Rainbow Electronics MAX7480 - Manual

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General Description
The MAX7480 8th-order, lowpass, Butterworth,
switched-capacitor filter (SCF) operates from a single
+5V supply. The device draws only 2.9mA of supply
current and allows corner frequencies from 1Hz to
2kHz, making it ideal for low-power post-DAC filtering
and anti-aliasing applications. The MAX7480 features a
shutdown mode, which 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 corner-frequency control. An offset
adjust pin allows for adjustment of the DC output level.
The MAX7480 Butterworth filter provides a maximally
flat passband response. The fixed response simplifies
the design task to selecting a clock frequency.
Applications
ADC Anti-Aliasing
Post-DAC Filtering
Features
♦ 8th-Order, Lowpass Butterworth Filter
♦ Low Noise and Distortion: -73dB THD + Noise
♦ Clock-Tunable Corner Frequency (1Hz to 2kHz)
♦ 100:1 Clock-to-Corner Ratio
♦ +5V Single-Supply Operation
♦ Low Power
2.9mA (Operating Mode)
0.2µA (Shutdown Mode)
♦ Available in 8-Pin SO/DIP Package
♦ Low Output Offset: ±5mV
MAX7480
8th-Order, Lowpass, Butterworth,
Switched-Capacitor Filter
________________________________________________________________ Maxim Integrated Products 1
OS
OUT V DD
1
2
8
7
CLK
SHDN IN
GND
COM
SO/DIP
TOP VIEW
3
4
6
5
MAX7480
V DD
IN
CLK
OUT
GND
INPUT
0.1 µ F
0.1 µ F
CLOCK
SHDN
OUTPUT
V SUPPLY
COM
OS
MAX7480
Typical Operating Circuit
19-1416; Rev 0; 1/99
Pin Configuration
Ordering Information
PART
MAX7480ESA
MAX7480EPA -40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
8 SO
8 Plastic DIP