Electrical characteristics: general (continued) – Rainbow Electronics ATA5746 User Manual
Page 34

34
4596A–RKE–05/06
ATA5745/ATA5746 [Preliminary]
4
XTO
4.1
Transconductance XTO at
start
At startup; after startup
the amplitude is regulated
to V
PPXTAL
7,8
g
m, XTO
20
mS
B
4.2
XTO start-up time
C
0
≤ 2.2 pF
C
m
< 14 fF
R
m
≤ 120Ω
7,8
T
XTO_Startup
300
800
µs
A
4.3
Maximum C
0
of XTAL
7,8
C
0max
3.8
pF
D
4.4
Pulling of LO frequency
f
LO
due to XTO, C
L1
and
C
L2
versus temperature
and supply changes
1.0 pF
≤ C
0
≤ 2.2 pF
C
m
= 4.0 fF to 7.0 fF
R
m
≤ 120Ω
3
∆f
XTO
–5
+5
ppm
C
4.5
Amplitude XTAL after
startup
C
m
= 5 fF, C
0
= 1.8 pF
R
m
= 15Ω
V(XTAL1, XTAL2)
peak-to-peak value
7,8
V
PPXTAL
700
mVpp
C
V(XTAL1)
peak-to-peak value
7,8
V
PPXTAL
350
mVpp
C
4.6
Maximum series
resistance R
m
of XTAL at
startup
C
0
≤ 2.2 pF, small signal
start impedance, this
value is important for
crystal oscillator startup
7,8
Z
XTAL12_START
–1400
–2000
Ω
B
4.7
Maximum series
resistance R
m
of XTAL
after startup
C
0
≤ 2.2 pF
C
m
< 14 fF
7,8
R
m_max
15
120
Ω
B
4.8
Nominal XTAL load
resonant frequency
f
RF
= 433.92 MHz
f
RF
= 315 MHz
7,8
f
XTAL
13.57375
13.1433
MHz
D
4.9
External CLK_OUT
frequency
CLK_OUT_CRTL1 = 0
CLK_OUT_CTRL0 = 0
--> CLK_OUT disabled
3
f
CLK_OUT
f
CLK
disabled (low level on pin
CLK_OUT)
MHz
A
CLK_OUT_CRTL1 = 0
CLK_OUT_CTRL0 = 1
--> division ratio = 3
CLK_OUT_CRTL1 = 1
CLK_OUT_CTRL0 = 0
--> division ratio = 6
CLK_OUT_CRTL1 = 1
CLK_OUT_CTRL0 = 1
--> division ratio = 12
13. Electrical Characteristics: General (Continued)
All parameters refer to GND and are valid for T
amb
= –40°C to +105°C, V
VS3V_AVCC
= V
VS5V
= 2.7V to 3.3V, and V
VS5V
= 4.5V to 5.5V.
Typical values are given at V
VS3V_AVCC
= V
VS5V
= 3V, T
amb
= 25°C, and f
RF
= 315 MHz unless otherwise specified. Details about current
consumption, timing, and digital pin properties can be found in the specific sections of the “Electrical Characteristics”.
No. Parameters
Test Conditions
Pin
(1)
Symbol
Min.
Typ.
Max.
Unit
Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Pin numbers in parenthesis were measured with RF_IN matched to 50
Ω according to
Figure 2-1 on page 6
with component
values as in
Table 2-2 on page 6
(RF
IN
).
f
CLK
f
XTO
3
-----------
=
f
CLK
f
XTO
6
-----------
=
f
CLK
f
XTO
12
-----------
=