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Part Number MAX7403

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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.
Applications
ADC Anti-Aliasing
Speech Processing
Post-DAC Filtering
Air-Bag Electronics
CT2 Base Stations
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
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
________________________________________________________________
Maxim Integrated Products
1
V
DD
IN
CLK
OUT
GND
INPUT
0.1
µ
F
0.1
µ
F
CLOCK
SHDN
OUTPUT
V
SUPPLY
COM
OS
MAX7400
MAX7403
MAX7404
MAX7407
OS
OUT
V
DD
1
2
8
7
CLK
SHDN
IN
GND
COM
SO/DIP
TOP VIEW
3
4
6
5
MAX7400
MAX7403
MAX7404
MAX7407
Typical Operating Circuit
19-4764; Rev 2; 6/99
Ordering Information continued at end of data sheet.
Pin Configuration
Ordering Information
Selector Guide
MAX7407
Elliptic (r = 1.2)
+3
PART
FILTER RESPONSE
OPERATING
VOLTAGE (V)
MAX7403
MAX7400
Elliptic (r = 1.5)
+5
Elliptic (r = 1.2)
+5
MAX7404
Elliptic (r = 1.5)
+3
PART
MAX7400
CSA
MAX7400CPA
MAX7400ESA
-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
8 SO
8 Plastic DIP
8 SO
MAX7400EPA
-40°C to +85°C
8 Plastic DIP
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--MAX7400/MAX7403
(V
DD
= +5V, filter output measured at OUT, 10k
|| 50pF load to GND at OUT, SHDN = V
DD
, OS = COM, 0.1µF from COM to GND,
f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at +25°C.)
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
DD
to GND
MAX7400/MAX7403 ..............................................-0.3V to +6V
MAX7404/MAX7407 ..............................................-0.3V to +4V
IN, OUT, COM, OS, CLK ............................-0.3V to (V
DD
+ 0.3V)
SHDN........................................................................-0.3V to +6V
OUT Short-Circuit Duration...................................................1sec
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.88mW/°C above +70°C) ..........................471mW
DIP (derate 9.1mW/°C above +70°C) ...........................727mW
Operating Temperature Ranges
MAX740_C_A .....................................................0°C to +70°C
MAX740_E_A ..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
V
OS
= 0 to (V
DD
- 1V) (Note 3)
(Note 1)
SHDN = GND, V
COM
= 0 to V
DD
V
IN
= V
COM
= V
DD
/ 2
Output, COM internally biased
V
COM
= V
DD
/ 2 (Note 2)
Input, COM externally driven
CONDITIONS
µA
±0.1
±10
Input Leakage Current at OS
µA
±0.1
±10
Input Leakage Current at COM
pF
50
500
C
L
Maximum Capacitive Load
at OUT
k
10
1
R
L
Resistive Output Load Drive
mVp-p
10
Clock Feedthrough
k
75
125
R
COM
Input Resistance at COM
V
DD
/ 2
V
DD
/ 2
V
DD
/ 2
- 0.2
+ 0.2
V
COM
COM Voltage Range
V
V
DD
/ 2
V
DD
/ 2
V
DD
/ 2
- 0.5
+ 0.5
100:1
f
CLK
/f
C
Clock-to-Corner Ratio
kHz
0.001 to 10
f
C
Corner Frequency
V
V
COM
±0.1
V
OS
Input Voltage Range at OS
-82
ppm/°C
10
Clock-to-Corner Tempco
V
0.25
V
DD
