Datasheet

2 Maxim Integrated
Digitally-Programmed, Dual
2nd-Order Continuous Lowpass Filter
MAX270/MAX271
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
V+ to V- .................................................................-0.3V to +17V
V+ to GND ............................................................ -0.3V to +8.5V
V- to GND .............................................................. -0.3V to -8.5V
Input Voltage to GND, Any Input Pin ....(V- - 0.3V) to (V+ + 0.3V)
Duration of Output Short Circuit to GND ...................Continuous
Continuous Power Dissipation (T
A
= +70NC)
MAX270
PDIP (derate 11.1mW/NC above +70NC) .....................889mW
SO (W) (derate 10mW/NC above +70NC ......................800mW
MAX271
PDIP (derate 13.3mW/NC above +70NC) ...................1067mW
SO (W) (derate 11.7mW/NC above +70NC) .................. 941mw
Operating Temperature Ranges:
MAX27_C_ _ ....................................................... 0NC to +70NC
MAX27_E_ _ .................................................... -40NC to +85NC
Storage Temperature Range ............................ -65NC to +165NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow)
Lead(Pb)-free ...............................................................+260NC
Containing lead(Pb) .....................................................+240NC
ELECTRICAL CHARACTERISTICS
(V+ = +5V, V- = -5V; T
A
= +25NC, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FILTER CHARACTERISTICS
Operating Frequency Range (Note 1) 2 MHz
Programmed Cutoff Frequency (f
C
)
Range
1 to 25 kHz
Programmed Cutoff Frequency
Error
f
C
code = 53 (2.536kHz typ)
Q2.9
%
f
C
code = 127 (25kHz typ)
Q9.5
Filter Gain
f
C
code = 0 (1kHz typ),
T
A
= T
MIN
to T
MAX
f
IN
= 1kHz -3.6 -2.4
dB
f
IN
= 8kHz -33
f
C
code = 127 (25kHz typ),
T
A
= T
MIN
to T
MAX
f
IN
= 25kHz -6 -0.5
f
IN
= 200kHz -34
Maximum Gain (Peaking)
f
C
code = 0 (1kHz typ) 0.15
dB
f
C
code = 127 (25kHz typ) 0.15
Wideband Noise 50Hz to 50kHz bandwidth
f
C
code = 0
(1kHz typ)
12
FV
RMS
f
C
code = 127
(25kHz typ)
38
DC CHARACTERISTICS
DC Output Signal Swing
OUTA, OUTB, OP OUT (MAX270)
OUTA, OUTB, T/H OUT (MAX271)
R
LOAD
= 5kI, T
A
= T
MIN
to T
MAX
-3 +3 V
Offset Voltage at Outputs
OUTA, OUTB, OP OUT (MAX270)
OUTA, OUTB, T/H OUT (MAX271)
-2 +2 mV
DC Input Leakage Current
INA, INB (MAX270)
INA, INB (MAX271)
T
A
= T
MIN
to T
MAX
-1 +1
FA