May 1997
ML2111
*
Universal Dual High Frequency Filter
BLOCK DIAGRAM
1
GENERAL DESCRIPTION
The ML2111 consists of two independent switched
capacitor filters that operate at up to 150kHz and perform
second order filter functions such as lowpass, bandpass,
highpass, notch and allpass. All filter configurations,
including Butterworth, Bessel, Cauer, and Chebyshev can
be formed.
The center frequency of these filters is tuned by an
external clock or the external clock and resistor ratio.
The ML2111 frequency range is specified up to 150kHz
with 5.0V 10% power supplies. Using a single 5.0V
10% power supply the frequency range is up to 100kHz.
These filters are ideal where center frequency accuracy
and high Qs are needed.
The ML2111 is a pin compatible superior replacement for
MF10, LMF100, and LTC1060 filters.
FEATURES
s
Specified for operation up to 150kHz
s
Center frequency x Q product
5MHz
s
Separate highpass, notch, allpass, bandpass, and
lowpass outputs
s
Center frequency accuracy of 0.4% or 0.8% max.
s
Q accuracy of 4% or 8% max.
s
Clock inputs are TTL or CMOS compatible
s
Single 5V (2.25V) or 5V supply operation
3
N/AP/HPA
2
BPA
1
LPA
4
INVA
5
S1A
S2A
10
CLKA
11
CLKB
12
50/100HOLD
9
LEVEL SHIFT
CONTROL
LEVEL
SHIFT
NON-OVERLAP
CLOCK
LEVEL
SHIFT
NON-OVERLAP
CLOCK
19
BPB
20
LPB
17
INVB
AGND
15
16
18
N/AP/HPB
S1B
6
SA/B
S2B
8
VD+
7
VA+
14
VA-
13
VD-
-
+
-
+
+
-
-
+
-
-
* Some Packages Are End Of Life and Obsolete
ML2111
2
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
LP
A
Lowpass output for biquad A.
2
BP
A
Bandpass output for biquad A.
3
N/AP/HP
A
Notch/allpass/highpass output for
biquad A.
4
INV
A
Inverting input of the summing op amp
for biquad A.
5
S1
A
Auxiliary signal input pin used in
modes 1a, 1d, 4, 5, and 6b.
6
S
A/B
Controls S2 input function.
7
V
A+
Positive analog supply.
8
V
D+
Positive digital supply.
9
LSh
Reference point for clock input levels.
Logic threshold typically 1.4V above
LSh voltage.
10
CLK
A
Clock input for biquad A.
PIN
NAME
FUNCTION
11
CLK
B
Clock input for biquad B.
12
50/100/HOLD
Input pin to control the clock-to-
center-frequency ratio of 50:1 or
100:1, or to stop the clock to hold the
last sample of the bandpass or lowpass
outputs.
13
V
D-
Negative digital supply.
14
V
A-
Negative analog supply.
15
AGND
Analog ground.
16
S1
B
Auxiliary signal input pin used in
modes 1a, 1d, 4, 5, and 6b.
17
INV
B
Inverting input of the summing op amp
for biquad B.
18
N/AP/HP
B
Notch/allpass/highpass output for
biquad B.
19
BP
B
Bandpass output for biquad B.
