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參數(shù)資料
| 型號(hào)： | MAX954ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Ultra-Low-Power, Single-Supply Op Amp Comparator Reference |
| 中文描述： | OP-AMP, 4000 uV OFFSET-MAX, 125 MHz BAND WIDTH, PDSO8 |
| 封裝： | SO-8 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 114K |
| 代理商： | MAX954ESA |
M
In the example, R
A
is again 24k
.
6) Select the upper trip point V
S(H)
. Our example is set
at 4.75V.
7) Calculate R
B
.
(
(
R
B
is 8.19k
, or approximately 8.2k
.
Input Noise Considerations
Because low power requirements often demand high-
impedance circuits, effects from radiated noise are more
significant. Thus, traces between the op-amp or com-
parator inputs and any resistor networks attached should
be kept as short as possible.
Crosstalk
Reference
Internal crosstalk to the reference from the comparator
is package dependent. Typical values (V
DD
= 5V) are
45mV for the plastic DIP package and 32mV for the SO
package. Applications using the reference for the op
amp or external circuitry can eliminate this crosstalk by
using a simple RC lowpass filter, as shown in Figure 5.
Op Amp
Internal crosstalk to the op amp from the comparator is
package dependent, but not input referred. Typical val-
ues (V
DD
= 5V) are 4mV for the plastic DIP package
and 280μV for the SO package.
Op-Amp S tability and Board Layout
Considerations
Unlike other industry-standard micropower CMOS op
amps, the op amps in the MAX951–MAX954 maintain
stability in their minimum gain configuration while driving
heavy capacitive loads, as demonstrated in the
MAX951/MAX953 Op-Amp Percent Overshoot vs.
Capacitive Load graph in the Typical Operating
Characteristics.
Although this family is primarily designed for low-fre-
quency applications, good layout is extremely impor-
tant. Low-power, high-impedance circuits may increase
the effects of board leakage and stray capacitance. For
example, the combination of a 10M
resistance (from
leakage between traces on a contaminated, poorly
designed PC board) and a 1pF stray capacitance pro-
vides a pole at approximately 16kHz, which is near the
amplifier’s bandwidth. Board routing and layout should
minimize leakage and stray capacitance. In some
cases, stray capacitance may be unavoidable and it
may be necessary to add a 2pF to 10pF capacitor
across the feedback resistor to compensate; select the
smallest capacitor value that ensures stability.
Input Overdrive
With 100mV overdrive, comparator propagation delay
is typically 6μs. The Typical Operating Characteristics
show propagation delay for various overdrive levels.
Supply current can increase when the op amp in the
MAX951–MAX954 is overdriven to the negative supply rail.
For example, when connecting the op amp as a compara-
tor and applying a -100mV input overdrive, supply current
rises by around 15μA and 32μA for supply voltages of
2.8V and 7V, respectively.
R
V
V
R
R
)
R
V
V
V
R
R
B
REF
IHYST
A
(
S H
REF
IHSYT
A
=
+
(
) (
)(
)
)
+
+
)
2
2
2
R
R
V
V
for V
V
A
SHYST
DD
SHYST
IHYST
≈
>>
2
,
Ultra-Low-Power, S ingle-S upply
Op Amp + Comparator + Referenc e
10
______________________________________________________________________________________
R2
R1
2pF to 10pF
AMPOUT
AMPIN+
REF
0.1
μ
F
0.1
μ
F
L1
330mH
C1
A
390pF
π
f
C
)
2
C1
B
330pF
C1
C
20-60pF
10M
5.1M
1.0M
100k
1.2V
20k
V
CC
= 5V
COMP
ANTENNA
AMP
LAYOUT-SENSITIVE AREA,
METAL RFI SHIELDING ADVISED
MAX952
(2
Figure 3. Compensation for Feedback-Node Capacitance
Figure 4. Low-Frequency Radio Receiver Application
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX954ESA+ | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX954ESA+T | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX954ESA-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX954EUA | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX954EUA+ | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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