OP270GPZ Analog Devices Inc, OP270GPZ Datasheet - Page 17
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OP270GPZ
Manufacturer Part Number
OP270GPZ
Description
IC OPAMP GP 5MHZ DUAL PREC 8DIP
Manufacturer
Analog Devices Inc
Type
General Purpose Amplifierr
Specifications of OP270GPZ
Slew Rate
2.4 V/µs
Amplifier Type
General Purpose
Number Of Circuits
2
Gain Bandwidth Product
5MHz
Current - Input Bias
15nA
Voltage - Input Offset
50µV
Current - Supply
4mA
Voltage - Supply, Single/dual (±)
±4.5 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Op Amp Type
Low Noise
No. Of Amplifiers
2
Bandwidth
5MHz
Supply Voltage Range
± 4.5V To ± 18V
Amplifier Case Style
DIP
No. Of Pins
8
Channel Separation
175
Common Mode Rejection Ratio
110
Current, Input Bias
15 nA
Current, Input Offset
5 nA
Current, Supply
4 mA
Impedance, Thermal
37 °C/W
Number Of Amplifiers
Dual
Package Type
PDIP-8
Resistance, Input
0.4 Megohms (Differential), 20 Gigaohms (Common-Mode)
Temperature, Operating, Range
-40 to +85 °C
Voltage, Gain
1500 V/mV
Voltage, Input
±12.5 V
Voltage, Noise
3.6 nV/sqrt Hz
Voltage, Offset
50 μV
Voltage, Output, High
+13.5 V
Voltage, Output, Low
-13.5 V
Voltage, Supply
±15 V
Rail/rail I/o Type
No
Number Of Elements
2
Unity Gain Bandwidth Product
5MHz
Input Offset Voltage
250uV
Input Bias Current
60nA
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
±5/±9/±12/±15V
Voltage Gain In Db
123.52dB
Power Supply Rejection Ratio
116.48dB
Power Supply Requirement
Dual
Shut Down Feature
No
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
±4.5V
Dual Supply Voltage (max)
±18V
Technology
Bipolar
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Current - Output / Channel
-
-3db Bandwidth
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
OP270GPZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
DIGITAL PANNING CONTROL
Figure 44 uses a
signal between two channels. One channel is formed by the
current output of DAC A driving one-half of an OP270 in a
current-to-voltage converter configuration. The other channel
is formed by the complementary output current of DAC A,
which normally flows to ground through the AGND pin. This
complementary current is converted to a voltage by the other
half of the OP270, which also holds AGND at virtual ground.
Gain error due to mismatching between the internal DAC
ladder resistors and the current-to-voltage feedback resistors is
eliminated by using feedback resistors internal to the DAC8221.
Only DAC A passes a signal; DAC B provides the second
feedback resistor. With V
voltage converter, using R
digital data reaching DAC B. Distortion of the digital panning
control is less than 0.002% over the 20 Hz to 20 kHz audio
range. Figure 45 shows the complementary outputs for a 1 kHz
input signal and a digital ramp applied to the DAC data input.
DUAL PROGRAMMABLE GAIN AMPLIFIER
The dual OP270 and the DAC8221 (a dual 12-bit CMOS DAC)
can be combined to form a space-saving, dual programmable
amplifier. The digital code present at the DAC, which is easily
set by a microprocessor, determines the ratio between the internal
feedback resistor and the resistance that the DAC ladder presents
to the op amp feedback loop. Gain of each amplifier is
where n is the decimal equivalent of the 12-bit digital code
present at the DAC.
If the digital code present at the DAC consists of all 0s, the
feedback loop opens, causing the op amp output to saturate. A
20 MΩ resistor placed in parallel with the DAC feedback loop
eliminates this problem with only a very small reduction in gain
accuracy.
V
V
IN
O
=
−
4096
n
DAC8221
REF
FBB
(a dual 12-bit CMOS DAC) to pan a
B unconnected, the current-to-
, is accurate and not influenced by
Rev. E | Page 17 of 20
CONTROL
WRITE
A OUT
A OUT
PINS 6 (MSB) TO 17 (LSB)
V
NC
IN
DAC DATA BUS
22
18
19
20
4
V
V
DAC A/DAC B
CS
WR
DAC8221P
REF
REF
5V
Figure 45. Digital Panning Control Output
A
B
Figure 44. Digital Panning Control
5V
DAC A
DAC B
DGND
+5V
V
DD
21
5
AGND
I
I
R
R
OUT
OUT
FBA
FBB
A
B
23
24
3
2
1
2
3
6
5
OP270GP
OP270GP
+15V
–15V
1/2
1/2
8
4
1ms
+
–
1
7
0.01µF
10µF
0.1µF
OP270
+
–
10µF
OUT
OUT