ST CCA023V1 User Manual

STEVAL-CCA023V1

Demonstration board for low noise microphone preamplifier with 2 V bias based on the TS472

Features

■Low noise: 10 nV / √Hz typ. equivalent input noise @ F=1 kHz

■Fully differential input/output

■2.2 V to 5.5 V single supply operation

■Low power consumption @20 dB: 1.8 mA

■Fast start up time @ 0dB: 5 ms typ.

■Low distortion: 0.1% typ.

■40 kHz bandwidth @ -3 dB and adjustable gain

■Active low standby mode function (1µA max)

■Low noise 2.0 V microphone bias output

■Available in flip-chip ECOPACK® package and QFN24 4x4 mm

Data brief

STEVAL-CCA023V1

■ESD protection (2 kV)

■RoHS compliant

Description

The STEVAL-CCA023V1 demonstration board is designed as an evaluation platform for the TS472 low noise microphone preamplifier with 2.0 V bias and active low standby mode.

The board supports customization of the testing conditions, allowing the gain of the TS472 device to be adjusted, or an electret microphone to be biased either externally or using the TS472 builtin 2.0 V bias voltage.

August 2009	Doc ID 16138 Rev 1	1/4
For further information contact your local STMicroelectronics sales office.		www.st.com

2/4																							schematicboardDemonstration.1Figure	1	Schematic
Rev16138IDDoc						Jumper J4				2		C13	C21											circuitSchematic	circuit
	P10					P11	Vbias	P5			VCC			C1				C9
	1							1
														1	2		1		2
	2			2		2 1		2												1			P2
	Vx							Vcc						100pF				100nF		R9
					R10				1	1											POS. OUTPUT		4
										C6	C7									100k
																							3
											1uF										NEG. OUTPUT
				1			Bias			100nF										2			2
									2
														C2				C8					1
		1		2											2		1		2				OUTPUT
			C10		R6									1						1
			1uF											100pF				100nF		R8
		2
																				100k
				1
											14
														TS472_Adapter						2
						C4
											Vcc
	P1					1	2
	4	POS. INPUT				100nF		6	IN+					OUT+		13
	3																		Jumper J2
		NEG. INPUT												OUT-
	2							8	IN-							12
	1					C5
	INPUT					1	2							GAIN
						100nF										5			P8
1													Gain	SELECT							Bias		diagram
																			8	7
		1	C11	121	R11						GND		STDBY				12
																	Bias
																	Min		6	5
					R7			Bias 4	BIAS					BYPASS		10	Max		4	3
													Bias				Rgs		2	1
																	C3		Gain Select
																	1uF					R1
																					1		2
																						470k
		2		2							9		15						P9		1	R2	2
																						27k
																	470k		1	2
																	27k		3	4	1	R3	2
											P6	VCC					4k7		5	6	1	R5	2		-STEVAL
										Jumper J1							1k		7	8		4.7k
											1						68R		9	10		R4
											2								Rgs		1		2
											3											1k
											StandBy
																									CCA023V1
																			Jumper J3			68