MAX262 Datasheet PDF - Maxim Integrated
| Part Number | MAX262 | |
| Description | Microprocessor Programmable Universal Active Filters | |
| Manufacturers | Maxim Integrated | |
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19-0352; Rev 2; 7/02
Microprocessor Programmable
Universal Active Filters
General Description
The MAX260/MAX261/MAX262 CMOS dual second-
order universal switched-capacitor active filters allow
microprocessor control of precise filter functions. No
external components are required for a variety of band-
pass, lowpass, highpass, notch, and allpass configura-
tions. Each device contains two second-order filter
sections that place center frequency, Q, and filter oper-
ating mode under programmed control.
An input clock, along with a 6-bit f0 program input,
determine the filter's center or corner frequency without
affecting other filter parameters. The filter Q is also pro-
grammed independently. Separate clock inputs for
each filter section operate with either a crystal, RC net-
work, or external clock generator.
The MAX260 has offset and DC specifications superior
to the MAX261 and MAX262 and a center frequency
(f0) range of 7.5kHz. The MAX261 handles center fre-
quencies to 57kHz, while the MAX262 extends the cen-
ter frequency range to 140kHz by employing lower
clock-to-f0 ratios. All devices are available in 24-pin DIP
and small outline packages in commercial, extended,
and military temperature ranges.
Applications
µP-Tuned Filters
Anti-Aliasing Filters
Digital Signal Processing
Adaptive Filters
Signal Analysis
Phase-Locked Loops
Functional Diagram
INPUT
+5V V+
IN LP HP BP
FILTER
A
OUTPUT
IN LP HP BP
FILTER
B
GND
MAX260
-5V V- MAX261
MAX262
CLKA OSC CLKOUT
CLKB
CRYSTAL
PROGRAM
INPUTS
FOURTH-ORDER BANDPASS FILTER
Features
o Filter Design Software Available
o Microprocessor Interface
o 64-Step Center Frequency Control
o 128-Step Q Control
o Independent Q and f0 Programming
o Guaranteed Clock to f0 Ratio-1% (A grade)
o 75kHz f0 Range (MAX262)
o Single +5V and ±5V Operation
Ordering Information
PART
TEMP RANGE PACKAGE ACCURACY
MAX260ACNG 0°C to +70°C Plastic DIP
1%
MAX260BCNG 0°C to +70°C Plastic DIP
2%
MAX260AENG -40°C to +85°C Plastic DIP
1%
MAX260BENG -40°C to +85°C Plastic DIP
2%
MAX260ACWG 0°C to +70°C Wide SO
1%
MAX260BCWG 0°C to +70°C Wide SO
2%
MAX260AMRG -55°C to +125°C CERDIP
1%
MAX260BMRG -55°C to +125°C CERDIP
2%
*All devices—24-pin packages 0.3in-wide packages
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
BPA 1
N.C. 2
HPA 3
N.C. 4
INA 5
D1 6
A3 7
CLK OUT 8
V+ 9
A2 10
CLKA 11
CLKB 12
MAX260
24 LPA
BPA 1
23 INB
22 LPB
OP OUT 2
HPA 3
21 BPB
OP IN 4
20 D0
19 OSC OUT
INA 5
D1 6
18 GND
17 V-
A3 7
CLK OUT 8
16 WR
V+ 9
15 A0
A2 10
14 HPB
CLKA 11
13 A1
CLKB 12
MAX261
MAX262
24 LPA
23 INB
22 LPB
21 BPB
20 HPB
19 D0
18 OSC OUT
17 GND
16 V-
15 WR
14 A0
13 A1
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Microprocessor Programmable
Universal Active Filters
PIN
MAX260
9
17
MAX261/
MAX262
9
16
NAME
V+
V-
18 17 GND
11 11 CLKA
12 12 CLKB
FUNCTION
Positive supply voltage
Negative supply voltage
Analog Ground. Connect
to the system ground for
dual supply operation or
mid-supply for single sup-
ply operation. GND should
be well bypassed in single
supply applications.
Input to the oscillator and
clock input to section A.
This clock is internally
divided by 2.
Clock input to filter B. This
clock is internally divided
by 2.
8 8 CLK OUT Clock output for crystal
and R-C oscillator operation
19 18 OSC OUT Connects to crystal or R-C
for self-clocked operation
Pin Description
PIN
MAX260 MAX261/ NAME
MAX262
FUNCTION
5, 23
1, 21
24, 22
3, 14
16
15, 13,
10, 7
20, 6
5, 23
1, 21
24, 22
3, 20
15
14, 13,
10, 7
19, 6
2
INA, INB
BPA, BPB
LPA, LPB
HPA, HPB
WR
A0, A1,
A2, A3
D0, D1
OP OUT
Filter inputs
Bandpass outputs
Lowpass outputs
Highpass/notch/allpass
outputs
Write enable input
Address inputs for f0 and
Q input data locations
Data inputs for f0 and Q
programming
Output of uncommitted
op amp on MAX261/
MAX262 only. Pin 2 is a no-
connect on the MAX260.
Inverting input of uncom-
mitted op amp on MAX261/
4
OP IN
MAX262 only (noninverting
input is internally connected
to ground). Pin 4 is a no-
connect on the MAX260.
_______________________________________________________________________________________ 5
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| Information | Total 26 Pages | |
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