Rainbow Electronics ATA5746 - 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
----------- =