19-4764; Rev 2; 6/99
8 t h -Ord e r, Lo w p a s s , Ellip t ic ,
S w it c h e d -Ca p a c it o r Filt e rs
3/MAX407
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX7400/MAX7403/MAX7404/MAX7407 8th-order,
lowpass, elliptic, switched-capacitor filters (SCFs) oper-
ate from a single +5V (MAX7400/MAX7403) or +3V
(MAX7404/MAX7407) supply. These devices draw 2mA
of supply current and allow corner frequencies from
1Hz to 10kHz, making them ideal for low-power anti-
aliasing and post-DAC filtering applications. They fea-
ture a shutdown mode that reduces the supply current
to 0.2µA.
♦ 8th-Order Lowpass Elliptic Filter
♦ Low Noise and Distortion
-82dB THD + Noise (MAX7400)
♦ Clock-Tunable Corner Frequency (1Hz to 10kHz)
♦ 100:1 Clock-to-Corner Ratio
♦ Single-Supply Operation
+5V (MAX7400/MAX7403)
+3V (MAX7404/MAX7407)
Two c loc king op tions a re a va ila b le : s e lf-c loc king
(through the use of an external capacitor) or external
clocking for tighter cutoff-frequency control. In addition,
an offset adjustment pin (OS) allows for the adjustment
of the DC output level.
♦ Low Power
2mA (Operating Mode)
0.2µA (Shutdown Mode)
♦ Available in 8-Pin SO and DIP Packages
♦ Low Output Offset: ±5mV
The MAX7400/MAX7404 provide 82dB of stopband
rejection and a sharp rolloff with a transition ratio of 1.5.
The MAX7403/MAX7407 provide a sharper rolloff with a
transition ratio of 1.2, while still delivering 60dB of stop-
band rejection. The fixed response of these devices
simplifies the design task to corner-frequency selection
Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 SO
MAX7400CSA
MAX7400CPA
MAX7400ESA
MAX7400EPA
b y s e tting
a c loc k fre q ue nc y. The MAX7400/
0°C to +70°C
8 Plastic DIP
8 SO
MAX7403/MAX7404/MAX7407 are available in 8-pin SO
and DIP packages.
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
Ap p lic a t io n s
Ordering Information continued at end of data sheet.
ADC Anti-Aliasing
Post-DAC Filtering
CT2 Base Stations
Speech Processing
S e le c t o r Gu id e
Air-Bag Electronics
OPERATING
VOLTAGE (V)
PART
FILTER RESPONSE
MAX7400
MAX7403
MAX7404
MAX7407
Elliptic (r = 1.5)
Elliptic (r = 1.2)
Elliptic (r = 1.5)
Elliptic (r = 1.2)
+5
+5
+3
+3
Typ ic a l Op e ra t in g Circ u it
V
SUPPLY
P in Co n fig u ra t io n
0.1µF
V
DD
SHDN
OUT
TOP VIEW
INPUT
IN
OUTPUT
COM
IN
1
2
3
4
8
7
6
5
CLK
SHDN
OS
MAX7400
MAX7403
MAX7404
MAX7407
MAX7400
MAX7403
MAX7404
MAX7407
CLOCK
CLK
COM
OS
GND
0.1µF
V
DD
OUT
GND
SO/DIP
________________________________________________________________ Maxim Integrated Products
1
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