LANSDALE MC3372D

ML3371
ML3372
Low Power
Narrowband FM IF
Legacy Device: Motorola MC3371, MC3372
The ML3371 and ML3372 perform single conversion FM
reception and consist of an oscillator, mixer, limiting IF amplifier, quadrature discriminator, active filter, squelch switch, and
meter drive circuitry. These devices are designed for use in FM
dual conversion communication equipment. The ML3371/ML3372
are similar to the Motorola MC3361/MC3357 FM IFs, except
that a signal strength indicator replaces the scan function controlling driver which is in the MC3361/MC3357. The ML3371 is
designed for the use of parallel LC components, while the
ML3372 is designed for use with either a 455 kHz ceramic discriminator, or parallel LC components.
These devices also require fewer external parts than earlier
products. The ML3371 and ML3372 are available in dual–in–line
and surface mount packaging.
• Wide Operating Supply Voltage Range: VCC = 2.0 to 9.0 V
• Input Limiting Voltage Sensitivity of –3.0 dB
• Low Drain Current: ICC = 3.2 mA, @ VCC = 4.0 V,
Squelch Off
• Minimal Drain Current Increase When Squelched
• Signal Strength Indicator: 60 dB Dynamic Range
• Mixer Operating Frequency Up to 100 MHz
• Fewer External Parts Required than Earlier Devices
• Operating Temperature Range TA = –30° to +70°C
16
1
P DIP 16 = EP
PLASTIC PACKAGE
CASE 648
16
1
SO 16 = -5P
PLASTIC PACKAGE
CASE 751B
(SO–16)
CROSS REFERENCE/ORDERING INFORMATION
MOTOROLA
PACKAGE
LANSDALE
P DIP 16
MC3371P
ML3371EP
SO 16
MC3371D
ML3371-5P
P DIP 16
MC3372P
ML3372EP
SO 16
MC3372D
ML3372-5P
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
MAXIMUM RATINGS
Rating
Power Supply Voltage
RF Input Voltage (VCC
4.0 Vdc)
Pin
Symbol
Value
4
VCC(max)
V16
10
Vdc
1.0
Vrms
16
Unit
Detector Input Voltage
8
V8
1.0
Vpp
Squelch Input Voltage
(VCC
4.0 Vdc)
12
V12
6.0
Vdc
Mute Function
14
14
V14
l14
–0.7 to 10
Mute Sink Current
50
Vpk
mA
Junction Temperature
–
150
°C
Storage Temperature Range
–
–65 to +150
°C
TJ
Tstg
NOTES: 1. Devices should not be operated at these values. The “Recommended Operating
Conditions” table provides conditions for actual device operation.
PIN CONNECTIONS
1
16 Mixer Input
2
15 Gnd
Mixer Output 3
14 Mute
VCC 4
Limiter Input 5
13 Meter Drive
Crystal Osc
Decoupling
12 Squelch Input
6
11 Filter Output
7
10 Filter Input
Quad Coil 8
Page 1 of 19
ML3371
(Top View)
1
16 Mixer Input
2
15 Gnd
Mixer Output 3
14 Mute
Crystal Osc
9 Recovered Audio
VCC 4
Limiter Input 5
Decoupling 6
Limiter Output 7
Quad Input 8
www.lansdale.com
ML3372
(Top View)
13 Meter Drive
12 Squelch Input
11 Filter Output
10 Filter Input
9 Recovered Audio
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
RECOMMENDED OPERATING CONDITIONS
Rating
Pin
Symbol
Value
Unit
Supply Voltage
(@ TA = 25°C)
( –30°C
TA
+75°C)
4
VCC
2.0 to 9.0
2.4 to 9.0
Vdc
RF Input Voltage
16
0.0005 to 10
mVrms
RF Input Frequency
16
Vrf
frf
0.1 to 100
MHz
Oscillator Input Voltage
