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參數(shù)資料
| 型號： | AD548KN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Precision, Low Power BiFET Op Amp |
| 中文描述： | OP-AMP, 700 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDIP8 |
| 封裝： | MINI, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 430K |
| 代理商： | AD548KN |
AD548
–8–
REV. C
Figure 2. Board Layout for Guarding Inputs
INPUT PROTECTION
The AD548 is guaranteed to withstand input voltages equal to
the power supply potential. Exceeding the negative supply volt-
age on either input will forward bias the substrate junction of
the chip. The induced current may destroy the amplifier due to
excess heat.
Input protection is required in applications such as a flame
detector in a gas chromatograph, where a very high potential
may be applied to the input terminals during a sensor fault
condition. Figure 3 shows a simple current limiting scheme that
can be used. R
PROTECT
should be chosen such that the maxi-
mum overload current is 1.0 mA (l00 k
for a 100 V overload,
for example).
Exceeding the negative common-mode range on either input
terminal causes a phase reversal at the output, forcing the
amplifier output to the corresponding high or low state. Exceed-
ing the negative common-mode on both inputs simultaneously
forces the output high. Exceeding the positive common-mode
range on a single input does not cause a phase reversal, but if
both inputs exceed the limit the output will be forced high. In
all cases, normal amplifier operation is resumed when input
voltages are brought back within the common-mode range.
Figure 3. Input Protection of IV Converter
D/A CONVERTER OUTPUT BUFFER
The circuit in Figure 4 shows the AD548 and AD7545 12-bit
CMOS D/A converter in a unipolar binary configuration. V
OUT
will be equal to V
REF
attenuated by a factor depending on the
digital word. V
REF
sets the full scale. Overall gain is trimmed by
adjusting R
IN
. The AD548’s low input offset voltage, low drift,
and clean dynamics make it an attractive low power output buffer.
The input offset voltage of the AD548 output amplifier results
in an output error voltage. This error voltage equals the input
offset voltage of the op amp times the noise gain of the amplifier.
Figure 4. AD548 Used as DAC Output Amplifier
That is:
V
OS
Output
=
V
OS
Input
1
+
R
FB
R
O
R
FB
is the feedback resistor for the op amp, which is internal to
the DAC. R
O
is the DAC
’
s R-2R ladder output resistance. The
value of R
O
is code dependent. This has the effect of changing
the offset error voltage at the amplifier
’
s output. An output
amplifier with a sub millivolt input offset voltage is needed to
preserve the linearity of the DAC
’
s transfer function.
The AD548 in this configuration provides a 700 kHz small
signal bandwidth and 1.8 V/
μ
s typical slew rate. The 33 pF
capacitor across the feedback resistor optimizes the circuit
’
s
response. The oscilloscope charts in Figures 5 and 6 show small
and large signal outputs of the circuit in Figure 4. Upper traces
show the input signal V
IN
. Lower traces are the resulting output
voltage with the DAC
’
s digital input set to all 1s. The AD548
settles to
±
0.01% for a 20 V input step in 14
μ
s.
0%
10
5V
5μS
20V
100
90
Figure 5. Response to
±
20 V p-p Reference Square Wave
0%
10
50mV
2μS
200mV
100
90
Figure 6. Response to
±
100 mV p-p Reference Square Wave
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD548KR | Precision, Low Power BiFET Op Amp |
| AD548S | Precision, Low Power BiFET Op Amp |
| AD548JCHIPS | Precision, Low Power BiFET Op Amp |
| AD549* | Ultralow Input Bias Current Operational Amplifier |
| AD549JCHIPS | THERMISTOR, PTC; Series:B598; Thermistor type:PTC; Resistance:10R; Tolerance, resistance:+/-25%; Temp, op. max:125(degree C); Voltage, operating:160V; Case style:Radial; Current, tripping:0.5A; Diameter, body:13.5mm; Length, RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD548KN/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Operational Amplifier |
| AD548KNZ | 功能描述:IC OPAMP GP 1MHZ LP PREC 8DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD548KNZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Analog Devices 功能描述:IC, OP-AMP, 1MHZ, 1.8V/ us, DIP-8 |
| AD548KR | 制造商:Rochester Electronics LLC 功能描述:LOW POWER BIFET OP AMP IC - Bulk |
| AD548KR-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision, Low Power BiFET Op Amp |
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