ICs for Telephone AN6123MS Speech network IC with ALC ■ Overview 0.65 ± 0.15 Unit: mm 1.9 ± 0.1 0.95 0.95 4 0.3 3 + 0.1 − 0.05 1.45 ± 0.1 0.8 0.2 2.9 +− 0.05 0 to 0.1 ■ Applications 0.10 0.16 +− 0.06 0.4 ± 0.2 5 0.65 ± 0.15 • 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. 0.2 2.8 +− 0.3 ■ Features 0.1 to 0.3 2 0.25 1.5 +− 0.05 1 0.2 1.1 +− 0.1 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. • Cordless telephone, PDC, PHS telephone MINI-5D 5 GND 4 gm VCC 1 Input 3 DET DET 2 Output ■ Block Diagram 1 AN6213MS ICs for Telephone ■ Pin Descriptions Pin No. Description 1 VCC Supply voltage pin 2 DET Detection pin 3 Input Signal input pin 4 GND Grounding pin 5 Output Signal output pin ■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage VCC 6.5 V Supply current ICC 3.0 mA PD 19.5 mW Topr −20 to +75 °C Tstg −55 to +125 °C Power dissipation Operating ambient temperature Storage temperature * * Note) *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 2.4 to 6.0 V ■ Electrical Characteristics at VCC = 3.0 V, f = 1 kHz, Ta = 25°C Parameter Operating current Symbol ICC Conditions Without signal input Min Typ Max Unit 450 900 µA • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Conditions Min Typ Max Unit Voltage gain GV VIN = −40 dBm 22 24 26 dB Output level VO VIN = −10 dBm −9.5 −7.5 −5.5 dBm −1.5 1.5 dB ALC control range ∆ALC Output level varying amount at VIN = −25 dBm, VIN = 0 dBm Total harmonic distortion factor THD At VIN = −10 dBm 1 3 % Output noise voltage VNO Terminated by CCIT filter input 2 kΩ −70 −60 dBm Input impedance ZIN Pin 3 input impedance 15 30 45 kΩ ZOUT Pin 5 output impedance 200 400 600 Ω Output impedance 2 Symbol ICs for Telephone AN6123MS ■ Application Notes 1. I/O characteristics and distortion 33 µF Signal input (Input frequency = 1 kHz) 10 kΩ GND 3 4 5 AN6123MS 1 2 2 200 pF 1 MΩ C Signal output 3.0 V 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). 10 µF Graph 1. I/O characteristics and distortion (when C = 10 µF) 12 0 −5 10 Output level −15 8 −20 −25 6 −30 4 −35 −40 Distortion Distortion (%) Output level (dBm) −10 2 −45 −50 −70 −60 −50 −40 −30 −20 −10 0 10 0 Input level (dBm) Distortion (%) Graph 2. Distortion characteristics when C is variable 13 12 11 10 9 8 7 6 5 4 3 2 1 0 −40 C = 10 µF C = 1.0 µF C = 4.7 µF C = 2.2 µF −35 −30 −25 −20 −15 −10 −5 0 5 10 Input lebve; (dBm) 3 AN6213MS ICs for Telephone ■ Application Notes (continued) 2. Input level adjustment for maximum output Signal input (1 kHz) 33 µF 3.3 kΩ R 3 Signal output 10 kΩ GND 4 5 AN6123MS 1 2 2 200 pF 1M Ω 10 µF 3.0 V 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 Output level (dBm) −10 −15 R = Open −20 −25 −30 −35 R = 3 kΩ −40 R = 1 kΩ −45 −50 −55 −60 −70 −65 −60 −55 −50 −45 −40 −35 −30 −25 −20 −15 −10 −5 0 Input level (dBm) 3. Output level adjustment for a maximum output Signal input (1 kHz) 33 µF 3.3 kΩ 10 kΩ GND 3 4 5 AN6123MS 1 2 R 1M Ω 10 µF Signal output 3.0 V 2 200 pF 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 R = Open Output level (dBm) −5 R = 20 kΩ −10 −15 R = 10 kΩ −20 −25 −30 −35 −50 −45 −40 −35 −30 −25 Input level (dBm) 4 −20 −15 −10 ICs for Telephone AN6123MS ■ Application Notes (continued) 4. Frequency characteristics Signal input 33 µF 10 kΩ GND 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.) Signal output R 3 4 5 AN6123MS 1 2 10 µF C 10 µF 1 MΩ 3.0 V Frequency characteristics 10 8 For C = 1 000 pF 6 Gain (dB) 4 2 0 Input signal level: −10 dBm −2 For C = 2 200 pF −4 −6 −8 −10 100 1k 10k 100k Input frequency (Hz) ■ Application Circuit Example Signal input (300 Hz ∼ 3 kHz) GND 10 kΩ R G = 30 dB 10 µF gm 1 2 DET 5 4 2 200 pF 3 3.3 kΩ 33 µF Signal output 0.9 V[p-p] Noise = −70 dBm Distortion = 1% VCC 1 MΩ 2.4 V ∼ 6.0 V 10 µF 5