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參數(shù)資料
| 型號： | M41T00AUDD1E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | REAL TIME CLOCK, DSO16 |
| 封裝： | 5 X 4 MM, ROHS COMPLIANT, DFN-16 |
| 文件頁數(shù)： | 24/42頁 |
| 文件大?。?/td> | 333K |
| 代理商： | M41T00AUDD1E |
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Audio section operation
M41T00AUD
7.1
Gain
The programmable gain stage follows the band pass filter. It provides between –33 and
+12 dB of gain, in 3 dB steps (+/-1 dB per step). The gain is selected by the GAIN bits, D3-
D0 of register 08h, as listed in Table 4. A MUTE bit, D4 of the same register, allows the
audio to be cut off altogether.
At the first power-up, GAIN will be initialized to its lowest value, 0, corresponding to a gain of
–33 dB. Furthermore, MUTE will be set thus cutting off all audio.
On subsequent power-ups, GAIN is unaffected, but the MUTE bit is always set to turn off the
audio at power-up.
The final section is the output driver. It has a differential output capable of driving 300mW
into an 8
Ω load.
The overall gain of the M41T00AUD is defined as the ratio of the AC output voltage, AOUT,
blocks any DC in the input signal.
Equation 1
Overall gain = AOUT / SIN
AOUT is measured between the output pins AOUT
+ and AOUT–.
AOUT = AOUT
+
- AOUT–
Each of the output levels is determined by the ratio of the feedback and input resistors along
with the GAIN value.
AOUT+ = SIN x AV x R2/R1
AOUT– =
-S
IN x AV x R2/R1
yields:
AOUT = SIN x AV x R2/R1 - (-SIN x AV x R2/R1) = 2 SIN x AV x R2/R1
With R1 = 2*R2, this reduces to AOUT = SIN x AV. Thus, when R1 = 2*R2, the gain levels in
Table 7 reflect overall gain of the circuit (at mid-band frequencies, about 1kHz with the
indicated 0.1 uF capacitor). For GAIN set to B (0 dB, AV = 1), the output voltage will be
equal to the input (
±1 dB).
7.1.1
Gain tolerance
Two tolerance parameters apply to the gain levels. As shown in Table 7, upper and lower
limits are listed for four of the GAIN values (4, 5, Bh and Eh). For GAIN=Bh, the tolerance is
±1 dB. This means the end-to-end gain of the part, with R1 = 2*R2, will be 0±1 dB. For
GAIN = 4, 5 and Eh, the tolerance is ±2 dB. At each of these three settings, as shown in
table 7, the gain will be within 2 dB of the listed typical value. For GAIN =E, the end-to-end
gain will be between +7 and +11 dB (9±2 dB).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T00AUDD1F | 功能描述:實(shí)時時鐘 SERIAL RTC W/AUDIO RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T00CAP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock (RTC) with integral backup battery and crystal |
| M41T00CAPPC1 | 制造商:STMicroelectronics 功能描述:REAL TIME CLOCK SERL 8BYTE 16DFN - Bulk 制造商:STMicroelectronics 功能描述:IC RTC SERIAL W/AUDIO 24PDIP |
| M41T00M | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access TIMEKEEPER |
| M41T00M6 | 功能描述:實(shí)時時鐘 Serial 64 (8X8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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