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| ICs for Telephone AN6123MS Speech network IC with ALC s Overview The AN6123MS is an ALC IC for level control of audio signal (300 Hz to 3 kHz). Adopting a mini 5-pin package, mounting on a small area is possible. 1.9 0.1 0.95 1 0.95 2 0.1 to 0.3 0.10 0.16 + 0.06 - 0.25 1.5 + 0.05 - 0.2 2.8 + 0.3 - Unit: mm 0.65 0.15 s Features * Wide supply voltage operation range of VCC = 2.4 V to 6.0 V * Small current consumption of ICC = 500 A * Reduction of a bad effect by the external noise thanks to a package for a rear side mounting. 5 4 0.3 0.2 2.9 + 0.05 - 3 0.4 0.2 0.2 1.1 + 0.1 - + 0.1 - 0.05 1.45 0.1 * Cordless telephone, PDC, PHS telephone MINI-5D s Block Diagram Input Output GND 3 4 DET gm DET 2 VCC 1 5 0 to 0.1 s Applications 0.8 0.65 0.15 1 AN6213MS s Pin Descriptions Pin No. 1 2 3 4 5 VCC DET Input GND Output Description Supply voltage pin Detection pin Signal input pin Grounding pin Signal output pin ICs for Telephone s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature * * Symbol VCC ICC PD Topr Tstg Rating 6.5 3.0 19.5 -20 to +75 -55 to +125 Unit V mA mW C C Note) *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 2.4 to 6.0 Unit V s Electrical Characteristics at VCC = 3.0 V, f = 1 kHz, Ta = 25C Parameter Operating current * Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Symbol ICC Conditions Without signal input Min Typ 450 Max 900 Unit A Parameter Voltage gain Output level ALC control range Total harmonic distortion factor Output noise voltage Input impedance Output impedance Symbol GV VO ALC THD VNO ZIN ZOUT Conditions VIN = -40 dBm VIN = -10 dBm Output level varying amount at VIN = -25 dBm, VIN = 0 dBm At VIN = -10 dBm Terminated by CCIT filter input 2 k Pin 3 input impedance Pin 5 output impedance Min 22 -9.5 -1.5 15 200 Typ 24 -7.5 1 -70 30 400 Max 26 -5.5 1.5 3 -60 45 600 Unit dB dBm dB % dBm k 2 ICs for Telephone s Application Notes 1. I/O characteristics and distortion 33 F Signal input (Input frequency = 1 kHz) GND 3 10 k Signal output AN6123MS 4 5 AN6123MS 1 2 1 M 3.0 V 2 200 pF The I/O characteristics in the circuit shown on the left can be referred to in the graph below. Also note that if the C in the circuit is lowered, the distortion characteristics will become worse (Graph 2). C 10 F Graph 1. I/O characteristics and distortion (when C = 10 F) 0 -5 -10 10 Output level 8 6 4 Distortion 2 0 10 -15 -20 -25 -30 -35 -40 -45 -50 -70 -60 -50 -40 -30 -20 -10 0 12 Output level (dBm) Input level (dBm) Graph 2. Distortion characteristics when C is variable 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -40 Distortion (%) C = 10 F C = 4.7 F C = 2.2 F C = 1.0 F -35 -30 -25 -20 -15 -10 -5 0 5 10 Input lebve; (dBm) Distortion (%) 3 AN6213MS s Application Notes (continued) 2. Input level adjustment for maximum output Signal input (1 kHz) 3.3 k 33 F R 3 GND 10 k Signal output ICs for Telephone 4 5 AN6123MS 1 2 1M 3.0 V 10 F 2 200 pF 10 F You can adjust R in the left circuit diagram to find the operation point for a maximum output level. For example, since the input level for a maximum output is -30 dBm when R is open and the attenuation in the input stage is 20 log (3k/6.3k) = -6.4 dB when R is 3 k. This means a total gain loss is -6.4 dB as compared with open mode, hence the input level to get the maximum output is -23.6 dBm. Likewise, the attenuation is 12.7 dB for R = 1 k and the desired input level becomes 17.3 dBm. I/O characteristics 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 R = 1 k R = 3 k R = Open Output level (dBm) Input level (dBm) 3. Output level adjustment for a maximum output Signal input (1 kHz) 3.3 k 33 F 3 GND 10 k Signal output 4 5 AN6123MS 1 2 1M 3.0 V R 2 200 pF 10 F 10 F The maximum output level can be adjusted by R in the left circuit diagram. Since the maximum output is -7.5 dBm when R is open, it is 20 log (20k/30k) = -3.5 dBm at R = 20 k. It is an attenuated value of by 3.4 dB against open mode. Therefore, the maximum output becomes -11 dBm. Likewise, for R = 10 k, attenuation is 6 dB and the maximum output becomes -13.5 dBm. I/O characteristics 0 -5 R = Open R = 20 k Output level (dBm) -10 -15 -20 -25 -30 -35 -50 -45 -40 -35 -30 R = 10 k -25 -20 -15 -10 Input level (dBm) 4 ICs for Telephone s Application Notes (continued) 4. Frequency characteristics AN6123MS Signal input 33 F 3 GND 10 k R Signal output 4 5 AN6123MS 1 2 1 M 3.0 V C 10 F 10 F The AN6123MS itself has an almost flat frequency characteristic in the audio frequency band. The high-band frequency is set with R and C shown in the left circuit. The cut-off frequency fC at R = 10 k and C = 2 200 pF, that is the frequency at which the frequency characteristic deteriorates by 3 dB, is fC = 1/2CR = 7.2 kHz. At R = 10 k and C = 1 000 pF, it is 16 kHz. (Refer to the graph.) Frequency characteristics 10 8 6 4 For C = 1 000 pF Gain (dB) 2 0 -2 -4 -6 -8 -10 100 1k 10k 100k Input signal level: -10 dBm For C = 2 200 pF Input frequency (Hz) s Application Circuit Example Signal output 0.9 V[p-p] Noise = -70 dBm Distortion = 1% Signal input (300 Hz 3 kHz) 3.3 k R 33 F GND 10 k 2 200 pF 3 4 G = 30 dB DET gm 10 F 2 1 5 VCC 1 M 2.4 V 6.0 V 10 F 5 |
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