Filters. MAX7404 Datasheet

MAX7404 Datasheet PDF


Part

MAX7404

Description

8th-Order / Lowpass / Elliptic / Switched-Capacitor Filters

Manufacture

Maxim

Page 12 Pages
Datasheet
Download MAX7404 Datasheet


MAX7404 Datasheet
19-4764; Rev 2; 6/99
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
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.
ADC Anti-Aliasing
Post-DAC Filtering
CT2 Base Stations
Applications
Speech Processing
Air-Bag Electronics
Typical Operating Circuit
VSUPPLY
0.1µF
INPUT
CLOCK
VDD SHDN
IN OUT
MAX7400
MAX7403
CLK
MAX7404
MAX7407
COM
OS
GND
OUTPUT
0.1µF
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
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX7400CSA
0°C to +70°C
8 SO
MAX7400CPA
0°C to +70°C
8 Plastic DIP
MAX7400ESA
-40°C to +85°C
8 SO
MAX7400EPA
-40°C to +85°C
8 Plastic DIP
Ordering Information continued at end of data sheet.
Selector Guide
PART
MAX7400
MAX7403
MAX7404
MAX7407
FILTER RESPONSE
Elliptic (r = 1.5)
Elliptic (r = 1.2)
Elliptic (r = 1.5)
Elliptic (r = 1.2)
OPERATING
VOLTAGE (V)
+5
+5
+3
+3
TOP VIEW
Pin Configuration
COM 1
IN 2
GND 3
VDD 4
MAX7400
MAX7403
MAX7404
MAX7407
8 CLK
7 SHDN
6 OS
5 OUT
SO/DIP
________________________________________________________________ Maxim Integrated Products 1
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.

MAX7404 Datasheet
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ABSOLUTE MAXIMUM RATINGS
VDD to GND
MAX7400/MAX7403 ..............................................-0.3V to +6V
MAX7404/MAX7407 ..............................................-0.3V to +4V
IN, OUT, COM, OS, CLK ............................-0.3V to (VDD + 0.3V)
SHDN........................................................................-0.3V to +6V
OUT Short-Circuit Duration...................................................1sec
Continuous Power Dissipation (TA = +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
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.
ELECTRICAL CHARACTERISTICS—MAX7400/MAX7403
(VDD = +5V, filter output measured at OUT, 10k|| 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to GND,
fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at +25°C.)
PARAMETER
FILTER CHARACTERISTICS
Corner Frequency
Clock-to-Corner Ratio
Clock-to-Corner Tempco
Output Voltage Range
Output Offset Voltage
DC Insertion Gain with
Output Offset Removed
Total Harmonic Distortion
plus Noise
OS Voltage Gain to OUT
Input Voltage Range at OS
COM Voltage Range
Input Resistance at COM
Clock Feedthrough
Resistive Output Load Drive
Maximum Capacitive Load
at OUT
Input Leakage Current at COM
Input Leakage Current at OS
CLOCK
Internal Oscillator Frequency
Clock Input Current
Clock Input High
Clock Input Low
SYMBOL
fC
fCLK/fC
(Note 1)
CONDITIONS
VOFFSET VIN = VCOM = VDD / 2
VCOM = VDD / 2 (Note 2)
THD+N
AOS
VOS
fIN = 200Hz, VIN = 4Vp-p,
MAX7400
measurement bandwidth = 22kHz MAX7403
VCOM
Input, COM externally driven
Output, COM internally biased
RCOM
RL
CL
SHDN = GND, VCOM = 0 to VDD
VOS = 0 to (VDD - 1V) (Note 3)
fOSC
ICLK
VIH
VIL
COSC = 1000pF (Note 4)
VCLK = 0 or 5V
MIN TYP MAX UNITS
0.001 to 10
kHz
100:1
10 ppm/°C
0.25
VDD - 0.25 V
±5 ±25 mV
-0.1 0.15
0.3
dB
-82
-80
1
VCOM ±0.1
VDD / 2
- 0.5
VDD / 2
VDD / 2
+ 0.5
VDD / 2
- 0.2
VDD / 2
VDD / 2
+ 0.2
75 125
10
10 1
dB
V/V
V
V
k
mVp-p
k
50 500
pF
±0.1
±0.1
±10
±10
µA
µA
29 38 48 kHz
±15 ±30 µA
VDD - 0.5
V
0.5 V
2 _______________________________________________________________________________________


Features Datasheet pdf 19-4764; Rev 2; 6/99 8th-Order, Lowpass , Elliptic, Switched-Capacitor Filters General Description The MAX7400/MAX7403 /MAX7404/MAX7407 8th-order, lowpass, el liptic, switched-capacitor filters (SCF s) operate from a single +5V (MAX7400/M AX7403) or +3V (MAX7404/MAX7407) supply . These devices draw 2mA of supply curr ent and allow corner frequencies from 1 Hz to 10kHz, making them ideal for low- power antialiasing and post-DAC filteri ng applications. They feature a shutdow n mode that reduces the supply current to 0.2µA. Two clocking options are ava ilable: self-clocking (through the use of an external capacitor) or external c locking for tighter cutoff-frequency co ntrol. In addition, an offset adjustmen t pin (OS) allows for the adjustment of the DC output level. The MAX7400/MAX74 04 provide 82dB of stopband rejection a nd a sharp rolloff with a transition ra tio of 1.5. The MAX7403/MAX7407 provide a sharper rolloff with a transition ra tio of 1.2, while still delivering 60dB of stopband rejection. T.
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