing and sample-and-hold circuit.
■PACKAGE
OUTLINE
NJM2748D/2748AD
NJM2748M/2748AM
■FEATURES
●Input
Offset Voltage Drift
●Input
Offset Voltage
●Input
Bias Current
●Slew
Rate
●Operating
Voltage
●Voltage
Gain
●Bipolar
Technology
•
Package Outline
NJM2748:
∆V
IO
/∆T= 6µV/°C typ.
NJM2748A:
∆V
IO
/∆T=20µV/°C max.
2.0mV max. @Ta=25°C ~ 85°C
3.0mV max. @Ta= -40°C
I
B
= 50pA typ. 200pA max. @Ta=25°C
SR=13V/µs typ. @Ta=25°C
Vopr= ±6.0V ~ ±16V
Av=100dB typ.
NJM2748D, NJM2748AD :DIP8
NJM2748M, NJM2748AM :DMP8
■PIN
CONFIGURATION
(Top View)
BALANCE
−INPUT
A
+INPUT A
V
−
1
2
3
4
8
7
6
5
NC
V
+
OUTPUT
BALANCE
NJM2748/2748A
Ver.2007-05-24
-1-
NJM2748/2748A
■ABSOLUTE
MAXIMUM RATING (Ta=25°C
unless otherwise specified)
PARAMETER
Supply Voltage
Common Mode Input Voltage
Differential Input Voltage
SYMBOL
V /V
+
-
RATING
UNIT
V
(Note1)
V
V
mW
(Note2)
(Note3)
mW
mW
±
18
±
15
±
30
500 [ DIP8 ], 300 [ DMP8 ]
430 [ DMP8 ]
580 [ DMP8 ]
V
ICM
V
ID
P
D
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
-40 ~ +85
-50 ~ +125
°C
°C
(Note1) For supply voltage less than ±18V, the maximum input voltage is equal to the supply voltage.
(Note2) Mounted on the EIA/JEDEC standard board (76.2×114.3×1.6mm, two layer, FR-4).
(Note3) Mounted on the EIA/JEDEC standard board (76.2×114.3×1.6mm, four layer, FR-4).
■RECOMMENDED
OPERATING VOLTAGE
(Ta=25°C)
PARAMETER
Supply Voltage
SYMBOL
V /V
+
-
RATING
MIN.
±6
TYP.
-
MAX.
±16
UNIT
V
■ELECTRONIC
CHARACTERISTICS
+ -
•
DC CHARACTERISTICS (V
/V =±15V, Ta=-40 to +85°C (Note4) unless otherwise specified)
PARAMETER
Input Offset Voltage Drift
Input Offset Voltage1
Input Offset Voltage2
Input Offset Voltage3
Common Mode Rejection Ratio
Supply Voltage Rejection Ratio
Input Common Mode Voltage Range 1
Input Common Mode Voltage Range 2
Input Bias Current 1
Input Bias Current 2
Input Offset Current 1
Input Offset Current 2
Voltage Gain 1
Voltage Gain 2
Maximum Output Voltage 1
Maximum Output Voltage 2
Supply Current
SYMBOL
∆V
IO
/∆T
V
IO1
V
IO2
V
IO3
CMR
SVR
V
ICM1
V
ICM2
I
B1
I
B2
I
IO1
I
IO2
Av1
Av2
V
OM1
V
OM2
Icc
NJM2748A
NJM2748
R
S
=50Ω, Ta=+85°C
R
S
=50Ω, Ta=+25°C
R
S
=50Ω, Ta=−40°C
V
ICM
=±10V
V /V =±6V ~ ±16V
CMR≥76dB
CMR≥76dB
Ta=+25°C
Ta=+85°C
Ta=+25°C
Ta=+85°C
R
L
=2kΩ, Vo=±10V, Ta=+25°C
R
L
=2kΩ, Vo=±10V
R
L
=10kΩ
R
L
=2kΩ
Voltage Follower, R
L
=∞
(Note7)
+
−
CONDITION
(Note5, 6)
(Note6, 7)
(Note6, 7)
(Note6, 7)
(Note8)
(Note7, 9)
(Note10)
(Note10)
(Note7)
(Note7)
(Note7)
(Note7)
MIN.
−
−
−
−
−
76
80
+10
−
−
−
−
−
88
82
±12
±10
−
TYP.
6
6
0.6
0.7
0.9
92
100
+14.5
−11
50
−
25
−
100
100
±13.5
±11.5
2.0
MAX.
20
−
2.0
2.0
3.0
−
−
−
−10
200
4
100
2
−
−
−
−
3.4
UNIT
µV/°C
mV
mV
mV
dB
dB
V
V
pA
nA
pA
nA
dB
dB
V
V
mA
-2-
Ver.2007-05-24
NJM2748/2748A
(Note4) These devices are measured under three temperature conditions of Ta=−40°C, +25°C, +85°C.
(Note5) Temperature coefficient is calculated by specified change in offset voltage. (Changes Ta=+25°C to
−40°C
and Ta=+25°C to +85°C)
NJM2748A is guaranteed maximum specification because these are 100% tested to operating temperature range.
NJM2748 is guaranteed only typical specification.
(Note6) Written by the absolute rate.
(Note7) Measured at V
ICM
=0V
(Note8) CMR is calculated by specified change in offset voltage. (V
ICM
=0V to +10V and V
ICM
=0V to
−10V)
+
−
(Note9) SVR is calculated by specified change in offset voltage. (V /V =±6V to ±16V)
(Note10) V
ICM
is input common mode voltage when tested meets specified change in offset voltage is CMR≥76dB.
