MAX7413 Maxim, MAX7413 Datasheet - Page 7

• Manufacturer Part Number: MAX7413
• Description: 5th-Order / Lowpass / Switched-Capacitor Filters
• Manufacturer: Maxim

The MAX7409/MAX7413 Bessel filters provide low over-
shoot and fast settling responses, and the MAX7410/
MAX7414 Butterworth filters provide a maximally flat
passband response. All parts operate with a 100:1
clock-to-corner frequency ratio and a 15kHz maximum
corner frequency.
Lowpass Bessel filters such as the MAX7409/MAX7413
delay all frequency components equally, preserving the
shape of step inputs (subject to the attenuation of the
_______________Detailed Description
(V
unless otherwise noted.)
DD
PIN
1
2
3
4
5
6
7
8
= +5V for MAX7409/MAX7410, V
-3.00
-3.25
-3.50
-3.75
-4.00
-4.25
-4.50
NAME
SHDN
COM
GND
OUT
CLK
V
OS
IN
DD
-40
-20
_______________________________________________________________________________________
OUTPUT OFFSET VOLTAGE
Common Input Pin. Biased internally at midsupply. Bypass COM externally to GND with a 0.1µF capacitor.
To override internal biasing, drive COM with an external supply.
Filter Input
Ground
Positive Supply Input: +5V for MAX7409/MAX7410, +3V for MAX7413/MAX7414.
Filter Output
Offset Adjust Input. To adjust output offset, connect OS to an external supply through a resistive voltage-
divider (Figure 3). Connect OS to COM if no offset adjustment is needed. Refer to the
Mode Input Adjustment section.
Shutdown Input. Drive low to enable shutdown mode; drive high or connect to V
Clock Input. Connect an external capacitor (C
To override the internal oscillator, connect CLK to an external clock: f
vs. TEMPERATURE
0
TEMPERATURE (°C)
Bessel Characteristics
V
20
DD
= +5V
40
DD
60
= +3V for MAX7413/MAX7414, f
V
DD
80
= +3V
Typical Operating Characteristics (continued)
100
Switched-Capacitor Filters
OSC
higher frequencies). Bessel filters settle quickly—an
important characteristic in applications that use a multi-
plexer (mux) to select an input signal for an analog-to-
digital converter (ADC). An anti-aliasing filter placed
between the mux and the ADC must settle quickly after
a new channel is selected.
Lowpass Butterworth filters such as the MAX7410/
MAX7414 provide a maximally flat passband response,
making them ideal for instrumentation applications that
require minimum deviation from the DC gain throughout
the passband.
CLK
FUNCTION
) from CLK to ground: f
= 100kHz, SHDN = V
5th-Order, Lowpass,
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
2.5
Butterworth Characteristics
3.0
OUTPUT OFFSET VOLTAGE
C
vs. SUPPLY VOLTAGE
= f
DD
SUPPLY VOLTAGE (V)
OSC
3.5
CLK
, COM = OS = V
(kHz) = 30 x 10
/100.
4.0
DD
Pin Description
for normal operation.
4.5
Offset and Common-
5.0
DD
3
/ 2, T
/ C
5.5
OSC
A
= +25°C,
(pF).
7