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参数资料
| 型号： | PGA2500IDBRG4 |
| 英文描述： | Digitally Controlled Microphone Preamplifier |
| 中文描述： | 数控麦克风前置放大器 |
| 文件页数： | 11/17页 |
| 文件大小： | 206K |
| 代理商： | PGA2500IDBRG4 |
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SBOS289A NOVEMBER 2003 REVISED DECEMBER 2003
www.ti.com
11
APPLICATION INFORMATION
This section provides practical information for designing
the PGA2500 into end applications.
BASIC CIRCUIT CONFIGURATION
A typical applications circuit, without the input and output
circuitry, is shown in Figure 6. Power-supply bypass and
DC servo capacitors are shown with recommended
values. All capacitors should be placed as close as
possible to the PGA2500 package to limit inductive noise
coupling. Surface-mount capacitors are recommended
(X7R ceramic for the 0.1
μ
F and 1
μ
F capacitors, and low
ESR tantalum for the 4.7
μ
F capacitors).
The PGA2500 can be placed on a split ground plane, with
the package located over the split. However, there must be
a low impedance connection between the analog and
digital grounds at a common return point.
The DC common-mode input, V
COM
IN (pin 25), can be
connected to analog ground or a DC voltage (such as the
reference or common voltage output of an audio ADC).
When biasing this input to a DC voltage, keep in mind that
both the analog output and input pins are level-shifted by
the value of the bias voltage.
GPO1
GPO2
GPO3
GPO4
OVR
1
2
3
4
5
PGA2500
To
Relay Drivers,
Switches, or Indicators
AGND
28
DGND
6
To/From
MPU, MCU,
DSP, or Logic
DCEN
0dB
ZCEN
SDI
CS
SCLK
V
OUT
+
V
OUT
10
11
12
VD
14
VA
15
To
Analog Output
Circuit
17
16
V
IN
+
V
IN
From
Analog Input
Circuit
To
Optional
CommonMode
Voltage
0
(1)
27
26
SDO
13
7
8
9
C
S21
C
S22
22
21
10
0.1
μ
F
VA
VA
20
0.1
μ
F
0.1
μ
F
+
4.7
μ
F
+
4.7
μ
F
VA
19
0.1
μ
F
1
μ
F
C
S11
C
S12
24
23
1
μ
F
VA
VA+
18
0.1
μ
F
+
4.7
μ
F
V
COM
IN
25
= Analog Ground
= Digital Ground
0.1
μ
F
(1)
NOTE: (1) Install a 0
shunt or jumper only when connecting V
IN
to analog ground. Install a 0.1
μ
F ceramic capacitor (X7R type) only
when connecting V
COM
IN to a DC commonmode voltage source.
Connect Digital and Analog Grounds at
one common return point in the circuit.
Figure 6. Basic Circuit Configuration for the PGA2500
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PGA2505 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Digitally-Controlled MICROPHONE PREAMPLIFIER |
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| PGA2505IDBR | 功能描述:传声器前置放大器 Dig-Controlled Micro phone Preamp RoHS:否 制造商:Texas Instruments 可用增益调整:Digital control, 65 dB to 0 dB 共模抑制比（最小值）: 输入补偿电压: 最大输入电阻:9200 Ohms 最大工作温度:+ 85 C 封装 / 箱体:SSOP-28 封装:Tube |
| PGA256H009B5-2018R | 制造商:FCI 功能描述: |
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