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參數(shù)資料
| 型號(hào)： | MAX2100 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadrature Digitizer Circuits(正交數(shù)字轉(zhuǎn)換器電路) |
| 中文描述： | 正交數(shù)字轉(zhuǎn)換電路（正交數(shù)字轉(zhuǎn)換器電路） |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 72K |
| 代理商： | MAX2100 |
M
Ac tive Lowpass Filter
6
_______________________________________________________________________________________
____________________________Features
o
5-Pole Butterworth Response
o
Adjustable Cutoff Frequency
o
No External Components Required
_________________________Desc ription
The X2114 cell is an Active Lowpass Filter for anti-alias-
ing. The 5th-order Butterworth response is realized
using a Gyrator topology. Cutoff frequency can be
adjusted from 10MHz to 30MHz. Other pole-only filter
characteristics, as well as different cutoff frequency
ranges, can be designed by changing capacitor val-
ues.
Filter cutoff-frequency control requires a linear PTAT
voltage between 1V and 4V (at +27°C). An on-chip ref-
erence generator provides the necessary voltage varia-
tion with temperature.
Cell Dimensions: 620 x 780 + 260 x 520μm
VTUNE
INPUT
OUTPUT
X2114
X2114 LOWPASS
ACTIVE FILTER
KEY ELECTRICAL CHARACTERISTICS
(T
A
= 0°C to +70°C, unless otherwise noted.)
_____________________Bloc k Diagram
PORT LIST
f = 5MHz, R
S
= 50
nV/
√
Hz
58
VTUNE = 1V, 3dB, T
A
= +25°C
VTUNE = 4V, 3dB, T
A
= +25°C
f = 5MHz
e
n
Equivalent Input Noise
VTUNE = 2.1V, 3dB, T
A
= +25°C
f = 2 x f
C
(with respect to signal level at f = 0.5 x f
C
)
CONDITIONS
MHz
MHz
dB
10
f
CMIN
f
CMAX
APB
Minimum Cutoff
Maximum Cutoff
Passband Attenuation
MHz
16
24
f
C
Cutoff Frequency
mA
2.5
I
CC
Supply Current
30
0
2
dB
27
ASB
Stop-Band Attenuation
mV
30
V
IN
(max)
Maximum Input Signal, p-p
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Output reference
Output
Bandgap voltage in
(from X2112 or equivalent)
Ground
250μA PTAT reference current output for X2113
Tuning voltage input (PTAT)
+5V supply
DESCRIPTION
REF1
OP
REF
ADC
VTUNE
PORT NAME
250μA PTAT reference current input
(from X2112 or equivalent)
+ Input
- Input
Substrate connection (GND)
SUB
DESCRIPTION
V
EE
V
CC
BIAS
IP
IPB
PORT NAME
V
CC
= 5.0V ±5%
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