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參數(shù)資料
| 型號： | AD8057ARZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP VF LN LP LDIST 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 放大器類型： | 電壓反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1150 V/µs |
| -3db帶寬： | 325MHz |
| 電流 - 輸入偏壓： | 500nA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 6mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 12 V，±1.5 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-SO |
| 包裝： | 帶卷 (TR) |
Data Sheet
AD8057/AD8058
APPLICATIONS INFORMATION
DRIVING CAPACITIVE LOADS
When driving a capacitive load, most op amps exhibit overshoot in
their pulse response. Figure 43 shows the relationship between
the capacitive load that results in 30% overshoot and the closed-
loop gain of an AD8058. It can be seen that, under the gain = +2
condition, the device is stable with capacitive loads of up to 69 pF.
In general, to minimize peaking or to ensure device stability for
larger values of capacitive loads, a small series resistor (RS) can
be added between the op amp output and the load capacitor
For the setup shown in Figure 44, the relationship between RS
CLOSED-LOOP GAIN
500
400
0
5
1
2
3
4
C
L
(
pF)
300
200
100
RS = 2.4
RS = 0
01064-
044
Figure 43. Capacitive Load Drive vs. Closed-Loop Gain
–2.5V
RG
RF
RS
CL
VIN = 200mV p-p
AD8058
0.1F
10F
0.1F
10F
+2.5V
VOUT
FET PROBE
01064-
045
Figure 44. Capacitive Load Drive Circuit
Table 4. Recommended Value for Resistors RS, RF, RG vs.
Capacitive Load, CL, Which Results in 30% Overshoot
Gain
RF
RG
CL (RS = 0 )
CL (RS = 2.4 )
1
100
11 pF
13 pF
2
100
51 pF
69 pF
3
100
50
104 pF
153 pF
4
100
33.2
186 pF
270 pF
5
100
25
245 pF
500 pF
10
100
11
870 pF
1580 pF
50ns/DIV
100mV
–100mV
200mV
–200mV
+OVERSHOOT
29.0%
100mV/DIV
01064-
046
Figure 45. Typical Pulse Response with CL = 65 pF, Gain = +2, and VS = ±2.5
VIDEO FILTER
Some composite video signals that are derived from a digital
source contain some clock feedthrough that can cause problems
with downstream circuitry. This clock feedthrough is usually at
27 MHz, which is a standard clock frequency for both NTSC
and PAL video systems. A filter that passes the video band and
rejects frequencies at 27 MHz can be used to remove these fre-
quencies from the video signal.
Figure 46 shows a circuit that uses an AD8057 to create a single
5 V supply, 3-pole Sallen-Key filter. This circuit uses a single RC
pole in front of a standard 2-pole active section. To shift the dc
operating point to midsupply, ac coupling is provided by R4, R5,
and C4.
2
3
0.1F
+
10F
AD8057
7
4
6
+5V
R4
10k
R5
10k
C4
0.1F
R3
49.9
R2
499
C1
100pF
R1
200
RF
1k
C2
680pF
C3
36pF
01064-
047
Figure 46. Low-Pass Filter for Video
Rev. E | Page 13 of 16
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