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596288565013A Datasheet(PDF) 13 Page - Analog Devices

Part # 596288565013A
Description  Very Low Noise Quad Operational Amplifier
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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596288565013A Datasheet(HTML) 13 Page - Analog Devices

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REV. B
OP470
–13–
10
0%
100
90
Figure 14. Noise Density of Low Noise Amplifier, G = 1000
DIGITAL PANNING CONTROL
Figure 15 uses a DAC-8408, quad 8-bit DAC to pan a signal
between two channels. The complementary DAC current out-
puts two of the DAC-8408’s four DACs drive current-to-voltage
converters built from a single quad OP470. The amplifiers have
complementary outputs with the amplitudes dependent upon
the digital code applied to the DAC. Figure 16 shows the comple-
mentary outputs for a 1 kHz input signal and digital ramp applied
to the DAC data inputs. Distortion of the digital panning con-
trol is less than 0.01%.
10
0%
100
90
1ms
5V
5V
A OUT
A OUT
Figure 16. Digital Panning Control Output
Gain error due to the mismatching between the internal DAC
ladder resistors and the current-to-voltage feedback resistors is
eliminated by using feedback resistors internal to the DAC. Of
the four DACs available in the DAC-8408, only two DACs, A
and C, actually pass a signal. DACs B and D are used to pro-
vide the additional feedback resistors needed in the circuit. If
the VREFB and VREFD inputs remain unconnected, the
current-to-voltage converters using RFBB and RFBD are unaf-
fected by digital data reaching DACs B and D.
1/4
OP470E
+15V
–15V
1/4
OP470E
A OUT
20pF
A OUT
20pF
IOUT1A
DAC A
IOUT1B
DAC B
RFBA
IOUT2A/2B
RFBB
RFBC
1/4
OP470E
B OUT
20pF
DAC C
IOUT1C
1/4
OP470E
B OUT
20pF
IOUT1D
DAC D
RFBD
IOUT2C/2D
VREFA
DAC SELECT
1k
1k
5V
DGND
DS2
DS1
R/W
A/B
VREFC
VDD
DAC-8408GP
SIDE A IN
SIDE B IN
DAC DATA BUS
PINS 9 (LSB) – 16 (MSB)
5V
Figure 15. Digital Panning Control Circuit


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