20
LP
B
Lowpass output for biquad B.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
LPA
BPA
N/AP/HPA
INVA
S1A
SA/B
VA+
VD+
LSh
CLKA
LPB
BPB
N/AP/HPB
INVB
S1B
AGND
VA-
VD-
50/100/HOLD
CLKB
TOP VIEW
ML2111
20-Pin PDIP (P20)
20-Pin SOIC (S20)
ML2111
3
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
A+
= V
D+
= 5V 10%, V
A-
= V
D-
= -5V 10%, C
L
= 25pF, V
IN
= 1.41V
PK
(1.000V
RMS
),
Clock Duty Cycle = 50%, T
A
= Operating Temperature Range (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FILTER
f
0(MAX)
Maximum Center Frequency (Note 2)
Figure 15 (Mode 1),
100
kHz
V
IN=
1V
PK
(0.707V
RMS
)
Q
50, Q Accuracy 25%
Figure 15 (Mode 1),
150
kHz
Q
20, Q Accuracy 15%
f
0(MIN)
Minimum Center Frequency (Note 2)
Figure 15 (Mode 1),
25
Hz
V
IN=
1V
PK
(0.707V
RMS
)
Q
50, Q Accuracy 30%
Figure 15 (Mode 1),
25
Hz
Q
20, Q Accuracy 15%
f
0
Temperature Coefficient
f
CLK
< 5MHz
-10
ppm/C
Clock to Center Frequency Ratio
50:1, f
CLK
= 5MHz
B Suffix
49.65
49.85
50.05
Q = 10, Figure 15 (Mode 1)
C Suffix
49.45
49.85
50.25
100:1, f
CLK
= 5MHz
B Suffix
99.6
100.0
100.4
C Suffix
99.2
100.0
100.8
f
CLK
Clock Frequency
Q
20, Q Accuracy 15%
2.5
7500
kHz
Clock Feedthrough
f
CLK
5MHz
10
20
mV
(P-P)
Q Accuracy
f
CLK
= 5MHz, Q = 10,
B Suffix
3
%
50:1, Figure 15 (Mode 1)
C Suffix
5
%
f
CLK
= 5MHz, Q = 10,
B Suffix
4
%
100:1, Figure 15 (Mode 1) C Suffix
8
%
Q Temperature Coefficient
f
CLK
< 5MHz, Q = 10
20
ppm/C
V
OS2,3
DC Offset
50:1, f
CLK
= 5MHz
B Suffix
7
40
mV
S
A/B
= High or Low
C Suffix
7
60
mV
100:1, f
CLK
= 5MHz
B Suffix
14
60
mV
S
A/B
=High or Low
C Suffix
14
100
mV
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which
the device could be permanently damaged. Absolute
maximum ratings are stress ratings only and functional
device operation is not implied.
Supply Voltage
|V
A+
|, |V
D+
| - |V
A-
|, |V
D-
| ...................................... 13V
V
A+
, V
D+
to LSh ..................................................... 13V
Inputs ...................... |V
A+
, V
D+
| +0.3V to |V
A-
, V
D-
| -0.3V
Outputs ................... |V
A+
, V
D+
| +0.3V to |V
A-
, V
D-
| -0.3V
|V
A+
| to |V
D+
| ........................................................ 0.3V
Junction Temperature .............................................. 150C
Storage Temperature Range ...................... 65C to 150C
Lead Temperature (Soldering, 10 sec) ..................... 300C
Thermal Resistance (
q
JA
)
20-Pin PDIP ...................................................... 67C/W
20-Pin SOIC ..................................................... 95C/W
OPERATING CONDITIONS
Temperature Range
ML2111CCX .............................................. 0C to 70C
ML2111CIP ............................................. -40C to 85C
Supply Range ........................................ 2.25V to 6.0V
ML2111
4
ELECTRICAL CHARACTERISTICS
(Continued)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FILTER (Continued)
Gain Accuracy, DC Lowpass
R1,R3 = 20k
W, R2 = 2kW,
0.01
2
%
100:1, f
0
= 50kHz, Q = 10
Gain Accuracy, Bandpass at f
0
R1,R3 = 20k
W, R2 = 2kW, B Suffix
1
4
%
100:1, f
0
= 50kHz, Q = 10
