參數(shù)資料
型號: TLV320AIC36IZQE
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA80
封裝: 5 X 5 MM, GREEN, PLASTIC, VFBGA-80
文件頁數(shù): 135/165頁
文件大?。?/td> 1895K
代理商: TLV320AIC36IZQE
AIC36
DETECT
EXT_MICBIAS
EXTMIC_P
EXTMIC_M
RBIAS
R1
R2
RN
AVDD
MICBIAS AMP
AIC36
LF
OSC
DETECT
DIVIDER 1
DETECT
DIVIDER 2
DETECT
SAR ADC
DETECT
WINDOW
COMPARATOR
SHORT PULSE
DETECT
DEBOUNCE
LONGPULSE
DETECT
DEBOUNCE
www.ti.com
SBAS387A – MAY 2009 – REVISED JUNE 2010
5. 47 Kohm resistor is placed from FC_NEG to GND to speed charge pump startup.
6. Register settings (see Section 5.21): all LDOs=off, Bias current = low power setting. DACSP =
PRB_P17, ADC CM=0.75V, ADC FS=0.83Vrms. REC,LO,HP gain=-5dB.
Referring to Table 5-20, adhere to the maximum clock frequencies listed for the ULP DVDD=1.5V mode.
5.19 Device Special Functions
5.19.1 Headset Detection
The DETECT input is used to monitor the external microphone bias for momentary connections to ground
using an external resistor and pushbutton. Multiple pushbuttons and resistors may be placed in parallel to
support detection of unique button presses as shown in Figure 5-49.
Figure 5-49. Microphone Bias Detection External Circuit
Unique values of R1, R2, through RN in series with RBIAS form a resistor voltage divider which can be
sensed by the DETECT pin. This document details the AIC36 detect circuit and programming features.
5.19.1.1 Overview
Internally, the detect circuit consists of a low frequency oscillator, clock dividers, 5-bit SAR ADC, window
comparator, and de-bounce functions as shown in Figure 5-50.
Figure 5-50. Detect Circuit Block Diagram
Copyright 2009–2010, Texas Instruments Incorporated
APPLICATION INFORMATION
71
Product Folder Link(s): TLV320AIC36
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