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| 型號： | AD8004ARZ-14-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/17頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF QUAD LP LDIST 14SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 4 |
| 轉(zhuǎn)換速率： | 3000 V/µs |
| -3db帶寬： | 250MHz |
| 電流 - 輸入偏壓： | 40µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 14mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 12 V，±2 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
REV. C
AD8004
–9–
THEORY OF OPERATION
The AD8004 is a member of a new family of high speed current-
feedback (CF) amplifiers offering new levels of bandwidth,
distortion, and signal-swing capability vs. power. Its wide dynamic
range capabilities are due to both a complementary high speed
bipolar process and a new design architecture. The AD8004 is
basically a two stage (Figure 30) rather than the conventional
one stage design. Both stages feature the current-on-demand
property associated with current feedback amplifiers. This
gives an unprecedented ratio of quiescent current to dynamic
performance. The important properties of slew rate and full
power bandwidth benefit from this performance. In addition
the second gain stage buffers the effects of load impedance,
significantly reducing distortion.
A full discussion of this new amplifier architecture is available on
the data sheet for the AD8011. This discussion only covers the
basic principles of operation.
DC AND AC CHARACTERISTICS
As with traditional op amp circuits the dc closed-loop gain is
defined as:
A
V = G = 1 +
R
F
R
N
noninverting operation
A
V = G =
R
F
R
N
inverting operation
The more exact relationships that take into account open-loop
gain errors are:
A
V =
G
1
+
1
G
A
O ( s )
+
R
F
T
O ( s )
for inverting (G is negative)
A
V =
G
1
+
G
A
O ( s )
+
R
F
T
O ( s )
for noninverting (G is positive)
In these equations the open-loop voltage gain (AO(s)) is common
to both voltage and current-feedback amplifiers and is the ratio
of output voltage to differential input voltage. The open-loop
transimpedance gain (TO(s)) is the ratio of output voltage to
inverting input current and is applicable to current-feedback
amplifiers. The open-loop voltage gain and open-loop transim-
pedance gain (TO(s)) of the AD8004 are plotted vs. frequency
in TPCs 15 and 18. These plots and the basic relationships can
be used to predict the first order performance of the AD8004 over
frequency. At low closed-loop gains the term (RF/TO(s)) dominates
the frequency response characteristics. This gives the result that
bandwidth is constant with gain, a familiar property of current
feedback amplifiers.
An RF of 1 k
has been chosen as the nominal value to give
optimum frequency response with acceptable peaking at gains of
+2/–1. As can be seen from the above relationships, at higher
closed-loop gains reducing RF has the effect of increasing closed-
loop bandwidth. Table I gives optimum values for RF and RG
for a variety of gains.
VP
Q1
Q2
IPP
IPN
INP
IPN
VN
ZI
IQ1
Q3
Q4
IE
CP1
A2
CL
RG
RF
VO
CD
ICQ + IO
VO
IQ1
AD8004
A2
CP2
CD
A3
RL
A1
Z2
Figure 5. Simplified Block Diagram
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