C Suffix
1
6
%
Gain Accuracy, DC Notch Output
R1,R3 = 20k
W, R2 = 2kW,
0.02
2
%
100:1, f
0
= 50kHz, Q = 10
Noise (Note 3)
Bandpass
100kHz, 50:1
103
V
RMS
Figure 15 (Mode 1),
50kHz, 100:1
121
V
RMS
Q = 1, R1 = R2 = R3 = 2k
W
Lowpass
100kHz, 50:1
120
V
RMS
50kHz, 100:1
150
V
RMS
Notch
100kHz, 50:1
115
V
RMS
50kHz, 100:1
135
V
RMS
Noise (Note 3)
Bandpass,
100kHz, 50:1
262
V
RMS
Figure 15 (Mode 1),
R1 = 20k
W
50kHz, 100:1
333
V
RMS
Q = 10, R3 = 20k
W, R2 = 2kW
Lowpass,
100kHz, 50:1
268
V
RMS
R1 = 2k
W
50kHz, 100:1
342
V
RMS
Notch,
100kHz, 50:1
64
V
RMS
R1 = 2k
W
50kHz, 100:1
72
V
RMS
Crosstalk
f
CLK
= 5MHz, f
0
= 100kHz
-50
dB
FILTER, V
A
+ = V
D
+ = 2.25V, V
A
- = V
D
- = -2.25V, V
IN
= 0.707 x V
PK
(0.5 x V
RMS
)
f
0(MAX)
Maximum Center Frequency
Figure 15 (Mode 1),
75
kHz
Q
50, Q Accuracy 30%
Figure 15 (Mode 1),
100
kHz
Q
20, Q Accuracy 15%
f
0(MIN)
Minimum Center Frequency
Figure 15 (Mode 1),
25
Hz
Q
50, Q Accuracy 30%
Figure 15 (Mode 1),
25
Hz
Q
20, Q Accuracy 15%
Clock to Center Frequency Ratio
50:1, f
CLK
= 2.5MHz
B Suffix
49.65
49.85
50.05
Q = 10, Figure 15 (Mode 1)
C Suffix
49.45
49.85
50.25
100:1, f
CLK
= 2.5MHz
B Suffix
99.60
100.0
100.4
C Suffix
99.20
100.0
100.8
f
CLK
Clock Frequency
Q
20, Q Accuracy 15%
2.5
5000
kHz
Q Accuracy
f
CLK
= 2.5MHz, Q = 10,
B Suffix
4
%
50:1, Figure 15 (Mode 1)
C Suffix
8
%
f
CLK
= 2.5MHz, Q = 10,
B Suffix
3
%
100:1, Figure 15 (Mode 1) C Suffix
6
%
ML2111
5
ELECTRICAL CHARACTERISTICS
(Continued)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FILTER, V
A
+ = V
D
+ = 2.25V, V
A
- = V
D
- = -2.25V, V
IN
= 0.707 x V
PK
(0.5 x V
RMS
) (Continued)
Noise (Note 3)
Bandpass
100kHz, 50:1
105
V
RMS
Figure 15 (Mode 1),
50kHz, 100:1
123
V
RMS
Q = 1, R1 = R2 = R3 = 2k
W
Lowpass
100kHz, 50:1
122
V
RMS
50kHz, 100:1
152
V
RMS
Notch
100kHz, 50:1
117
V
RMS
50kHz, 100:1
138
V
RMS
Noise (Note 3)
Bandpass,
100kHz, 50:1
265
V
RMS
Figure 15 (Mode 1), Q = 10,
R1 = 20k
W
50kHz, 100:1
335
V
RMS
R3 = 20k
W, R2 = 2kW
Lowpass,
100kHz, 50:1
270
V
RMS
R1 = 2k
W
50kHz, 100:1
245
V
RMS
Notch,
100kHz, 50:1
65
V
RMS
R1 = 2k
W
50kHz, 100:1
73
V
RMS
OPERATIONAL AMPLIFIERS
V
OS1
DC Offset Voltage
2
15
mV
A
VOL
DC Open Loop Gain
R
L
= 1k
W
95
dB
Gain Bandwidth Product
2.4
MHz
Slew Rate
2.0
V/s
Output Voltage Swing (Clipping Level)
R
L
= 2k
W, |V| from V
A+
or V
A-
0.5
1.2
V
Output Short Circuit Current
Source
50
mA
Sink
25
mA
CLOCK
V
CLK
Input Low Voltage
0.6
V
V
CLK
Input High Voltage
3.0
V
CLK
A
, CLK
B
Pulse Width
|V
D+
| - |V
D-
|
4.5V
100
ns
CLK
A
, CLK
B
Pulse Width
|V
D+
| - |V
D-
|
.90V
66
ns
SUPPLY
(I
A+
)+(I
D+
) Supply Current, (V
A+
) + (V
D+
)
f
CLK
= 5MHz
13
22
mA
(I
A-
)+(I
D-
)
Supply Current, (V
A-
) + (V
D-
)
f
CLK
= 5MHz
12
21
mA
I
LSh
Supply Current, LSh
f
CLK
= 5MHz
0.5
1
mA
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions.
Note 2: The center frequency is defined as the peak of the bandpass output.
Note 3: The noise is meassured with an HP8903A audio analyzer with a bandwidth of 700kHz, which is 7.5 times the f
0
at 50:1 and 15 times the f
0
at 100:1.
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