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參數資料
| 型號： | MAX9002ESA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP LP HI SPEED 8-SOIC |
| 產品培訓模塊： | 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 |
To add hysteresis, use the following procedure:
Step 1: The device’s input bias current can be as high
as 80nA. To minimize error due to the input bias,
choose a value for R2 of 100k
(VREF / R2), which
allows a current of 12.33A at the upper trip point.
Step 2: Choose the width of the hysteresis band. In this
example, choose 20mV for the added external hystere-
sis (VEHYST = 20mV). Total hysteresis = VEHYST +
VIHYST = 24mV.
R1 = R2 (VEHYST - 2VIHYST) / (VDD + 2VIHYST)
where IHYST is the device’s internal hysteresis.
Step 3: Determine R1. If VDD = 5V, then R1 = 319
.
Step 4: Check the hysteresis trip points. The following
equation represents the upper trip point (VIN(H)):
VIN(H) = [(R1 + R2) / R2] (VREF + VIHYST) = 1.238V
The lower trip point is 24mV lower than upper trip point.
VIN(L) = 1.238V - 0.024V = 1.214V.
Comparator Propagation Delay
The comparator’s propagation delay is a function of the
input overdrive voltage. Overdrive voltage is measured
from beyond the edge of the offset and hysteresis-
determined trip points (see
Typical Operating
Characteristics for a graph of Propagation Delay vs.
Input Overdrive). High source impedance coupled with
the comparator’s input capacitance increases the prop-
agation delay. Large capacitive loads also increase the
propagation delay.
Shutdown
(S
SH
HD
DN
N)
Shutdown is active-low enabled. The SHDN input for
the MAX9001/MAX9004 can be taken above the posi-
tive supply without an increase in the SHDN input cur-
rent, allowing them to be driven from independent logic
circuits powered from a different supply voltage.
However, the logic threshold voltage requirements
must be met for proper operation. If SHDN is left
unconnected, the device defaults to the enabled mode
through an internal 4M
pull-up to VDD. If SHDN is to
be left unconnected, take proper care to ensure that no
signals are coupled to this pin, as this may cause false
triggering.
In shutdown mode, all outputs are set to a high-imped-
ance state and the supply current reduces to 2A.
Enable times for the op amp, comparator, and refer-
ence are 2s, 100ns, and 16s, respectively. Shutdown
delay times for the op amp, comparator, and reference
are 200ns, 100ns, and 1s, respectively (Figure 7).
________________Application Circuits
Radio Receiver for Alarms
and Detectors
Figure 8’s circuit is useful as a front end for RF alarms.
An unshielded inductor is used with capacitors C1A,
C1B, and C1C in a resonant circuit to provide frequen-
cy selectivity. The op amp from a MAX9003 amplifies
the signal received. The comparator improves noise
immunity, provides a signal-strength threshold, and
translates the received signal into a pulse train. The
tuned LC circuit in Figure 8 is set for 300kHz. The lay-
out and routing of components for the amplifier should
be tight to minimize 60Hz interference and crosstalk
from the comparator. Metal shielding is recommended
to prevent RFI from the comparator or digital circuitry
from exciting the receiving antenna. The transmitting
MAX9000–MAX9005
Low-Power, High-Speed, Single-Supply
Op Amp + Comparator + Reference ICs
______________________________________________________________________________________
15
5
s/div
SHDN
5V/div
AOUT
2V/div
COUT
5V/div
VREF
1V/div
MAX9000-FIG07
AV = +1V/V, CAIN+ = 2.5V, CCIN+ = 2.5V
Figure 7. Enable/Disable Response of Op Amp, Comparator,
and Reference to SHDN
REF
0.1
F
0.1
F
L1
33
H
C1A
390pF
1
(2
π fC) 2
C1B
0.01nF
C1C
10M
5.1M
9.1k
10k
1.230V
20k
VCC = 5V
COMP
ANTENNA
AMP
LAYOUT-SENSITIVE AREA,
METAL RFI SHIELDING ADVISED
MAX9003
L1 x C1 =
50-100pF
Figure 8. Radio Receiver Application
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相關代理商/技術參數 |
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| MAX9002ESA+ | 功能描述:高速運算放大器 Op Amp Comparator Reference IC RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX9002ESA+T | 功能描述:高速運算放大器 Op Amp Comparator Reference IC RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX9002ESA-T | 功能描述:高速運算放大器 Op Amp Comparator Reference IC RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX9002EUA | 功能描述:高速運算放大器 Op Amp Comparator Reference IC RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX9002EUA+ | 功能描述:高速運算放大器 Op Amp Comparator Reference IC RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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