MAX7400 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

19-4764; Rev 2; 6/99
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
General Description
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.
Two clocking options are available: self-clocking
(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.
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
by setting a clock frequency. The MAX7400/
MAX7403/MAX7404/MAX7407 are available in 8-pin SO
and DIP packages.
ADC Anti-Aliasing
Post-DAC Filtering
CT2 Base Stations
Applications
Speech Processing
Air-Bag Electronics
Typical Operating Circuit
V_SUPPLY
0.1µF
INPUT
CLOCK
V_DD
SHDN
IN
OUT
MAX7400
MAX7403
CLK
MAX7404
MAX7407
COM
OS
GND
OUTPUT
0.1µF
Features
o 8th-Order Lowpass Elliptic Filter
o Low Noise and Distortion
-82dB THD + Noise (MAX7400)
o Clock-Tunable Corner Frequency (1Hz to 10kHz)
o 100:1 Clock-to-Corner Ratio
o Single-Supply Operation
+5V (MAX7400/MAX7403)
+3V (MAX7404/MAX7407)
o Low Power
2mA (Operating Mode)
0.2µA (Shutdown Mode)
o Available in 8-Pin SO and DIP Packages
o Low Output Offset: ±5mV
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX7400CSA
0°C to +70°C
8 SO
MAX7400CPA
0°C to +70°C
8 Plastic DIP
MAX7400ESA
-40°C to +85°C
8 SO
MAX7400EPA
-40°C to +85°C
8 Plastic DIP
Ordering Information continued at end of data sheet.
Selector Guide
PART
MAX7400
MAX7403
MAX7404
MAX7407
FILTER RESPONSE
Elliptic (r = 1.5)
Elliptic (r = 1.2)
Elliptic (r = 1.5)
Elliptic (r = 1.2)
OPERATING
VOLTAGE (V)
+5
+5
+3
+3
TOP VIEW
Pin Configuration
COM 1
IN 2
GND 3
V_DD 4
MAX7400
MAX7403
MAX7404
MAX7407
8 CLK
7 SHDN
6 OS
5 OUT
SO/DIP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].