SWCS045B
– SEPTEMBER 2010 – REVISED JUNE 2011
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Shunt capacitor
1.4
2.6
pF
Quality factor
8000
80000
CRYSTAL OSCILLATOR EXTERNAL COMPONENTS
VRTC power supply external filtering
OSC32KCAP
0.6
1.0
2.7
F
cap
Frequency
32.768
kHz
Load capacitors on OSC32KIN and
Duty cycle
40
50
60
%
OSC32KOUT (parallel mode,
including parasitic of PCB for
Rise and fall time (10
–90%)
10
20
ns
external cap)
Setup time
1
ms
@ 25
°C, normal and
Frequency accuracy (considering
–30
0
30
high-performance (HP) modes
crystal tolerance and internal load
ppm
capacitors variation)
@ 25
°C, backup mode
–80
0
80
Oscillator capacitor ratio:
1
COSC32KIN/COSC32KOUT
Oscillator contribution in normal and
Frequency temperature coefficient
HP modes (not including the crystal
±0.5
ppm/
°C
variations)
SSB phase noise at a 1-kHz offset
HP mode OSC_HPMODE = 1
–125
dBc/Hz
from the carrier
SSB phase noise at a 100-Hz offset
HP mode OSC_HPMODE = 1
–105
dBc/Hz
from the carrier
Cycle jitter short term (peak-peak)
Normal mode OSC_HPMODE = 0
25
ns
Period-to-period jitter, long-term
Normal mode OSC_HPMODE = 0
120
ns
100k pulses (peak-peak)
20 Hz
– 20 kHz flat
0.86
Integrated jitter (HP mode)
nsRMS
80 Hz
– 20 kHz flat
0.43
Gm boosted during start-up phase
Startup time on power on
300
ms
Shunt capacitor
≤ 1.4 pF
Oscillator ratio between negative
Sixth harmonic mode rejection
resistance @ 32 kHz and negative
10
RS32/RS200
resistance @ 200 kHz (sixth
harmonic)
Crystal mounted:
– Backup mode (@ 25°C)
1.5
– Normal mode: OSC_HPMODE = 0
3
Ground current
A
– HP mode: OSC_HPMODE = 1
5
– Start-up (boost) phase
20
Bypass mode: OSC_BYPASS = 1
3
Duty cycle CLK32KAO/CLK32KG
Logic output signal
40
50
60
%
Rise and fall time (10
–20%)
CLK32KAO/CLK32KG
5
20
100
ns
32-kHz RC OSCILLATOR
Output frequency
32
kHz
Output frequency accuracy
After trimming
–15
0
+15
%
Cycle jitter (RMS)
10
%
Output duty cycle
40
50
60
%
Settling time
150
s
Active current consumption
4
8
A
Power-down current
30
nA
6-MHz RC OSCILLATOR
Output frequency
6
MHz
Output frequency accuracy
After trimming
–10
0
+10
%
Cycle jitter (RMS)
5
%
Copyright
2010–2011, Texas Instruments Incorporated
21