Datasheet

MAX7401/MAX7405
8th-Order, Lowpass, Bessel,
Switched-Capacitor Filters
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
DD
= +5V for MAX7401, V
DD
= +3V for MAX7405; f
CLK
= 100kHz; SHDN = V
DD
; V
COM
= V
OS
= V
DD
/ 2; T
A
= +25°C; unless otherwise
noted.)
0.96
0.98
0.97
1.00
0.99
1.03
1.02
1.01
1.04
-40 0-20 20 40 60 80 100
NORMALIZED OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX7401 toc10
TEMPERATURE (°C)
NORMALIZED OSCILLATOR FREQUENCY
C
OSC
= 390pF
MAX7405
MAX7401
-90
-70
-80
-50
-60
-40
-30
-10
-20
0
012
A
B
345
MAX7401
THD PLUS NOISE vs.
INPUT SIGNAL AMPLITUDE
MAX7401 toc11
AMPLITUDE (Vp-p)
THD + NOISE (dB)
NO LOAD
(SEE TABLE A)
-90
-70
-80
-50
-60
-40
-30
-10
-20
0
012345
MAX7401
THD PLUS NOISE vs. INPUT SIGNAL
AMPLITUDE AND RESISTIVE LOAD
MAX7401 toc12
AMPLITUDE (Vp-p)
THD + NOISE (dB)
R
L
= 500Ω
R
L
= 1kΩ
R
L
= 10kΩ
f
IN
= 200Hz
f
C
= 1kHz
MEASUREMENT BW = 22kHz
TRACE
f
IN
(Hz)
f
C
(kHz)
A 1000 5
B 200 1
f
CLK
(kHz)
500
100
MEASUREMENT
BANDWIDTH (kHz)
80
22
Table A. THD Plus Noise vs. Input
Signal Amplitude Test Conditions
-90
-70
-80
-40
-50
-60
-10
-20
-30
0
0 1.00.5 1.5 2.0 2.5 3.0
MAX7405
THD PLUS NOISE vs.
INPUT SIGNAL AMPLITUDE
MAX7401 toc13
AMPLITUDE (Vp-p)
THD + NOISE (dB)
B
NO LOAD
(SEE TABLE A)
A
-90
-70
-80
-40
-50
-60
-10
-20
-30
0
0 1.00.5 1.5 2.0 2.5 3.0
MAX7405
THD PLUS NOISE vs. INPUT SIGNAL
AMPLITUDE AND RESISTIVE LOAD
MAX7401 toc14
AMPLITUDE (Vp-p)
THD + NOISE (dB)
f
IN
= 200Hz
f
C
= 1kHz
MEASUREMENT BW = 22kHz
R
L
= 500Ω
R
L
= 1kΩ
R
L
= 10kΩ