ATA5757 ATMEL Corporation, ATA5757 Datasheet - Page 16

• Manufacturer Part Number: ATA5757
• Description: (ATA5756 / ATA5757) UHF ASK/FSK TRANSMITTER
• Manufacturer: ATMEL Corporation

Electrical Characteristics (Continued)
V
Typical values are given at V
C
16
Parameters
Imaginary part of XTO1
Impedance in steady state
oscillation
Real part of XTO1 impedance in
small signal oscillation
Crystal oscillator start-up time
XTO drive current
Locking time of the PLL
PLL loop bandwidth
In loop phase noise PLL
Phase noise VCO
Frequency range of VCO
Clock output frequency (CMOS
microcontroller compatible)
Clock output minimum High and
Low time
Series resonance resistance of
the resonator seen from pin
XTO1
Capacitive load at Pin XTO1
FSK modulation frequency rate
FSK switch OFF resistance
FSK switch OFF capacitance
FSK switch ON resistance
ASK modulation frequency rate
M
S
= 2.0 V to 3.6 V, T
=
4.37
fF,
ATA5756/ATA5757
C
0
=
1.3
pF,
amb
C
= -40°C to 125°C unless otherwise specified.
LNOM
S
= 3.0 V and T
=
18
Test Conditions
Since pulling P is
P = -IM
∆f
with C
This value is important for crystal
oscillator start-up
Time between ENABLE of the IC with
FSK = H and activation of the CLK
output. The CLK is activated
synchronously to the output frequency
if the current through the XTAL has
reached 35% to 80% of its maximum
amplitude. Crystal parameters:
C
C
C
Current flowing through the crystal in
steady state oscillation (peak-to-peak
value)
Time between the activation of CLK
and when the PLL is locked
(transmitter ready for data
transmission)
25 kHz distance to carrier
at 1 MHz
at 36 MHz
ATA5756
ATA5757
ATA5756
ATA5757
C
Low = 0.2 × V
For proper detection of the XTO
amplitude
This corresponds to 20 kBaud in
Manchester coding and 40 kBaud in
NRZ coding
High Z
High Z capacitance
Low Z
Duty cycle of the modulation signal =
50%, this corresponds to 20 kBaud in
Manchester coding and 40 kBaud in
NRZ coding
pF,
M
LNOM
5
Load
XTO
=
=
C
15
4.37
≤ 20 pF, High = 0.8 × Vs,
can be calculated out of IM
M
=
4
XTO
= 4.37 fF
=
pF,
18
10
amb
fF,
× C
pF,
R
pF,
C
S
S
= 25°C. All parameters are referred to GND (Pin 9).
M
, f
0
≤
C
60
× π × f
=
CLK
C
4
5
1.3
=
Ω
=
< 1.7 MHz
10
15
pF,
XTO
pF,
pF and
XTO
R
S
≤
60
Ω
R
C
R
f
Symbol
f
f
MOD_FSK
MOD_ASK
Loop_PLL
RE
T
R
C
SWIT_OFF
SWIT_OFF
IM
∆T
∆Τ
L
SWIT_ON
I
L
L
f
DXTO
f
CLKLH
at36M
s_max
L_max
VCO
CLK
at1M
PLL
XTO
XTO
XTO
PLL
Min.
-650
0.75
310
432
125
j20
50
0
0
f
f
-1100
0
0
Typ.
-121
j110
300
250
130
-85
-90
0.6
/192
/256
0.9
Max.
-115
j200
250
317
448
150
175
-76
-84
1.4
1.1
20
20
5
4702H–RKE–09/04
dBc/Hz
dBc/Hz
dBc/Hz
µApp
MHz
MHz
MHz
Unit
kHz
kHz
kHz
ms
µs
ns
pF
kΩ
pF
Ω
Ω
Ω
Ω