MAX7480ESA+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX7480ESA+ ,8th-Order, Lowpass, Butterworth, Switched-Capacitor FilterELECTRICAL CHARACTERISTICS(V = +5V, filter output measured at OUT, 10kΩ || 50pF load to GND at OUT, ..
MAX748ACPA ,3.3V, Step-Down, Current-Mode PWM DC-DC ConvertersGeneral Description ____________
MAX748ACPA ,3.3V, Step-Down, Current-Mode PWM DC-DC ConvertersFeaturesThe MAX748A/MAX763A are 3.3V-output CMOS, step- ' Up to 500mA Load Currentsdown switching r ..
MAX748ACPA+ ,3.3V, Step-Down, Current-Mode PWM DC-DC ConvertersFeaturesThe MAX748A/MAX763A are 3.3V-output CMOS, step- ♦ Up to 500mA Load Currentsdown switching r ..
MAX748ACWE ,3.3V, Step-Down, Current-Mode PWM DC-DC ConvertersMAX748A/MAX763A19-0190; Rev 0; 9/933.3V, Step-Down,Current-Mode PWM DC-DC Converters_______________ ..
MAX748AEPA ,3.3V, Step-Down, Current-Mode PWM DC-DC ConvertersELECTRICAL CHARACTERISTICS(Circuit of Figure 3, V+ = 5V, I = 0mA, T = T to T , unless otherwise not ..
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory
MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY

MAX7480ESA+
8th-Order, Lowpass, Butterworth, Switched-Capacitor Filter
neral DescriptionThe MAX7480 8th-order, lowpass, Butterworth,
switched-capacitor filter (SCF) operates from a single
+5V supply. The device draws only 2.9mA of supply
current and allows corner frequencies from 1Hz to
2kHz, making it ideal for low-power post-DAC filtering
and anti-aliasing applications. The MAX7480 features a
shutdown mode, which 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 corner-frequency control. An offset
adjust pin allows for adjustment of the DC output level.
The MAX7480 Butterworth filter provides a maximally
flat passband response. The fixed response simplifies
the design task to selecting a clock frequency.
Applications
ADC Anti-Aliasing
Post-DAC Filteringatures8th-Order, Lowpass Butterworth FilterLow Noise and Distortion: -73dB THD + NoiseClock-Tunable Corner Frequency (1Hz to 2kHz)100:1 Clock-to-Corner Ratio+5V Single-Supply OperationLow Power
2.9mA (Operating Mode)
0.2μA (Shutdown Mode)Available in 8-Pin SO/DIP PackageLow Output Offset: ±5mVth-Order, Lowpass, Butterwortitched-Capacitor Filte
OUTVDD
CLK
SHDNIN
GND
COM
SO/DIP
TOP VIEW
MAX7480
VDD
CLK
OUT
GND
INPUT
0.1μF
0.1μF
CLOCK
SHDN
OUTPUT
VSUPPLY
COM
MAX7480
Typical Operating Circuit
19-1416; Rev 0; 1/99
Pin Configuration
Ordering Information
PART
MAX7480ESA
MAX7480EPA-40°C to +85°C
-40°C to +85°C
TEMP. RANGEPIN-PACKAGE
8 SO
8 Plastic DIP
th-Order, Lowpass, Butterworth,itched-Capacitor FilterABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= +5V, filter output measured at OUT, 10kΩ|| 50pF load to GND at OUT, OS = COM, 0.1μF from COM to GND, SHDN=
VDD, fCLK= 100kHz, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +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.
