Rainbow Electronics MAX7415 - Manual (Page 5)

MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
_______________________________________________________________________________________ 5
ELLIPTIC FILTER (r = 1.25) CHARACTERISTICS—MAX7411/MAX7415
(V DD = +5V for MAX7411, V DD = +3V for MAX7415; filter output measured at OUT; 10k
Ω || 50pF load to GND at OUT; SHDN = V DD,
V COM = V OS = V DD / 2; f CLK = 100kHz; T A = T MIN to T MAX ; unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)
Note 1: The maximum f C is defined as the clock frequency f CLK = 100 · f C at which the peak SINAD drops to 68dB with a sinusoidal
input at 0.2f C .
Note 2: DC insertion gain is defined as ∆ V OUT / ∆ V IN .
Note 3: f OSC (kHz)
≈
27 · 10 3 / C OSC (C OSC in pF).
Note 4: The input frequencies, f IN , are selected at the peaks and troughs of the ideal elliptic frequency responses.
f IN = 0.68f C
f IN = 0.38f C
f IN = 3.25f C
f IN = 1.43f C
f IN = 1.25f C
f IN = 0.87f C
f IN = 0.97f C
f IN = f C
CONDITIONS
-0.4 0.2 0.4
dB
-0.4 -0.2 0.4
Insertion Gain
with DC Gain Error Removed
(Note 4)
-37.2 -35
-37.2 -35
-38.5 -34
-0.4 -0.2 0.4
-0.4 0.2 0.4
-0.7 -0.2 0.2
UNITS MIN TYP MAX PARAMETER
-120
-100
-80
-20
0
-40
-60
20
0 1 2 3 4 5
MAX7408/MAX7412
FREQUENCY RESPONSE
MAX7408/11-01
INPUT FREQUENCY (kHz)
GAIN (dB)
f C = 1kHz
r = 1.6
-120
-100
-80
-20
0
-40
-60
20
0 1 2 3 4 5
MAX7411/MAX7415
FREQUENCY RESPONSE
MAX7408/11-02
INPUT FREQUENCY (kHz)
GAIN (dB)
f C = 1kHz
r = 1.25
-1.2
-1.0
-0.8
-0.2
0
-0.4
-0.6
0.2
0 204 408 612 816 1.02k
MAX7408/MAX7412
PASSBAND FREQUENCY RESPONSE
MAX7408/11-03
INPUT FREQUENCY (Hz)
GAIN (dB)
f C = 1kHz
r = 1.6
Typical Operating Characteristics
(V
DD
= +5V for MAX7408/MAX7411, V
DD
= +3V for MAX7412/MAX7415; f CLK = 100kHz; SHDN = V
DD
; V COM = V OS = V
DD
/ 2;
T A = +25°C; unless otherwise noted.)