TK15322 Audio Analog Switch FEATURES APPLICATIONS ■ ■ ■ ■ ■ ■ Audio Systems ■ Radio Cassettes Wide Operating Voltage Range (2 to 14 V) Low Distortion (typ. 0.004%) Wide Dynamic Range (typ. 6 VP-P) Low Output Impedance (typ. 20 Ω) Low Switching Noise (typ. 3 mV) DESCRIPTION TK15322 The TK15322M is an Analog Switch IC that was developed for audio frequency. Function is to select one output from two inputs in a device that includes two circuits, and the channel can be changed by high level. The TK15322M has a mono-power supply and the input bias is a built-in type (VCC / 2 V). Because the distortion is very low, the TK15322M fits various signals switching. It is best suited for Hi-Fi devices. Operating voltage is wide, the circuit plan is simple. The TK15322M is available in a small plastic surface mount package (SSOP-12). VCC Bch OUT 1ch-in GND 11 Bch 10 OUT Ach 9 Ach 1KEY 8 2 KEY NC 7 NC 2ch-in BLOCK DIAGRAM VCC Ach + 1 ch ou - 1ch-in 1KEY Bch + - ORDERING INFORMATION Reg. (VCC / 2) Ach + - TK15322M 2 ch ou 2ch-in 2KEY Bch + - GND Tape/Reel Code TAPE/REEL CODE TL: Tape Left June 1999 TOKO, Inc. Page 1 TK15322 ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................... 15 V Power Dissipation (Note 4) ................................ 350 mW Storage Temperature Range ................... -55 to +150 °C Operating Temperature Range ...................-20 to +75 °C CONTROL SECTION Input Voltage ................................... -0.3 V to VCC + 0.3 V ANALOG SWITCH SECTION Signal Input Voltage ........................ -0.3 V to VCC + 0.3 V Signal Output Current ............................................. 3 mA Operating Voltage Range ................................. 2 to 14 V Maximum Input Frequency .................................. 100 kHz TK15321M ELECTRICAL CHARACTERISTICS Test conditions: VCC = 8.0 V, TA = 25 °C, unless otherwise specified. SYMBOL ICC PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 4.2 6.5 mA -0.3 +0.8 V 1.8 VCC + 0.3 V Supply Current KEY CONTROL SECTION VIL Input Voltage Low Level VIH Input Voltage High Level ZIN Input Impedance Note 1 50 kΩ ANALOG SWITCH SECTION THD Total Harmonic Distortion VIN = 1 Vrms, f = 1 kHz NL Residual Noise ISO 0.008 % Note 2 10 µVrms Isolation VIN = 1 Vrms, f = 10 kHz, Note 3 -75 dB SEP Separation VIN = 1 Vrms, f = 10 kHz, Note 3 -80 dB D YN Maximum Input Signal Level f = 1 kHz, THD = 0.1% GVA Voltage Gain f = ~20 kHz Vcent Input-Output Terminal Voltage VCC / 2 output ∆Vcent Output Terminal Voltage Difference Between same channel RIN Input Bias Resistance ZOUT Output Impedance DC Impedance 0.004 2.0 Vrms 0 3.8 dB 4.0 4.2 V 3 13 mV 65 kΩ 20 Ω Note 1: The KEY input equivalent circuit is shown to the right. 1 channel and 2 channel is the separate action by 1Key pin and 2 key pin. When the control pin is open, it is outputted low level. Then the A channel input signal is Input Key outputted. The change is carried out at high level. Note 2: The specification means a value as measurement-input terminal connects to ground through a capacitor. Note 3: ISO is a cross talk between A channel and B channel, SEP is a cross talk between 1 channel and 2 channel. The specification means a value as measurement-input termianl connects to ground through 10 kΩ resistor and capacitor. Note 4: Power dissipation is 350 mW when mounted as recommended. Derate at 3.0 mW/°C for operation above 25°C. Page 2 Logic June 1999 TOKO, Inc. TK15322 TEST CIRCUITS AND METHODS 33 µF + VCC SW6 SW7 10 µF + SW3 + 10 µF SW9 SW4 SW8 SW2 1 kHz 1 Vrms or 2 Vrms 1: 2: 3: 4: ~ SW1 SW5 10 kHz 1 Vrms ~ 10 kΩ L V ~ V _ H THD The above condition represents 1ch. The above conditions distortion rate of 1-Ach and dynamic range measurement. SW5 is for residual noise measurement. SW8 is for cross talk (ISO or SEP) measurement. SUPPLY CURRENT (FIGURE 1) CONTROL LOW/HIGH LEVEL (FIGURE 2) This current is a consumption current with a nonloading condition. 1) Measure the inflow current to Pin 1 from VCC. This current is the supply current. This level is to measure the threshold level. 1) Input, the VCC to Pin 1. (This condition is the same with other measurements, omitted from the next for simplicity) 2) Input to Pin 4 with sine wave (f = 1 kHz, VIN = 1 Vrms). 3) Connect an oscilloscope to Pin 3. 