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參數(shù)資料
| 型號： | MAX953ESA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP SS LP 8-SOIC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 100 |
| 類型： | 放大器，比較器 |
| 應用： | 智能卡 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 管件 |
MAX951–MAX954
In the example, RA is again 24k
.
6) Select the upper trip point VS(H). Our example is set
at 4.75V.
7) Calculate RB.
where RB 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 (VDD = 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
values (VDD = 5V) are 4mV for the plastic DIP package
and 280V for the SO package.
Op Amp Stability and Board Layout
Considerations
Unlike other industry-standard micropower CMOS
op amps, the op amps in the MAX951–MAX954 main-
tain 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-
frequency 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
provides 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 capaci-
tor across the feedback resistor to compensate; select
the smallest capacitor value that ensures stability.
Input Overdrive
With 100mV overdrive, comparator propagation delay
is typically 6s. 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 15A and 32A for supply voltages of
2.8V and 7V, respectively.
R
VV
R
RV
V
R
B
REF
IHYST
A
S H
REF
IHSYT
A
=
+
() ( )( )
()
+
()
+
()
2
22
RR
V
for V
V
A
SHYST
DD
SHYST
IHYST
≈>>
2,
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
10
_______________________________________________________________________________________
R2
R1
2pF to 10pF
AMPOUT
AMPIN+
REF
0.1
F
0.1
F
L1
330mH
C1A
390pF
1
(2
πfC)2
C1B
330pF
C1C
20pF to
60pF
10M
5.1M
1M
100k
1.2V
20k
VCC = 5V
COMP
ANTENNA
AMP
LAYOUT-SENSITIVE AREA,
METAL RFI SHIELDING ADVISED
MAX952
L1 x C1 =
Figure 3. Compensation for Feedback-Node Capacitance
Figure 4. Low-Frequency Radio Receiver Application
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX953ESA+ | 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX953ESA+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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX953ESA-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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX953EUA | 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX953EUA+ | 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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