MAX9107 查看數據表（PDF） - Maxim Integrated
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MAX9107 Datasheet PDF : 9 Pages
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MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
VTRIP+
VHYST
VTRIP-
VIN+
VOS =
VTRIP+ + VTRIP-
2
VIN- = 0
VOH
COMPARATOR
OUTPUT
VOL
Figure 1. Input and Output Waveforms, Noninverting Input
Varied
Applications Information
Circuit Layout
Because of the MAX9107/MAX9108/MAX9109’s high
gain bandwidth, special precautions must be taken to
realize the full high-speed capability. A printed circuit
board with a good, low-inductance ground plane is
mandatory. Place the decoupling capacitor (a 0.1µF
ceramic capacitor is a good choice) as close to VCC as
possible. Pay close attention to the decoupling capacitor’s
bandwidth, keeping leads short. Short lead lengths on the
inputs and outputs are also essential to avoid unwanted
parasitic feedback around the comparators. Solder the
device directly to the printed circuit board instead of using
a socket.
Overdriving the Inputs
The inputs to the MAX9107/MAX9108/MAX9109 may be
driven beyond the voltage limits given in the Absolute
Maximum Ratings, as long as the current flowing into
the device is limited to 25mA. However, if the inputs are
overdriven, the output may be inverted. The addition of an
external diode prevents this inversion by limiting the input
voltage to 200mV to 300mV below ground (see Figure 3).
Battery-Operated Infrared Data Link
In Figure 4, the circuit allows reception of infrared data.
The MAX4400 converts the photodiode current to a
voltage, and the MAX9109 determines whether the
amplifier output is high enough to be called a “1.”
The current consumption of this circuit is minimal: the
MAX4400 and MAX9109 require typically 410µA and
350µA, respectively.
3V
LATCH
LE 1.4V
0 COMPARE
ts
th
VOS
DIFFERENTIAL
INPUT
VOLTAGE
VOH
OUTPUT 1.4V
VOL
VOD
VIN
tPD+
Figure 2. MAX9109 Timing Diagram
VCLAMP = -200mV TO -300mV
1/2 MAX9107
ISRC
V-
Figure 3. Schottky Clamp for Input Driven Below Ground
10pF
1MΩ
+5V
MAX4400
3
SIEMENS BP-104
PHOTODIODE 1
0.1µF
5
4
2
100kΩ
1000pF
47kΩ 100kΩ
+5V
1000pF
+5V
3
6
0.1µF
1
4
2
5 DATA
MAX9109
Figure 4. Battery-Operated Infrared Data Link Consumes Only
760μA
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