OP727 Analog Devices, OP727 Datasheet - Page 10

• Manufacturer Part Number: OP727
• Description: Precision Rail-to-Rail Output Single Supply Dual Op Amp
• Manufacturer: Analog Devices

Specifications of OP727

• -3db Bandwidth: 700kHz
• Slew Rate: 200mV/µs
• Vos: 30µV
• Ib: 5.5nA
• # Opamps Per Pkg: 2
• Input Noise (nv/rthz): 15nV/rtHz
• Vcc-vee: 3V to 36V
• Isy Per Amplifier: 290µA
• Packages: SOIC,SOP

The OP777/OP727/OP747 amplifier uses a precision Bipolar
PNP input stage coupled with a high-voltage CMOS output
stage. This enables this amplifier to feature an input voltage
range which includes the negative supply voltage (often ground-
in single-supply applications) and also swing to within 1 mV of the
output rails. Additionally, the input voltage range extends to within
1 V of the positive supply rail. The epitaxial PNP input structure
provides high breakdown voltage, high gain, and an input bias cur-
rent figure comparable to that obtained with a “Darlington” input
stage amplifier but without the drawbacks (i.e., severe penalties for
input voltage range, offset, drift and noise). The PNP input structure
also greatly lowers the noise and reduces the dc input error terms.
The amplifiers are fully specified with a single 5 V supply and, due
to design and process innovations, can also operate with a supply
voltage from
split supplies used in current industry practice, with the advantage
of substantially increased input and output voltage ranges over
conventional split-supply amplifiers. The OP777/OP727/OP747
series is specified with (V
which is most suitable for single-supply application. With PSRR of
130 dB (0.3 V/V) and CMRR of 110 dB (3 V/V) offset is mini-
mally affected by power supply or common-mode voltages. Dual
supply, 15 V operation is also fully specified.
The OP777/OP727/OP747 is rated with an input common-mode
voltage which extends from the minus supply to within 1 V of the
positive supply. However, the amplifier can still operate with input
voltages slightly below V
configured as a difference amplifier with a single supply of
and negative dc common-mode voltages applied at the inputs
terminals. A 400 mV p-p input is then applied to the noninverting
input. It can be seen from the graph below that the output does not
show any distortion. Micropower operation is maintained by using
large input and feedback resistors.
14.964
14.962
14.960
14.958
14.956
14.954
14.952
14.950
14.948
14.946
14.944
TPC 46. Output Voltage High vs.
Temperature
60
40
3.0
20 0
V up to 30 V. This allows operation from most
TEMPERATURE – C
20 40
EE
SY
. In Figure 2, OP777/OP727/OP747 is
60 80 100 120
= 5 V, V– = 0 V and V
V
I
L
SY
= 1mA
=
15V
140
CM
TPC 47. Output Voltage Low vs.
Temperature
14.930
14.935
14.940
14.945
14.950
14.955
14.960
= 2.5 V
60
3.0
V
I
L
SY
40
= 1mA
=
V
20 0
15V
TEMPERATURE – C
–10–
20 40
Figure 2. OP777/OP727/OP747 Configured as a Differ-
ence Amplifier Operating at V
60 80 100 120
Figure 1. Input and Output Signals with V
V
OUT
V
0V
IN
0.27V
140
0.1V
100k
TIME – 0.2ms/DIV
1.5
1.0
0.5
0.5
1.0
1.5
0
100k
0
100k
V
TPC 48. Warm-Up Drift
IN
0.5
= 1kHz at 400mV p-p
CM
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
100k
< 0 V
+3V
TIME – Minutes
OP777/
OP727/
OP747
CM
V
V
T
SY
CM
A
= 25 C
< 0 V
=
= 0V
REV.
15V
5.0
D