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參數(shù)資料
| 型號(hào)： | AD8014ARZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF LP LN LDIST 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 750 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 4600 V/µs |
| -3db帶寬： | 480MHz |
| 電流 - 輸入偏壓： | 5µA |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 1.15mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 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-SOIC |
| 包裝： | 帶卷 (TR) |
AD8014
–8–
Note: On Figures 19 and 20 RF = 500
, R
S = 50
and C
L =
20 pF.
APPLICATIONS
CD ROM and DVD Photodiode Preamp
High speed Multi-X CD ROM and DVD drives require high
frequency photodiode preamps for their read channels. To mini-
mize the effects of the photodiode capacitance, the low imped-
ance of the inverting input of a current feedback amplifier is
advantageous. Good group delay characteristics will preserve the
pulse response of these pulses. The AD8014, having many ad-
vantages, can make an excellent low cost, low noise, low power,
and high bandwidth photodiode preamp for these applications.
Figure 21 shows the circuit that was used to imitate a photo-
diode preamp. A photodiode for this application is basically a
high impedance current source that is shunted by a small ca-
pacitance. In this case, a high voltage pulse from a Picosecond
Pulse Labs Generator that is ac-coupled through a 20 k
resis-
tor is used to simulate the high impedance current source of a
photodiode. This circuit will convert the input voltage pulse into
a small charge package that is converted back to a voltage by the
AD8014 and the feedback resistor.
In this case the feedback resistor chosen was 1.74 k
, which is a
compromise between maintaining bandwidth and providing
sufficient gain in the preamp stage. The circuit preserves the
pulse shape very well with very fast rise time and a minimum of
overshoot as shown in Figure 22.
AD8014
1.74k
20k
49.9
+5V
–5V
OUTPUT
(10 PROBE)
(NO LOAD)
0.1 F
INPUT
Figure 21. AD8014 as a Photodiode Preamp
INPUT
DIV
1
2
OUTPUT
500mV/DIV
CH1 20.0V
CH2 500mV M 25.0ns CH4 380mV
TEK RUN: 2.0GS/s ET AVERAGE
T[
]
Figure 22. Pulse Response
Figure 19. Large Signal Step Response; VS = ±5 V,
VO = 4 V Step
Figure 20. Large Signal Step Response; VS = +5 V,
VO = 2 V Step
Rev. C
20V/
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