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參數(shù)資料
| 型號(hào)： | PCA5010H |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Pager baseband controller |
| 中文描述： | 傳呼機(jī)基帶控制器 |
| 文件頁(yè)數(shù)： | 30/112頁(yè) |
| 文件大?。?/td> | 627K |
| 代理商： | PCA5010H |
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1998 Nov 02
30
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
6.10
76.8 kHz oscillator
6.10.1
F
UNCTION
The oscillator produces a reference frequency of 76.8 kHz.
The frequency offset is compensated by a separate digital
clock correction block. The oscillator operates directly on
V
BAT
and is always enabled.
6.10.2
O
SCILLATOR CIRCUITRY
The on-chip inverting oscillator amplifier is a single NMOS
transistor supplied with a constant current. The amplitude
visible at terminals XTL1 and XTL2 is therefore not a full
rail swing with a very high impedance. To reduce the
power consumption, the input Schmitt trigger buffer is
limited to approximately 100 kHz maximum frequency.
The whole circuit operates directly at the battery supply.
The 76.8 kHz oscillator cannot be disabled. It also
continues its operation during DC/DC converter off or
80C51 stop mode.
The simplest application configuration is shown in Fig.14a.
C1 and C2 can be added to operate a crystal at its optimal
load condition. The resulting capacitance of the series
connection of C1 and C2 must be smaller than 5 pF for a
guaranteed start-up of the oscillator.
Fig.14 Oscillator circuit.
handbook, full pagewidth
MGR115
2 M
76.8 kHz
10 pF
(a)
(b)
(c)
10 pF
76.8 kHz
76.8 kHz
76.8 kHz
XTL1
XTL2
76.8 kHz
10 pF
10 pF
XTL1
XTL2
2 M
C1
VP = VBAT
fmax = 100 kHz
C2
10 pF
10 pF
XTL1
XTL2
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