MAGNESPEC INC 13175

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Technical Document


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www.lansdale.com
ML13175
ML13176
UHF FM/AM Transmitter
Page 1 of 16
Legacy Device: Motorola MC13175, MC13176
The ML13175 and ML13176 are one chip FM/AM transmitter subsys-
tems designed for AM/FM communication systems. they include a
Colpitts crystal reference oscillator, UHF oscillator, ÷ 8 (ML13175) or
÷ 32 (ML13176) prescaler and phase detector forming a versatile PLL
system. Targeted applications are in the 260 to 470MHz band and 902
to 982 MHz band covered by FCC Title 47; Part 15. Other applica-
tions include local oscillator sources in UHF and 900 MHz receivers,
UHF and 900 MHz video transmitters, RF Local Area Networks
(LAN), and high frequency clock drivers. ML13175/76 offer the fol-
lowing features;
• UHF Current Controlled Oscillator
• Uses Easily Available 3rd Overtone or Fundamental Crystals
for Reference
• Fewer External Parts Required
• Low Operating Supply Voltage (1.8 to 5.0 Vdc)
• Low Supply Drain Currents
• Power Output Adjustable (Up to + 10 dBm )
• Differential Output for Loop Antenna or Balun
Transformer Networks
• Power Down Feature
ASK Modulated by Switching Output On and Off
• (ML13175) f
o
= 8 x f
ref
, (ML13176) f
o
= 32 x f
ref
• Operating Temperature Range - T
A
= -40° to +85°C
ML13175-5P
PLASTIC PACKAGE
CASE 751B
(SO–16)
16
1
CROSS REFERENCE/ORDERING INFORMATION
MOTOROLA
SO 16 MC13175D ML13175-5P
SO 16 MC13176D ML13176-5P
LANSDALEPACKAGE
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
PIN CONNECTIONS
8
7
6
5
4
3
2
1
9
10
11
12
13
14
15
16
Xtale
PD
out
I
Cont
V
EE
NC
Osc 4
NC
Osc 1
Xtalb
Reg.
Gnd
Enable
V
CC
Out 1
Out 2
Out
Gnd
I
mod
Figure 1. Typical Application as 320 MHz AM Transmitter
1. 50 coaxial balun, 1/10 wavelength at 320 MHz equals 1.5 inches.
2. Pins 5, 10 & 15 are ground and connected to V
EE
which is the component/DC ground plane
2. side of PCB. These pins must be decoupled to V
CC
; decoupling capacitors should be placed
2. as close as possible to the pins.
3. The crystal oscillator circuit may be adjusted for frequency with the variable inductor
3. (ML13175); recommended source is Coilcraft “slot seven” 7mm tuneable inductor, Part
3. #7M3–821. 1.0k resistor. Shunting the crystal prevents it from oscillating in the fundamental
3. mode.
8
7
6
5
4
3
2
1
Osc
Tank
Coilcraft
150–05J08
0.165
µ
(2)
V
EE
0.1
µ
1.0k
150p
f/N
ML13175
Crystal
3rd Overtone
40.0000 MHz
27k
V
CC
RFC
1
150p
Z = 50
(1)
9
10
11
12
13
14
15
16
RF
out
1.3k
AM Modulator
100p
(ML13176)
V
CC
30p
(ML13175)
ML13175–30p
ML13176–180p
0.82
µ
1.0k
0.01
µ
ML13176
Crystal
Fundamental
10 MHz
(3)
V
CC
0.01
µ
V
EE
SMA
S
1
V
EE
0.1
µ
S
2
NOTES:
Issue CcC
ML13175/ML13176 LANSDALE Semiconductor, Inc.
MAXIMUM RATINGS
( T
A
= 25 C, unless otherwise noted.)
Rating Symbol Value Unit
Power Supply Voltage V
CC
7.0 (max) Vdc
Operating Supply Voltage Range V
CC
1.8 to 5.0 Vdc
Junction Temperature T
J
+150 C
Operating Ambient Temperature T
A
– 40 to + 85 C
Storage Temperature
T
stg
– 65 to +150 C
ELECTRICAL CHARACTERISTICS (Figure 2; V
EE
= – 3.0 Vdc, T
A
= 25 C, unless otherwise noted.)*
Characteristic
Pin Symbol Min Ty p Max Unit
Supply Current (Power down: I
11
& I
16
= 0) I
EE1
– 0.5 µA
Supply Current (Enable [Pin 11] to V
CC
thru 30 k, I
16
= 0) I
EE2
–14 mA
Total Supply Current (Transmit Mode)
(I
mod
= 2.0 mA; f
o
= 320 MHz)
I
EE3
–34 mA
Differential Output Power (f
o
= 320 MHz; V
ref
[Pin 9]
= 500 mV
p–p
; f
o
= N x f
ref
)
I
mod
= 2.0 mA (see Figure 7, 8)
I
mod
= 0 mA
13 & 14 P
out
2.0
+ 4.7
–45
dBm
Hold–in Range (±∆f
ref
x N)
ML13175 (see Figure 7)
ML13176 (see Figure 8)
13 & 14 ±∆f
H
3.5
4.0
6.5
8.0
MHz
Phase Detector Output Error Current
ML13175
ML13176
7 l
error
20
22
25
27
µA
Oscillator Enable Time (see Figure 22b) 11 & 8 t
enable
4.0 ms
Amplitude Modulation Bandwidth (see Figure 24) 16 BW
AM
25 MHz
Spurious Outputs (I
mod
= 2.0 mA)
Spurious Outputs (I
mod
= 0 mA)
13 & 14
13 & 14
P
son
P
soff
–50
–50
dBc
Maximum Divider Input Frequency
Maximum Output Frequency
13 & 14
f
div
f
o
950
950
MHz
* For testing purposes, V
CC
is ground (see Figure 2).
