AN6123

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 µA • 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 = 25°C. 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 = 25°C 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 µA 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 kΩ 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 kΩ Ω 2 ICs for Telephone s Application Notes 1. I/O characteristics and distortion 33 µF Signal input (Input frequency = 1 kHz) GND 3 10 kΩ Signal output AN6123MS 4 5 AN6123MS 1 2 1 MΩ 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 µF Graph 1. I/O characteristics and distortion (when C = 10 µF) 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 µF C = 4.7 µF C = 2.2 µF C = 1.0 µF −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 kΩ 33 µF R 3 GND 10 kΩ Signal output ICs for Telephone 4 5 AN6123MS 1 2 1M Ω 3.0 V 10 µF 2 200 pF 10 µF 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 kΩ. 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 kΩ 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 kΩ R = 3 kΩ R = Open Output level (dBm) Input level (dBm) 3. Output level adjustment for a maximum output Signal input (1 kHz) 3.3 kΩ 33 µF 3 GND 10 kΩ Signal output 4 5 AN6123MS 1 2 1M Ω 3.0 V R 2 200 pF 10 µF 10 µF 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 kΩ. It is an attenuated value of by 3.4 dB against open mode. Therefore, the maximum output becomes −11 dBm. Likewise, for R = 10 kΩ, attenuation is 6 dB and the maximum output becomes −13.5 dBm. I/O characteristics 0 −5 R = Open R = 20 kΩ Output level (dBm) −10 −15 −20 −25 −30 −35 −50 −45 −40 −35 −30 R = 10 kΩ −25 −20 −15 −10 Input level (dBm) 4 ICs for Telephone s Application Notes (continued) 4. Frequency characteristics AN6123MS Signal input 33 µF 3 GND 10 kΩ R Signal output 4 5 AN6123MS 1 2 1 MΩ 3.0 V C 10 µF 10 µF 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 kΩ and C = 2 200 pF, that is the frequency at which the frequency characteristic deteriorates by 3 dB, is fC = 1/2πCR = 7.2 kHz. At R = 10 kΩ 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 kΩ R 33 µF GND 10 kΩ 2 200 pF 3 4 G = 30 dB DET gm 10 µF 2 VCC 1 MΩ 2.4 V ∼ 6.0 V 1 5 10 µF 5