VDDto GND..............................................................-0.3V to +6V
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)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin DIP (derate 9.09mW/°C above +70°C)...............727mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
COSC= 1000pF (Note 4)
VOS= 0 to (VDD- 1V) (Note 3)
SHDN= GND, VCOM= 0 to VDD
(Note 1)
Input, COM externally driven
fIN= 200Hz, VIN= 4Vp-p,
measurement bandwidth = 22kHz
VIN= VCOM= VDD / 2
VCOM= VDD / 2 (Note 2)
CONDITIONS5367fOSCInternal Oscillator Frequency
±0.1±10Input Leakage Current at OS
±0.1±10Input Leakage Current at COM500CL1RLResistive Output Load Drive Clock Feedthrough125RCOMInput Resistance at COM
100:1fCLK/fCClock-to-Corner Ratio
0.001 to 2fCCorner Frequency
VCOMAOSOS Voltage Gain to OUT
-73THD+NTotal Harmonic Distortion
plus NoiseClock-to-Corner Tempco
0.25VDD- 0.25Output Voltage Range±25VOFFSETOutput Offset Voltage
-0.10.150.3DC Insertion Gain with
Output Offset Removed
MINTYPMAXSYMBOLPARAMETER
VCLK= 0 or 5V
0.5VILClock Input Low
VDD - 0.5VIHClock Input High
±24±40ICLKClock Input Current
kHz
mVp-p
V/V
ppm/°C
kHz
UNITS
Maximum Capacitive Load at
OUT
COMVoltage Range
VDD / 2 VDD / 2VDD / 2
- 0.5+ 0.5
VCOM ±0.1VOSInput Voltage Range at OSV
VDD / 2 VDD / 2VDD / 2
- 0.2+ 0.2
FILTER CHARACTERISTICS
CLOCK
Output, COM internally biased
th-Order, Lowpass, Butterwortitched-Capacitor FilteELECTRICAL CHARACTERISTICS (continued)
(VDD= +5V, filter output measured at OUT, 10kΩ|| 50pF load to GND at OUT, OS = COM, 0.1μF from COM to GND, SHDN
VDD, fCLK= 100kHz, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
CONDITIONSMINTYPMAXSYMBOLPARAMETER
Measured at DC
SHDN= GND, CLK driven from 0 to VDD
Operating mode, no load, IN = OS = COM
0.5VSDLSHDNInput Low
VDD - 0.5VSDHSHDNInput HighPSRRPower-Supply Rejection Ratio
0.21ISHDNShutdown Current
2.93.5Supply CurrentIDD
4.55.5VDDSupply Voltage
UNITS
SHDNInput Leakage CurrentVSHDN= 0 to VDD±0.1±10μA
POWER REQUIREMENTS
SHUTDOWN
FILTER CHARACTERISTICS
(VDD= +5V, filter output measured at OUT, 10kΩ||50pF load to GND at OUT, SHDN= VDD, VCOM = VOS = VDD/2, fCLK= 100kHz, TA
= TMINto TMAX,unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:The maximum fCis defined as the clock frequency fCLK= 100 ·fCat which the peak SINAD drops to 68dB with a sinusoidal
input at 0.2fC.
Note 2:DC insertion gain is defined as ΔVOUT / ΔVIN.
Note 3:OS voltages above VDD - 1V saturate the input and result in a 75μA typical input leakage current.
Note 4:fOSC(kHz) ≅53 ·103/ COSC(pF).
fIN= 0.5fC-0.10.0
fIN= 2fC
fIN= fC-3.5-3.0-2.5Insertion Gain Relative toGain-48-43
fIN= 3fC
CONDITIONSUNITSMINTYPMAXPARAMETER
th-Order, Lowpass, Butterworth,itched-Capacitor FilterFREQUENCY RESPONSE
AX7480 toc01
INPUT FREQUENCY (kHz)
(d
fC = 1kHz
PASSBAND FREQUENCY RESPONSE
X7480 toc02
INPUT FREQUENCY (Hz)
(d
fC = 1kHz
SUPPLY CURRENT vs. TEMPERATURE
AX7480 toc05
TEMPERATURE (°C)
(m
NO LOAD
INTERNAL OSCILLATOR FREQUENCY vs.
