ADA4075-2 Analog Devices, ADA4075-2 Datasheet - Page 17

• Manufacturer Part Number: ADA4075-2
• Description: Ultralow Noise Amplifier at Lower Power
• Manufacturer: Analog Devices

Specifications of ADA4075-2

• -3db Bandwidth: 6.5MHz
• Slew Rate: 12V/µs
• Vos: 300µV
• Ib: 30nA
• # Opamps Per Pkg: 2
• Input Noise (nv/rthz): 2.8nV/rtHz
• Vcc-vee: 24V to 36V
• Isy Per Amplifier: 1.8mA
• Packages: CSP,SOIC

Data Sheet
DAC OUTPUT FILTER
The ultralow voltage noise, low distortion, and high slew rate of
the ADA4075-2 make it an ideal choice for professional audio
signal processing. Figure 66 shows the ADA4075-2 used in a
typical audio DAC output filter configuration. The differential
outputs of the DAC are fed into the ADA4075-2. The ADA4075-2
is configured as a differential Sallen-Key filter. It operates as an
external low-pass filter to remove high frequency noise present
on the output pins of the DAC. It also provides differential-to-
single-ended conversion from the differential outputs of the DAC.
DAC OUTN
DAC OUTP
5.62kΩ
11kΩ
Figure 66. Typical DAC Output Filter Circuit (Differential)
560pF
5.62kΩ
Rev. B | Page 17 of 24
270pF
3.01kΩ
1.5kΩ
11kΩ
150pF
68pF
1/2
ADA4075-2
For a DAC output filter, an op amp with reasonable slew rate and
bandwidth is required. The ADA4075-2 has a high slew rate of the
12 V/μs and a relatively wide bandwidth of 6.5 MHz. The cutoff
frequency of the low-pass filter is approximately 167 kHz. In
addition, the 100 kΩ − 47 μF RC network provides ac coupling
to block out the dc components at the output.
100Ω
2.2nF
47µF
100kΩ
OUTPUT
ADA4075-2