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PDF NS741 Data sheet ( Hoja de datos )
| Número de pieza | NS741 | |
| Descripción | Low Power FM Band Transmitter | |
| Fabricantes | Niigata Seimitsu | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NS741 (archivo pdf) en la parte inferior de esta página. Total 2 Páginas | ||
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www.DataSheet4U.com
Engineering Division
TEL:+81-3-3437-3570 FAX:+81-3-3437-5622
http://www.niigata-s.co.jp
06/09/25 P. 1/2
NS741 Catalog
NS741 is the low-power FM band transmitter with which the left and right audio signals can be modulated in
FM with stereo multiplexing.
Features:
Chip Description:
Transmitting frequency coverage: 76.1 to 108.0 MHz
NS741 is the low-power FM band transmitter which
enables the RDS (Radio Data System) data
transmission. It is manufactured by full CMOS
Stereo modulation
Direct Frequency Modulation
RDS transmission, available
process. The built-in DSP realizes stable stereo
signal generation and RDS data attachment. The
direct modulation (the modulation by directly
providing the audio signal to the MOS varactor
which constitutes the resonant circuit of the local
oscillation circuit) is employed. I2C or 3-wire can be
ALC (Automatic Level Control) function in Analog
input
Less external components
Crystal oscillator: 32.768kHz
External reference frequency input, available
(19.2 and 32.768 kHz)
applied to the interface with CPU.
Applications:
Wireless microphone
Portable CD and MP-3
Mobile phone
Note: Set the transmission output based on the law,
regulations, etc. of respective areas.
Built-in MOS Varactor for local oscillator
Modulation index, adjustable by MPU
I2C bus or 3-wire serial interface with MPU
Easy control of software programming
Operating Voltage: 2.7 to3.6V (3.0V typ.)
Low Power Consumption: 17mA (typ.)
Operating Temperature: -30 to +85 degC
Package: 35-pin Wafer Level Package and
36-pin QFN Package
Full CMOS process
RF output program, variable (APC)
Electrical Specification:
Operating Range
Parameter
Sym
Condition
Min Typ Max Unit
Operating voltage
VDD
2.7 3.0 3.6 V
VEX
1.7 1.8 3.6 V
Operating temperature
Ta
-30 +85 degC
Storage temperature
Tstg
-40 +125 degC
Electrical Performance
Unless otherwise specified, conditions are: VDD: 3.0+/-0.05V, Ta: 25degC, f-AF: 400Hz, Vi-AF: 140mVrms, ALC: Off, fo: 88MHz.
Parameter
Sym
Condition
Min Typ Max Unit
Consumption current
Idd
VDD: 3.0V
PO: RFG=0
- 17 27 mA
Standby current
Istb VDD: 3.6V
- - 20 uA
Transmission frequency
fTX
76.1 - 108.0 MHz
RFG: 0
-7 -2 1
Transmission power output
PO
Rl:
50-ohm
RFG: 1
RFG: 2
-3
-1
0
2
3
5
dBm
RFG: 3
1 47
Modulation deviation
Pre-emphasis: ON
Dev Mono
+/-60 +/-75 +/-100 kHz
ALC: OFF
Stereo
Modulation distortion
THD Dev: +/-75kHz
ALC: OFF
- - 1.5 %
Modulation SN ratio
SNR
Mono and Stereo
ALC: OFF
47 53 -
dB
Stereo separation
SEP
Dev: +/-75kHz
ALC: OFF
25 30 -
dB
Audio frequency response
FR
f = 50 to 15kHz
VIN=18 mVrms
-3 0 +3 dB
Audio input impedance
Zaf
f = 50 to 15kHz
VIN=18mVrms
100 -
- k ohm
Pilot tone level
PL
10 %
RDS level
RDS
2 kHz
Frequency
fXT
32.768
kHz
Crystal oscillator Absolute tolerance
dXT
Ta: -30 to 85degC
VDD: 2.7 to 3.6V
-20
+20 ppm
Confidential
Subject to change without notice
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet NS741.PDF ] | |
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