1
80 to 400
mVrms
Intermediate Frequency
–
Vlocal
fif
455
kHz
Limiter Amp Input Voltage
5
Filter Amp Input Voltage
10
Squelch Input Voltage
12
Mute Sink Current
14
Ambient Temperature Range
–
Vif
Vfa
Vsq
lsq
TA
0 to 400
mVrms
0.1 to 300
mVrms
0 or 2
Vdc
0.1 to 30
mA
–30 to +70
°C
AC ELECTRICAL CHARACTERISTICS (VCC = 4.0 Vdc, fo = 58.1125 MHz, df = ±3.0 kHz, fmod = 1.0 kHz, 50 Ω source,
flocal = 57.6575 MHz, Vlocal = 0 dBm, TA = 25°C, unless otherwise noted)
Characteristic
Pin
Symbol
Input for 12 dB SINAD
Matched Input – (See Figures 11, 12 and 13)
Unmatched Input – (See Figures 1 and 2)
–
VSIN
Input for 20 dB NQS
–
VNQS
Recovered Audio Output Voltage
Vrf = –30 dBm
–
AFO
Recovered Audio Drop Voltage Loss
Vrf = –30 dBm, VCC = 4.0 V to 2.0 V
–
Meter Drive Output Voltage (No Modulation)
Vrf = –100 dBm
Vrf = –70 dBm
Vrf = –40 dBm
13
Filter Amp Gain
Rs = 600 Ω , fs = 10 kHz, Vfa = 1.0 mVrms
–
Mixer Conversion Gain
Vrf = –40 dBm, RL = 1.8 kΩ
–
Signal to Noise Ratio
Vrf = –30 dBm
–
Total Harmonic Distortion
Vrf = –30 dBm, BW = 400 Hz to 30 kHz
–
Detector Output Impedance
9
ZO
Detector Output Voltage (No Modulation)
Vrf = –30 dBm
9
DVO
Meter Drive
Vrf = –100 to –40 dBm
13
Meter Drive Dynamic Range
RFIn
IFIn (455 kHz)
13
Mixer Third Order Input Intercept Point
f1 = 58.125 MHz
f2 = 58.1375 MHz
–
Mixer Input Resistance
16
Mixer Input Capacitance
16
Page 2 of 19
www.lansdale.com
Min
Typ
Max
–
–
1.0
5.0
–
15
–
3.5
–
µVrms
mVrms
120
200
320
–8.0
–1.5
–
–
1.1
2.0
0.3
1.5
2.5
0.5
1.9
3.1
47
50
–
14
20
–
36
67
–
–
0.6
3.4
–
450
–
AFloss
MDrv
MV1
MV2
MV3
Unit
µVrms
dB
Vdc
AV(Amp)
dB
AV(Mix)
dB
s/n
dB
THD
%
Ω
Vdc
–
1.45
–
–
0.8
–
–
–
60
80
–
–
µA/dB
MO
MVD
dB
ITOMix
dBm
–
–22
–
Rin
–
3.3
–
kΩ
Cin
–
2.2
–
pF
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
DC ELECTRICAL CHARACTERISTICS (VCC = 4.0 Vdc, TA = 25°C, unless otherwise noted)
Pin
Characteristic
Drain Current (No Input Signal)
Squelch Off, Vsq = 2.0 Vdc
Squelch On, Vsq = 0 Vdc
Squelch Off, VCC = 2.0 to 9.0 V
4
Detector Output (No Input Signal)
DC Voltage, V8 = VCC
9
Filter Output (No Input Signal)
DC Voltage
Voltage Change, VCC = 2.0 to 9.0 V
11
Trigger Hysteresis
–
Symbol
Min
Typ
Max
lcc1
lcc2
dlcc1
–
–
–
3.2
3.6
1.0
4.2
4.8
2.0
0.9
1.6
2.3
V11
dV11
1.5
2.0
2.5
5.0
3.5
8.0
Hys
34
57
80
Unit
mA
V9
Vdc
Vdc
mV
Figure 1. ML3371 Functional Block Diagram and Test Fixture Schematic
RSSI Output
RF Input
VCC = 4.0 Vdc
FilterIn
0.1
51 k
C1
0.01
SqIn
1.0 µF
FilterOut
51
1.0 µF
14
15
0.01
510 k
Mute
16
470
13
12
11
8.2 k
10
9
Filter –
Amp
+
Squelch Trigger
with Hysteresis
AF Out
to Audio
Power Amp
AF
Amp
Demodulator
10
Mixer
Limiter
Amp
51 k
1.8 k
Oscillator
1
53 k
2
3
4
5
6
7
8
15
57.6575
MHz
22
0.1
0.33
Quad Coil TOKO
2A6597 HK (10 mm)
or
7MC–8128Z (7 mm)
0.1
20 k
0.001
muRata
CFU455D2
or
equivalent
Page 3 of 19
www.lansdale.com
0.1
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Figure 2. ML3372 Functional Block Diagram and Test Fixture Schematic
RSSI Output
RF Input
VCC = 4.0 Vdc
FilterIn
0.1
51 k
C1
0.01
SqIn
1.0 µF
FilterOut
51
1.0 µF
14
15
0.01
510 k
Mute
16
470
13
12
11
8.2 k
10
Filter –
Amp
+
Squelch Trigger
with Hysteresis
AF Out
to Audio
Power Amp
9
AF
Amp
Demodulator
10
Mixer
Limiter
Amp
53 k
Oscillator
1
2
3
4
15
57.6575
MHz
22
5
6
R10
1.8 k
0.33
C12
0.1
7
C13
0.1
R11
51 k
8
C14
27
R12
4.3 k
muRata
CDB455C16
0.001
muRata
CFU455D2
or
equivalent
Page 4 of 19
Ceramic
Resonator
www.lansdale.com
C15
0.1
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
TYPICAL CURVES
(Unmatched Input)
Figure 4. RSSI versus RF Input
5.0
70
VCC = 4.0 Vdc
RF Input = –30 dBm
fo = 10.7 MHz
4.0
50
3.0
2.0
TA = –30°C
40
TA = 25°C
30
VCC = 4.0 Vdc
fo = 10.7 MHz
20
1.0
10
0
–55
–35
–15
5.0
25
45
85
65
TA, AMBIENT TEMPERATURE (°C)
105
TA = 75°C
0
–140 –120
125
–100
TA = –30°C
–80
–60
–40
Figure 5. RSSI Output versus Temperature
–30 dBm
MIXER OUTPUT (dBm)
VCC = 4.0 Vdc
fo = 10.7 MHz
42
36
30
–70 dBm
24
100 MHz
Desired Products
–10
18
–20
100 MHz
3rd Order Products
–30
–40
–50
12
VCC = 4.0 Vdc
TA = 27°C
–60
6.0
–110 dBm
0
–55
–35
–15
25
45
65
5.0
85
TA, AMBIENT TEMPERATURE (°C)
105
–70
– 70
125
– 60
– 50
– 40
– 30
– 20
– 10
0
10
RF INPUT (dBm)
Figure 7. Mixer Gain versus Supply Voltage
30
27
Figure 8. Mixer Gain versus Frequency
40
TA = 75°C
VCC = 4.0 Vdc
TA = 27°C
RFin = –40 dBm
21
TA = –30°C
MIXER GAIN (dB)
24
RSSI OUTPUT ( µ A)
20
Figure 6. Mixer Output versus RF Input
48
TA = 25°C
18
15
12
fo = 10.7 MHz
RFin –40 dBm
1.8 kΩ Load
9.0
6.0
30
–10 dBm
20
–15 dBm
–20 dBm
10
5.0 dBm
0 dBm
3.0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
0
1.0
–5.0 dBm
10
100
1000
f, FREQUENCY (MHz)
VCC, SUPPLY VOLTAGE (V)
Page 5 of 19
0
0
54
0
–20
RF INPUT (dBm)
60
RSSI OUTPUT ( µ A)
TA = 75°C
60
RSSI OUT (µ A)
THD, TOTAL HARMONIC DISTORTION (%)
Figure 3. Total Harmonic Distortion
versus Temperature
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
ML3371 PIN FUNCTION DESCRIPTION
OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3371 at f RF = 10.7 MHz (see Figure 11).
Pin
Symbol
1
OSC1
Internal Equivalent
Circuit
Description
Waveform
The base of the Colpitts oscillator. Use
a high impedance and low capacitance
probe or a “sniffer” to view the wave–
form without altering the frequency.
Typical level is 450 mVpp.
VCC
1
15 k
OSC1
2
2
OSC2
The emitter of the Colpitts oscillator.
Typical signal level is 200 mVpp. Note
that the signal is somewhat distorted
compared to that on Pin 1.
OSC2
200
µA
3
MXOut
VCC
3
4
MixerOut
Output of the Mixer. Riding on the
455 kHz is the RF carrier component.
The typical level is approximately
60 mVpp.
15k
1.5
4
VCC
Supply Voltage –2.0 to 9.0 Vdc is the
operating range. VCC is decoupled to
ground.
100
µA
5
IFIn
5
IFIn
1.8 k
6
53 k
Input to the IF amplifier after passing
through the 455 kHz ceramic filter. The
signal is attenuated by the filter. The
typical level is approximately
50 mVpp.
DEC1
7
6
7
DEC1
DEC2
8
Quad
Coil
51 k
DEC2
60 µA
8
Quad Coil
VCC
IF Decoupling. External 0.1 µF
capacitors connected to VCC.
Quadrature Tuning Coil. Composite
(not yet demodulated) 455 kHz IF
signal is present. The typical level is
500 mVpp.
10
50 µA
Page 6 of 19
www.lansdale.com
Issue A
ML3371, ML3372
Page 7 of 19
LANSDALE Semiconductor, Inc.
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
ML3371 PIN FUNCTION DESCRIPTION (continued)
OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3371 at f RF = 10.7 MHz (see Figure 11).
Pin
Symbol
13
RSSI
Internal Equivalent
Circuit
VCC
1.8 k
Bias
Description
Waveform
RSSI Output. Referred to as the
Received Signal Strength Indicator or
RSSI. The chip sources up to 60 µA
over the linear 60 dB range. This pin
may be used many ways, such as:
AGC, meter drive and carrier triggered
squelch circuit.
13
RSSIOut
14
MUTE
14 Mute or
SqOut
Mute Output. See discussion in
application text.
40 k
15
Gnd
Gnd
16
MIXIn
Ground. The ground area should be
continuous and unbroken. In a two–
sided layout, the component side has
the ground plane. In a one–sided
layout, the ground plane fills around
the traces on the circuit side of the
board and is not interrupted.
15
VCC
16
Mixer Input –
Series Input Impedance:
@ 10 MHz: 309 – j33 Ω
@ 45 MHz: 200 – j13 Ω
MixerIn
3.3 k
10 k
*Other pins are the same as pins in MC3371.
Page 8 of 19
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
ML3372 PIN FUNCTION DESCRIPTION
OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3372 at f RF = 45 MHz (see Figure 13).
Pin
Symbol
5
IFIn
Internal Equivalent
Circuit
Description
Waveform
IF Amplifier Input
5
IFIn
53 k
6
6
DEC1
DEC
60 µA
7
IFOut
VCC
IF Decoupling. External 0.1 µF
capacitors connected to VCC.
IF Amplifier Output Signal level is
typically 300 mVpp.
7
IFOut
50 µA
120 µA
8
QuadIn
Quadrature Detector Input. Signal
level is typically 150 mVpp.
8
QuadIn
VCC
10
9
50 µA
RA
Recovered Audio. This is a composite
FM demodulated output having signal
and carrier components. Typical level
is 800 mVpp.
VCC
200
9
100 µA
Page 9 of 19
RAOut
The filtered recovered audio has the
carrier signal removed and is typically
500 mVpp.
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Figure 9. ML3371 Circuit Schematic
MixerOut
3
MixerIn
16
4
VCC
Meter Out
13
FilterIn
10
12 Squelch In
1
11
FilterOut
OSC1
2
X
X
Y
OSC2
100
µA
Bias
8
4
10
5
DEC1
Squelch Out
15
Gnd
VCC
1.8 k
6
14
Bias
200 µA
IFIn
–
+
QuadIn
X
Y X
Y
200
9
RAOut
53 k
51 k
7
DEC2
100 µA
Figure 10. ML3372 Circuit Schematic
MixerIn
16
4
VCC
MixerOut
3
Meter Out
13
FilterIn
10
12 Squelch In
1
11
FilterOut
OSC1
2
X
X
Y
OSC2
100
µA
Bias
8
4
QuadIn
10
5
IFIn
IFOut
Squelch Out
15
Gnd
VCC
6
14
Bias
200 µA
DEC
–
+
X
Y X
Y
200
9
RAOut
53 k
7
100 µA
Page 10 of 19
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
CIRCUIT DESCRIPTION
The ML3371 and ML3372 are low power narrowband FM
receivers with an operating frequency of up to 60 MHz. Its low
voltage design provides low power drain, excellent sensitivity,
and good image rejection in narrowband voice and data link
applications.
This part combines a mixer, an IF (intermediate frequency)
limiter with a logarithmic response signal strength indicator, a
quadrature detector, an active filter and a squelch trigger circuit. In a typical application, the mixer amplifier converts an
RF input signal to a 455 kHz IF signal. Passing through an
external bandpass filter, the IF signal is fed into a limiting
amplifier and detection circuit where the audio signal is recovered. A conventional quadrature detector is used.
The absence of an input signal is indicated by the presence of
noise above the desired audio frequencies. This “noise band” is
monitored by an active filter and a detector. A squelch switch is
used to mute the audio when noise or a tone is present. The
input signal level is monitored by a meter drive circuit which
detects the amount of IF signal in the limiting amplifier.
LEGACY APPLICATIONS INFORMATION
The oscillator is an internally biased Colpitts type with the
collector, base, and emitter connections at Pins 4, 1 and 2
respectively. This oscillator can be run under crystal control.
For fundamental mode crystals use crystal characterized parallel resonant for 32 pF load. For higher frequencies, use 3rd
overtone series mode type crystals. The coil (L2) and resistor
RD (R13) are needed to ensure proper and stable operation at
the LO frequency (see Figure 13, 45 MHz application circuit).
The mixer is doubly balanced to reduce spurious radiation.
Conversion gain stated in the AC Electrical Characteristic stable is typically 20 dB. This power gain measurement was made
under stable conditions using a 50 Ω source at the input and an
external load provided by a 455 kHz ceramic filter at the mixer
output which is connected to the VCC (Pin 4) and IF input
(Pin 5). The filter impedance closely matches the1.8 kΩ internal load resistance at Pin 3 (mixer output). Since the input
impedance at Pin 16 is strongly influenced by a 3.3 kΩ internal biasing resistor and has a low capacitance, the useful gain
is actually much higher than shown by the standard power gain
measurement. The Smith Chart plot in Figure 17 shows the
measured mixer input impedance versus input frequency with
the mixer input matched to a 50Ω source impedance at the
given frequencies. In order to assure stable operation under
matched conditions, it is necessary to provide a shunt resistor
to ground. Figures 11, 12 and 13 show the input networks used
to derive the mixer input impedance data.
Following the mixer, a ceramic bandpass filter is recommended for IF filtering (i.e. 455 kHz types having a bandwidth
of ±2.0 kHz to ±15 kHz with an input and output impedance
from 1.5 kΩ to 2.0 kΩ). The 6 stage limiting IF amplifier has
approximately 92 dB of gain. The MC3371 and MC3372 are
Page 11 of 19
different in the limiter and quadrature detector circuits. The
MC3371 has a 1.8 kΩ and a 51 kΩ resistor providing internal
dc biasing and the output of the limiter is internally connected,
both directly and through a 10 pF capacitor to the quadrature
detector; whereas, in the MC3372 these components are not
provided internally. Thus, in the MC3371, no external components are necessary to match the 455 kHz ceramic filter, while
in the MC3372, external 1.8 kΩ and 51 kΩ biasing resistors
are needed between Pins 5 and 7, respectively (see Figures 12
and 13).
In the MC3371, a parallel LCR quadrature tank circuit is
connected externally from Pin 8 to VCC (similar to the
MC3361). In the MC3372, a quadrature capacitor is needed
externally from Pin 7 to Pin 8 and a parallel LC or a ceramic
discriminator with a damping resistor is also needed from Pin
8 to VCC (similar to the MC3357). The above external quadrature circuitry provides 90° phase shift at the IF center frequency and enables recovered audio.
The damping resistor determines the peak separation of the
detector and is somewhat critical. As the resistor is decreased, the
separation and the bandwidth is increased but the recovered
audio is decreased. Receiver sensitivity is dependent on the value
of this resistor and the bandwidth ofthe 455 kHz ceramic filter.
On the chip the composite recovered audio, consisting of
carrier component and modulating signal, is passed through a
low pass filter amplifier to reduce the carrier component and
then is fed to Pin 9 which has an output impedance of 450Ω.
The signal still requires further filtering to eliminate the carrier
component, deemphasis, volume control, and further amplification before driving a loudspeaker. The relative level of the
composite recovered audio signal at Pin 9 should be considered for proper interaction with an audio post amplifier and a
given load element. The MC13060 is recommended as a low
power audio amplifier.
The meter output indicates the strength of the IF level and
the output current is proportional to the logarithm of the IF
input signal amplitude. A maximum source current of 60 µA is
available and can be used to drive a meter and to detect a carrier presence. This is referred to as a Received Strength Signal
Indicator (RSSI). The output at Pin 13 provides a current
source. Thus, a resistor to ground yields a voltage proportional
to the input carrier signal level. The value of this resistor is
estimated by (VCC(Vdc) – 1.0 V)/60 µA; so for VCC = 4.0
Vdc, the resistor is approximately 50 kΩ and provides a maximum voltage swing of about 3.0 V.
A simple inverting op amp has an output at Pin 11 and the
inverting input at Pin 10. The noninverting input is connected
to 2.5 V. The op amp may be used as a noise triggered squelch
or as an active noise filter. The bandpass filter is designed with
external impedance elements to discriminate between frequencies. With an external AM detector, the filtered audio signal is
checked for a tone signal or for the presence of noise above the
normal audio band. This information is applied to Pin 12.
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Legacy Applications Information
An external positive bias to Pin 12 sets up the squelch trigger circuit such that the audio mute (Pin 14) is open or connected to ground. If Pin 12 is pulled down to 0.9 V or below
by the noise or tone detector, Pin 14 is internally shorted to
ground. There is about 57 mV of hyteresis at Pin 12 to prevent
jitter. Audio muting is accomplished by connecting Pin 14 to
the appropriate point in the audio path between Pin 9 and an
audio amplifier. The voltage at Pin 14 should not be lower than
–0.7 V; this can be assured by connecting Pin 14 to the point
that has no DC component.
Another possible application of the squelch switch may be as
a carrier level triggered squelch circuit, similar to the
MC3362/MC3363 FM receivers. In this case the meter output
can be used directly to trigger the squelch switch when the RF
input at the input frequency falls below the desired level. The
level at which this occurs is determined by the resistor placed
between the meter drive output (Pin 13) and ground (Pin 15).
Figure 11b shows a typical application using the
ML145170/ML145170 PLL device to obtain multiple channel
operation.
Figure 11a. Typical Application for ML3371 at 10.7 MHz
V CC = 4.0 Vdc
+
RSSI Output
R2
10 k
1st IF 10.7 MHz
from Input
Front End
C9
10
R3
100 k
C15
91
8.2 µH
L2
+
C2
4.7
µF
L1
TKANS9443HM
6.8 µH ±6%
R11
560
R1
51 k
C1
0.01
R4
1.0 k
D1
1N5817 R5
VR1 (Squelch Control)
10 k
4.7 k R6
C3
0.1
C17
0.1
C4
0.001
C5
0.001
R9
560
R8
R7
3.3 k C7
0.022
4.7 k
VR2
10 k
510 k
16
15
14
13
12
11
Squelch Trigger
with Hysteresis
Mixer
1
Oscillator
2
3
9
10
AF
Filter –
Amp
Amp
+
Demodulator
Limiter
Amp
4
5 1.8 k 6
51 k
10
53 k
7
8
C8
0.22
AF Out
to Audio
Power Amp
C10
10.245
MHz
68
C12
0.1
C11
220
C13
0.1
muRata
CFU455D2
or
equivalent
Page 12 of 19
www.lansdale.com
R10
39 k
T2: Toko
2A6597 HK (10 mm)
or
7MC–8128Z (7 mm)
C14
0.1
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Figure 11b. Typical Application using PLL ML145170 Device Allowing Multiple Channel Operation.
R SSI
V2
5V
+V
C2
1nF
ML3371
L3
1uH
C10
1nF
D2
MV209
xtal
xtalP1
P2
mixoutP3
vcc P4
liminP5
decP6
decP7
quadP8
C3
47pF
L1
1uH
C23
C21
1uF
.1uF
C14
R13
.001uF 4.7k
R14
510k .001uF
C22
P16 mixin
P15 gnd
P14 mute
P13 rssi
P12 sqin
P11 filout
P10 filin
P9 recaudio
51k
R3
P1
R5
100k
D1
1N914
C 11
.1uF
C1
15pF
R15
1k
C4
33pF 33pF
10k
R10
C8
C5
C20
.1uF
R8
10k
R12
3.3kk
R9
3.3k
C12
.22uF
Volume
C13
R2
10k 40%
U1
1uH
L2
C7
.1uF .1uF
R1
20k
C6
150pF
V1
10V
+V
U2
C9
.1uF
455 Khz ceramic filter
P16 Vdd
phsV
P15 phsR
P14
P13 PDout
P12 Vss
P11 LD
P10 Fv
P9 Fr
C19
.1uF
U3
oscinP1
oscout
P2
REFoutP3
FinP4
DinP5
enbP6
clkP7
DoutP8
MC145170
C18
1nF
R7
