—
OrdeFthis data sheet by MC2831ND
--
1
——”.——. —— ——
LOW POWER FM TRANSMITTER SYST&M
The iMC28W Ais aone-cttip FM transmitter subsystem designed
fo{ cordless telepho[?e and FM communication equipment. it
includes aMicrophone Amplifier, Pilot “rone Oscillator, Voltage
Controlled Oscillato’r and BaWery Monitor.
Wde Raige of operating Supply Voltage{S.a‘(?-8.0V]
Low Drai; Curre!]t (4.0 mA Typ Ftil! Operation at
v~~. =4.0v)
BaReq Checker (290 WA Typ at VCC =4,0 V]
Low Number of External Parts Required
MC2831A
—-— —.—.—-— ___ 1
FiGURE 1—FUNCWONAL BLWK D!AGWM
1
2
3
4
5
6
1 1
,,:’>
74
13
PSUFFIX
PLASTICPACYAGE
CF~SE646-U6
DstiFFlx
PMSTl~; PACWGE
CASE 751B-03
S0-16
-—..——— _-—————
?. ’..
.
flGURE 2—TEST URCU~
0.0047 [
4P’
=
Mod In 3
I
q
0.01
VCC2 +4
47JI
Mic Amp In -5
6.8 k
220 k
Mic Amp out
1
6
Tone Switch 7
I
Tone Output 48
.!, &VCC =3.0 Vto 8.0 V
NOTES:
S1 is anormally closed push button tvpe switch,
The c~stal used is fundamental mode, calibrated for parallel resonance
with a 32 pF load. The 49.7 MHz output is generated in the output buffer,
which generates useful harmonics to 60 MHz.
The network on the output at Pin 14 provides output tuning and imped-
ance matching to 500 at 49.7 MHz. Harmonics are suppressed bv more
than 25 dB. ,,
@MO~R06A
Batte~ checker circuit (Pins 10, 11) is not used in this application.
All capacitors in microfarads, inductors in Henries and reaiators in
Ohms, unless otherwise specified,
Semiconductors
ELECTRICALCHARACTERISTICS (Vccl =4.o Vdc, VCC2 =4.0 Vdc, TA =25”C, unless othewise noted)
Charatieristic Symbol Pin Min Typ Max Unit
Drain Current Iccl 12 150 290 420 “PA
Drain Current ICC2 42.2 3.6 6.5 mA
BATTERY CHECKER
Threshold Voltage (LED Off aOn) VTB 11 1.0 1.2 1.4 .:’.,,.
V*.:$$$
Output Saturation Voltage VOSAT 10 —0.15
(Pin 11 =OV, Pin 10 Sink Current =5.0 mA) 0.5 ~;’’yy?~
,,,, ,t,
:~,.\\.>,,:*<,*$j,
,*.,,,.,
MIC AMPLIFIER .,,,,,.-...:.
,* .,\,,>3$
,,>\,,,../+. “,
.,,,.
Voltage Gain, Closed Loop —5, 627 30 :q>qig:+$’ ~~dB
(Vin =1.0 mVrms, fin =1.0 kHz) ,,,$,~.$,::>,~q.~-
:.+:,>+
Output dc Voltage !..
—61.1 l.~~ ‘*;:” 1.7 Vdc
Output Swing (Vin =30 mVrms, fin =1.0 kHz) —60.8 .,,.2$3$$8 1.6 Vp-p
..%*>.:
Total Harmonic Distortion THD 0/0
(VO =31 mVrms, fin =1.0 kHz)
PILOT TONE OSCILLATOR (250 QLOADING) ‘~!.i:,
.~\+>\:?.
*.e~,,~
Output AF Voltage (f. =5.0 kHz) ~~j.\,!..,:.s$,,
—8~i~.$::;\J- 50 —mVrms
Output dc Voltage —~y .,$*:,J
*$ —1.4 —Vdc
Total Harmonic Distortion —,?* ‘K;, –1.8 5.0 0/0
(f. =5.0 kHz, VAF =150 mVrms) ,.,..,.
~+,!{,:”y~
..,-,..
Tone Switch Threshold ;\Wi ,.?7
+~ \1.1 1.4 1.7
-. Vdc
FM MODULATOR (120 ~LOADING] f($,.$r~~!;...:\.\.\.
..’:.,,.\ \\:J
s+.:>.,,,~:.<,,~,,,&<.
.....
Output RF Voltage (f. =16,6 MHz) ,, VRFO 14 —40 —mVrms
Output dc Voltage .> ~’
*htl}\~:\—14 —1.3 —
>,.. Vdc
Modulation Sensitivity (Note 1) ~..’>.
‘LJ+*.L
~1~*
,.., —3, 14 6.0 10 18 HtimVdc
(Vin =1.0 V=0.2 V) -:.+.?::,:?:’..$l:,.
.i~ !,!,.,
,,~’ ~,>++,>
.{,,*...,
Maximum Deviation (Note 1) ..:~:t}~>J,~::~’ —3, 14 *2.5 t5.0 k12.5
.:\.,$:*$*.. kHz
(Vin =OVtO +2.0 V) ,<\*h.:.,1~,,
,,,;,,3,,:/,,~~
.. >...‘.....
~,~-+*.
RF Frequency Range ‘“l$;+
~L*>:,, —14 — —
:..1 60 MHz
,.
Note 1. Modulation sensitivity and maxim@ ”d~$~%*ionare measured at 49.815 MHz, which is the third harmonic of the crystal frequency,
@M-ROLA Semicondutiors
OUTLINE DIMENSIONS
NOTES:
1. LEAOSWITHIN 013 mm (0.0051RADIUSOFTRUE
POSITIONATSEATINGPLANEATMNIMUM
MATSRIALCONOITION.
10
m
.+!*
-B- P0.25(0.010) @IB@[
..-
Y14,5M,1982. ...., }*
,.: *,:,,. ,.,,$$
3CONTROLLINGOIWqS@N’wLIMETSR.
4. OIMENSIONA~ND &~iNOT INCLUOEMOLO
PROTRUSIO~$’
w---–J tI‘r’ 5. MMIMU~~O%.PROTRUSION 0.15(0.~1 bI1,42 I1,/3 I1
. . . . . .. .
.—y_~_. _u _ u_u_u —?,* .,
t
.4
JnL .,W , , ,’. ,“,” ,“ ,V,W.
++R X45” ~!J\ 4YJ3,,3.?~ G1.27BSC I0.050BSC
,,
[+1025[0.010)@l TIB @lA O{
DSUFFIX
P~STIC PAC~GE
CASE 751 B-03
(S0-16)
ROJA =135”CW m.
-@ M-ROLA Semicondutiwm S.A.
AVENUE GkN~RAL-EISENHOWER -31023 TOULOUSS ~tiX -FRANCE
