參數(shù)資料
型號(hào)： MAX2101CMQ
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 消費(fèi)家電
英文描述： 16-Bit Buffers/Drivers With 3-State Outputs 48-TSSOP -40 to 85
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： METRIC, QFP-100
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 217K
代理商： MAX2101CMQ
The MAX2101 provides temperature-compensated bias
voltages that, when scaled and summed with the user-
supplied filter-control signal, provide the necessary
compensation for the filters. The filter-control signal can
originate in one of two forms: an analog current, or an
analog voltage. The temperature compensation signal
will be added to the control signal as discussed below.
Voltage Drive
A suggested technique of filter drive uses a voltage
source, such as a voltage output DAC. The tempera-
ture compensation signals, VPTAT and VREF, are shift-
ed and scaled, then summed with the control voltage,
and the sum is applied to the FTUNE inputs. See Figure
8 for a possible implementation.
The transfer function for Figure 8’s voltage drive config-
uration can be evaluated as follows:
R
R
TC
Thus, the user-supplied signal V
SET
, which is character-
ized by a very small (ideally 0) temperature coefficient,
will be summed with a small signal (
|
V
REF
- V
PTAT
|
≤
200mV) whose temperature dependence compensates
for the filter’s TC.
Current Drive
An alternate form of filter drive uses a current source,
such as a current-output DAC. The current is trans-
formed to the appropriate voltage via a transresistance
network, which will drive the FTUNE input(s). The tem-
perature compensation signals, VPTAT and VREF, are
shifted and scaled, transformed to current, added to
the user-supplied current, and the sum is transformed
back into the temperature compensated control voltage
(Figure 9).
Amplifier U1A generates a shifted reference signal,
V
TC
. V
TC
is transformed into a current through the
resistor R
TC
. R
TC
also scales this signal such that,
when compared to the feedback resistor R
F
, the proper
temperature dependence is added to the user-supplied
filter control current I
SET
to compensate for the TC of
the filter.
The expression for the final filter tune signal is
expressed as:
V
I
(R )
R
R
(V
V
)
FTUNE
SET
F
TC
REF
PTAT
=
+
V
V
R
R
(V
V
)
FTUNE
SET
F
TC
REF
PTAT
=
+
V
V
(V
V
)
TC
REF
F
REF
PTAT
=
+
M
6-Bit Quadrature Digitizer
______________________________________________________________________________________
13
2.00
1.70
0
140
FILTER CUTOFF FREQUENCY
TEMPERATURE DEPENDENCE
1.90
1.95
M
TEMPERATURE (
°
C)
F
60
1.80
1.75
20
40
100
1.85
80
120
f
C
= 15MHz
5
10
15
20
25
30
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
FTUNE (V)
FILTER CUTOFF FREQUENCY
vs. FTUNE
M
C
T
A
= +25°C
Figure 7. Typical Filter Cutoff Frequency Temperature
Dependence
Figure 6. Typical Filter Cutoff Frequency vs. FTUNE Input
Voltage
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