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參數(shù)資料
| 型號(hào)： | SA572D |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 0K |
| 描述： | IC COMPANDOR 2CHAN GAIN 16-SOIC |
| 產(chǎn)品變化通告： | Product Obsolescence 11/Feb/2009 |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 類型： | 壓縮擴(kuò)展器 |
| 應(yīng)用： | 自動(dòng)電平控制，立體聲擴(kuò)展器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 管件 |
SA572
http://onsemi.com
7
Basic Expandor
Figure 6 shows an application of the circuit as a simple
expandor. The gain expression of the system is given by:
VOUT
VIN
+ 2I
1
@
R3 @ VIN(AVG)
R2 @ R1
2
(eq. 4)
(I1 = 140 mA)
Both the resistors R1 and R2 are tied to internal summing
nodes. R1 is a 6.8 kW internal resistor. The maximum input
current into the gain cell can be as large as 140
mA. This
corresponds to a voltage level of 140
mA6.8 kW = 952 mV
peak. The input peak current into the rectifier is limited to
300
mA by the internal bias system. Note that the value of
R1 can be increased to accommodate higher input level. R2
and R3 are external resistors. It is easy to adjust the ratio of
R3/R2 for desirable system voltage and current levels. A
small R2 results in higher gain control current and smaller
static and dynamic tracking error. However, an impedance
buffer A1 may be necessary if the input is voltage driven
with large source impedance.
The gain cell output current feeds the summing node of
the external OPA A2. R3 and A2 convert the gain cell output
current to the output voltage. In high-performance
applications, A2 has to be low-noise, high-speed and wide
band so that the high-performance output of the gain cell
will not be degraded. The non-inverting input of A2 can be
biased at the low noise internal reference Pin 6 or 10.
Resistor R4 is used to bias up the output DC level of A2 for
maximum swing. The output DC level of A2 is given by:
V
OUT DC + VREF 1 )
R3
R4 *
VB
R3
R4
(eq. 5)
VB can be tied to a regulated power supply for a dual
supply system and be grounded for a single supply system.
CA sets the attack time constant and CR sets the recovery
time constant.
+
A1
(7,9)
(3,13)
(8)
(16)
(4,12)
(2,14)
(6,10)
(5,11)
BUFFER
A2
VOUT
VIN
CIN1
CIN2
CIN3
VREF
+VB
+VCC
DG
10mF
1mF
2.2mF
Figure 6. Basic Expandor Schematic
R5
100kW
R2
3.3kW
6.8kW
17.3kW
1kW
R4
R3
R1
R6
C1
CR
CA
2.2mF
Basic Compressor
Figure 7 shows the hook-up of the circuit as a
compressor. The IC is put in the feedback loop of the OPA
A1. The system gain expression is as follows:
V
OUT
VIN +
I1
2 @
R2 @ R1
R3 @ VIN(AVG)
1
2
(eq. 6)
(I1 = 140 mA)
RDC1, RDC2, and CDC form a DC feedback for A1. The
output DC level of A1 is given by:
V
OUT DC + VREF 1 )
R
DC1 ) RDC2
R4
* VB @
R
DC1 ) RDC2
R4
(eq. 7)
The zener diodes D1 and D2 are used for channel
overload protection.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA572DG | 功能描述:音頻放大器 Dual Channel Hi Perf Compandor Ind. Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA572DG | 制造商:ON Semiconductor 功能描述:Standard Recovery Rectifier |
| SA572DR2 | 功能描述:音頻放大器 Dual Channel Hi Perf RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA572DR2G | 功能描述:音頻放大器 Dual Channel Hi Perf Compandor Ind. Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA572DTB | 功能描述:音頻放大器 Dual Channel Hi Perf RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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