TS472IQT STMicroelectronics

TS472 Very low noise microphone preamplifier with 2.0 V bias output and active low standby mode Features Flip-chip - 12 bumps Low noise: 10 nV/Hz typ. equivalent input noise at F = 1 kHz Fully-differential input/output 2.2 to 5.5 V single supply operation Low power consumption at 20 dB: 1.8 mA Fast start up time at 0 dB: 5 ms typ. Pin connections (top view) Low distortion: 0.1% typ. 40 kHz bandwidth regardless of the gain Active low standby mode function (1 A max) Low noise 2.0 V microphone bias output Available in flip-chip lead-free package and in QFN24 4 x 4 mm package ESD protection (2 kV) Applications QFN24 Video and photo cameras with sound input Sound acquisition and voice recognition Video conference systems Notebook computers and PDAs Pin connections (top view) Description NC NC GND STBY VCC NC The TS472 is a differential-input microphone 24 23 22 21 20 19 preamplifier optimized for high-performance PDA and notebook audio systems. NC 1 18 NC This device features an adjustable gain from 0 to BYP 2 17 OUT+ 40 dB with excellent power-supply and common- 3 NC 16 OUT- mode rejection ratios. In addition, the TS472 has GND 4 15 C2 a very low noise microphone bias generator of 2V. 5 14 IN- C1 It also includes a complete shutdown function, 6 13 NC NC with active low standby mode. 7 8 9 10 11 12 NC IN+ GS BIAS NC NC August 2009 Doc ID 11015 Rev 6 1/25 www.st.com 25Contents TS472 Contents 1 Typical application schematic . 3 2 Absolute maximum ratings . 5 3 Electrical characteristics . 6 4 Application information . 13 4.1 Differential configuration principle 13 4.2 Higher cut-off frequency 13 4.3 Lower cut-off frequency 14 4.4 Low-noise microphone bias source . 14 4.5 Gain settings 15 4.6 Wake-up time 16 4.7 Standby mode . 17 4.8 Layout considerations 17 4.9 Single-ended input configuration . 17 4.10 Demonstration board 18 5 Package information 19 5.1 Flip-chip package information . 19 5.2 QFN24 package information 21 6 Ordering information . 23 7 Revision history . 24 2/25 Doc ID 11015 Rev 6