数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

AD8137YCPZ-R2 数据表(PDF) 24 Page - Aavid, Thermal Division of Boyd Corporation

部件名 AD8137YCPZ-R2
功能描述  Low Cost, Low Power, Differential ADC Driver
PDF  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AAVID [Aavid, Thermal Division of Boyd Corporation]
网页  https://www.boydcorp.com/aavid.html
标志 AAVID - Aavid, Thermal Division of Boyd Corporation

AD8137YCPZ-R2 数据表(HTML) 24 Page - Aavid, Thermal Division of Boyd Corporation

Back Button AD8137YCPZ-R2 Datasheet HTML 20Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 21Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 22Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 23Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 24Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 25Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 26Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 27Page - Aavid, Thermal Division of Boyd Corporation AD8137YCPZ-R2 Datasheet HTML 28Page - Aavid, Thermal Division of Boyd Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 24 / 32 page
background image
AD8137
Data Sheet
Rev. E | Page 24 of 32
The differential output voltage noise contains contributions
from the AD8137’s input voltage noise and input current noise
as well as those from the external feedback networks.
The contribution from the input voltage noise spectral density
is computed as
 +
=
G
F
n
R
R
v
Vo_n
1
1
, or equivalently, vn/β
(7)
where vn is defined as the input-referred differential voltage
noise. This equation is the same as that of traditional op amps.
The contribution from the input current noise of each input is
computed as
( )
F
n R
i
Vo_n =
2
(8)
where in is defined as the input noise current of one input. Each
input needs to be treated separately because the two input currents
are statistically independent processes.
The contribution from each RG is computed as
=
G
F
G
R
R
TR
Vo_n
k
4
3
(9)
This result can be intuitively viewed as the thermal noise of
each RG multiplied by the magnitude of the differential gain.
The contribution from each RF is computed as
F
TR
Vo_n
k
4
4 =
(10)
Voltage Gain
The behavior of the node voltages of the single-ended-to-
differential output topology can be deduced from the signal
definitions and Figure 64. Referring to Figure 64, CF = 0 and
setting VIN = 0, one can write:
F
ON
AP
G
AP
IP
R
V
V
R
V
V
−
=
−
(11)
+
=
=
G
F
G
OP
AP
AN
R
R
R
V
V
V
(12)
Solving the previous two equations and setting VIP to Vi gives
the gain relationship for VO, dm/Vi.
i
G
F
dm
O,
ON
OP
V
R
R
V
V
V
=
=
−
(13)
An inverting configuration with the same gain magnitude can
be implemented by simply applying the input signal to VIN and
setting VIP = 0. For a balanced differential input, the gain from
VIN, dm to VO, dm is also equal to RF/RG, where VIN, dm = VIP − VIN.
Feedback Factor Notation
When working with differential drivers, it is convenient to
introduce the feedback factor β, which is defined as
G
F
G
R
R
R
+
≡
β
(14)
This notation is consistent with conventional feedback analysis
and is very useful, particularly when the two feedback loops are
not matched.
Input Common-Mode Voltage
The linear range of the VAN and VAP terminals extends to within
approximately 1 V of either supply rail. Because VAN and VAP are
essentially equal to each other, they are both equal to the amplifier’s
input common-mode voltage. Their range is indicated in the
specifications tables as input common-mode range. The voltage
at VAN and VAP for the connection diagram in Figure 64 can be
expressed as
VAN = VAP = VACM =
(
)


×
+
+


+
×
+
OCM
G
F
G
IN
IP
G
F
F
V
R
R
R
V
V
R
R
R
2
(15)
where VACM is the common-mode voltage present at the amplifier
input terminals.
Using the β notation, Equation (15) can be written as
VACM = βVOCM + (1 − β)VICM
(16)
or equivalently,
VACM = VICM + β(VOCM − VICM)
(17)
where VICM is the common-mode voltage of the input signal,
that is
2
IN
IP
ICM
V
V
V
+
≡
For proper operation, the voltages at VAN and VAP must stay
within their respective linear ranges.
Calculating Input Impedance
The input impedance of the circuit in Figure 64 depends on
whether the amplifier is being driven by a single-ended or a
differential signal source. For balanced differential input
signals, the differential input impedance (RIN, dm) is simply
RIN, dm = 2RG
(18)
For a single-ended signal (for example, when VIN is grounded
and the input signal drives VIP), the input impedance becomes
)
(
2
1
F
G
F
G
IN
R
R
R
R
R
+
−
=
(19)



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com