ADA4075-2 Analog Devices, ADA4075-2 Datasheet - Page 20

• 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

ADA4075-2
LOW NOISE PARAMETRIC EQUALIZER
The circuit in Figure 69 is a reciprocal parametric equalizer
yielding ±20 dB of cut or boost with variable bandwidth and
frequency. The frequency control range is 6.9:1, with the geometric
mean center frequency conveniently occurring at the midpoint
of the potentiometer setting. The center frequency is equal to
48 Hz/Ct, where Ct is the value of C1 and C2 in microfarads.
*THE CENTER FREQUENCY IS AFFECTED BY THE VALUE OF C1 AND C2
1.5kΩ
2.5kΩ
(SEE THE LOW NOISE PARAMETRIC EQUALIZER SECTION FOR MORE DETAILS).
IN
47µF
2.5kΩ
1/2
ADA4075-2
ADA4075-2
6.2kΩ
BOOST
2.5kΩ
620Ω
6.2kΩ
620Ω
Figure 69. Low Noise Parametric Equalizer
5kΩ
1/2
1.5kΩ
1.3kΩ
CUT
FREQUENCY (GANGED POTENTIOMETER)
Rev. B | Page 20 of 24
OUT
1/2
C1*
ADA4075-2
2.7kΩ
BANDWIDTH
The bandwidth control adjusts the Q from 0.9 to about 11. The
overall noise is setting dependent, but with all controls centered,
it is about −104 dBV in a 20 kHz bandwidth. Such a low noise
level can obviate the need for a bypass switch in many applications.
2.5kΩ
620Ω
100Ω
1kΩ
1.3kΩ
1/2
ADA4075-2
C2*
Data Sheet