參數(shù)資料
型號: MAX924CSE+T
廠商: Maxim Integrated Products
文件頁數(shù): 4/17頁
文件大?。?/td> 0K
描述: IC COMPARATOR W/REF 16-SOIC
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 2,500
類型: 帶電壓基準(zhǔn)
元件數(shù): 4
輸出類型: CMOS,TTL
電壓 - 電源,單路/雙路(±): 2.5 V ~ 11 V,±1.25 V ~ 5.5 V
電壓 - 輸入偏移(最小值): 10mV @ 5V
電流 - 輸出(標(biāo)準(zhǔn)): 50mA
電流 - 靜態(tài)(最大值): 11µA
CMRR, PSRR(標(biāo)準(zhǔn)): 80dB CMRR,80dB PSRR
傳輸延遲(最大): 12µs
工作溫度: 0°C ~ 70°C
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
安裝類型: 表面貼裝
包裝: 帶卷 (TR)
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
12
______________________________________________________________________________________
2. Select R1. The leakage current into INB- is normally
under 1nA, so the current through R1 should
exceed 100nA for the thresholds to be accurate. R1
values up to about 10M
Ω can be used, but values in
the 100k
Ω to 1MΩ range are usually easier to deal
with. In this example, choose R1 = 294k
Ω.
3. Calculate R2 + R3. The overvoltage threshold
should be 5.5V when VIN is rising. The design
equation is as follows:
4. Calculate R2. The undervoltage threshold should
be 4.5V when VIN is falling. The design equation is
as follows:
5. Calculate R3.
Choose R3 = 1M
Ω (1% standard value)
6. Verify the resistor values. The equations are as
follows, evaluated for the above example.
Bar-Graph Level Gauge
The high output source capability of the MAX921 series
is useful for driving LEDs. An example of this is the
simple four-stage level detector shown in Figure 7.
The full-scale threshold (all LEDs on) is given by VIN =
(R1 + R2)/R1 volts. The other thresholds are at 3/4 full
scale, 1/2 full scale, and 1/4 full scale. The output
resistors limit the current into the LEDs.
Level Shifter
Figure 8 shows a circuit to shift from bipolar ±5V inputs
to TTL signals. The 10k
Ω resistors protect the
comparator inputs, and do not materially affect the
operation of the circuit.
Overvoltage threshold :
V
(V
V )
(R1
R2
R3)
R1
5.474V.
Undervoltage threshold :
V
(V
V )
(R1
R2
R3)
(R1 + R2)
4.484V,
where the hysteresis voltage V
V
R5
R4
OTH
REF
H
UTH
REF
H
REF
=+
×
++
=
×
++
=
.
R3
(R2 + R3)
R2
.068M
6
k
1.006M
=
11 9
.
Ω
R2
(R1 + R2 + R3)
(V
V )
V
R1
(294k + 1.068M)
(1.182
0.005)
4.5
294k
62.2k
Choose R2
61.9k
(1% standard value).
REF
H
UTH
=
Ω
R2
R3
R1
V
1
294k
5.5
(1.182
0.005)
1
1.068M
OTH
REF
H
+=
×
+
+
MAX923
INB-
REF
HYST
INA+
V-
V+
OUTA
OUTB
10k
R5
2.4M
R1
R2
R3
UNDERVOLTAGE
POWER GOOD
OVERVOLTAGE
VIN
VOTH = 5.5V
VUTH = 4.5V
R4
+5V
Figure 6. Window Detector
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