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參數資料
| 型號： | SA572DTBR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 運動控制電子 |
| 英文描述： | Programmable Analog Compandor |
| 中文描述： | DUAL COMPANDER, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, TSSOP-16 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SA572DTBR2 |
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:
V
OUT
V
IN
2
I
1
R
3
V
IN(AVG)
R
2
R
1
2
(eq. 4)
(I
1
= 140 A)
Both the resistors R
1
and R
2
are tied to internal summing
nodes. R
1
is a 6.8 k internal resistor. The maximum input
current into the gain cell can be as large as 140 A. This
corresponds to a voltage level of 140 A
6.8 k = 952 mV
peak. The input peak current into the rectifier is limited to
300 A by the internal bias system. Note that the value of
R
1
can be increased to accommodate higher input level. R
2
and R
3
are external resistors. It is easy to adjust the ratio of
R
3
/R
2
for desirable system voltage and current levels. A
small R
2
results in higher gain control current and smaller
static and dynamic tracking error. However, an impedance
buffer A
1
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 A
2
. R
3
and A
2
convert the gain cell output
current to the output voltage. In high-performance
applications, A
2
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 A
2
can be
biased at the low noise internal reference Pin 6 or 10.
Resistor R
4
is used to bias up the output DC level of A
2
for
maximum swing. The output DC level of A
2
is given by:
V
OUT
DC
V
REF
1
R
3
R
4
V
B
R
3
R
4
(eq. 5)
V
B
can be tied to a regulated power supply for a dual
supply system and be grounded for a single supply system.
C
A
sets the attack time constant and C
R
sets the recovery
time constant.
+
A1
(7,9)
(3,13)
(8)
(16)
(4,12)
(2,14)
(6,10)
(5,11)
BUFFER
A2
V
OUT
V
IN
C
IN1
C
IN2
C
IN3
2.2 F
V
REF
+VB
+V
CC
G
10 F
1 F
2.2 F
2.2 F
Figure 6. Basic Expandor Schematic
R
100k
R
2
3.3k
6.8k
17.3k
1k
R
4
R
3
R
1
R
6
C
1
C
C
A
2.2 F
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
A
1
. The system gain expression is as follows:
V
OUT
V
IN
I
1
2
R
2
R
1
R
3
V
IN(AVG)
1
2
(eq. 6)
(I
1
= 140 A)
R
DC1
, R
DC2
, and CDC form a DC feedback for A
1
. The
output DC level of A
1
is given by:
V
OUT
DC
V
REF
1
R
DC1
R
DC2
R
4
V
B
R
DC1
R
DC2
R
4
(eq. 7)
The zener diodes D
1
and D
2
are used for channel
overload protection.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SA572DTBR2G | 功能描述:音頻放大器 ANA COMPANDOR DUAL CHANEL RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA572F | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Programmable analog compandor |
| SA572N | 功能描述:音頻放大器 Dual Channel Hi Perf RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA572NG | 功能描述:音頻放大器 Dual Channel Hi Perf Compandor Ind. Temp RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| SA575 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage compandor |
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