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參數資料
| 型號： | MAX9028EBT+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 3/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPARATOR BTR 6-UCSP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 系列： | Beyond-the-Rails™ |
| 類型： | 通用 |
| 元件數： | 1 |
| 輸出類型： | 開路漏極，滿擺幅 |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V |
| 電壓 - 輸入偏移（最小值）： | 5mV @ 5V |
| 電流 - 輸入偏壓（最小值）： | 0.001µA @ 5V |
| 電流 - 輸出（標準）： | 50mA |
| 電流 - 靜態(tài)（最大值）： | 1.25µA |
| CMRR, PSRR（標準）： | 50.45dB CMRR，60dB PSRR |
| 傳輸延遲（最大）： | 45µs |
| 磁滯： | 4mV |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 6-WFBGA，CSPBGA |
| 安裝類型： | 表面貼裝 |
| 包裝： | 帶卷 (TR) |
MAX9025–MAX9028
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
______________________________________________________________________________________
11
THRESHOLDS
OUT
IN+
IN-
VHB
HYSTERESIS
BAND
VTHF
VTHR
Figure 2. Threshold Hysteresis Band
VCC
MAX9027
OUT
RS
RFB
VCC/2
VIN
Figure 3. MAX9025/MAX9027 External Hysteresis
Simplest Circuit
The simplest circuit for adding external hysteresis is
shown in Figure 3. In this example, the hysteresis is
defined by:
where RS is the source resistance and RFB is the feed-
back resistance. Because the comparison threshold is
1/2 VCC, the MAX9027 was chosen for its push-pull out-
put and lack of reference. This provides symmetrical
hysteresis around the threshold.
Output Considerations
In most cases, the push-pull outputs of the
MAX9025/MAX9027 are best for external hysteresis.
The open-drain output of the MAX9026/MAX9028 can
be used, but the effect of the feedback network on the
actual output high voltage must be considered.
Component Selection
Because the MAX9025–MAX9028 are intended for very
low power-supply systems, the highest impedance cir-
cuits should be used wherever possible. The offset
error due to input-bias current is proportional to the
total impedance seen at the input. For example, select-
ing components for Figure 3, with a target of 50mV hys-
teresis, a 5V supply, and choosing an RFB of 10M
gives RS as 100k. The total impedance seen at IN+ is
therefore 10M || 100k, or 99k. The maximum IB of
the MAX9025–MAX9028 is 2nA; therefore, the error due
to source impedance is less than 400V.
Asymmetrical Hysteresis
When the input threshold is not set at 1/2 VCC, the hys-
teresis added to the input threshold will not be symmet-
rical. This is typical of the MAX9025/MAX9026 where
the internal reference is usually used as the threshold.
If the asymmetry is unacceptable, it can be corrected
by adding resistors to the circuit.
Board Layout and Bypassing
Power-supply bypass capacitors are not typically need-
ed, but use 100nF bypass capacitors close to the
device’s supply pins when supply impedance is high,
supply leads are long, or excessive noise is expected
on the supply lines. Minimize signal trace lengths to
reduce stray capacitance. A ground plane and surface-
mount components are recommended. If the REF pin is
decoupled, use a new low-leakage capacitor.
Zero-Crossing Detector
Figure 4 shows a zero-crossing detector application.
The MAX9027’s inverting input is connected to ground,
and its noninverting input is connected to a 100mVP-P
signal source. As the signal at the noninverting input
crosses 0V, the comparator’s output changes state.
Logic-Level Translator
The Typical Application Circuit shows an application
that converts 5V logic to 3V logic levels. The MAX9028
is powered by the +5V supply voltage, and the pullup
resistor for the MAX9028’s open-drain output is con-
nected to the +3V supply voltage. This configuration
allows the full 5V logic swing without creating overvolt-
age on the 3V logic inputs. For 3V to 5V logic-level
translations, simply connect the +3V supply voltage to
VCC and the +5V supply voltage to the pullup resistor.
Hysteresis
R
V
S
FB
CC
=×
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| MAX902CPD | 功能描述:校驗器 IC High-Speed Voltage Comparator RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX902CPD+ | 功能描述:校驗器 IC High-Speed Voltage Comparator RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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