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| ICs for Telephone AN6215S AGC IC for telephone speech network s Overview The AN6215S is an AGC IC for telephone speech network, and it incorporates an microphone input detection circuit and a receiver gain control circuit. It is especially best suited for cordless telephone thanks to a good speech tone quality obtained by reducing howling and echo sound. 0.4 0.25 Unit: mm 1.27 0.6 0.3 1 2 3 4 8 7 6 5 5.0 0.3 0.15 0.65 s Features * Operation with wide power supply voltage range from 2.1 V to 6.0 V * Enlargement of dynamic range by incorporating a variable VREF circuit that varies according to the supply voltage * Possible to adjust the received voice attenuation amount with an external resistor * Possible to adjust the AGC operating point with an external resistor * Possible to design with fewer external components 0.1 0.1 0.3 4.2 0.3 6.5 0.3 SOP008-P-0225A s Block Diagram VCC 7 6 8 Det. VREF CC Buff 1 2 3 GND 4 5 1.5 0.2 1 AN6215S s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 Symbol GND GAIN RX IN RX OUT TX DET TX IN VC VCC Description Ground pin Variable gain adjustment pin Receiver signal input pin Receiver signal output pin Transmitter signal detection pin Transmitter signal input pin VREF control pin Supply voltage 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 2.1 to 6.0 Unit V s Electrical Characteristics at Ta = 25C Parameter Operating current *1 Receiver amp. voltage gain *1 Receiver amp. output D range *1 Receiver amp. variable gain width *1, *2 High-level VREF control sink current High-level VREF control voltage Low-level VREF control voltage Symbol ICC GRX VORX Gain ICH VCH VCL Conditions Operating time at no signal input RX in = -20 dBm Output voltage at THD = 5% Receiver amp. gain variation between TX in = -50 dBm and TX in = -30 dBm VCH = 3 V Pin 7 voltage range in a base-set mode Pin 7 voltage range in a hand-set mode Min 1.5 0 -10 1.5 0 Typ 1.4 3.5 2 -8 25 Max 2.0 5.5 -6 50 VCC 0.5 Unit mA dB dBm dB A V V Note) 1. VCC = 5.0 V, f = 1 kHz unless otherwise specified. 2. *1: Pin 7 DC voltage sets to VCH = 5.0 V *2: ERO-25CKF6802 produced by Matsushita Electronic Components Co. is used for RX in = -30 dBm. (Refer to " Application circuit example".) 2 ICs for Telephone s Electrical Characteristics at Ta = 25C (continued) * Design reference data Note) 1. The characteristics listed below are theoretical values based on the IC design and are not guaranteed. 2. VCC = 5.0 V, f = 1 kHz unless otherwise specified. AN6215S Parameter Detection circuit input impedance Detection circuit gain Receiver amp. input impedance Receiver amp. output wave distortion factor Receiver amp. output noise voltage Receiver amp. output impedance Sidetone control operation voltage Sidetone control Gain variation rate Base set mode VREF voltage Hand set mode VREF voltage Symbol ZIDET GDET ZIRX THD NORX ZORX VDET R VRB VRH Conditions Pin 5 input impedance R in = 10 k Pin 3 input impedance VORX = -10 dBm (80 kHz LPF) Wide band Pin 4 output impedance DC voltage of pin 5 when sidetone control operates RX out/TX in at TX in = -39 dBm Pin 4 DC voltage at pin 7 = high Pin 4 DC voltage at pin 7 = low Min Typ 50 27 25 0.3 -65 1 0.3 - 0.6 2 1.15 Max Unit dB k % dBm k V dB/dB V V s Terminal Equivalent Circuits Pin No. 1 2 Equivalent circuit Description GND: Ground pin GAIN: Gain adjustment pin Gain width of receiver amp. can be changed by changing the external resistance. R1 to large Gain width becomes Receiver amp. large. R1 to small Gain width becomes small. Typical wave 0V DC 1.15 V 2 1.15 V R1 I2 17 A 68 k 3 VREF 25 k 3 C1 RX IN: Receiver signal input pin Input receiver sound signal from line. Input impedance is 25 k. 4 Receiver amp. 4 C2 Receiver signal To receiver amp. RX OUT: Receiver signal output pin Connect receiver amp. etc. Output impedance is approximately 50 . 3 AN6215S s Terminal Equivalent Circuits (continued) Pin No. 5 Equivalent circuit Description ICs for Telephone Typical wave TX DET: Transmitter signal detection pin DC Full wave detection Connect a smoothing capacitor and a resister to adjust attack-recovery time of transmitter signal detection. Detection amp. gain is determined by the following equation: 100 (k) x 3 G= R4 (k) C3 large Attack time becomes long. R3 small Recovery time becomes short. TX IN: Transmitter signal input pin Input transmitter sound signal With capacitor DC Input 5 100 k R3 100 k To receiver amp. C3 10 F Without capacitor 6 C4 6 R4 Transmitter signal 7 VH/VL 7 100 k 10 k 180 k Detection 5 VC: Reference voltage control pin Reference voltage VREF becomes 2 V when voltage is high, and becomes 1.15 V when voltage is low. Normally, reference voltage is set to VREF = 2 V when it is used for a baseset, and to VREF = 1.15 V when it is used for a hand-set. DC 8 VCC: Supply voltage pin Connect supply voltage. DC 4 ICs for Telephone s Application Circuit Example * System configuration * Detects input of microphone and gives attenuation to a receiver system * Operating point and variable width of attenuator can be set with external resistor respectively. AN6215S T R Circuit I/F Speech amp. Microphone amp. C4 Microphone VCSW VCC 8 7 6 R1 R3 C3 Det. VREF CC 1 2 3 Buff 5 VCSW: VREF control switch SW on: VREF = 2.0 V SW off: VREF = 1.15 V R1: Detection circuit gain adjustment resistor R2: Receiver Gain width adjustment resistor R3, C3: Resistor and capacitor to determine attack-recovery time of transmitter GND R2 C1 C2 Receiver amp. Receiver amp. BN * Characteristics RX out Gain = - 8 dB (R2 = 68 k) 4 RX out Inclination: R = - 0.6 dB/dB TX in -39 dBm (R1 = 10 k) TX in Figure 1. Variable width of attenuation Figure 2. Operating point of attenuation VREF (V) 2.0 VRB (Base-set mode) 1.15 0.3 VRH (Hand-set mode) VDET Reference voltage VCC Figure 3. Operation of variable VREF circuit 5 |
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