Datasheet > AS333Q

AS333Q

更新时间： 2023-12-06 20:07:37

品牌	Logo	应用领域
美台 - DIODES		/
页数	文件大小	规格书
11页	810K
描述
1.8V, Micropower CMOS Zero-Drift Operational Amplifiers

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AS333Q 数据手册

AS333Q

Application Information

Overview

The AS333Q is low power, zero-drift, high precision, rail-to-rail input and output operational amplifier, which adopts chopper-stabilized function

circuits to provide the advantage of minimizing input offset voltage and offset voltage drift over time and temperature. Its input common-mode

voltage range extends 0.1V beyond the supply rails to allow for sensing near ground or system V_DD. The device operates from a single-supply

voltage as low as 1.8V, is unity-gain stable, has no 1/f noise, has good PSRR and CMRR performance. These features make the part suitable for

a wide range of general-purpose applications, especially for low-power high precision ones.

Low Input Referred Noise

The device AS333Q is chopper stabilized amplifier, the flicker noise is reduced greatly because of this technique. The zero-drift chopper-stabilized

amplifiers are especially suited for accurate, high-gain amplification at lower frequencies. In general, they do not exhibit the higher bandwidth of

linear operational amplifier, and the location of their clock frequency establishes a practical frequency limit on signal fidelity. This makes

performance at low frequencies especially important, and the chopper-stabilized architecture further contributes to low frequency usefulness by

eliminating the classic linear operational amplifier 1/f input voltage noise. Many high gain sensor applications are at low frequencies, making zero-

drift amplifiers a natural choice for this function.

Below plots compared conventional amplifier voltage noise density behavior and zero-drift amplifier’s, this 1/f noise elimination in zero-drift

amplifier allows the AS333Q to have much lower noise at DC and low frequency compared to conventional low noise amplifier.

1000

1μ

V_CC= 5.0V, V_EE= 0V, A_V= 1

100

100n

10n

100

10k

100

10k

Frequency (Hz)

Figure 1. Input Voltage Noise in Conventional Amplifier

Driving a Capacitive Load

Figure 2. Input Voltage Noise in Zero-Drift Amplifier

The AS333Q can directly drive 200pF in unity-gain without oscillation. The unity-gain follower is the most sensitive configuration to capacitive

loading. Capacitive loading directly on the output terminal can decrease the device’s phase margin leading to high frequency ringing or oscillation.

To drive a heavier capacitive load, the circuit in Figure 3 can be used. The resistor R_NULLand C_Lform a pole to increase stability by adding more

phase margin to the system. The bigger R_NULLresistor value the more stable V_OUTis. Figure 4 and Figure 5 are AS333Q output pulse response

waveforms with and without R_NULL330Ω for load conditions C_L= 470pF and R_L= 10kΩ.

Figure 3. Capacitive Load with R_NULL

7 of 11

www.diodes.com

September 2023

AS333Q

Document number: DS45586 Rev. 3 - 2

1...4 5 678 9 10 11

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与AS333Q相关器件

型号	品牌	描述	获取价格	数据表
AS336	ETC	Voltage Reference	获取价格
AS336AN	CALOGIC	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, PBCY3, PLASTIC,	获取价格
AS336ANOPTION1	CALOGIC	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, PBCY3, PLASTIC,	获取价格
AS336ANOPTION2	CALOGIC	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, PBCY3, PLASTIC,	获取价格
AS336ANOPTION3	CALOGIC	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, PBCY3, PLASTIC,	获取价格
AS336ANOPTION4	CALOGIC	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, PBCY3, PLASTIC,	获取价格

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