参数资料
| 型号： | AT73C209-EK |
| 厂商： | Atmel |
| 文件页数： | 43/63页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AT73C209 |
| 标准包装： | 1 |
| 系列： | PMAAC™ |
| 主要目的： | 电源管理，专用型: 手机 |
| 已用 IC / 零件： | AT73C209 |
| 已供物品： | 板，CD，文档 |
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AT73C209
11.4
11.5
Detailed Description
The OP065 is a two-stage class A amplifier with a nominal 40 dB gain. The gain can be reduced
simply by adding a resistor in serie with the MICINN input. Included input resistor is 2.2 KOhms.
Few external components are needed for a complete electret microphone preamplifier solution:
? Input capacitor between the microphone and the MICINN input of the OP065 (2.2 μF
recommended),
? Resistive bridge and the decoupling capacitor for the VCM common mode input (100 KOhms
+ 100 KOhms bypassed by a 10 μF capacitor recommended)
? Power supply decoupling capacitor for the microphone (10 μF recommended, on MICOUT)
The common mode is to be set externally to half supply. The output MICOUT is then centered to
half supply. It is self-biased.
The biasing of the electret microphone is included, through a 1.2 KOhms resistor in serie with
the VDDA supply, and available on MICOUT. This bias can be shut down by ONMIC input (bias
available with ONMIC = 1).
The MICINN input should be AC coupled to the microphone, its DC value is normally set to half
supply (as soon as VCM input is biased to half supply).
The output stage is a class A linear structure with an internal low quiescent current. This current
will be actually essentially fixed by the external load to be connected (DC coupled) between the
output (MICOUT) and the ground. A typical 50 KOhms load is recommended. A maximum
100pF load can be connected to the output.
The OP065 is not optimized for general buffer purpose.
The biasing of the electret microphone is included, through a 2.2 KOhms resistor in serie with
the VDDA supply, and available on MIC output.
The MICINN input should be AC coupled to the microphone, its DC value is set to half supply.
Electrical Specifications
T A = 25°C, VSUPPLY = 2.4V to 3.0V, unless otherwise specified.
Table 11-1.
Microphone Preamplifier (OP065) Electrical Specifications
Parameter
Operating Supply Voltage
Output swing
Voltage gain
Input impedance
Output offset voltage
Symbol
V ANA
Vc
Gv
Z IN
V OFF
Conditions
50 KOhms load
With an ideal voltage source
AC input coupling
Min
2.4
0.2
--
--
-10
Typ
2.8
--
40
2200
--
Max
3.0
Vana-0.2
--
--
10
Unit
V
V
dB
Ohms
mV
Output noise, 40dB gain,
without power
Supply and microphone
onoise
20 Hz - 20 KHz bandwidth, unweighted
50 kOhms // 100 pF load
--
-67
-62
dBV
contribution
Slew-rate
SR
50 kOhms // 100 pF load
± 0.2
--
± 0.4
V/μs
43
6365A–PMAAC–12-Mar-08
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