
UTC 6610 CMOS IC
33
IF70k
ISD
Select IF offset in FM mode. H:70kHz, L:10.7kHz
PAD NO.
SYMBOL
I/O
34
NC
No connection
35
RANGE
ISU
For frequency counting mode only, Range = H or L, gate time = 0.1S
36
AM/FM-SEL
ISU
AM/FM mode selection. High for AM and low for FM, internal pull-up.
37
AV
DD
Analog Supply voltage
38
AM
IN
AM signal input, 0.3V peak to peak, 500kHz to 30MHz.
39
AV
SS
Analog Ground pin.
40
FM
IN
FM signal input, 0.3V peak to peak, 11-150MHz.
Note: I : Oscillator Input Pad
O: Oscillator Output Pad
ISU: Schmitt trigger input pad with pull-up
D10: Open Drain with 10mA output driving
ISD: Schmitt trigger input pad with pull-down
O4: Push-pull output pad with 4mA driving
OL: LCD segment and common output pad
FUNCTIONAL DESCRIPTION
1. RADIO FREQUENCY DISPLAY OPERATION (DTS MODE):
The FM and AM local oscillator output generated from the external RF receiver enters a high gain input
comparator through the FM
IN
and the AM
IN
pins respectively. The FM signal then routes through a divide-by-
10
dynamic pre-scalar. Depending on the state of the AM/FM-SEL pin, the FM and AM signal will be selected and
enters the IF frequency offset block. Depending on the FM/AM selection, 10.7MHz/70kHz or 455kHz
I.F.frequency will be subtracted or added from the input signal.
LCD DISPLAY RANGE:
MODE
RANGE
DISPLAY RANGE (ON LCD)
FM
L
11.00 MHz to 149.9 kHz
AM
H
L
0.5 MHz to 29.99 MHz
Note:1 When counter frequency overflow, MSB will not be displayed.
IF OFFSET FOR DIFFERENT APPLICATION:
IF70K
AM/FM-SEL
IF Offset
0
0
+10.7MHz
Display FM input frequency 10.7MHz
0
1
+455kHz
Display AM input frequency 455kHz
1
0
-70 kHz*
Display FM input frequency +70kHz
1
1
+455kHz
Display AM input frequency 455kHz
* Suitable to use with TDA7088.
2. CLOCK FUNCTION:
(1) The clock will be advanced in the following flow:
PM 12:00
→
PM 11:59
→
AM 12:00
→
11:59
(2) The [:] sign is the second indicator and will blink at a rate of 2Hz
(3) TIME SETTING:
-- Pressing the keys combination of [TIME SET] [HR SET] or [TIME SET] [MIN SET] will enter the time
setting mode.
-- One digit will be incremented after entering the alarm setting mode. Keep pressing the keys
combination for more than 0.5 seconds will make the digit to be advanced at a rate of 2Hz.
(4) ALARM TIME SETTING:
-- Pressing the keys combination of [AL DISP] [HR SET] or [AL DISP] [MIN SET] will enter the alarm time
setting mode. The [AL] indicator will turn on and the [:] sign will stop blinking.
-- One digit will be incremented after entering the alarm setting mode. Keep pressing the keys combination
UTC
UNISONIC TECHNOLOGIES CO. LTD
5
QW-R502-011,A
DESCRIPTION
STEP
10kHz
100kHz
1kHz
10kHz
RESOULTION
1kHz
10kHz
100kHz
1kHz
H
11.00 MHz to 99.99 MHz
500 kHz to 9999 kHz
Operation