- 0.25
Output Voltage Range
mV
±5
±25
V
OFFSET
Output Offset Voltage
dB
-0.1
0.15
0.3
DC Insertion Gain with
Output Offset Removed
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
C
OSC
= 1000pF (Note 4)
kHz
29
38
48
f
OSC
Internal Oscillator Frequency
V
CLK
= 0 or 5V
µA
±15
±30
I
CLK
Clock Input Current
V
DD
- 0.5
V
IH
V
0.5
V
IL
Clock Input High
f
IN
= 200Hz, V
IN
= 4Vp-p,
measurement bandwidth = 22kHz
dB
-80
THD+N
Total Harmonic Distortion
plus Noise
MAX7400
MAX7403
V/V
1
A
OS
OS Voltage Gain to OUT
Clock Input Low
V
FILTER CHARACTERISTICS
CLOCK
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--MAX7400/MAX7403 (continued)
(V
DD
= +5V, filter output measured at OUT, 10k
|| 50pF load to GND at OUT, SHDN = V
DD
, OS = COM, 0.1µF from COM to GND,
f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS--MAX7404/MAX7407
(V
DD
= +3V, filter output measured at OUT, 10k
|| 50pF load to GND at OUT, SHDN = V
DD
, OS = COM, 0.1µF from COM to GND,
f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
SHUTDOWN
POWER REQUIREMENTS
SHDN Input Leakage Current
±0.1
±10
µA
V
SHDN
= 0 to V
DD
SHDN Input High
V
SDL
0.5
V
V
SDH
V
DD
- 0.5
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Power-Supply Rejection Ratio
PSRR
60
dB
Shutdown Current
I
SHDN
0.2
1
µA
Supply Voltage
V
DD
4.5
5.5
V
Supply Current
I
DD
2
3.5
mA
CONDITIONS
Measured at DC
SHDN = GND, CLK driven from 0 to V
DD
Operating mode, no load, IN = OS = COM
FILTER CHARACTERISTICS
Total Harmonic Distortion
plus Noise
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
DC Insertion Gain with Output
Offset Removed
-0.1
0.1
0.3
dB
Output Offset Voltage
V
OFFSET
±5
±25
mV
Output Voltage Range
0.25
V
DD
- 0.25
V
Clock-to-Corner Tempco
10
ppm/°C
THD+N
-77
dB
MAX7407
MAX7404
-79
OS Voltage Gain to OUT
A
OS
1
V/V
Input Voltage Range at OS
V
OS
V
COM
±0.1
V
Corner Frequency
f
C
0.001 to 10
kHz
Clock-to-Corner Ratio
f
CLK
/f
C
100:1
V
DD
/ 2
V
DD
/ 2
V
DD
/ 2
- 0.1
+ 0.1
V
COM Voltage Range
V
COM
Input Resistance at COM
R
COM
75
125
k
Clock Feedthrough
10
mVp-p
Resistive Output Load Drive
R
L
10
1
k
Maximum Capacitive Load
at OUT
C
L
50
500
pF
Input Leakage Current at COM
±0.1
±10
µA
Input Leakage Current at OS
±0.1
±10
µA
CONDITIONS
COM internally biased or externally driven
V
COM
= V
DD
/ 2 (Note 2)
V
IN
= V
COM
= V
DD
/ 2
f
IN
= 200Hz, V
IN
= 2.5Vp-p,
measurement bandwidth = 22kHz
SHDN = GND, V
COM
= 0 to V
DD
(Note 1)
V
OS
= 0 to (V
DD
- 1V) (Note 3)
SHDN Input Low
V
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS--MAX7404/MAX7407 (continued)
(V
DD
= +3V, filter output measured at OUT, 10k
|| 50pF load to GND at OUT, SHDN = V
DD
, OS = COM, 0.1µF from COM to GND,
f
CLK
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
ELLIPTIC (r = 1.5) FILTER CHARACTERISTICS--MAX7400/MAX7404
(V
DD
= +5V for MAX7400, V
DD
= +3V for MAX7404; filter output measured at OUT; 10k
||
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.)
