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参数资料
| 型号： | ADA4851-4YRUZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/25页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R QUAD LP 14TSSOP |
| 标准包装： | 1,000 |
| 放大器类型： | 电压反馈 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 375 V/µs |
| -3db带宽： | 105MHz |
| 电流 - 输入偏压： | 2.2µA |
| 电压 - 输入偏移： | 600µV |
| 电流 - 电源： | 2.9mA |
| 电流 - 输出 / 通道： | 83mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 12 V，±1.35 V ~ 6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 带卷 (TR) |
ADA4851-1/ADA4851-2/ADA4851-4
Rev. J | Page 17 of 24
CIRCUIT DESCRIPTION
The ADA4851-1/ADA4851-2/ADA4851-4 feature a high slew
rate input stage that is a true single-supply topology, capable of
sensing signals at or below the negative supply rail. The rail-to-
rail output stage can pull within 60 mV of either supply rail when
driving light loads and within 0.17 V when driving 150 Ω. High
speed performance is maintained at supply voltages as low as 2.7 V.
HEADROOM CONSIDERATIONS
These amplifiers are designed for use in low voltage systems.
To obtain optimum performance, it is useful to understand the
behavior of the amplifiers as input and output signals approach
the headroom limits of the amplifiers. The input common-mode
voltage range of the amplifiers extends from the negative supply
voltage (actually 200 mV below the negative supply), or from
ground for single-supply operation, to within 2.2 V of the positive
supply voltage. Therefore, at a gain of 3, the amplifiers can
provide full rail-to-rail output swing for supply voltages as low
as 3.3 V and down to 3 V for a gain of 4.
Exceeding the headroom limit is not a concern for any inverting
gain on any supply voltage as long as the reference voltage at the
positive input of the amplifier lies within the input common- mode
range of the amplifier.
The input stage is the headroom limit for signals approaching
the positive rail. Figure 40 shows a typical offset voltage vs. the
input common-mode voltage for the ADA4851-1/ADA4851-2/
ADA4851-4 amplifiers on a ±5 V supply. Accurate dc performance
is maintained from approximately 200 mV below the negative
supply to within 2.2 V of the positive supply. For high speed
signals, however, there are other considerations. Figure 41
shows 3 dB bandwidth vs. input common-mode voltage for a
unity-gain follower. As the common-mode voltage approaches
2 V of positive supply, the amplifier responds well but the
bandwidth begins to drop as the common-mode voltage
approaches the positive supply. This can manifest itself in
increased distortion or settling time. Higher frequency signals
require more headroom than the lower frequencies to maintain
distortion performance.
600
580
560
540
520
500
480
460
440
–6
–5
–4
–3
–2
–1
0
1
2
3
4
V
OS
(
μV)
VCM (V)
05143-046
Figure 40. VOS vs. Common-Mode Voltage, VS = ±5 V
–6
–5
–4
–3
–2
–1
0
1
GAIN
(
d
B)
0.1
10
1
100
05143-050
FREQUENCY (MHz)
2
1000
G = +1
RL = 1kΩ
VS = 5V
VCM = 3.0V
VCM = 3.1V
VCM = 3.2V
VCM = 3.3V
Figure 41. Unity-Gain Follower Bandwidth vs. Input Common-Mode
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