COSC CAPACITANCE
AX7480 toc08
CAPACITANCE (nF)
(k
DC OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
X7480-06
SUPPLY VOLTAGE (V)
(m
VIN = VCOM
NORMALIZED INTERNAL OSCILLATOR
FREQUENCY vs. SUPPLY VOLTAGE
AX7480-09
SUPPLY VOLTAGE (V)COSC = 530pF
PHASE RESPONSE
AX7480 toc03
INPUT FREQUENCY (Hz)
(D
fC = 1kHz
SUPPLY CURRENT vs. SUPPLY VOLTAGE
AX7480 toc04
SUPPLY VOLTAGE (V)
(m
NO LOAD
OFFSET VOLTAGE vs. TEMPERATURE
X7401 toc07
TEMPERATURE (°C)
(m
VIN = VCOM = VDD / 2
Typical Operating Characteristics
(VDD= +5V, fCLK= 100kHz, SHDN= VDD, VCOM= VOS= VDD/ 2, TA= +25°C, unless otherwise noted.)
th-Order, Lowpass, Butterworth, itched-Capacitor FilteTypical Operating Characteristics (continued)
(VDD= +5V, fCLK= 100kHz, SHDN= VDD, VCOM= VOS= VDD/ 2, TA= +25°C, unless otherwise noted.)
NORMALIZED OSCILLATOR FREQUENCY
vs. TEMPERATURE
7480 toc10
TEMPERATURE (°C)COSC = 530pF
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT SIGNAL AMPLITUDE
7480 toc11
AMPLITUDE (Vp-p)
(d
NO LOAD
(SEE TABLE A)
Table A. THD+N vs. Input Signal
Amplitude Test Conditions
MEASUREMENT
BANDWIDTH (kHz)
fCLK
(kHz)200B400A
(kHz)
fIN
(Hz)TRACE
th-Order, Lowpass, Butterworth,itched-Capacitor FilterNAMEFUNCTIONCOMCommon Input Pin. Biased internally at mid-supply. Bypass externally to GND with a 0.1μF capacitor. To
override internal biasing, drive with an external supply.INFilter Input
PINGNDGround VDD+5V Supply InputCLKClock Input. To override the internal oscillator, connect to an external clock; otherwise, connect an external
capacitor (COSC) from CLK to GND to set the internal oscillator frequency.SHDNShutdown Input. Drive low to enable shutdown mode; drive high or connect to VDDfor normal operation. OSOffset Adjust Input. To adjust output offset, bias OS externally. Connect OS to COM if no offset adjustment is
needed. Refer to Offset and Common-Mode Input Adjustment section.OUTFilter Output
Pin Description
_______________Detailed Description
The MAX7480 Butterworth filter operates with a 100:1
clock-to-corner frequency ratio and a 2kHz maximum
corner frequency.
Lowpass Butterworth filters provide a maximally flat
passband response, making them ideal for instrumen-
tation applications that require minimum deviation from
the DC gain throughout the passband.
Figure 1 shows the difference between Bessel and
Butterworth filter frequency responses. With the filter
cutoff frequencies set at 1kHz, trace A shows the
Bessel filter response and trace B shows the
Butterworth filter response.
Background Information
Most switched-capacitor filters (SCFs) are designed
with biquadratic sections. Each section implements two
filtering poles, and the sections are cascaded to pro-
duce higher-order filters. The advantage to this
approach is ease of design. However, this type of
design is highly sensitive to component variations if any
section’s Q is high. An alternative approach is to emu-
late a passive network using switched-capacitor inte-
grators with summing and scaling. Figure 2 shows a
basic 8th-order ladder filter structure.
A switched-capacitor filter such as the MAX7480 emu-
lates a passive ladder filter. The filter’s component sen-
sitivity is low when compared to a cascaded biquad
design, because each component affects the entire fil-
ter shape, not just one pole-zero pair. In other words, a
mismatched component in a biquad design will have a
concentrated error on its respective poles, while the
same mismatch in a ladder filter design results in an
error distributed over all poles.
FREQUENCY (kHz)
(d
A: BESSEL FILTER RESPONSE; fC = 1kHz
B: BUTTERWORTH FILTER RESPONSE; fC = 1kHz
Figure 1. Bessel vs. Butterworth Filter Frequency ResponseL5L7R2C4C2VIN+V0R1
Figure 2. 8th-Order Ladder Filter Network

Partno	Mfg	Dc	Qty	Available	Descript
MAX7480ESA+	MAXIM	N/a	1500	avai	8th-Order, Lowpass, Butterworth, Switched-Capacitor Filter