欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: MC34119DTB
廠商: MOTOROLA INC
元件分類: 音頻/視頻放大
英文描述: LOW POWER AUDIO AMPLIFIER
中文描述: 0.4 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝: PLASTIC, TSSOP-8
文件頁數: 4/12頁
文件大小: 264K
代理商: MC34119DTB
MC34119
4
MOTOROLA ANALOG IC DEVICE DATA
DESIGN GUIDELINES
General
The MC34119 is a low power audio amplifier capable of
low voltage operation (VCC = 2.0 V minimum) such as that
encountered in line–powered speakerphones. The circuit
provides a differential output (VO1–VO2) to the speaker to
maximize the available voltage swing at low voltages. The
differential gain is set by two external resistors. Pins FC1 and
FC2 allow controlling the amount of power supply and noise
rejection, as well as providing alternate inputs to the
amplifiers. The CD pin permits powering down the IC for
muting purposes and to conserve power.
Amplifiers
Referring to the block diagram, the internal configuration
consists of two identical operational amplifiers. Amplifier #1
has an open loop gain of
80 dB (at f
100 Hz), and the
closed loop gain is set by external resistor Rf and Ri. The
amplifier is unity gain stable, and has a unity gain frequency
of approximately 1.5 MHz. In order to adequately cover the
telephone voice band (300 Hz to 3400 Hz), a maximum
closed loop gain of 46 is recommended. Amplifier #2 is
internally set to a gain of – 1.0 (0 dB).
The outputs of both amplifiers are capable of sourcing and
sinking a peak current of 200 mA. The outputs can typically
swing to within
0.4 V above ground, and to within
1.3 V
below VCC, at the maximum current. See Figures 18 and 19
for VOH and VOL curves.
The output dc offset voltage (VO1–VO2) is primarily a
function of the feedback resistor (Rf), and secondarily due to
the amplifiers’ input offset voltages. The input offset voltage
of the two amplifiers will generally be similar for a particular
IC, and therefore nearly cancel each other at the outputs.
Amplifier #1’s bias current, however, flows out of Vin (Pin 4)
and through Rf, forcing VO1 to shift negative by an amount
equal to [Rf
×
IIB]. VO2 is shifted positive an equal amount.
The output offset voltage, specified in the Electrical
Characteristics, is measured with the feedback resistor
shown in the Typical Application Circuit, and therefore takes
into account the bias current as well as internal offset
voltages of the amplifiers. The bias current is constant with
respect to VCC.
FC1 and FC2
Power supply rejection is provided by the capacitors (C1
and C2 in the Typical Application Circuit) at FC1 and FC2. C2
is somewhat dominant at low frequencies, while C1 is
dominant at high frequencies, as shown in the graphs of
Figures 4 to 7. The required values of C1 and C2 depend on
the conditions of each application. A line powered
speakerphone, for example, will require more filtering than a
circuit powered by a well regulated power supply. The
amount of rejection is a function of the capacitors, and the
equivalent impedance looking into FC1 and FC2 (listed in the
Electrical Characteristics as RFC1 and RFC2).
In addition to providing filtering, C1 and C2 also affect the
turn–on time of the circuit at power–up, since the two
capacitors must charge up through the internal 50 k and
125 k
resistors. The graph of Figure 1 indicates the
turn–on time upon application of VCC of +6.0 V. The turn–on
time is
60% longer for VCC = 3.0 V, and
20% less for
VCC = 9.0 V. Turn–off time is <10
μ
s upon removal of VCC.
t
C2, CAPACITANCE (
μ
F)
Figure 1. Turn–On Time versus C1, C2 at Power–On
360
300
240
180
120
60
0
0
2.0
4.0
6.0
8.0
10
C1 = 5.0
μ
F
C1 = 1.0
μ
F
VCC switching from
0 V to 6.0 V
Chip Disable
The Chip Disable (Pin 1) can be used to power down the
IC to conserve power, or for muting, or both. When at a Logic
“0” (0 V to 0.8 V), the MC34119 is enabled for normal
operation. When Pin 1 is at a Logic “1” (2.0 V to VCC V), the
IC is disabled. If Pin 1 is open, that is equivalent to a Logic
“0,” although good design practice dictates that an input
should never be left open. Input impedance at Pin 1 is a
nominal 90 k
. The power supply current (when disabled) is
shown in Figure 15.
Muting, defined as the change in differential gain from
normal operation to muted operation, is in excess of 70 dB.
The turn–off time of the audio output, from the application of
the CD signal, is <2.0
μ
s, and turn on–time is 12 ms–15 ms.
Both times are independent of C1, C2, and VCC.
When the MC34119 is disabled, the voltages at FC1 and
FC2 do not change as they are powered from VCC. The
outputs, VO1 and VO2, change to a high impedance condition,
removing the signal from the speaker. If signals from other
sources are to be applied to the outputs (while disabled), they
must be within the range of VCC and Ground.
Power Dissipation
Figures 8 to 10 indicate the device dissipation (within the
IC) for various combinations of VCC, RL, and load power. The
maximum power which can safely be dissipated within the
MC34119 is found from the following equation:
PD = (140
°
C – TA)/
θ
JA
where TA is the ambient temperature; and
θ
JA is the package
thermal resistance (100
°
C/W for the standard DIP package,
and 180
°
C/W for the surface mount package.)
The power dissipated within the MC34119, in a given
application, is found from the following equation:
PD = (VCC x ICC) + (IRMS x VCC) – (RL x IRMS2)
where ICC is obtained from Figure 15; and IRMS is the RMS
current at the load; and RL is the load resistance.
Figures 8 to 10, along with Figures 11 to 13 (distortion
curves), and a peak working load current of
±
200 mA, define
the operating range for the MC34119. The operating range is
further defined in terms of allowable load power in Figure 14
for loads of 8.0
, 16
and 32
. The left (ascending) portion
相關PDF資料
PDF描述
MC34119 ECONOLINE: RSZ/P - 1kVDC
MC34119D LOW POWER AUDIO AMPLIFIER
MC34129 HIGH PERFORMANCE CURRENT MODE CONTROLLERS
MC33129D HIGH PERFORMANCE CURRENT MODE CONTROLLERS
MC33129P HIGH PERFORMANCE CURRENT MODE CONTROLLERS
相關代理商/技術參數
參數描述
MC34119DTBR2 功能描述:IC AMP AUDIO 4W MONO AB 8TSSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機,2-通道(立體聲) 在某負載時最大輸出功率 x 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C,麥克風,靜音,短路保護,音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP(2.09x2.09) 封裝/外殼:25-WFBGA,WLCSP 包裝:帶卷 (TR)
MC34119EC 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述:
MC34119EF 制造商:Freescale Semiconductor 功能描述:LOW POWER AUDIO AMPLIFIER
MC34119G-D08-T 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW POWER AUDIO AMPLIFIER
MC34119G-P08-R 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW POWER AUDIO AMPLIFIER
主站蜘蛛池模板: 喀喇| 扎囊县| 秦皇岛市| 绥宁县| 湖州市| 南木林县| 册亨县| 隆德县| 巴塘县| 乐清市| 无棣县| 道孚县| 遵义县| 灵川县| 遂宁市| 自治县| 昭觉县| 黄石市| 兰考县| 北辰区| 元阳县| 姜堰市| 日土县| 张家港市| 周口市| 清涧县| 和龙市| 砚山县| 平谷区| 南开区| 历史| 清涧县| 丽江市| 香格里拉县| 建昌县| 盘山县| 塔河县| 承德市| 雷山县| 乐业县| 建阳市|