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參數(shù)資料
| 型號： | FX019P |
| 英文描述： | Digitally Controlled Gain Amplifier |
| 中文描述： | 數(shù)控增益放大器 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 58K |
| 代理商： | FX019P |
3
Fig.3 SINAD vs Input Level – Typical Values
Application Notes
INPUT LEVEL dB
SINAD (dB)
30
40
50
60
-40
-30
-20
-10
0
10.0
25.0
75.0
250.0
775.0
1000.0
1730.0
-17
110.0
mVrms
7.0
Input Frequency = 1.0kHz
Input Level 0dB ref = 775mVrms
Ch1 2, 3 or 4 Gain Set to 0dB
V
DD
V
DD
V
SS
C
6
C
1
C
2
C
3
C
4
C
5
V
SS
V
BIAS
V
SS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FX019
SERIAL CLOCK INPUT
CONTROL DATA INPUT
CHIP SELECT
CHANNEL 1 OUTPUT
CHANNEL 2 OUTPUT
CHANNEL 3 OUTPUT
CHANNEL 4 OUTPUT
CHANNEL 1 INPUT
CHANNEL 2 INPUT
CHANNEL 3 INPUT
CHANNEL 4 INPUT
LOAD/LATCH
LOAD/LATCH
Application Recommendations
(f)
tracks.
(g)
eliminating external pick-up on the channel input and
output pins.
(h)
Do not run high-level output tracks close to low-
level input tracks.
(i) Input signal amplitudes should be applied with due
regard to Figure 3.
Analogue tracks should not run parallel to digital
A "Ground Plane" connected to V
will assist in
(a)
cause instability and/or variance of selected gains.
(b)
Care should be taken on the design and layout of
the printed circuit board.
(c)
All external components (Figure 2) should be
kept close to the FX019 package.
(d)
Inputs and outputs should be screened wherever
possible.
(e)
Tracks should be kept short.
A noisy or badly regulated power supply can
To avoid excess noise and instability in the final installation it is recommended that the following points be noted.
Notes
(1) Channel Amplifiers 1 to 4 are inverting amplifiers.
(2) Analogue input capacitors C
to C
are only required for a.c.
input signals, d.c. input signals do not require these components.
Component
C
1
to C
4
C
5
C
6
Tolerances: C = ± 20%
Value
0.1μF
1.0μF
1.0μF
Fig.2 External Component Connections
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