MX641DW Просмотр технического описания (PDF) - MX-COM Inc
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MX641DW Datasheet PDF : 16 Pages
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Dual SPM Detector
6
3. External Components
MX641 PRELIMINARY INFORMATION
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
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
68k: ± 1%
R2
68k: ±1%
R3 Note 1 750k: ±1%
R4 Note 1 750k: ±1%
R5
68k: ± 1%
R6
68k: ± 1%
R7 Note 1 750k: ±1%
R8 Note 1 750k: ±1%
C1
1.0µF
±20%
C2
1.0µF
±20%
C3
270pF
±5%
C4
270pF
±5%
C5
270pF
±5%
C6
270pF
±5%
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 100k:.
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 2M:) between pins 1 & 2 and load capacitors
on pins 1 & 2 (nominally 10pF each, excluding package and board parasitics).
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480115.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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