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參數(shù)資料
| 型號(hào)： | M491B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL |
| 中文描述： | 單片電壓合成調(diào)諧系統(tǒng)的1個(gè)模擬控制 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 135K |
| 代理商： | M491B |
PIN 3 : MEMORY TIMING OUTPUT
This output gives the timing for the pulses to be
appliedat Pin 2 duringthe modify and read cycles.
The output consists ofan opendrain transistor.
PIN 4 : FINE TUNING D/A(see Figure 5)
A D/A converter with 16-step resolution and a fre-
quencyof15kHzcanbeusedtogenerateavoltage
which,iffedtoavaricapdiodeinparalleltotheAFC
discriminator, willdetune the receiver bya small
f
while maintainingthe actionoftheDigitalAFT.This
output can be used in conjunction with both Linear
and Digital AFT modes of operations.
The Fine tuningfunction operates as follows:
- At the start of any automatic or manual search,
the output is set at the mid range.
- Whenthe search has been completedit is possi-
ble to operateon FT
±
commands.
The store command memorizes this information
Figure5
together with the 13 tuning voltage bits and 2
informationbits.
- Modification time of FT D/A is of 1 step every
200ms ifissuedlocallyorevery2receivedsignals
from Remote control transmitter.
PIN 5 : TUNING D/A(seeFigure 6)
A 2
13
= 8192 step pulse modulated signal for the
tuning voltageis available on this pin.
Pulse modulation is implemented by combination
of a ratemultiplier and pulse width principle.
With a tuning voltage increasing from zero, the
number of pulses increases continuously up to
2
8
= 256 ; starting from this point the number of
pulses remains the samebut the pulsesget larger
until they reach the maximum contentof the inter-
nal counter.The output consists of an open drain
transistorwhich offersa low impedance toground
when in the ON state.
V
OUT
9
7
FT
FT
64
μ
s
Mid
Range
FineTuning Output
4
M491B
6/16
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| M491B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL |
| M49-20.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 20.000MHz HC49S-SMD |
| M49-24.000-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.000MHz HC49S-SMD |
| M49-24.576-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.576MHz HC49S |
| M49-25.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 25.000MHz HC49S-SMD |
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