Figure 2. 320 MHz Test Circuit
NOTES: 1. V
CC
is ground; while V
EE
is negative with respect to ground.
2. Pins 5, 10 and 15 are brought to the circuit side of the PCB via plated through holes.
They are connected together with a trace on the PCB and each Pin is decoupled to V
CC
(ground).
3. Recommended source is Coilcraft “slot seven inductor part number 7M3–821.
8
7
6
5
4
3
2
1
Osc
Tank
Coilcraft
150–03J0
8
0.098
µ
V
EE
(1)
0.1
µ
27p
f/N
ML13175
Crystal
3rd Overtone
40 MHz
30k
V
CC
9
10
11
12
13
14
15
16
10k
I
mod
15p
(ML13176)
10p
(ML13175)
ML13175–30p
ML13176–33p
0.82
µ
1.0k
0.01
µ
ML13176
Crystal
Fundamental
10 MHz
(3)
V
CC
0.1
µ
0.1
µ
10k
2.2k
I
reg.
enable
(1)
0.01
µ
RF
out
1
51
51
0.1
µ
0.01
µ
RF
out
2
www.lansdale.comPage 2 of 16
–18
–39
IssueC Cc
LANSDALE Semiconductor, Inc. ML13175/ML13176
PIN FUNCTION DESCRIPTIONS
Pin Symbol
Internal Equivalent
Circuit
Description/External
Circuit Requirements
1 & 4 Osc 1,
Osc 4
1
0sc 1
10k
4
Osc 4
10k
V
CC
CCO Inputs
The oscillator is a current controlled type. An external oscillator
coil is connected to Pins 1 and 4 which forms a parallel
resonance LC tank circuit with the internal capacitance of the
IC and with parasitic capacitance of the PC board. Three
base–emitter capacitances in series configuration form the
capacitance for the parallel tank. These are the base–emitters
at Pins 1 and 4 and the base–emitter of the differential amplifier.
The equivalent series capacitance in the differential amplifier is
varied by the modulating current from the frequency control
circuit (see Pin 6, internal circuit). A more thorough discussion
is found in the Applications Information section.
5 V
EE
V
EE
V
EE
V
EE
5
Subcon
Supply Ground (V
EE
)
In the PCB layout, the ground pins (also applies to Pins 10 and
15) should be connected directly to chassis ground. Decoupling
capacitors to V
CC
should be placed directly at
the ground returns.
6 I
Cont
I
Cont
6
Reg
V
CC
Frequency Control
For V
CC
= 3.0 Vdc, the voltage at Pin 6 is approximately 1.55
Vdc. The oscillator is current controlled by the error current from
the phase detector. This current is amplified to drive the current
source in the oscillator section which controls the frequency of
the oscillator. Figures 9 and 10 show the f
osc
versus I
Cont
,
Figure 5 shows the f
osc
versus I
Cont
at – 40°C, + 25°C and
+85°C for 320 MHz. The CCO may be FM modulated as shown
in Figure 17, ML13176 320 MHz FM Transmitter. A detailed
discussion is found in the Applications Information section.
7 PD
out
4.0k
V
CC
4.0k
7
PD
out
Phase Detector Output
The phase detector provides ± 30 µA to keep the CCO locked at
the desired carrier frequency. The output impedance of the
phase detector is approximately 53 k. Under closed loop
conditions there is a DC voltage which is dependent upon the
free running oscillator and the reference oscillator frequencies.
The circuitry between Pins 7 and 6 should be selected for
adequate loop filtering necessary to stabilize and filter the loop
response. Low pass filtering between Pin 7 and 6 is needed so
that the corner frequency is well below the sum of the divider
and the reference oscillator frequencies, but high enough to
allow for fast response to keep the loop locked. Refer to the
Applications Information section regarding loop filtering and FM
modulation.
www.lansdale.comPage 3 of 16 Issue Cc
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