AMPLIFIER BT272/BT274

DUAL/QUAD LOW POWER CMOS OPERATIONAL
AMPLIFIER
BT272/BT274
APPLICATIONS
FEATURES
• Portable Instruments
• Low Power Replacement for Standard OP Amps
• Battery-Powered Systems
• Wide supply operating range (1.4V to 7V)
• Transducer Interfacing
• Input common-mode voltage range includes negative rail
• High Impedance Buffer
• Output swing to rail
• Low input bias current (typical 1ρA)
• High input impedance
• Single supply operation
• Internal compensated
• Output short circuit protection
DESCRIPTION
The BT272/BT274 is a dual/quad low power CMOS operational amplifiers IC which provides high performance operation
at low supply voltages. The basic amplifier can operate at supply voltage as low as 1.4V with very low power consumption and
makes it perfect for battery-powered application. The input common-mode voltage extends to the negative rail. The output swings
to both rails with light load. The input bias current is inherently low and the input impedance is extremely high. The devices are
ideal upgrades for industrial standards operational amplifiers.
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Value
Unit
Power Supply Voltage
VCC
8
V
Input Voltage
VIN
-0.3 to VCC + 0.3
V
Output Shot Circuit to GND
ISC
Continuous
Operating Temperature Range
Topr
0 ~ +70
oC
Storage Temperature Range
Tstg
-65 ~ +150
oC
ELECTRICAL CHARACTERISTICS
(VCC = 5.0V, TA = 25 oC, unless otherwise specified)
Characteristic
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Input Common Mode Voltage Range
Symbol
VIO
Test Condition
VICM =0V to VCC-1.5V
Typ
Max
2.0
5.0
Unit
mV
ΔVIO/ΔT
0.7
μV/oC
IIO
1
ρA
IIB
ICC
Large Signal Voltage Gain
AV
0
VOL
VCC$1.3
5
VO=1V to 2V; VIN=1.4V; RL=1MΩ
VIN=10mV; RL=1MΩ (to V-)
VOH
ρA
1
VICR
Supply Current (per amplifier)
Output Voltage Swing
Min
20
70
4.95
4.99
VIN=10mV; RL=10KΩ (to V-)
4.77
VIN=10mV; RL=1MΩ (to V+)
0.05
μA
9
V/mV
V
0.1
Common Mode Rejection Ratio
CMRR
60
80
dB
Output Current
Isource
0.8
1.5
mA
Isink
6
14
μA
Differential Input Voltage
Unit Gain Bandwidth
VO=1V; VIN=0V to 2.0V;
V
±VCC
VID
GBW
RL=1MΩ, CL=50pF
V
0.001
MHz
JULY • 2005
1
AMPLIFIER
BT272/BT274
DUAL/QUAD LOW POWER CMOS OPERATIONAL
BT272 PAD ASSIGNMENT
OUTB
-INB
7
6
V+
+INB
8
5
BT272
OUTA
V-
1
4
-INA
+INA
2
3
BT274 PAD ASSIGNMENT
-IND
+IND
V-
+INC
-INC
13
12
11
10
9
OUTD
OUTC
14
8
BT274
OUTA
OUTB
7
1
2
-INA
3
+INA
4
V+
5
+INB
6
-INB
JULY • 2005
2
AMPLIFIER
BT272/BT274
DUAL/QUAD LOW POWER CMOS OPERATIONAL
TYPICAL APPLICATION CIRCUIT
• VOLTAGE FOLLOWER
VIN
VOUT
RL>100K
• INSTRUMENT AMPLIFIER
1M
200K
1M
200K
INPUT
VOUT
100K
200K
2M
2M
1M
V+
V-
NOTE: The chip substrate is electrically connected to VSS.
JULY • 2005
3
AMPLIFIER
BT272/BT274
DUAL/QUAD LOW POWER CMOS OPERATIONAL
PAD LAYOUT
Chip size: 900 x 1000
Pad size : 110 x 110
Unit
: μm
NOTE: The chip substrate is electrically connected to VSS.
PAD LOCATION
( Unit: μm)
Pad No.
Pad Name
X
Y
1
OUTA
-305
-75
2
-INA
-260
-295
3
+INA
250
-310
4
V-
250
-105
5
+INB
250
75
6
-INB
250
305
7
OUTB
-305
355
8
V+
-305
140
JULY • 2005
4
AMPLIFIER
BT272/BT274
DUAL/QUAD LOW POWER CMOS OPERATIONAL
PAD LAYOUT
Chip size: 1250 x 1200
Pad size : 110 x 110
Unit
: μm
NOTE: The chip substrate is electrically connected to VSS.
PAD LOCATION
( Unit: μm)
Pad No.
Pad Name
X
Y
1
OUTA
-450
-175
2
-INA
-410
-405
3
+INA
-200
-405
4
V+
0
-405
5
+INB
200
-405
6
-INB
410
-405
7
OUTB
450
-175
8
OUTC
450
165
9
-INC
410
395
10
+INC
200
395
11
V-
0
395
12
+IND
-200
395
13
-IND
-410
395
14
OUTD
-450
165
JULY • 2005
5