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参数资料
| 型号： | LM1894MX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC NOISE REDUCT SYS DYNAM 14SOIC |
| 标准包装： | 2,500 |
| 类型： | 动态噪音抑制 |
| 应用： | 车载系统，播放器，电视 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
| 配用： | LM1894MTBD-ND - BOARD EVALUATION LM1894 |
| 其它名称： | *LM1894MX *LM1894MX/NOPB LM1894MX |
SNAS551C – DECEMBER 1994 – REVISED APRIL 2013
Electrical Characteristics
Parameter
Conditions
Min
Typ
Max
Units
Operating Supply Range
4.5
8
18
V
Supply Current
VS = 8V
17
30
mA
MAIN SIGNAL PATH
Voltage Gain
DC Ground Pin 9(1)
0.9
1
1.1
V/V
DC Output Voltage
3.7
4.0
4.3
V
Channel Balance
DC Ground Pin 9
1.0
dB
Minimum Balance
AC Ground Pin 9 with 0.1
675
965
1400
Hz
μFCapacitor(1)
Maximum Bandwidth
DC Ground Pin 9(1)
27
34
46
kHz
Effective Noise Reduction
CCIR/ARM Weighted(2)
10
14
dB
Total Harmonic Distortion
DC Ground Pin 9
0.05
0.1
%
Input Headroom
Maximum VIN for 3% THD
1.0
Vrms
AC Ground Pin 9
Output Headroom
Maximum VOUT for 3% THD
VS 1.5
Vp-p
DC Ground Pin 9
Signal to Noise
BW = 20 Hz–20 kHz, re 300 mV
AC Ground Pin 9
79
dB
DC Ground Pin 9
77
dB
CCIR/ARM Weighted re 300 mV(3)
AC Ground Pin 9
82
88
dB
DC Ground Pin 9
70
76
dB
CCIR Peak, re 300 mV(4)
AC Ground Pin 9
77
dB
DC Ground Pin 9
64
dB
Input Impedance
Pin 2 and Pin 13
14
20
26
k
Ω
Channel Separation
DC Ground Pin 9
50
70
dB
Power Supply Rejection
C14 = 100
μF,
VRIPPLE = 500 mVrms,
40
56
dB
f = 1 kHz
Output DC Shift
Reference DVM to Pin 14 and
Measuree Output DC Shift from
4.0
20
mV
Minimum to Maximum Band-width(5)
(1)
To force the DNR system into maximum bandwidth, DC ground the input to the peak detector, pin 9. A negative temperature coefficient
of
0.5%/°C on the bandwidth, reduces the maximum bandwidth at increased ambient temperature or higher package dissipation. AC
ground pin 9 or pin 6 to select minimum bandwidth. To change minimum and maximum bandwidth, see Application Hints.
(2)
The maximum noise reduction CCIR/ARM weighted is about 14 dB. This is accomplished by changing the bandwidth from maximum to
minimum. In actual operation, minimum bandwidth is not selected, a nominal minimum bandwidth of about 2 kHz gives
10 dB of noise
reduction. See Application Hints.
(3)
The CCIR/ARM weighted noise is measured with a 40 dB gain amplifier between the DNR system and the CCIR weighting filter; it is
then input referred.
(4)
Measured using the Rhode-Schwartz psophometer.
(5)
Pin 10 is DC forced half way between the maximum bandwidth DC level and minimum bandwidth DC level. An AC 1 kHz signal is then
applied to pin 10. Its peak-to-peak amplitude is VDC (max BW) VDC (min BW).
Copyright 1994–2013, Texas Instruments Incorporated
3
Product Folder Links: LM1894
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