V
CLK
= 0 or 3V
C
OSC
= 1000pF (Note 4)
V
CONDITIONS
V
DD
- 0.5
V
IH
µA
±15
±30
I
CLK
Clock Input Current
kHz
26
34
43
f
OSC
Internal Oscillator Frequency
0.5
V
IL
Clock Input High
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
SHDN = GND, CLK driven from 0 to V
DD
Operating mode, no load, IN = OS = COM
Measured at DC
µA
0.2
1
I
SHDN
mA
2
3.5
I
DD
Supply Current
V
2.7
3.6
V
DD
Supply Voltage
60
PSRR
Shutdown Current
Power-Supply Rejection Ratio
dB
V
DD
- 0.5
V
SDH
SHDN Input High
V
V
S HDN
= 0 to V
DD
±0.1
±10
SHDN Input Leakage Current
µA
V
SDL
0.5
Clock Input Low
SHDN Input Low
V
V
CLOCK
POWER REQUIREMENTS
SHUTDOWN
dB
CONDITIONS
UNITS
MIN
TYP
MAX
PARAMETER
f
IN
= 0.371f
C
-0.20
-0.10
0.20
f
IN
= 0.737f
C
f
IN
= 0.587f
C
-0.20
-0.08
0.20
-0.20
0.02
0.20
f
IN
= 0.940f
C
f
IN
= 0.868f
C
-0.20
-0.03
0.20
f
IN
= 1.000f
C
f
IN
= 0.988f
C
-0.20
0.02
0.25
-0.20
0.09
0.25
-0.20
0.06
0.20
f
IN
= 1.601f
C
f
IN
= 1.500f
C
-84
-78
f
IN
= 4.020f
C
f
IN
= 2.020f
C
-85
-78
Insertion Gain Relative to DC Gain
(Note 5)
-83
-78
-82
-75
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
_______________________________________________________________________________________
5
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:
OS voltages above V
DD
- 1V saturate the input and result in a 75µA typical input leakage current.
Note 4:
For MAX7400/MAX7403, f
OSC
(kHz)
38
·
10
3
/ C
OSC
(pF). For MAX7404/MAX7407, f
OSC
(kHz)
34
·
10
3
/ C
OSC
(pF).
Note 5:
The input frequencies, f
IN
, are selected at the peaks and troughs of the frequency responses.
ELLIPTIC (r = 1.2) FILTER CHARACTERISTICS--MAX7403/MAX7407
(V
DD
= +5V for MAX7403, V
DD
= +3V for MAX7407; filter output measured at OUT; 10k
||
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.)
Typical Operating Characteristics
(V
DD
= +5V for MAX7400/MAX7403, V
DD
= +3V for MAX7404/MAX7407; V
COM
= V
OS
= V
DD
/ 2; SHDN = V
DD
; f
CLK
= 100kHz;
T
A
= +25°C; unless otherwise noted.)
-120
-80
-100
-40
-60
0
-20
20
0
1
2
3
4
5
MAX7400/MAX7404 (r = 1.5)
FREQUENCY RESPONSE
MAX7400/03-01
INPUT FREQUENCY (kHz)
GAIN (dB)
f
C
= 1kHz
-0.08
0
-0.04
0.12
0.08
0.04
0.20
0.16
0.24
0
202
404
606
808
1010
MAX7400/MAX7404 (r = 1.5)
PASSBAND FREQUENCY RESPONSE
MAX7400/03-02
INPUT FREQUENCY (Hz)
GAIN (dB)
f
C
= 1kHz
-640
-480
-560
-240
-320
-400
-80
-160
0
0
300
600
900
1200
1500
MAX7400/MAX7404 (r = 1.5)
PHASE RESPONSE
MAX7400/03-03
INPUT FREQUENCY (Hz)
PHASE SHIFT (DEGREES)
f
C
= 1kHz
PARAMETER
MIN
TYP
MAX
UNITS
-58
-50
-60
-54
Insertion Gain Relative to DC Gain
(Note 5)
-60
-54
f
IN
= 1.533f
C
dB
f
IN
= 2.875f
C
-59
-54
f
IN
= 1.200f
C
f
IN
= 1.261f
C
-0.20
0.10
0.20
-0.20
0.14
0.30
CONDITIONS
-0.20
0.09
0.30
f
IN
= 0.992f
C
f
IN
= 1.000f
C
-0.20
0.02
0.20
f
IN
= 0.902f
C
f
IN
= 0.956f
C
-0.20
0.02
0.20
-0.20
-0.06
0.20
f
IN
= 0.640f
C
f
IN
= 0.784f
C
-0.20
-0.11
0.20
f
IN
= 0.408f
C
MAX7400/MAX7403/MAX7404/MAX7407