參數(shù)資料
型號(hào)： AD8375ACPZ-R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/24頁(yè)
文件大小： 0K
描述： IC AMP VGA DIFF ULDIST 24LFCSP
產(chǎn)品培訓(xùn)模塊： Differential Circuit Design Techniques for Communication Applications
標(biāo)準(zhǔn)包裝： 1
放大器類(lèi)型： 可變?cè)鲆?br>
電路數(shù)： 1
輸出類(lèi)型： 差分
轉(zhuǎn)換速率： 5000 V/µs
-3db帶寬： 630MHz
電流 - 輸入偏壓： 900nA
電流 - 電源： 125mA
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-VQ（4x4）
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 775 (CN2011-ZH PDF)
其它名稱(chēng)： AD8375ACPZ-R7DKR
AD8375
Data Sheet
Rev. A | Page 14 of 24
BROADBAND OPERATION
The AD8375 uses an open-collector output structure that
requires dc bias through an external bias network. Typically,
choke inductors are used to provide bias to the open-collector
outputs. Choke inductors work well at signal frequencies where
the impedance of the choke is substantially larger than the target
ac load impedance. In broadband applications, it may not be
possible to find large enough choke inductors that offer enough
reactance at the lowest frequency of interest while offering a
high enough self resonant frequency (SRF) to support the
maximum bandwidth available from the device. The circuit in
Figure 36 can be used when frequency response below 10 MHz
is desired. This circuit replaces the bias chokes with bias resistors.
The bias resistor has the disadvantage of a greater IR drop, and
requires a supply rail that is several volts above the local 5 V
supply used to power the device. Additionally, it is necessary
to account for the ac loading effect of the bias resistors when
designing the output interface. Whereas the gain of the AD8375
is load dependent, RL, in parallel with R1 + R2, should equal the
optimum 150 Ω target load impedance to provide the expected
ac performance depicted in the data sheet. Additionally, to
ensure good output balance and even-order distortion
performance, it is essential that R1 = R2.
5
0.1F
50
ETC1-1-13
37.5
5V
AD8375
SET TO
5V
R1
R2
VR
RL
A0 TO A4
06724-
037
Figure 36. Single-Ended Broadband Operation with Resistive Pull-Ups
Using the formula for R1 (Equation 1), the values of R1 = R2
that provide a total presented load impedance of 150 Ω can be
found. The required voltage applied to the bias resistors, VR,
can be found by using the VR formula (Equation 2).
150
75
×
=
L
R
R1
(1)
and
5
10
40
3 +
×
=
R1
VR
(2)
For example, in the extreme case where the load is assumed to
be high impedance, RL = ∞, the equation for R1 reduces to R1 =
75 Ω. Using the equation for VR, the applied voltage should be
VR = 8 V. The measured single-tone low frequency harmonic
distortion for a 2 V p-p output using 75 Ω resistive pull-ups is
provided in Figure 37.
–80
–82
–84
–86
–88
–90
–92
–94
–96
HARM
O
NI
C
DI
S
T
O
RT
IO
N
(
d
Bc)
0
5
10
15
20
FREQUENCY (MHz)
HD2
HD3
06724-
038
Figure 37. Harmonic Distortion vs. Frequency Using Resistive Pull-Ups
ADC INTERFACING
The AD8375 is a high output linearity variable gain amplifier
that is optimized for ADC interfacing. The output IP3 and noise
floor essentially remain constant vs. the 24 dB available gain
range. This is a valuable feature in a variable gain receiver where
it is desirable to maintain a constant instantaneous dynamic
range as the receiver gain is modified. The output noise density
is typically around 20 nV/√Hz, which is comparable to 14-/16-
bit sensitivity limits. The two-tone IP3 performance of the
AD8375 is typically around 50 dBm. This results in SFDR levels
of better than 86 dB when driving the AD9445 up to 140 MHz.
There are several options available to the designer when using
the AD8375. The open-collector output provides the capability
of driving a variety of loads. Figure 38 shows a simplified
wideband interface with the AD8375 driving a AD9445. The
AD9445 is a 14-bit 125 MSPS analog-to-digital converter with a
buffered wideband input, which presents a 2 kΩ differential
load impedance and requires a 2 V p-p differential input swing
to reach full scale.
0.1F
50
ETC1-1-13
37.5
0.1F
82
1H
5V
1H
5V
33
14
AD9445
14-BIT ADC
AD8375
5
A0 TO A4
06724-
039
L
(SERIES)
L
(SERIES)
VIN+
VIN–
Figure 38. Wideband ADC Interfacing Example Featuring the AD9445
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