ATA5423_06 ATMEL [ATMEL Corporation], ATA5423_06 Datasheet - Page 26
![no-image](/images/no-image-200.jpg)
ATA5423_06
Manufacturer Part Number
ATA5423_06
Description
UHF ASK/FSK Transceiver
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATA5423_06.pdf
(100 pages)
- Current page: 26 of 100
- Download datasheet (2Mb)
26
ATA5423/25/28/29
C
enter the steep region of pulling versus load capacitance where there is a risk of an unstable
oscillation.
To ensure proper start-up behavior the small signal gain, and thus the negative resistance, pro-
vided by this XTO at start is very large; for example, oscillation starts up even in worst case with
a crystal series resistance of 1.5
approximately given by
with Z
Z
Z
Z
XTAL2 with typically 19 mS at 25°C.
With f
tance of about 2 kΩ. The worst case for technological, temperature and supply voltage variations
is then for C
Due to the large gain at startup, the XTO is able to meet a very low start-up time. The oscillation
start-up time can be estimated with the time constant τ .
After 10 τ to 20 τ an amplitude detector detects the oscillation amplitude and sets XTO_OK to
High if the amplitude is large enough. This sets N_RESET to High and activates the CLK output
if CLK_ON in control register 3 is High (see
VSOUT and DVCC voltage also have to be fulfilled (see
To save current in IDLE and Sleep modes, the load capacitors are partially switched off in these
modes with S1 and S2, as seen in
It is recommended to use a crystal with C
C
Lower values of C
higher values of C
Re Z
τ
1
3
3
0
0
=
{
consists of crystals C
= –j/(2 × π × f
of the XTAL has to be lower than C
= 1.0 pF to 2.2 pF.
= –j/(2 × π × f
-----------------------------------------------------------------------------------------------------------
4
XTOcore
XTO
1
×
, Z
π
2
2
= 13.5 MHz, gm = 19 mS, C
×
as complex impedances at pin XTAL1 and XTAL2, hence
}
0
=
f
2
m
≤2.2 pF always higher than 1.5 kΩ.
Re
×
C
XTO
⎧
⎨
⎩
XTO
m
m
m
Z
----------------------------------------------------------------------------------------------------- -
1
(up to 15 fF) can also be used, this has only little influence on pulling.
can be used, this increases the start-up time slightly. Lower values of C
×
× C
×
× C
2
(
Re Z
Z
Z
0
3
1
0
in parallel with an internal 110 kΩ resistor hence
L1
(
+
) /110 kΩ, gm is the internal transconductance between XTAL1 and
+
) + 5Ω and Z
Z
Z
XTOcore
2
2
×
+
Z
Z
3
3
)
Figure
kΩ
+
+
+
Z
Z
R
1
at C
1
L
m
Lmin
×
×
= 9 pF, and C
2
)
Z
Z
= –j/(2 × π × f
4-2.
0
/2 = 3.7 pF for a Pierce oscillator type in order to not
2
2
Table
≤
×
×
2.2 pF with this XTO. The negative resistance is
m
g
Z
m
= 3.0 fF to 7.0 fF, C
3
×
7-7). Note that the necessary conditions of the
g
m
0
⎫
⎬
⎭
= 2.2 pF, this results in a negative resis-
XTO
Figure 4-2
× C
L2
) + 5Ω.
and
LN
= 9 pF, R
Figure
5-1).
4841C–WIRE–05/06
m
< 120Ω and
0
or
Related parts for ATA5423_06
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATA5429](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
(ATA5423 - ATA5429) UHF ASK/FSK Transceiver
Manufacturer:
ATMEL Corporation
Datasheet:
![AT88SC0204CA-SH](/images/no-image3.png)
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
![AT88SC0808CA-SH](/images/no-image3.png)
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
![AT88SC1616C-SH](/images/no-image3.png)
Part Number:
Description:
Atmel CryptoMemory, 16Kbit
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
![AT25DF161-SH](/images/no-image3.png)
Part Number:
Description:
8-bit Atmel Microcontrollers
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
![ATMEGA1281V](/images/no-image3.png)
Part Number:
Description:
8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
![U4255BM-M](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B-P](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
![TDA4470](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet: