May 1997
ML2111*
Universal Dual High Frequency Filter
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
s
s
Specified for operation up to 150kHz
Center frequency x Q product
£
5MHz
Separate highpass, notch, allpass, bandpass, and
lowpass outputs
Center frequency accuracy of ±0.4% or ±0.8% max.
Q accuracy of ±4% or ±8% max.
Clock inputs are TTL or CMOS compatible
Single 5V (±2.25V) or ±5V supply operation
s
s
s
s
* Some Packages Are End Of Life and Obsolete
BLOCK DIAGRAM
7
VA+
INVA
4
-
+
8
VD+
N/AP/HPA
3
-
+
5
S1A
2
BPA
1
LPA
Σ
-
S2A
∫
∫
AGND
15
CLKA
10
50/100HOLD
12
LEVEL SHIFT
9
CLKB
11
LEVEL
SHIFT
NON-OVERLAP
CLOCK
CONTROL
LEVEL
SHIFT
NON-OVERLAP
CLOCK
SA/B
6
-
INVB
17
VA-
14
VD-
13
-
+
S2B
+
Σ
-
S1B
16
∫
BPB
19
∫
LPB
20
N/AP/HPB
18
1
ML2111
PIN CONFIGURATION
ML2111
20-Pin PDIP (P20)
20-Pin SOIC (S20)
LPA 1
BPA 2
N/AP/HPA 3
INVA 4
S1A 5
SA/B 6
VA+ 7
VD+ 8
LSh 9
CLKA 10
20 LPB
19 BPB
18 N/AP/HPB
17 INVB
16 S1B
15 AGND
14 VA-
13 VD-
12 50/100/HOLD
11 CLKB
TOP VIEW
PIN DESCRIPTION
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1
2
3
4
5
6
7
8
9
LP
A
BP
A
N/AP/HP
A
INV
A
S1
A
S
A/B
V
A+
V
D+
LSh
Lowpass output for biquad A.
Bandpass output for biquad A.
Notch/allpass/highpass output for
biquad A.
Inverting input of the summing op amp
for biquad A.
Auxiliary signal input pin used in
modes 1a, 1d, 4, 5, and 6b.
Controls S2 input function.
11
12
CLK
B
Clock input for biquad B.
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.
50/100/HOLD
Input pin to control the clock-to-
13
14
15
16
V
D-
V
A-
AGND
S1
B
INV
B
N/AP/HP
B
BP
B
LP
B
Negative digital supply.
Negative analog supply.
Analog ground.
Auxiliary signal input pin used in
modes 1a, 1d, 4, 5, and 6b.
Inverting input of the summing op amp
for biquad B.
Notch/allpass/highpass output for
biquad B.
Bandpass output for biquad B.
Lowpass output for biquad B.
Positive analog supply.
Positive digital supply.
Reference point for clock input levels.
Logic threshold typically 1.4V above
LSh voltage.
Clock input for biquad A.
17
18
19
20
10
CLK
A
2
ML2111
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 .............................................. 150ºC
Storage Temperature Range ...................... –65ºC to 150ºC
Lead Temperature (Soldering, 10 sec) ..................... 300ºC
Thermal Resistance (q
JA
)
20-Pin PDIP ...................................................... 67ºC/W
20-Pin SOIC ..................................................... 95ºC/W
OPERATING CONDITIONS
Temperature Range
ML2111CCX .............................................. 0ºC to 70ºC
ML2111CIP ............................................. -40ºC to 85ºC
Supply Range ........................................ ±2.25V to ±6.0V
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
FILTER
f
0(MAX)
Maximum Center Frequency (Note 2)
V
IN=
1V
PK
(0.707V
RMS
)
Figure 15 (Mode 1),
Q
£
50, Q Accuracy
£
± 25%
Figure 15 (Mode 1),
Q
£
20, Q Accuracy
£
± 15%
f
0(MIN)
Minimum Center Frequency (Note 2)
V
IN=
1V
PK
(0.707V
RMS
)
Figure 15 (Mode 1),
Q
£
50, Q Accuracy
£
± 30%
Figure 15 (Mode 1),
Q
£
20, Q Accuracy
£
± 15%
f
0
Temperature Coefficient
Clock to Center Frequency Ratio
Q = 10, Figure 15 (Mode 1)
100:1, f
CLK
= 5MHz
f
CLK
< 5MHz
50:1, f
CLK
= 5MHz
B Suffix
C Suffix
B Suffix
C Suffix
f
CLK
Clock Frequency
Clock Feedthrough
Q Accuracy
Q
£
20, Q Accuracy
£
±15%
f
CLK
£
5MHz
f
CLK
= 5MHz, Q = 10,
50:1, Figure 15 (Mode 1)
f
CLK
= 5MHz, Q = 10,
100:1, Figure 15 (Mode 1)
