LA1235 Sanyo Semiconductor Corporation, LA1235 Datasheet
LA1235
Available stocks
Related parts for LA1235
LA1235 Summary of contents
Page 1
... LA1235 Overview The LA1235 is a high integrated IC developed for use in high S/N, low distortion FM IF system applications. This IC features S/N = 88dB, distortion factor = 0.015% and has almost all functions required for FM tuner IF stage. The IF amplifier and limiter stage consist of 6 stages of double ended differential amplifier having an excellent AMR, and this stage is followd by the signal meter driver which consists of 4 stages of level detector, thereby creating extended linearity up to strong input ...
Page 2
... Detection output S/N −3dB limiting sensitivity Muting sensitivity Muting attenuation Muting bandwidth Muting driving output Total harmonic distortion AM supperssion ratio Signal meter driving output Offset voltage Tuning meter null voltage IF-off voltage LA1235 Symbol Conditions V CC max Pin Pins Pin Pin Pin 10 ...
Page 3
... Package Dimensions unit : mm (typ) 3006C Reference Pin Voltage Pin No. Condition Quiescent V10 V12 V13 V15 V16 LA1235 Pin voltage (V) 2.6 6.2 5.9 6.2 0 No. 873- 3/13 ...
Page 4
... From the above, the minimum value for muting setting (muting ON input) becomes 50dBµ for R (semifixed resistor) = 50kΩ and R LA1235 Muting sensitivity setting by means of R 204 and R 204 205 ...
Page 5
... ON does not exceed 0.35mA. When driving the muting circuit of the LA1235, the muting drive current (input current at pin 5) must be considered besides this total output current. The muting drive current of the LA1235 is 0.2mA max. ...
Page 6
... C 110 between pin 7 and ground also exerts influence. The relation between muting attenuation and C 110 is such that if C 110 = 2.2µF and C 112 = 220µF, attenuation at modulation frequency 100Hz becomes −80dB. AF Output Circuit LA1235 No. 873- 6/13 ...
Page 7
... LA1235 10kΩ Mute input 2.2µ Output + 33pF 2.2µF 0.047µF 820Ω 8 6.8kΩ LA1235 T Meter 9 16 1µF 0.047µF 0.047µF 4.7 1µF kΩ + Coil 235S01 68kΩ 2.2µH L1 3.3kΩ ...
Page 8
... Coil specifications Supplier Coil name Sumida 235S01 SNY-074-1919A Q228CEL-1077B Toko LA1235 If decreased Causes matching wigh circuit of preceding stage. Current drain increases. (Observe max. rating). Muting sensitivity shifts to weak input side. Large hysteresis. Insufficient drive of detuning muting. Abnormal detuning muting attenuation waveform and abnormal sound at the time of low frequency modulation ...
Page 9
... Resistance between pin 7 and 10 kΩ ∆ −200 −100 0 100 −1 − 600 550 500 450 400 350 300 −40 − Ambient temperature °C LA1235 10 0 −20 6 −40 −60 4 −80 2 −100 −120 0 120 140 0 1 JK123513 −300 −200 Detuning frequency, ∆f -- kHz JK123515 ...
Page 10
... Ambient temperature ° −40 − Ambient temperature °C LA1235 1.0 0.8 0.6 0.4 0.2 0 −40 − Ambient temperature °C JK123521 Tuning Error -- Ta 10.73 10.72 10.71 10.70 10.69 10.68 10.67 −40 − Ambient temperature °C ...
Page 11
... Supply voltage (mute (lim Supply voltage Supply voltage LA1235 100 120 140 0 20 JK123529 600 230 550 220 500 210 450 200 400 190 350 180 300 170 JK123531 10.73 10.72 10.71 10.70 10.69 10.68 10.67 ...
Page 12
... F.E 0.047µF 10.7 MX (Murata) −40 to 45dB −4dB Front end gain distribution LA1235 2.2µH 0.047µF 11 330Ω 1 0.047µF 2 LA1235 3 0.047µ voltage drive type 56kΩ S meter 50kΩ 30kΩ 0.022µF 3.3kΩ 235S01 (Sumida) 220µF ...
Page 13
... SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of May, 2008. Specifications and information herein are subject to change without notice. LA1235 INPUT-Characteristics − ...