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| 型號： | AD8546ARMZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP GP DUAL RR 8MSOP |
| 標準包裝： | 50 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.07 V/µs |
| 增益帶寬積： | 200kHz |
| 電流 - 輸入偏壓： | 5pA |
| 電壓 - 輸入偏移： | 14000µV |
| 電流 - 電源： | 18µA |
| 電流 - 輸出 / 通道： | 12mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 18 V，±1.35 V ~ 9 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設(shè)備封裝： | 8-MSOP |
| 包裝： | 管件 |
AD8546
Rev. A | Page 18 of 24
OUTPUT STAGE
The AD8546 features a complementary output stage consisting
of the M16 and M17 transistors (see Figure 62). These transistors
are configured in Class AB topology and are biased by the voltage
source, VB2. This topology allows the output voltage to go within
millivolts of the supply rails, achieving a rail-to-rail output swing.
The output voltage is limited by the output impedance of the
transistors, which are low RON MOS devices. The output voltage
swing is a function of the load current and can be estimated using
the output voltage to supply rail vs. load current diagrams (see
RAIL-TO-RAIL INPUT AND OUTPUT
The AD8546 features rail-to-rail input and output with a supply
voltage from 2.7 V to 18 V. Figure 63 shows the input and output
waveforms of the AD8546 configured as a unity-gain buffer with
a supply voltage of ±9 V and a resistive load of 1 M . With an
input voltage of ±9 V, the AD8546 allows the output to swing
very close to both rails. Additionally, it does not exhibit phase
reversal.
TIME (200s/DIV)
V
OLTA
GE
(
5
V
/D
IV
)
VSY = ±9V
RL = 1M
09585-
063
INPUT
OUTPUT
Figure 63. Rail-to-Rail Input and Output
RESISTIVE LOAD
The feedback resistor alters the load resistance that an amplifier
sees. It is, therefore, important to be aware of the value of the
feedback resistors selected for use with the AD8546. The AD8546
is capable of driving resistive loads down to 100 k . The following
two examples, inverting and noninverting configurations, show
how the feedback resistor changes the actual load resistance seen
at the output of the amplifier.
Inverting Configuration
Figure 64 shows the AD8546 in an inverting configuration with a
resistive load, RL, at the output. The actual load seen by the ampli-
fier is the parallel combination of the feedback resistor, R2, and
the load, RL. The combination of a feedback resistor of 1 k and
a load of 1 M results in an equivalent load resistance of 999 at
the output. In this condition, the AD8546 is incapable of driving
such a heavy load; therefore, its performance degrades greatly.
To avoid loading the output, use a larger feedback resistor, but
consider the effect of resistor thermal noise on the overall circuit.
AD8546
1/2
R1
R2
RL
–VSY
RL, EFF = RL || R2
+VSY
VIN
VOUT
09585-
064
Figure 64. Inverting Op Amp Configuration
Noninverting Configuration
Figure 65 shows the AD8546 in a noninverting configuration
with a resistive load, RL, at the output. The actual load seen by
the amplifier is the parallel combination of R1 + R2 and RL.
R1
R2
RL
–VSY
RL, EFF = RL || (R1 + R2)
+VSY
VIN
VOUT
09585-
065
AD8546
1/2
Figure 65. Noninverting Op Amp Configuration
COMPARATOR OPERATION
An op amp is designed to operate in a closed-loop configuration
with feedback from its output to its inverting input. Figure 66
shows the AD8546 configured as a voltage follower with an input
voltage that is always kept at midpoint of the power supplies.
The same configuration is applied to the unused channel. A1 and
A2 indicate the placement of ammeters to measure supply current.
ISY+ refers to the current flowing from the upper supply rail to the
op amp, and ISY refers to the current flowing from the op amp to
the lower supply rail. As expected, Figure 67 shows that in normal
operating condition, the total current flowing into the op amp is
equivalent to the total current flowing out of the op amp, where
ISY+ = ISY = 36 μA for the dual AD8546 at VSY = 18 V.
AD8546
1/2
A1
100k
100k
ISY+
+VSY
VOUT
–VSY
ISY–
A2
09585-
066
Figure 66. Voltage Follower Configuration
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| AD8546ARMZ_PROMO | 制造商:Analog Devices 功能描述:IC OP AMP DUAL RR MSOP-8 |
| AD8546ARMZ-R7 | 功能描述:IC OP AMP RR DUAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設(shè)備封裝:16-SOIC N 包裝:管件 |
| AD8546ARMZ-RL | 功能描述:IC OP AMP RR DUAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設(shè)備封裝:16-SOIC N 包裝:管件 |
| AD8548 | 制造商:AD 制造商全稱:Analog Devices 功能描述:22 μA, RRIO, CMOS, 18 V |
| AD8548ACPZ-R7 | 功能描述:IC AMP QUAD MICROPWR 16V 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
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