Q Temperature Coefficient
V
OS2,3
DC Offset
f
CLK
< 5MHz, Q = 10
50:1, f
CLK
= 5MHz
S
A/B
= High or Low
100:1, f
CLK
= 5MHz
S
A/B
=High or Low
B Suffix
C Suffix
B Suffix
C Suffix
B Suffix
C Suffix
B Suffix
C Suffix
20
7
7
14
14
40
60
60
100
49.65
49.45
99.6
99.2
2.5
10
25
25
-10
49.85
49.85
100.0
100.0
50.05
50.25
100.4
100.8
7500
20
±3
±5
±4
±8
kHz
mV
(P-P)
%
%
%
%
ppm/ºC
mV
mV
mV
mV
100
150
kHz
kHz
Hz
Hz
ppm/ºC
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
3
ML2111
ELECTRICAL CHARACTERISTICS
SYMBOL
FILTER
(Continued)
Gain Accuracy, DC Lowpass
Gain Accuracy, Bandpass at f
0
R1,R3 = 20kW, R2 = 2kW,
100:1, f
0
= 50kHz, Q = 10
R1,R3 = 20kW, R2 = 2kW,
100:1, f
0
= 50kHz, Q = 10
Gain Accuracy, DC Notch Output
Noise (Note 3)
Figure 15 (Mode 1),
Q = 1, R1 = R2 = R3 = 2kW
Lowpass
R1,R3 = 20kW, R2 = 2kW,
100:1, f
0
= 50kHz, Q = 10
Bandpass
100kHz, 50:1
50kHz, 100:1
100kHz, 50:1
50kHz, 100:1
Notch
100kHz, 50:1
50kHz, 100:1
Noise (Note 3)
Figure 15 (Mode 1),
Q = 10, R3 = 20kW, R2 = 2kW
Bandpass,
R1 = 20kW
Lowpass,
R1 = 2kW
Notch,
R1 = 2kW
Crosstalk
100kHz, 50:1
50kHz, 100:1
100kHz, 50:1
50kHz, 100:1
100kHz, 50:1
50kHz, 100:1
B Suffix
C Suffix
0.01
1
1
0.02
103
121
120
150
115
135
262
333
268
342
64
72
-50
2
4
6
2
%
%
%
%
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
dB
PARAMETER
(Continued)
CONDITIONS
MIN
TYP
MAX
UNITS
f
CLK
= 5MHz, f
0
= 100kHz
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),
Q
£
50, Q Accuracy
£
± 30%
Figure 15 (Mode 1),
Q
£
20, Q Accuracy
£
± 15%
f
0(MIN)
Minimum Center Frequency
Figure 15 (Mode 1),
Q
£
50, Q Accuracy
£
± 30%
Figure 15 (Mode 1),
Q
£
20, Q Accuracy
£
± 15%
Clock to Center Frequency Ratio
Q = 10, Figure 15 (Mode 1)
100:1, f
CLK
= 2.5MHz
50:1, f
CLK
= 2.5MHz
B Suffix
C Suffix
B Suffix
C Suffix
f
CLK
Clock Frequency
Q Accuracy
Q
£
20, Q Accuracy
£
±15%
f
CLK
= 2.5MHz, Q = 10,
50:1, Figure 15 (Mode 1)
f
CLK
= 2.5MHz, Q = 10,
100:1, Figure 15 (Mode 1)
B Suffix
C Suffix
B Suffix
C Suffix
±3
±6
25
25
49.65
49.45
99.60
99.20
2.5
49.85
49.85
100.0
100.0
50.05
50.25
100.4
100.8
5000
±4
±8
kHz
%
%
%
%
75
100
kHz
kHz
Hz
Hz
4
ML2111
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
(Continued)
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)
Figure 15 (Mode 1),
Q = 1, R1 = R2 = R3 = 2kW
Lowpass
Bandpass
100kHz, 50:1
50kHz, 100:1
100kHz, 50:1
50kHz, 100:1
Notch
100kHz, 50:1
50kHz, 100:1
Noise (Note 3)
Figure 15 (Mode 1), Q = 10,
R3 = 20kW, R2 = 2kW
Bandpass,
R1 = 20kW
Lowpass,
R1 = 2kW
Notch,
R1 = 2kW
OPERATIONAL AMPLIFIERS
V
OS1
A
VOL
DC Offset Voltage
DC Open Loop Gain
Gain Bandwidth Product
Slew Rate
Output Voltage Swing (Clipping Level)
Output Short Circuit Current
R
L
= 2kW, |V| from V
A+
or V
A-
Source
Sink
CLOCK
V
CLK
Input Low Voltage
V
CLK
Input High Voltage
CLK
A
, CLK
B
Pulse Width
CLK
A
, CLK
B
Pulse Width
SUPPLY
(I
A+
)+(I
D+
) Supply Current, (V
A+
) + (V
D+
)
(I
A-
)+(I
D-
)
I
LSh
Supply Current, (V
A-
) + (V
D-
)
Supply Current, LSh
f
CLK
= 5MHz
f
CLK
= 5MHz
f
CLK
= 5MHz
13
12
0.5
22
21
1
mA
mA
mA
|V
D+
| - |V
D-
|
³
4.5V
|V
D+
| - |V
D-
|
³
.90V
3.0
100
66
0.6
V
V
ns
ns
R
L
= 1kW
2
95
2.4
2.0
0.5
50
25
1.2
15
mV
dB
MHz
V/µs
V
mA
mA
100kHz, 50:1
50kHz, 100:1
100kHz, 50:1
50kHz, 100:1
100kHz, 50:1
50kHz, 100:1
105
123
122
152
117
138
265
335
270
245
65
73
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
µV
RMS
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.
5
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