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| 型号： | SSM2167Z-EVAL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR SSM2167 |
| 标准包装： | 1 |
| 主要目的： | 音频，麦克风前置放大器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | SSM2167 |
| 主要属性： | 可变压缩，噪音选通，0.2% THD + N，可调式压缩比 |
| 次要属性： | 自动限制性能可防止 ADC 过载，3 V（2.5 ~ 5.5 V） |
| 已供物品： | 板 |
| 产品目录页面： | 775 (CN2011-ZH PDF) |
| 相关产品： | SSM2167-1RMZ-REELDKR-ND - IC PREAMP AUDIO MONO AB 10MSOP SSM2167-1RMZ-REELCT-ND - IC PREAMP AUDIO MONO AB 10MSOP SSM2167-1RMZ-REELTR-ND - IC PREAMP AUDIO MONO AB 10MSOP |
SSM2167
Data Sheet
Rev. G | Page 10 of 12
SETTING THE NOISE GATE THRESHOLD
(DOWNWARD EXPANSION)
The noise gate threshold is a programmable point using an external
resistor (RGATE) that is connected between Pin 7 (GATE THRS)
and VDD. The downward expansion threshold may be set between
40 dBV and 55 dBV, as shown in Table 5. The downward
expansion threshold is inversely proportional to the value of this
resistance: setting this resistance to 0 Ω sets the threshold at
approximately 10 mV rms (40 dBV), whereas a 5 kΩ resistance
sets the threshold at approximately 1 mV rms (55 dBV). This
relationship is illustrated in Figure 18. It is not recommended
to use more than 5 kΩ for the RGATE resistor because the noise
floor of the SSM2167 prevents the noise gate from being
lowered further without causing problems.
Table 5. Setting Noise Gate Threshold
Noise Gate (dBV)
Value of RGATE
40
0 Ω (short to V+)
48
1 kΩ
54
2 kΩ
55
5 kΩ
O
UT
P
UT
(
d
B)
INPUT (dB)
1
VRP
VDE1
VDE3
VDE2
r:1
VCA GAIN
0
26
28
-01
9
Figure 18. Effects of Varying the Downward
Expansion (Noise Gate) Threshold
ROTATION POINT (LIMITING)
Input signals above a particular level, the rotation point, are
attenuated (limited) by internal circuitry. This feature allows the
SSM2167 to limit the maximum output, preventing clipping of
the following stage, such as a codec or ADC. The rotation point
for the SSM2167 is set internally to 24 dBV (63 mV rms).
SHUTDOWN FEATURE
The supply current of the SSM2167 can be reduced to under
10 μA by applying an active low, 0 V CMOS-compatible input
to the SHUTDOWN pin (Pin 3) of the SSM2167. In this state,
the input and output circuitry of the SSM2167 assumes a high
impedance state; as such, the potentials at the input pin and the
output pin are determined by the external circuitry connected
to the SSM2167. The SSM2167 takes approximately 200 ms to
settle from a shutdown to power-on command. For power-on to
shutdown, the SSM2167 requires more time, typically less than
1 sec. Cycling the power supply to the SSM2167 can result in
quicker settling times: the off-to-on settling time of the SSM2167 is
less than 200 ms, whereas the on-to-off settling time is less than
1 ms. The SSM2167 shutdown current is related to both temper-
ature and voltage.
PCB LAYOUT CONSIDERATIONS
Because the SSM2167 is capable of wide bandwidth operation
and can be configured for as much as 60 dB of gain, special care
must be exercised in the layout of the PCB that contains the IC
and its associated components. The following applications hints
should be considered for the PCB.
The layout should minimize possible capacitive feedback from
the output of the SSM2167 back to its input. Do not run input
and output traces adjacent to each other.
A single-point (star) ground implementation is recommended
in addition to maintaining short lead lengths and PCB runs. In
applications where an analog ground and a digital ground are
available, the SSM2167 and its surrounding circuitry should be
connected to the analog ground of the system. As a result of
these recommendations, wire-wrap board connections and
grounding implementations are to be explicitly avoided.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SSM2167Z-EVAL | 制造商:Analog Devices 功能描述:SSM2167, MICROPHONE PREAMPLIFIER, EVALUA |
| SSM-21T-P1.4 | 制造商:JST Manufacturing 功能描述:N/R 1 N/R s Straight 17.6mm Crimp 300VDC / 300VAC 7A 105 -40 Tin 制造商:JST Manufacturing 功能描述:Phosphor Bronze Tin Plated Pin Contact |
| SSM22001MYB | 制造商:SHELLY ASSOCIATES 功能描述: |
| SSM2210 | 制造商:AD 制造商全称:Analog Devices 功能描述:Audio Dual Natched NPN transistor |
| SSM-2210 | 制造商:AD 制造商全称:Analog Devices 功能描述:Audio Dual Natched NPN transistor |
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