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參數(shù)資料
| 型號： | AD8527AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 7 MHz Rail-to-Rail Low Voltage Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 5000 uV OFFSET-MAX, 7 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 160K |
| 代理商： | AD8527AR |
AD8517/AD8527
–8–
REV. B
V
–
TIME
–
1s/Div
V
S
= 2.5V
A
V
= 120k
T
A
= 25 C
Figure 15. 0.1 Hz to 10 Hz Noise
TIME
–
200 s/Div
0
0
0
V
–
0
0
0
0
0
V
S
= 2.5V
A
V
= + 1
V
IN
= SINEWAVE
T
A
= 25 C
Figure 16. No Phase Reversal
THEORY OF OPERATION
The AD85x7 is a rail-to-rail operational amplifier that can operate at
supply voltages as low as 1.8 V. This family is fabricated using Analog
Devices’ high-speed complementary bipolar process, also called
XFCB. The process trench isolates each transistor to minimize
parasitic capacitance thereby allowing high-speed performance.
Figure 19 shows a simplified schematic of the AD85x7 family.
The input stage consists of two parallel complementary differen-
tial pair: one NPN pair (Q1 and Q2) and one PNP pair (Q3 and
Q4). The voltage drops across R7. R8, R9, and R10 are kept low
for rail-to-rail operation. The major gain stage of the op amp is a
double-folded cascode consisting of transistors Q5, Q6, Q8, and
Q9. The output stage, which also operates rail-to-rail, is driven by
Q14. The transistors Q13 and Q10 act as level-shifters to give
more headroom during 1.8 V operation.
As the voltage at the base of Q13 increases, Q18 starts to sink
current. When the voltage at the base of Q13 decreases, I8 flows
through D16 and Q15 increasing the VBE of Q17, then Q20
sources current.
The output stage also furnishes gain, which depends on the load
resistance, since the output transistors are in common emitter
configuration. The output swing when sinking or sourcing 250
μ
A
is 35 mV from each rail.
The input bias current characteristics depend on the common-
mode voltage, see Figure 4. As the input voltage reaches about
1 V below V
CC
, the PNP pair (Q3 and Q4) turns off.
The 1 k
input resistor R1 and R2, together with the diodes D7
and D8, protect the input pairs against avalanche damage.
The AD85x7 family exhibits no phase reversal as the input
signal exceeds the supply by more than 0.6 V. Excessive current
can flow through the input pins via the ESD diodes D1–D2 or
D3–D4, in the event their ~0.6 V thresholds are exceeded. Such
fault currents must be limited to 5 mA or less by the use of
external series resistance(s).
LOW VOLTAGE OPERATION
Battery Voltage Discharge
The AD8517 operates at supply voltages as low as 1.8 V. This
amplifier is ideal for battery-powered applications since it can
operate at the end of discharge voltage of most popular batteries.
Table I lists the Nominal and End of Discharge Voltages of several
typical batteries.
TIME
–
500ns/Div
V
–
V
S
= 2.5V
A
V
= 1
T
A
= 25 C
C
L
= 100pF
R
L
= 10k
Figure 17. Small Signal Transient Response
TIME
–
200ns/Div
V
–
V
S
= 2.5V
A
V
= 1
R
L
= 10k
T
A
= 25 C
Figure 18. Large Signal Transient Response
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8527ARM-REEL | 7 MHz Rail-to-Rail Low Voltage Operational Amplifiers |
| AD8519AR | 8 MHz Rail-to-Rail Operational Amplifiers |
| AD8519ART | 8 MHz Rail-to-Rail Operational Amplifiers |
| AD8529AR | 8 MHz Rail-to-Rail Operational Amplifiers |
| AD8529ARM | 8 MHz Rail-to-Rail Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8527ARM-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 6V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:DUAL, LOW PWR RAIL/RAIL OP AMP - Bulk |
| AD8527ARM-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 6V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:DUAL, LOW PWR RAIL/RAIL OP AMP - Tape and Reel |
| AD8527ARMZ | 制造商:Analog Devices 功能描述: |
| AD8527ARMZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 6V 8-Pin MSOP T/R |
| AD8527ARMZ-REEL | 功能描述:IC OPAMP GP R-R 7MHZ DUAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
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