|
|
PDF MAX7400 Data sheet ( Hoja de datos )
| Número de pieza | MAX7400 | |
| Descripción | 8th-Order / Lowpass / Elliptic / Switched-Capacitor Filters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX7400 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
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.
1 page  
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ELLIPTIC (r = 1.2) FILTER CHARACTERISTICS—MAX7403/MAX7407
(VDD = +5V for MAX7403, VDD = +3V for MAX7407; filter output measured at OUT; 10kΩ || 50pF load to GND at OUT; SHDN = VDD;
VCOM = VOS = VDD / 2; fCLK = 100kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Insertion Gain Relative to DC Gain
(Note 5)
fIN = 0.408fC
fIN = 0.640fC
fIN = 0.784fC
fIN = 0.902fC
fIN = 0.956fC
fIN = 0.992fC
fIN = 1.000fC
fIN = 1.200fC
fIN = 1.261fC
fIN = 1.533fC
fIN = 2.875fC
-0.20
-0.20
-0.20
-0.20
-0.20
-0.20
-0.20
-0.11
0.02
-0.06
0.10
0.02
0.14
0.09
-58
-59
-60
-60
0.20
0.20
0.20
0.20
0.20
0.30
0.30
-50
-54
-54
-54
dB
Note 1: The maximum fC is defined as the clock frequency, fCLK = 100 · fC, at which the peak SINAD drops to 68dB with a
sinusoidal input at 0.2fC.
Note 2: DC insertion gain is defined as ∆VOUT / ∆VIN.
Note 3: OS voltages above VDD - 1V saturate the input and result in a 75µA typical input leakage current.
Note 4: For MAX7400/MAX7403, fOSC (kHz) ≅ 38 · 103 / COSC (pF). For MAX7404/MAX7407, fOSC (kHz) ≅ 34 · 103 / COSC (pF).
Note 5: The input frequencies, fIN, are selected at the peaks and troughs of the frequency responses.
Typical Operating Characteristics
(VDD = +5V for MAX7400/MAX7403, VDD = +3V for MAX7404/MAX7407; VCOM = VOS = VDD / 2; SHDN = VDD; fCLK = 100kHz;
TA = +25°C; unless otherwise noted.)
20
0
-20
-40
-60
-80
-100
-120
0
MAX7400/MAX7404 (r = 1.5)
FREQUENCY RESPONSE
fC = 1kHz
1234
INPUT FREQUENCY (kHz)
5
MAX7400/MAX7404 (r = 1.5)
PASSBAND FREQUENCY RESPONSE
0.24
fC = 1kHz
0.20
0.16
0.12
0.08
0.04
0
-0.04
-0.08
0
202 404 606 808
INPUT FREQUENCY (Hz)
1010
0
-80
-160
-240
-320
-400
-480
-560
-640
0
MAX7400/MAX7404 (r = 1.5)
PHASE RESPONSE
fC = 1kHz
300 600 900 1200 1500
INPUT FREQUENCY (Hz)
_______________________________________________________________________________________ 5
5 Page 
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
with VCOM = VDD / 2 (typical), and where (VIN - VCOM)
is lowpass filtered by the SCF, and VOS is added at the
output stage. See the Electrical Characteristics for
COM and OS input voltage ranges. Changing the volt-
age on COM or OS significantly from midsupply
reduces the filter’s dynamic range.
Power Supplies
The MAX7400/MAX7403 operate from a single +5V
supply. The MAX7404/MAX7407 operate from a single
+3V supply. Bypass VDD to GND with a 0.1µF capaci-
tor. If dual supplies are required, connect COM to the
system ground and GND to the negative supply. Figure
5 shows an example of dual-supply operation. Single-
supply and dual-supply performance are equivalent.
For single-supply or dual-supply operation, drive CLK
and SHDN from GND (V- in dual-supply operation) to
VDD. For a ±2.5V supply, use the MAX7400 or MAX7403;
for a ±1.5V supply, use MAX7404 or MAX7407. For ±5V
dual-supply applications, use the MAX291–MAX297.
Input Signal Amplitude Range
The ideal input signal range is determined by observ-
ing the voltage level at which the total harmonic
distortion plus noise (THD+N) is minimized for a given
corner frequency. The Typical Operating Character-
istics show THD+N response as the input signal’s
peak-to-peak amplitude is varied. These measurements
are made with OS and COM biased at midsupply.
Anti-Aliasing and Post-DAC Filtering
When using the MAX7400/MAX7403/MAX7404/
MAX7407 for anti-aliasing or post-DAC filtering, syn-
chronize the DAC and the filter clocks. If the clocks are
not synchronized, beat frequencies may alias into the
passband.
The high clock-to-corner frequency ratio (100:1) also
eases the requirements of pre- and post-SCF filtering.
At the input, a lowpass filter prevents the aliasing of fre-
quencies around the clock frequency into the pass-
band. At the output, a lowpass filter attenuates the
clock feedthrough.
A high clock-to-corner frequency ratio allows a simple
RC lowpass filter, with the cutoff frequency set above
the SCF corner frequency, to provide input anti-aliasing
and reasonable output clock attenuation.
Harmonic Distortion
Harmonic distortion arises from nonlinearities within the
filter. Such nonlinearities generate harmonics when a
pure sine wave is applied to the filter input. Table 1 lists
typical harmonic distortion values with a 10kΩ load and
an input signal of 4Vp-p (MAX7400/MAX7403) or 2Vp-p
(MAX7404/MAX7407), at TA = +25°C.
V+
VDD SHDN *
OUT OUTPUT
INPUT IN
COM
MAX7400
MAX7403
V+
V-
CLOCK
CLK
MAX7404
MAX7407
OS
0.1µF
0.1µF
GND
V-
*DRIVE SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.
Figure 5. Dual-Supply Operation
Table 1. Typical Harmonic Distortion
FILTER
TYPICAL
HARMONIC
fCLK fC
fIN VIN DISTORTION (dB)
(kHz) (kHz) (Hz) (Vp-p)
2nd 3rd 4th 5th
100
MAX7400
500
100
MAX7403
500
100
MAX7404
500
100
MAX7407
500
1 200
-89 -82 -89 -86
4
5 1000
-89 -77 -93 -88
1 200
-88 -81 -91 -87
4
5 1000
-84 -80 -90 -91
1 200
-85 -82 -85 -86
2
5 1000
-85 -81 -86 -84
1 200
-85 -82 -85 -86
2
5 1000
-86 -84 -85 -86
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX7400.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX7400 | 8th-Order / Lowpass / Elliptic / Switched-Capacitor Filters | Maxim Integrated |
| MAX7401 | 8th-Order / Lowpass / Bessel / Switched-Capacitor Filters | Maxim Integrated |
| MAX7403 | 8th-Order / Lowpass / Elliptic / Switched-Capacitor Filters | Maxim Integrated |
| MAX7404 | 8th-Order / Lowpass / Elliptic / Switched-Capacitor Filters | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |