Datasheet OP777, OP727, OP747 (Analog Devices) - 10

OP777/OP727/OP747 14.964 14.930 1.5 VSY = 15V VSY = 15V 14.962 V I SY = 15V L = 1mA IL = 1mA V 14.935 1.0 CM = 0V 14.960 TA = 25 C 14.958 14.940 0.5 14.956 V – 14.954 14.945 0 OSV 14.952 14.950 0.5 14.950 OUTPUT VOLTAGE HIGH – V 14.948 OUTPUT VOLTAGE LOW – V 14.955 1.0 14.946 14.944 14.960 1.5 60 40 20 0 20 40 60 80 100 120 140 60 40 20 0 20 40 60 80 100 120 140 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TEMPERATURE – C TEMPERATURE – C TIME – Minutes
TPC 46. Output Voltage High vs. TPC 47. Output Voltage Low vs. TPC 48. Warm-Up Drift Temperature Temperature
BASIC OPERATION
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
VOUT
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
0V
1 V of the positive supply rail. The epitaxial PNP input structure
VIN
provides high breakdown voltage, high gain, and an input bias cur-
VOLTAGE – 100mV/DIV
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.
TIME – 0.2ms/DIV Supply Voltage
Figure 1. Input and Output Signals with VCM < 0 V The amplifiers are fully specified with a single 5 V supply and, due to design and process innovations, can also operate with a supply
100k
voltage from 3.0 V up to 30 V. This allows operation from most split supplies used in current industry practice, with the advantage
100k +3V
of substantially increased input and output voltage ranges over conventional split-supply amplifiers. The OP777/OP727/OP747
0.27V
series is specified with (V
100k
SY = 5 V, V– = 0 V and VCM = 2.5 V which is most suitable for single-supply application. With PSRR of
OP777/ 100k
130 dB (0.3 μV/V) and CMRR of 110 dB (3 μV/V) offset is mini-
OP727/ OP747
mally affected by power supply or common-mode voltages. Dual
0.1V
supply, ±15 V operation is also fully specified.
VIN = 1kHz at 400mV p-p Input Common-Mode Voltage Range
Figure 2. OP777/OP727/OP747 Configured as a Differ- The OP777/OP727/OP747 is rated with an input common-mode ence Amplifier Operating at V voltage which extends from the minus supply to within 1 V of the CM < 0 V positive supply. However, the amplifier can still operate with input voltages slightly below VEE. In Figure 2, OP777/OP727/OP747 is configured as a difference amplifier with a single supply of 3.0 V 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. –10– REV. D Document Outline GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS SIMILAR LOW POWER PRODUCTS ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Typical Performance Characteristics BASIC OPERATION OUTLINE DIMENSIONS ORDERING GUIDE REVISION HISTORY