2.7k
R4
10k 40%
.022uF
cerfil
V3
5V
C15 +V
.1uF
Squelch
R11
4.7k
SPI
J2
XTAL2
1.000MHZ
1Meg
R6
C17
27pF
Page 13 of 19
C16
27pF
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Legacy Applications Information
Figure 12. Typical Application for ML3372 at 10.7 MHz
VCC = 4.0 Vdc
+
RSSI Output
R2
10 k
1st IF 10.7 MHz
from Input
Front End
C9
10
8.2 µH
L2
+
C2
4.7
µF
C16
91
L1
TKANS9443HM
6.8 µH ± 6%
R13
560
R1
51 k
C1
0.01
R4
1.0 k
D1
1N5817 R5
VR1 (Squelch Control)
10 k
4.7 k R6
C3
0.1
C6
0.1
560
C4
0.001
R8
R7
3.3 k C7
0.022
4.7 k
C5
0.001
C8
0.22
R9
16
15
14
13
510 k
10
11
–
Filter
Amp
+
12
Squelch Trigger
with Hysteresis
Oscillator
2
3
Limiter
Amp
4
C10
10.245
MHz
68
5
6
R10
1.8k
C2
220
C12
0.1
10
53 k
7
C13
0.1
R11
51 k
muRata
CFU455D2
or
equivalent
Page 13 of 19
9
AF
Amp
AF Out
to Audio
Power Amp
Demodulator
Mixer
1
VR2
10 k
www.lansdale.com
8
C14
27p
R12
4.3 k
muRata
CDB455C16
C15
0.1
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Legacy Applications Information
Figure 13. Typical Application for ML3372 at 45 MHz
RSSI Output
to Meter (Triplett – 100 kV)
VCC = 4.0 Vdc
+
C9
10
R3
100 k
RF Input
45 MHz C17
120
+
C2
4.7
C18
75
R2
12 k
L1
0.245 µH
Coilcraft
150–07J08
D1
C3
0.1
16
C5
0.001
15
14
13
12
Oscillator
2
3
4
5
6
C10
44.545
MHz
560
R7
R10
1.8 k
C11
5.0
30
L2
0.84 µH
C12
0.1
7
R11
51 k
R12
4.3 k
R13
1.0 k
muRata
CDB455C16
Figure 15. RSSI Output versus RF Input
3.0
RSSI OUTPUT (Vdc)
3.0
2.5
2.0
fRF = 10.7 MHz
VCC = 4.0 Vdc
Reference Figure 11
1.0
AF Out
to Audio
Power Amp
C15
0.1
3.5
1.5
VR2
10 k
C14
27
Figure 14. RSSI Output versus RF Input
RSSI OUTPUT (Vdc)
C8
0.22
C7
0.022
C13
0.1
3.5
0.5
Page 14 of 19
3.3 k
8
muRata
CFU455D2
or
equivalent
0
–120
R8
4.7 k
R9
Mixer
1
VR1 (Squelch Control)
10 k
510 k
11
10
9
–
AF
Filter
Amp
Amp
+
Demodulator
10
Limiter
Amp
53 k
Squelch Trigger
with Hysteresis
Coilcraft
143–13J12
C4
0.001
R1
470
C1
0.01
C16
0.01
1N5817 R5
4.7 k R6
C6
0.1
R14
51 k
R4
1.0 k
2.5
2.0
1.5
fRF = 45 MHz
VCC = 4.0 Vdc
Reference Figure 13
1.0
0.5
–100
–80
–60
–40
–20
0
–120
www.lansdale.com
–100
–80
–60
RF INPUT (dBm)
–40
–20
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Legacy Applications Information
Figure 16. S + N, N, AMR versus Input
10
S+N
S + N, N, AMR (dB)
0
–10
fRF = 10.7 MHz
VCC = 4.0 V
TA = 25°C
–20
–30
S + N 30% AM
–40
–50
N
–60
–130
–110
–90
–70
–50
–30
–10
RF INPUT (dBm)
* Reference Figures 11, 12 and 13
Figure 17. Mixer Input Impedance versus Frequency
+j50
+j25
+j100
+j150
+j10
VCC = 4.0 Vdc
RF Input = –40 dBm
+j250
+j500
0
10
25
50
100
150
250
500
45 MHz 10.7 MHz
–j500
–j250
–j10
–j150
–j100
–j25
–j50
Page 15 of 19
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Legacy Applications Information
Figure 18. MC3371 PC Board Component View with Matched Input at 10.7 MHz
COMPONENT SIDE
VCC GND
CUT
.325
C9
J3
C14
CFU
VCC
455D 2
C13 C12
R10
J2
C10
BNC
MC3371
IF 10.7 MHZ
FRONT END
MC3371
VR2
R8
CUT
.325
GND
C11
T2
AF OUT
+
XTAL
10.245
MHZ
J1
C16
C15
INPUT IF
10.7 MHZ
C1
C2
C R9
C3
C8
R7 5
C7
C4
D1
R6
R5
VR1
R3
R2
J3
L2
+
R11 L1
J4
CUT
.325
R4
R1
C17
BNC
METER
OUT
VCC
Figure 19. MC3371 PC Board Circuit or Solder Side as Viewed through Component Side
SOLDER SIDE
Above PC Board is laid out for the circuit in Figure 11.
