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參數(shù)資料
| 型號： | MAX44269EWL+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPARATOR DUAL LP 9WLP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 類型： | 通用 |
| 元件數(shù)： | 2 |
| 輸出類型： | 開路漏極 |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V |
| 電流 - 靜態(tài)（最大值）： | 1µA |
| 磁滯： | 6mV |
| 封裝/外殼： | 9-WFBGA，WLBGA |
| 安裝類型： | 表面貼裝 |
| 包裝： | 標準包裝 |
| 其它名稱： | MAX44269EWL+TDKR |
Maxim Integrated Products 9
MAX44269
1.3mm x 1.3mm, Low-Power
Dual Comparator
Use the following procedure to calculate resistor values.
1) Select R3. Input bias current at IN_+ is less than15nA.
To minimize errors caused by the input bias current,
the current through R3 should be at least 1.5A.
Current through R3 at the trip point is (VREF - VOUT)/
R3. Considering the two possible output states in solv-
ing for R3 yields two formulas:
R3 = VREF/IR3 and R3 = [(VCC - VREF)/IR3] - R1
Use the smaller of the two resulting resistor values.
For example, for VCC = 5V, IR3 = -1.5A, R1 = 200kI,
and a VREF = 1.24V, the two resistor values are 827kI
and 1.5MI. Therefore, for R3 choose the standard
value of 825kI.
2) Choose the hysteresis band required (VHB). In this
example, the VHB = 50mV.
3) Calculate R2 according to the following equation:
=
+
+
HB
CC
REF
V
R2 (R1 R3)
x R1) / R3
(V
V
For this example, insert the value:
50mV
R2 (200k
0.825M )
9.67k
5.3
=
+
=
For this example, choose standard value R2 = 9.76kI.
4) Choose the trip point for VIN rising (VTHR) in such a
way that:
HB
THR
REF
CC
V
V1
V
>+
VTHR is the threshold voltage at which the com-
parator switches its output from low to high, as VIN
rises above the trip point. For this example, choose
VTHR = 3V.
5) Calculate R4 as follows:
THR
REF
1
R4
11
V
x R2
R2
R3
V
1
R4
6.93k
3
11
1.24 x 9.76
9.76
825
=
=
For this example, choose a standard value of 6.98kI.
6) Verify the trip voltages and hysteresis as follows:
THR
REF
THF
REF
CC
11
1
xR2
VV
R2
R3
R4
11
1
x R2
VV
R2
R1 R3
R4
R2
x V
R1 R3
=
++
=
++
+
+
The hysteresis network in Figure 2 can be simplified if the
reference voltage is chosen to be at midrail and the trip
points of the comparator are chosen to be symmetrical
about the reference voltage. Use the circuit in Figure 3
if the reference voltage can be designed to be at the
center of the hysteresis band. For the symmetrical case,
follow the same steps outlined in the paragraph above
to calculate the resistor values except that in this case,
resistor R4 approaches infinity (open). So in the previous
example with VREF = 2.5V, if VTHR = 2.525V and VTHF
= 2.475V then using the above formulas, we get R1 =
200kI, R2 = 9.09kI and R3 = 825kI, R4 = not installed.
Jack Detect
The IC can be used to detect peripheral devices
connected to a circuit. This includes a simple jack-
detect scheme for cell phone applications. The Typical
Application Circuit shows how the device can be used in
conjunction with an external reference to detect a remote
key connection and an accessory ID input. The open-
drain output of the devices allows the output logic level
to be controlled independent of the peripheral device’s
load, making interfacing and controlling external devices
as simple as monitoring a few digital inputs on a micro-
controller or codec.
Figure 3. Simplified External Hysteresis Network if VREF is at
the Center of the Hysteresis Band
VCC
R2
R3
R1
VIN
VREF
GND
OUT
MAX44269
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