MX641 Ver la hoja de datos (PDF) - CML Microsystems Plc
Número de pieza
componentes Descripción
Lista de partido
MX641 Datasheet PDF : 17 Pages
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Dual SPM Detector
Page 6 of 16
3. External Components
VDD
XTAL/CLOCK
If you use a Clock Pulse input:
- Remove Xtal (X1)
- Connect Pin 1 to VDD
- Do not short Pins 3 & 4
- Input clock pulses to CLOCK IN
XTAL/CLOCK 1
X1
2
XTAL
OUT
3
24
23
22
See Figure 3
CLOCK
CLOCK IN
IN
OUTPUT ENABLE
4
5
21
20
CH2 OUTPUT
CH1 OUTPUT
6 MX641 19
7
18
VBIAS 8
17
CH1 AMP OUT 9
16
C3 CH1 AMP IN (-) R3
R1
10
15
C4
R2
11
14
CH1 AMP IN (+) VSS 12
13
R4
R8
C2
MX641 Preliminary Information
VDD
VDD
C1
SYSTEM SELECT
SERIAL DATA
SERIAL CLOCK
CHIP SELECT
PRESET LEVEL
OUTPUT SELECT
CH2 AMP OUT
R7 CH2 AMP IN (-) C5
R5
R6
CH2 AMP IN (+) C6
Figure 2: Recommended External Components
R1
68kΩ ± 1%
C1
1.0µF
±20%
R2
68kΩ ±1%
C2
R3 Note 1 750kΩ ±1%
C3
R4 Note 1 750kΩ ±1%
C4
R5
68kΩ ± 1%
C5
R6
68kΩ ± 1%
C6
R7 Note 1 750kΩ ±1%
1.0µF
270pF
270pF
270pF
270pF
±20%
±5%
±5%
±5%
±5%
R8 Note 1 750kΩ ±1%
X1 Note 2, 3 3.579545MHz
Table 2: Recommended External Components
Note:
1. Fixed Sensitivity Setting: when calculating/selecting gain components, R3, R4, R7 and R8 should
always be greater than or equal to 100kΩ.
2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To
obtain crystal oscillator design assistance, consult your crystal manufacturer.
3. The on-chip crystal circuitry includes a feedback resistor (nominally 2MΩ) between pins 1 & 2 and load
capacitors on pins 1 & 2 (nominally 10pF each, excluding package and board parasitics).
ã2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480115.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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