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| 型号： | MAX9120EXK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/14页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR BTR SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | Beyond-the-Rails™ |
| 类型： | 通用 |
| 元件数： | 1 |
| 输出类型： | CMOS，开漏极，轨至轨，TTL |
| 电压 - 电源，单路/双路(±)： | 1.6 V ~ 5.5 V |
| 电压 - 输入偏移（最小值）： | 5mV @ 5V |
| 电流 - 输入偏压（最小值）： | 0.001µA @ 5V |
| 电流 - 输出（标准）： | 50mA |
| 电流 - 静态（最大值）： | 1.2µA |
| CMRR, PSRR（标准）： | 66.02dB CMRR，80dB PSRR |
| 传输延迟（最大）： | 45µs |
| 磁滞： | 4mV |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 安装类型： | 表面贴装 |
| 包装： | 标准包装 |
| 产品目录页面： | 1391 (CN2011-ZH PDF) |
| 其它名称： | MAX9120EXK+TDKR |
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
10
______________________________________________________________________________________
Reference (MAX9117/MAX9118)
The internal reference in the MAX9117/MAX9118 has an
output voltage of +1.252V with respect to VEE. Its typical
temperature coefficient is 100ppm/°C over the full
-40°C to +85°C temperature range. The reference is a
PNP emitter-follower driven by a 120nA current source
(Figure 1). The output impedance of the voltage refer-
ence is typically 200k
, preventing the reference from
driving large loads. The reference can be bypassed with
a low-leakage capacitor. The reference is stable for any
capacitive load. For applications requiring a lower output
impedance, buffer the reference with a low-input-leak-
age op amp, such as the MAX4162.
Applications Information
Low-Voltage, Low-Power Operation
The MAX9117–MAX9120 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 MAX9117–MAX9120, assuming nominal
conditions.
Internal Hysteresis
Many comparators oscillate in the linear region of oper-
ation because of noise or undesired parasitic feed-
back. This tends to occur when the voltage on one
input is equal or very close to the voltage on the other
input. The MAX9117–MAX9120 have internal 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.
Additional Hysteresis (MAX9117/MAX9119)
The MAX9117/MAX9119 have a 4mV internal hysteresis
band (VHB). Additional hysteresis can be generated
with three resistors using positive feedback (Figure 3).
Unfortunately, this method also slows hysteresis re-
sponse time. Use the following procedure to calculate
resistor values.
1) Select R3. Leakage current at IN is under 2nA, so the
current through R3 should be at least 0.2A to mini-
mize errors caused by leakage current. The current
through R3 at the trip point is (VREF - VOUT) / R3.
Considering the two possible output states in solving
for R3 yields two formulas: R3 = VREF / IR3 or R3 =
(VCC - VREF) / IR3. Use the smaller of the two result-
ing resistor values. For example, when using the
120nA
REF
VCC
VEE
VBIAS
Figure 1. MAX9117/MAX9118 Voltage Reference Output
Equivalent Circuit
Table 1. Battery Applications Using MAX9117–MAX9120
BATTERY
TYPE
RECHARGEABLE
VFRESH
(V)
VEND-OF-LIFE
(V)
CAPACITY,
AA SIZE
(mA-h)
MAX9117/MAX9118
OPERATING TIME
(hr)
Alkaline
(2 Cells)
No
3.0
1.8
2000
2.5 x 106
Nickel-Cadmium
(2 Cells)
Yes
2.4
1.8
750
937,500
1.25 x 106
1000
2.7
3.5
Yes
Lithium-Ion
(1 Cell)
Nickel-Metal-
Hydride
(2 Cells)
Yes
2.4
1.8
1000
1.25 x 106
MAX9119/MAX9120
OPERATING TIME
(hr)
5 x 106
1.875 x 106
2.5 x 106
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