DFG-30445-000 Knowles Acoustics, DFG-30445-000 Datasheet - Page 2

• Manufacturer Part Number: DFG-30445-000
• Description: MIC SUPER CARTOID UNI DIRECT FG
• Manufacturer: Knowles Acoustics
• Series: DFGr
• Type: Electret Condenserr

Specifications of DFG-30445-000

• Sensitivity: -69dB ±4dB
• Voltage - Rated: 1.3V
• Current: 50µA
• Size / Dimension: Circular - 2.56mm Dia x 2.69mm H
• S/n Ratio: -
• Filter Type: 13pF
• Impedance: 1.7K Ohm
• Frequency: 100Hz ~ 5kHz
• Termination: Solder Pads
• Direction: Unidirectional
• Port Location: Bottom and Top
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 423-1150

Construction
All three DFG models have the same external construction.
The height of DFG is slightly greater than FG due to the added thickness of the center plate.
Performance
The directional performance of DFG is 100% tested in production. For practical reasons, the production test uses a
holding fixture that makes contact with the microphone terminals. The fixture slightly increases the external delay
for the measurement. The measurement is made in a semi‐anechoic sound box to facilitate loading and unloading.
The production test condition is described on Sheet 2.1 of the model specification. Sheet 2.2 of the model
specification shows typical near field performance and directional performance in an anechoic chamber without a
test fixture.
Typical near field response is measured with the microphone 6mm above the aperture of a B&K Type 4227 Mouth
simulator. Typical far field and polar performance is measured 1m from the sound source in an anechoic chamber.
Typical Polar Performance is measured at 125Hz, 1kHz, 4kHz, and 10kHz.
Placing the microphone element in a housing will typically increase the distance between the front and rear port,
which will make a cardioid pattern look more like a supercardioid pattern, and increase near field sensitivity.
AMERICAS:
Knowles Acoustics
1151 Maplewood Drive
Itasca, IL 60143
U.S.A.
Phone: [phone]
Fax: [phone]
Port Spacing
EUROPE:
Knowles Acoustics
York Road, Burgess Hill
West Sussex, RH15 9TT
England
Phone: [phone]
Fax: [phone]
www.knowlesacoustics.com
JAPAN:
Knowles Electronics Japan, KK
2-2-16, Sangenjaya,
Setagaya-ku, Tokyo
154-0024 JAPAN
Tel. [phone]
Fax: [phone]
Application Note
ASIA:
Knowles Acoustics
5F, No. 129, Lane 235, Bauchiau Rd.
Shindian City, Taipei 231, Taiwan
Republic of China
Phone: [phone]
Fax: [phone]
2 of 9