LA1193M Sanyo Semicon Device, LA1193M Datasheet - Page 11

• Manufacturer Part Number: LA1193M
• Description: High-Performance FM Front End for Car Radios
• Manufacturer: Sanyo Semicon Device

4. Mixer
Note: * Mixer input IMQS is defined as follows:
5. IF Amplifier
The mixer circuit used in this IC is a balanced input/balanced output double balance mixer circuit.
• Input Format
This IF amplifier is a single stage differential amplifier.
Specifications
Gain adjustment can be provided using either of
the methods shown.
Temperature Characteristics
The LA1193M/V uses Vref temperature characteristics correction to hold the gain temperature characteristics to the
low level of about 1 dB over the range –30 to +80°C.
Emitter input
Input impedance: 25 Ω
Optimization of the component geometry, emitter
current and bias allow this circuit to achieve the
following performance.
Mixer input usable sensitivity: 15 dBµ
Mixer input IMQS*: 90.5 dBµ
Input impedance:
Output impedance: 330 Ω
Gain:
f r = 98.8 MHz, no input
f u1 = 98.8 MHz, 1 kHz, 30% modulation
f u2 = 99.6 MHz, no modulation
IF Gain adj
330 Ω
25 dB
LA1193M, 1193V
IMQS is the interference 1 and 2 input levels such that when an
interference signal with the same level is input to the mixer and
distortion occurs at the mixer, the generated IM output has a S/N
ratio of 30 dB.
(Improved by 6.0 dBµ over previous products.)
Figure 4 Mixer Circuit
No. 4715-11/21