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| 型号： | SSM-2120 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Dynamic Range Processors/Dual VCA |
| 中文描述： | 动态范围处理器/双壳抗原 |
| 文件页数： | 3/12页 |
| 文件大小： | 371K |
| 代理商： | SSM-2120 |
SSM2120/SSM2122
REV. C
–3–
2V
FULL
WAVE
RECTIFIER
|I
IN
|
V+
THRESH 2
LOG AV 2
V–
CON
OUT 2
REC
IN 2
+V
C1
CFT 1
–V
C1
INPUT 1
OUTPUT 1
+V
C2
CFT 2
–V
C2
INPUT 2
OUTPUT 2
SSM2122
2V
FULL
WAVE
RECTIFIER
|I
IN
|
V+
THRESH 1
LOG AV 1
V–
CON
OUT 1
REC
IN 1
Figure 1. SSM2120 Block Diagram
VCA PERFORMANCE
Figures 2a and 2b show the typical THD and noise performance
of the VCAs over
±
20 dB gain/attenuation. Full Class A operation
provides very low THD.
GAIN – dB
0.03
T
0.01
–20
20
–10
0
10
0.003
a. VCA THD Performance vs. Gain
(+10 dBV In/Out @ 1 kHz)
GAIN – dB
–70
–80
–20
20
–10
0
10
–90
N
b. VCA Noise vs. Gain (20 kHz Bandwidth)
Figure 2. Typical THD and Noise Performance
VOLTAGE-CONTROLLED AMPLIFIERS
The two voltage-controlled amplifiers are full Class A current
in/current out devices with complementary dB/V gain control
ports. The control sensitivities are +6 mV/dB and –6 mV/dB. A
resistor divider (attenuator) is used to adapt the sensitivity of an
external control voltage to the range of the control port. It is
best to use 200
or less for the attenuator resistor to ground.
VCA INPUTS
The signal inputs behave as virtual grounds. The input current
compliance range is determined by the current into the reference
current pin.
REFERENCE PIN
The reference current determines the input and output current
compliance range of the VCAs. The current into the reference
pin is set by connecting a resistor to V+. The voltage at the
reference pin is about two volts above V– and the current will be
I
REF
=
[(
V
+
)–((
V
–)
+
2
V
)]
R
REF
The current consumption of the VCAs will be directly pro-
portional to I
REF
which is nominally 200
μ
A. The device will
operate at lower current levels which will reduce the effective
dynamic range of the VCAs. With a 200
μ
A reference current,
the input and output clip points will be
±
400
μ
A. In general:
I
CLIP
=
±
2
I
REF
VCA OUTPUTS
The VCA outputs are designed to interface directly with the virtual
ground inputs of external operational amplifiers configured as
current-to-voltage converters. The outputs must operate at virtual
ground because of the output stage’s finite output impedance.
The power supplies and selected compliance range determines
the values of input and output resistors needed. As an example,
with
±
15 V supplies and
±
400
μ
A maximum input and output
current, choose R
IN
= R
OUT
= 36 k
for an output compliance
range of
±
14.4 V. Note that the signal path through the VCA
including the output current-to-voltage converter is noninverting.
相关PDF资料 |
PDF描述 |
|---|---|
| SSM-2122 | Dynamic Range Processors/Dual VCA |
| SSM2120 | Dynamic Range Processors/Dual VCA |
| SSM2122 | Dynamic Range Processors/Dual VCA |
| SSM-2134 | LOW NOISE AUDIO OPERATIONAL AMPLIFIER |
| SSM2134 | LOW NOISE AUDIO OPERATIONAL AMPLIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SSM2120P | 制造商:Analog Devices 功能描述:DUAL VOLT ATTENUATOR 2120 DIP22 |
| SSM2122 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM-2122 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM2122P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Amplifier. Other |
| SSM2125 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dolby Pro-Logic Surround Matrix Decoder |
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