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參數(shù)資料
| 型號： | MAX9028EBT+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/14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(shù)： | 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
10
______________________________________________________________________________________
Reference (MAX9025/MAX9026)
The MAX9025–MAX9028s’ internal +1.236V reference
has a typical temperature coefficient of 40ppm/°C over
the full -40°C to +85°C temperature range. The reference
is a very-low-power bandgap cell, with a typical 35k
output impedance. REF can source and sink up to
100nA to external circuitry. For applications needing
increased drive, buffer REF with a low input-bias current
op amp such as the MAX4162. Most applications require
no REF bypass capacitor. For noisy environments or fast
VCC transients, connect a 1nF to 10nF ceramic capacitor
from REF to GND.
Applications Information
Low-Voltage, Low-Power Operation
The MAX9025–MAX9028 are ideally suited for use with
most battery-powered systems. Table 1 lists a variety of
battery types, capacities, and approximate operating
times for the MAX9025–MAX9028, assuming nominal
conditions.
Internal Hysteresis
Many comparators oscillate in the linear region of opera-
tion because of noise or undesired parasitic feedback.
This tends to occur when the voltage on one input is
equal or very close to the voltage on the other input. The
MAX9025–MAX9028 have internal 4mV hysteresis to
counter parasitic effects and noise.
The hysteresis in a comparator creates two trip points:
one for the rising input voltage (VTHR) and one for the
falling input voltage (VTHF) (Figure 2). The difference
between the trip points is the hysteresis (VHB). When
the comparator’s input voltages are equal, the hystere-
sis effectively causes one comparator input to move
quickly past the other, thus taking the input out of the
region where oscillation occurs. Figure 2 illustrates the
case in which IN- has a fixed voltage applied, and IN+
is varied. If the inputs were reversed, the figure would
be the same, except with an inverted output.
Adding External Hysteresis
In applications requiring more than the internal 4mV
hysteresis of the MAX9025–MAX9028, additional hys-
teresis can be added with external components.
Because the MAX9025–MAX9028 are intended for very
low-power systems, care should be taken to minimize
power dissipation in the additional circuitry.
Regardless of which approach is taken, the external
hysteresis will be VCC dependent. Over the full discharge
range of battery-powered systems, the hysteresis can
change as much as 40%. This must be considered
during design.
BANDGAP
REF
VEE
VCC
Figure 1. MAX9025/MAX9026 Voltage Reference Output
Equivalent Circuit
Table 1. Battery Applications Using MAX9025–MAX9028
BATTERY
TYPE
RECHARGEABLE VFRESH (V)
VEND-OF-LIFE
(V)
CAPACITY,
AA SIZE
(mA-H)
MAX9025/MAX9026
OPERATING TIME
(hr)
MAX9027/MAX9028
OPERATING TIME
(hr)
Alkaline
(2 Cells)
No
3.0
1.8
2000
1.8 x 10
6
2.8 x 10
6
Nickel-
Cadmium
(2 Cells)
Yes
2.4
1.8
750
680,000
1.07 x 10
6
Lithium-Ion
(1 Cell)
Yes
3.5
2.7
1000
0.9 x 10
6
1.4 x 10
6
Nickel-Metal-
Hydride
(2 Cells)
Yes
2.4
1.8
1000
0.9 x 10
6
1.4 x 10
6
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