(A point of reference is offset voltage of V
ICM
=0V)
•
AC CHARACTERISTICS
(V /V
−
=±15V, Ta=+25°C unless otherwise specified)
PARAMETER
Gain Bandwidth Product
Unity Gain Frequency
Phase Margin
Input Noise Voltage1
Input Noise Voltage2
Total Harmonic Distortion
SYMBOL
GB
f
T
Φ
M
V
NI1
V
NI2
THD
f=10kHz
AV=+100, R
S
=100Ω, RL=∞, CL=10pF
AV=+100, R
S
=100Ω, RL=∞, CL=10pF
f=1kHz, A
V
=+100, RS=100Ω, RL=∞
RIAA, R
S
=2.2kΩ, 30kHz, LPF
f=1kHz, A
V
=+10, R
S
=1kΩ, R
L
=∞, V
O
=5Vrms
CONDITION
MIN.
−
−
−
−
−
−
TYP.
2.2
2
55
20
2.5
0.005
MAX.
−
−
−
−
−
−
UNIT
MHz
MHz
deg
nV/√Hz
µVrms
%
+
•
TRANSIENT CHARACTERISTICS
(V /V =±15V, Ta=+25°C unless otherwise specified)
PARAMETER
Positive Slew Rate
Negative Slew Rate
SYMBOL
+SR
-SR
CONDITION
A
V
=+1, V
IN
=2Vpp, R
L
=10kΩ, C
L
=10pF
A
V
=+1, V
IN
=2Vpp, R
L
=10kΩ, C
L
=10pF
MIN.
−
−
TYP.
14
12
MAX.
−
−
UNIT
V/µs
V/µs
+
-
Ver.2007-05-24
-3-
NJM2748/2748A
■IMPORTANT
CONSIDERATIONS FOR USE OF NJM2748/2748A
•
Supply Current
When Ta≥25°C, Power Dissipation P
D
is limited by junction temperature (T
J
=125°C)
So maximum supply current is influenced by package, mounting board (board size, area of cupper foil), Mounting condition and
etc.
Following DMP8 Power Dissipation characteristic is a characteristic when mounted the following conditions supply.
• Two layer board: EIA/JEDEC 76.2×114.3×1.6mm, FR-4
• Four layer board: EIA/JEDEC 76.2×114.3×1.6mm, FR-4
Please refer to "Method of measuring the package thermal characteristic" published in our company web site for detailed
information on the thermal characteristic.
Maximum Power Dissipation
−
Ambient Temperature
600
Power Dissipation P
D
[mW]
(DMP8)
EIA/JEDEC
4-Layer
Maximum Power Dissipation
−
Ambient Temperature
600
Power Dissipation P
D
[mW]
(DIP8)
500
400
300
200
100
0
0
EIA/JEDEC
2-Layer
500
400
300
200
100
0
Package
Only
20
40
60
80
100
0
20
40
60
80
100
Ambient Temperature [ºC]
Ambient Temperature [ºC]
•
THE OSCILLATION WITH A CAPACITIVE LOAD
NJM2748/2748A tends to oscillate easily when it uses voltage-follower, and driving capacitive load.
The figure below is a “Voltage Gain - Frequency characteristic” in the Voltage-Follower. (It is not the one to guarantee the
characteristic of the product.)
Especially, it becomes easy to oscillate in the condition that the input voltage (output voltage) is near the minus supply voltage
side and the condition with large output sink current. We will recommend use by some circuit gains.
(V
+
/V
−
=±15V, Voltage Follower,
C
L
=100pF, I
SINK
=1mA, Ta=25ºC)
Voltage Gain
−
Frequency
+
−
15
15
(V
+
/V
−
=±15V, Voltage Follower,
C
L
=100pF, V
O
=−
10V,
Ta=25ºC)
−
Voltage Gain
−
Frequency
+
−
Voltage Gain [dB]
V
O
=-10V
Voltage Gain [dB]
10
10
I
SINK
=5mA
I
SINK
=2mA
5
V
O
=0V
5
I
SINK
=1mA
0
V
O
=+10V
0
-5
10k
100k
1000k
1M
Frequency [HZ]
10000k
10M
-5
10k
100k
1000k
1M
Frequency [HZ]
10000k
10M
-4-
Ver.2007-05-24
NJM2748/2748A
■IMPORTANT
CONSIDERATIONS FOR USE OF NJM2748/2748A
•
INPUT COMMON MODE VOLTAGE RANGE
In this product, the input offset voltage drift is measured based on the input offset voltage at V
ICM
=0V, and the input voltage
range that satisfies the common mode rejection ratio 76dB is defined as the input common mode voltage range.
+
−
As an electric characteristic, V
ICM
=−10V~+10V at Supply Voltage V /V =±15V is guaranteed.
It becomes below formula about the input common mode voltage range when the supply voltage changes.
+
+V
ICM
: (V supply)
−
5 [V] · · · reference
−
−V
ICM
: (V supply) + 5 [V] · · · reference
This figure below is “Input common mode voltage range – Supply voltage characteristics”. (It is not the one to guarantee the
characteristic of the product.)
+
+ V
ICM
is limited by the absolute maximum rating (V supply) within the input common mode voltage range.
Moreover,
−V
ICM
tends to rise by lowering of the supply voltage.
Common Mode Input Voltage Range (+V
ICM
)
−
Supply Voltage
1.0
(Ta=25ºC, CMR=76dB)
Common Mode Input Voltage Range (−V
ICM
)
−
−
Supply Voltage
5.0
(Ta=25ºC, CMR=76dB)
0.0
(
−
V
ICM
)
−
(V
−
Supply) [V]
(V Supply)
−
(+V
ICM
) [V]
4.0
-1.0
3.0
+
-2.0
5
10
+
2.0
15
−
20
5
10
+
15
−
20
Supply Voltage V /V [V]
Supply Voltage V /V [V]
Ver.2007-05-24
-5-
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