參數(shù)資料
型號(hào)： AD8546ARMZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 0K
描述： IC OP AMP GP DUAL RR 8MSOP
標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝： 8-MSOP
包裝： 管件
AD8546
Rev. A | Page 17 of 24
APPLICATIONS INFORMATION
The AD8546 is a low input bias current, micropower CMOS
amplifier that operates over a wide supply voltage range of 2.7 V
to 18 V. The AD8546 also employs unique input and output stages
to achieve a rail-to-rail input and output range with a very low
supply current.
INPUT STAGE
Figure 62 shows the simplified schematic of the AD8546. The
input stage comprises two differential transistor pairs, an NMOS
pair (M1, M2) and a PMOS pair (M3, M4). The input common-
mode voltage determines which differential pair turns on and is
more active than the other.
The PMOS differential pair is active when the input voltage
approaches and reaches the lower supply rail. The NMOS pair
is needed for input voltages up to and including the upper
supply rail. This topology allows the amplifier to maintain a
wide dynamic input voltage range and maximize signal swing
to both supply rails.
For the majority of the input common-mode voltage range, the
PMOS differential pair is active. Differential pairs commonly
exhibit different offset voltages. The handoff from one pair to
the other creates a step-like characteristic that is visible in the
VOS vs. VCM graphs (see Figure 4 and Figure 7). This characteristic
is inherent in all rail-to-rail amplifiers that use the dual differential
pair topology. Therefore, always choose a common-mode voltage
that does not include the region of handoff from one input
differential pair to the other.
Additional steps in the VOS vs. VCM curves are also visible as the
input common-mode voltage approaches the power supply rails.
These changes are a result of the load transistors (M8, M9, M14,
and M15) running out of headroom. As the load transistors are
forced into the triode region of operation, the mismatch of their
drain impedances contributes to the offset voltage of the ampli-
fier. This problem is exacerbated at high temperatures due to
the decrease in the threshold voltage of the input transistors.
performance data.
Current Source I1 drives the PMOS transistor pair. As the input
common-mode voltage approaches the upper rail, I1 is steered
away from the PMOS differential pair through the M5 transistor.
The bias voltage, VB1, controls the point where this transfer occurs.
M5 diverts the tail current into a current mirror consisting of the
M6 and M7 transistors. The output of the current mirror then
drives the NMOS transistor pair. Note that the activation of this
current mirror causes a slight increase in supply current at high
common-mode voltages (see Figure 22 and Figure 25).
The AD8546 achieves its high performance by using low voltage
MOS devices for its differential inputs. These low voltage MOS
devices offer excellent noise and bandwidth per unit of current.
Each differential input pair is protected by proprietary regulation
circuitry (not shown in the simplified schematic). The regulation
circuitry consists of a combination of active devices that maintain
the proper voltages across the input pairs during normal opera-
tion and passive clamping devices that protect the amplifier during
fast transients. However, these passive clamping devices begin
to forward-bias as the common-mode voltage approaches either
power supply rail. This causes an increase in the input bias
The input devices are also protected from large differential input
voltages by clamp diodes (D1 and D2). These diodes are buffered
from the inputs with two 10 k resistors (R1 and R2). The differ-
ential diodes turn on whenever the differential voltage exceeds
approximately 600 mV; in this condition, the differential input
resistance drops to 20 k.
V+
V–
+IN x
R1
D1
D2
M1
M2
M7
M6
M3
M4
M5
VB1
M8
M10
M9
M16
M17
M11
VB2
OUT x
M12
M14
M13
M15
I1
R2
–IN x
09585-
062
Figure 62. Simplified Schematic
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(biāo)準(zhǔn)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(yīng)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(biāo)準(zhǔn)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(yīng)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(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR)
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