ATJ2073 ETC, ATJ2073 Datasheet - Page 24

• Manufacturer Part Number: ATJ2073
• Description: The Atj2073 is a Single-chip Highly-intergrated Digital Music System Solution for Devices such as Dedicated Audio Players, Pdas, and cell Phones
• Manufacturer: ETC

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44.1
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MPEG 2
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5.6 Microphone Interface
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Microphone interface is composed of microphone pre-amplifier and 16-bit ADC.
Microphone pre-amplifier has 35db gain at least for suitable recording volume so the noise of microphone
power supply must be very low. It is composed of a regulator and an external first order RC LPF. AGC
function is implemented by a variable gain amplifier and 4 register bits (MCU code control).
The ADC adopts switched-capacitor successive approximation method. Its input is from microphone pre-
amplifier’s output. Function enable, sampling frequency select, and some other control signals are all from
ATJ2073
40
16
48
48
64
48
24
56
56
96
Table 1.
Table 2.
Table 3.
56
32
64
64
128
64
40
80
80
160
Sample rates and Bit rates of Layer III supported
Sample rates and Bit rates of Layer II supported
Sample rates and Bit rates of Layer I supported
80
48
96
96
192
96
56
112
112
224
112
64
128
128
256
128
80
160
144
288
160
96
192
160
320
192
112
224
176
352
Actions Semiconductor Co.,LTD
224
128
256
192
384
256
144
320
224
416
320
160
384
256
448
Data Sheet