Page 16 of 19
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
Legacy Applications Information
Figure 20. MC3372P PC Board Component View with Matched Input at 10.7 MHz
COMPONENT SIDE
VCC GND
CUT
.325
C9
BNC
GND
R10
VCC
C11
CFU455D2
C
INPUT IF
C10
XTAL
1
CDB
10.7 MHZ
10.245
3
455
MHZ
C16
J1
C17
C14 R12
J2
MC3372
C16
VR2
C1
R8
R9
BNC
C2 L2
C
+
C3
C8
L1
5
R13
C7 R7
C4
J4 CUT
D1
R6
.325
R5
R4
C6 R1 METER
VR1
R3
OUT
R2
J3
C15
AF OUT
+
CUT
.325
R
1
1
C12
MC3372
IF 10.7 MHZ
FRONT END
J3
VCC
Figure 21. MC3372P PC Board Circuit or Solder Side as Viewed through Component Side
SOLDER SIDE
Above PC Board is laid out for the circuit in Figure 12.
Page 17 of 19
www.lansdale.com
Issue A
ML3371, ML3372
LANSDALE Semiconductor, Inc.
OUTLINE DIMENSIONS
P DIP 16 = EP
PLASTIC PACKAGE
(ML3371EP, ML3372EP)
CASE 648–08
ISSUE R
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
–A–
16
9
1
8
B
F
C
L
S
SEATING
PLANE
–T–
K
H
G
D
M
J
16 PL
0.25 (0.010)
M
T A
M
16
9
1
8
–B–
P
8 PL
0.25 (0.010)
M
B
R
K
S
F
X 45
C
SEATING
PLANE
M
16 PL
0.25 (0.010)
MILLIMETERS
MIN
MAX
18.80
19.55
6.35
6.85
3.69
4.44
0.39
0.53
1.02
1.77
2.54 BSC
1.27 BSC
0.21
0.38
2.80
3.30
7.50
7.74
0
10
0.51
1.01
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
G
D
INCHES
MIN
MAX
0.740
0.770
0.250
0.270
0.145
0.175
0.015
0.021
0.040
0.70
0.100 BSC
0.050 BSC
0.008
0.015
0.110
0.130
0.295
0.305
0
10
0.020
0.040
SO 16 = -5P
PLASTIC PACKAGE
(ML3371-5P, ML3372-5P)
CASE 751B–05
(SO–16)
ISSUE J
–A–
–T–
DIM
A
B
C
D
F
G
H
J
K
L
M
S
M
T B
S
A
S
J
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
9.80
10.00
3.80
4.00
1.35
1.75
0.35
0.49
0.40
1.25
1.27 BSC
0.19
0.25
0.10
0.25
0
7
5.80
6.20
0.25
0.50
INCHES
MIN
MAX
0.386
0.393
0.150
0.157
0.054
0.068
0.014
0.019
0.016
0.049
0.050 BSC
0.008
0.009
0.004
0.009
0
7
0.229
0.244
0.010
0.019
Lansdale Semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Lansdale does not assume any liability arising out of the application or use of any product or circuit
described herein; neither does it convey any license under its patent rights nor the rights of others. “Typical” parameters which
may be provided in Lansdale data sheets and/or specifications can vary in different applications, and actual performance may
vary over time. All operating parameters, including “Typicals” must be validated for each customer application by the customer’s
technical experts. Lansdale Semiconductor is a registered trademark of Lansdale Semiconductor, Inc.
Page 19 of 19
www.lansdale.com
Issue A