參數(shù)資料
型號： LM1972
廠商： National Semiconductor Corporation
英文描述： Pot 2-Channel 78dB Audio Attenuator with Mute
中文描述： 鍋2通道78分貝音頻衰減器的靜音
文件頁數(shù)： 2/11頁
文件大?。?/td> 301K
代理商： LM1972
Absolute Maximum Ratings
(Notes 2, 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
DD
–V
SS
)
Voltage at Any Pin
Power Dissipation (Note 3)
ESD SusceptabiIity (Note 4)
Junction Temperature
15V
V
SS
0.2V to V
DD
+ 0.2V
150 mW
2000V
150C
Soldering Information
N Package (10 sec.)
Storage Temperature
+260C
65C to +150C
Operating Ratings
(Note 1) (Note 2)
T
MIN
T
A
T
MAX
Temperature Range
T
MIN
≤
T
A
≤
T
MAX
Supply Voltage (V
DD
V
SS
)
0C
≤
T
A
≤
+70C
4.5V to 12V
Electrical Characteristics
(Note 1) (Note 2)
The following specifications apply for all channels with V
= +6V, V
= 6V, V
= 5.5 Vpk, and f = 1 kHz, unless otherwise
specified. Limits apply for T
A
= 25C. Digital inputs are TTL and CMOS compatible.
Symbol
Parameter
Conditions
LM1972
Units
(Limits)
Typical
(Note 5)
2
0.0008
110
Limit
(Note 6)
4
0.003
100
I
S
THD+N
XTalk
Supply Current
Total Harmonic Distortion plus Noise
Crosstalk (Channel Separation)
Inputs are AC Grounded
V
IN
= 0.5 Vpk
@
0dB Attenuation
0dB Attenuation for V
IN
V
CH
measured
@
78dB
Inputs are AC Grounded
@
12dB Attenuation
A-Weighted
mA (max)
% (max)
dB (min)
SNR
Signal-to-Noise Ratio
120
110
dB (min)
A
M
Mute Attenuation
Attenuation Step Size Error
104
96
dB (min)
dB (max)
dB (max)
dB (min)
dB (min)
dB (min)
dB (min)
dB (min)
dB (max)
dB (max)
nA (max)
k
(min)
k
(max)
nA (max)
MHz (max)
V (min)
V (max)
V (max)
V (min)
0dB to 47.5dB
48dB to 78dB
Attenuation
@
0dB
Attenuation
@
20dB
Attenuation
@
40dB
Attenuation
@
60dB
Attenuation
@
78dB
Attenuation
@
0dB, 20dB, 40dB, 60dB
Attenuation
@
78dB
Inputs are AC Grounded
Pins 4, 20, V
IN
= 1.0 Vpk, f = 1 kHz
±
0.05
±
0.25
0.5
19.0
39.0
57.5
74.5
±
0.5
±
0.75
100
20
60
±
100
2
2.0
0.8
0.1
5.9
Absolute Attenuation Error
0.03
19.8
39.5
59.3
76.3
Channel-to-Channel Attenuation
Tracking Error
Analog Input Leakage Current
AC Input Impedance
I
LEAK
R
IN
10.0
40
I
IN
f
CLK
V
IH
V
IL
Input Current
Clock Frequency
High-Level Input Voltage
Low-Level Input Voltage
Data-Out Levels (Pin 12)
@
Pins 9, 10, 11
@
0V
<
V
IN
<
5V
1.0
3
@
Pins 9, 10, 11
@
Pins 9, 10, 11
V
DD
=6V, V
SS
=0V
Note 1:
All voltages are measured with respect to GND pins (1, 3, 5, 6, 14, 16, 19), unless otherwise specified.
Note 2:
Absolute Maximum Ratingsindicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func-
tional, but do not guarantee specific performance limits. Electrical Characteristicsstate DC andAC electrical specifications under particular test conditions which guar-
antee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is
given, however, the typical value is a good indication of device performance.
Note 3:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
,
θ
, and the ambient temperature T
A
. The maximum
allowable power dissipation is PD = (T
T
)/
θ
or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM1972, T
JMAX
= +150C,
and the typical junction-to-ambient thermal resistance, when board mounted, is 65C/W.
Note 4:
Human body model, 100 pF discharged through a 1.5 k
resistor.
Note 5:
Typicals are measured at 25C and represent the parametric norm.
Note 6:
Limits are guaranteed to National’s AOQL (Average Output Quality Level).
www.national.com
2
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