AD8027AR

更新时间： 2024-01-04 23:05:00

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器放大器电路光电二极管
页数	文件大小	规格书
24页	473K
描述
Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers

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技术参数
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AD8027AR 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	5.84
Base Number Matches：	1

AD8027AR 数据手册

AD8027/AD8028

APPLICATIONS

Using the AD8027/AD8028 SELECT Pin

other than the single 5 V supply already used by the ADC.

In this application, the SELECT pins are biased to avoid the

crossover region of the AD8028 for low distortion

operation.

The AD8027/AD8028 features a unique SELECT pin with two

functions. The first is a power-down function that places the

AD8027/AD8028 into low power consumption mode. In the

power-down mode, the amplifier draws 450 µA (typ) of supply

current.

+5V

0.1µF

–

15Ω

AD8028

4MHz LPF

+5V

The second function, as mentioned in the Theory of Operation

section, shifts the crossover point (where the NPN/PNP input

differential pairs transition from one to the other) closer to

either the positive supply rail or the negative supply rail. This

selectable crossover point allows the user to minimize

distortion based on the input signal and environment. The

default state is 1.2 V from the positive power supply, with the

SELECT pin left floating or in tri-state.

2.7nF

ANALOG INPUT +

INPUT RANGE

(0.15V TO 2.65V)

SELECT

(OPEN)

16 BITS

AD7677

+5V

0.1µF

–

15Ω

AD8028

ANALOG INPUT –

2.7nF

4MHz LPF

SELECT

(OPEN)

Table 6 shows the required voltages and modes of the

SELECT pin.

03327-A-059

Figure 60. Unity Gain Differential Drive

Table 6. SELECT Pin Mode Control

SELECT Pin Voltage (V)

As seen in Figure 61, the AD8028 and AD7677 combination

offers excellent integral nonlinearity (INL). Summary test data

for the schematic shown in Figure 60 is presented in Table 8.

Mode

V_S= 5 V

–5 to –4.2

V_S= +5 V V_S= +3 V

0 to 0.8 0 to 0.8

Disable

Crossover Referenced

–4.2 to –3.3 0.8 to 1.7 0.8 to 1.7

–1.2 V to Positive Supply

Crossover Referenced

+1.2 V to Negative Supply

Table 8. ADC Driver Performance,

f_C= 100 kHz, V_OUT= 4.7 V p-p

–3.3 to +5 1.7 to 5.0 1.7 to 3.0

Parameter

Measurement

–105dB

–102dB

–102 dB

105 dBc

Second Harmonic Distortion

Third Harmonic Distortion

THD

SFDR

When the input stage transitions from one input differential

pair to the other, there is virtually no noticeable change in the

output waveform.

The disable time of the AD8027/AD8028 amplifier is load

dependent. Typical data is presented in Table 7. See Figure 52

and Figure 53 for the actual switching measurements.

1.0

0.5

Table 7. DISABLE Switching Speeds

Supply Voltages (R_L= 1 kΩ)

5 V

+5 V

+3 V

t_ON

t_OFF

45 ns

980 ns

50 ns

1100 ns

50 ns

1150 ns

–0.5

–1.0

Driving a 16-Bit ADC

With the adjustable crossover distortion selection point and low

noise, the AD8028 is an ideal amplifier for driving or buffering

input signals into high resolution ADCs, such as the AD7677, a

16-Bit, 1 LSB INL, 1 MSPS differential ADC. Figure 60 shows

the typical schematic for driving the ADC. The AD8028

driving the AD7677 offers performance close to non-rail-to-

rail amplifiers and avoids the need for an additional supply,

16384

32768

CODE

49152

65536

03327-A-060

Figure 61. Integral Nonlinearity

Rev. B | Page 20 of 24

1...17 18 192021 22 23 24

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AD8027AR 替代型号

型号	品牌	替代类型	描述	数据表
AD8027ARZ-REEL7	ADI	完全替代	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARZ-REEL	ADI	完全替代	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARZ	ADI	完全替代	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers

与AD8027AR相关器件

型号	品牌	获取价格	描述	数据表
AD8027AR-REEL	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027AR-REEL7	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ART-R2	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ART-REEL	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ART-REEL7	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARTZ	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARTZ-R2	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARTZ-R21	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARTZ-REEL	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
AD8027ARTZ-REEL7	ADI	获取价格	Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers

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