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參數(shù)資料
| 型號： | MAX475 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single/Dual/Quad, 10MHz Single-Supply Op Amps |
| 中文描述： | 單/雙/四路、10MHz、單電源運算放大器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 144K |
| 代理商： | MAX475 |
M
The MAX473/MAX474/MAX475 have excellent phase
margin (the difference between 180° and the unity-gain
phase angle). It is typically 63° with a load of 10k
in
parallel with 20pF. Generally, higher phase margins
indicate greater stability.
Capacitive loads form an RC network with the op amp’s
output resistance, causing additional phase shift that
reduces the phase margin. Figure 3 shows the
MAX473/MAX474/MAX475 output response when dri-
ving a 390pF load in parallel with 10k
.
When driving large capacitive loads, add an output iso-
lation resistor, as shown in Figure 4. This resistor
improves the phase margin by isolating the load
capacitance from the amplifier output. Figure 5 shows
the MAX473/MAX474/MAX475 driving a capacitive load
of 1000pF using the circuit of Figure 4.
Feedbac k Resistors
The feedback resistors appear as a resistance network
to the op amp’s feedback input (Figure 2). This resis-
tance, combined with the op amp’s input and stray
capacitance (total input capacitance), forms a pole that
adds unwanted phase shift when either the total input
capacitance or feedback resistance is too large. For
example, using the noninverting configuration with a
gain of 10, if the total capacitance at the negative input
is 10pF and the effective resistance (R1
||
R2) is 9k
,
this RC network introduces a pole at f
o
= 1.8MHz. At
input frequencies above f
o
, the pole introduces addi-
tional phase shift, which reduces the overall bandwidth
and adversely affects stability. Choose feedback resis-
tors small enough so they do not adversely affect the
op amp’s operation at the frequencies of interest.
Overdriving the Outputs
The output voltage swing for specified operation is from
(V
EE
+ 0.3V) to (V
CC
- 0.5V) (see Electrical Characteristics.
Exercising the outputs beyond these limits drives the out-
put transistors toward saturation, resulting in bandwidth
degradation, response-time increase, and gain decrease
(which affects linearity). Operation in this region causes a
slight distortion in the output waveform, but does not
adversely affect the op amp.
S ingle/Dual/Quad, 10MHz
S ingle-S upply Op Amps
10
______________________________________________________________________________________
MAX473
V
EE
NULL
2k
NULL
1
4
8
V
IN
V
OUT
R1
R2
R3
R3 = R2
R1
V
IN
V
OUT
R3
R2
R1
R3 = R2
R1
Figure 1. Offset Null Circuit
Figure 2a. Reducing Offset Error Due to Bias Current:
Inverting Configuration
Figure 2b. Reducing Offset Error Due to Bias Current:
Noninverting Configuration
相關PDF資料 |
PDF描述 |
|---|---|
| MAX474CUA | Single/Dual/Quad, 10MHz Single-Supply Op Amps |
| MAX473-MAX475 | 3.3V CAN Transceiver with Standby Mode 8-SOIC -40 to 85 |
| MAX473CPA | Single/Dual/Quad, 10MHz Single-Supply Op Amps |
| MAX473CSA | Single/Dual/Quad, 10MHz Single-Supply Op Amps |
| MAX473EPA | CABLE ASSEMBLY; C MALE TO C MALE; 50 OHM, RG213/U COAX; 72" CABLE LENGTH |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4750EBE | 制造商:Maxim Integrated Products 功能描述:50OHM, LOW-VOLTAGE, QUAD SPST/DUAL SPDT ANALO - Rail/Tube |
| MAX4750EBE+ | 制造商:Maxim Integrated Products 功能描述:ANLG SW DUAL SPDT 11V 16UCSP - Rail/Tube |
| MAX4750EBE+T | 功能描述:模擬開關 IC RoHS:否 制造商:Texas Instruments 開關數(shù)量:2 開關配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4750EBE-T | 功能描述:模擬開關 IC RoHS:否 制造商:Texas Instruments 開關數(shù)量:2 開關配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4750ETE | 功能描述:模擬開關 IC RoHS:否 制造商:Texas Instruments 開關數(shù)量:2 開關配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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