4) Drop the control voltage from VCC gradually, until the sine wave appears at the oscilloscope. This voltage is the threshold level when the wave appears. VCC A Figure 1 June 1999 TOKO, Inc. Page 3 TK15322 TEST CIRCUITS AND METHODS (CONT.) TOTAL HARMONIC DISTORTION (FIGURE 4) VCC + + Cont. ~ Figure 2 Use the lower distortion oscillator for this measurement because distortion of the TK15322 is very low. 1) Pin 5 is in the open condition, or low level. 2) Connect a distortion analyzer to Pin 3. 3) Input the sine wave (1 kHz, 1 Vrms) to Pin 4. 4) Measure the distortion of Pin 3. This value is the distortion of 1-Ach. 5) Next connect Pin 5 to the VCC, or high level. 6) Input the same sine wave to Pin 2. 7) Measure in the same way. This value is the distortion of 1-Bch. VCC CONTROL INPUT IMPEDANCE (FIGURE 3) This is the input resistance of control terminal. 1) Measure the inflow current from VCC to Pin 5. 2) Calculate: IMP = VCC / Inflow Current This resistance is the input impedance. + + Cont. Figure 4 VCC VOLTAGE GAIN (FIGURE 5) + Figure 3 Page 4 This is the output level against input level. 1) Pin 5 is in the open condition, or low level. 2) Connect AC volt meters to Pin 4 and Pin 3. (Using the same type meter is best) 3) Input a sine wave (f = max. 20 kHz, 1 Vrms) to Pin 4. 4) Measure the level of Pin 4 and name this V1. 5) Measure the level of Pin 3 and name this V2. 6) Calculate Gain = 20 Log (( |V2 - V1| )/V1) V1<V2 + Gain, V1>V2 - Gain This value is the voltage gain of 1-Ach. 7) Next, connect Pin 5 to the VCC, or high level. 8) Input the same sine wave to Pin 2. 9) Measure and calculate in the same way. This value is the voltage gain of 1-Bch. June 1999 TOKO, Inc. TK15322 TEST CIRCUITS AND METHODS (CONT.) VCC VCC + + + Cont. Figure 5 + Cont. Figure 6 MAXIMUM INPUT LEVEL (FIGURE 6) RESIDUAL NOISE (FIGURE 7) This measurement measures at output side. 1) Pin 5 is in the open condition, or low level. 2) Connect a distortion analyzer and an AC volt meter to Pin 3. 3) Input a sine wave (1 kHz) to Pin 4 and elevate the voltage gradually until the distortion gets to 0.1%. 4) When the distortion amounts to 0.1%, stop elevating and measure the AC level of Pin 3. This value is the maximum input level of 1-Ach. 5) Next, connect Pin 5 to the VCC, or high level. 6) Input the same sine wave to Pin 2. 7) Measure in the same way. This value is the maximum input level of 1-Bch. This value is not S/N ratio. This is a noise which occurs from the device itself. 1) Pin 5 is in the open condition, or low level. 2) Connect an AC volt meter to Pin 3. 3) Connect a capacitor from Pin 4 to GND. 4) Measure AC voltage of Pin 3. This value is the noise of 1-Ach. If the influence of noise from outside exists, use optional filters. 5) Next, connect Pin 5 to the VCC, or high level. 6) Connect to GND through a capacitor from Pin 2. 7) Measure in the same way. This value is the noise level of 1-Bch. June 1999 TOKO, Inc. Page 5 TK15322 TEST CIRCUITS AND METHODS (CONT.) VCC VCC + + + + + 10 K Cont. Cont. Figure 7 Figure 8 ISOLATION (FIGURE 8) SEPARATION (FIGURE 9) This is the cross talk between Ach and Bch. 1) Pin 5 is in the open condition, or low level. 2) Connect AC volt meters to Pin 2 and Pin 3. 3) Connect a capacitor and a resistance in series to GND from Pin 4. 4) Input a sine wave (10 kHz, 1 Vrms) to Pin 2. 5) Measure the level of Pin 2 and name this V3. 6) Measure the level of Pin 3 and name this V4. 7) Calculate: ISO = 20 Log (V4 / V3) This value is the isolation to Ach from Bch. 8) Next, connect Pin 5 to the VCC, or high level. 9) Change line of Pin 2 and Pin 4. 10) Input the same sine wave to Pin 4. 11) Measure and calculate in the same way. This value is the isolation to Bch from Ach. This is the cross talk between 1ch and 2ch. 1) Control level is free for Pin 5 and Pin 8. 2) Connect AC volt meters to Pin 4 (or Pin 2) and Pin 10. 3) Connect Pin 9 and Pin 11 to GND through capacitors and a resistance from Pin 9 and Pin 11 to GND. 4) Input a sine wave (10 kHz, 1 Vrms) to Pin 2 and Pin 4. 5) Measure the level of Pin 4 and name this V5. 6) Measure the level of Pin 10 and name this V6. 7) Calculate: SEP = 20 Log (V6 / V5) This value is the separation to 2ch from 1ch. Page 6 June 1999 TOKO, Inc. TK15322 TEST CIRCUITS AND METHODS (CONT.) OUTPUT TERMINAL DIFFERENCE VCC This is the DC output voltage difference between Ach and Bch. This is calculated by using values measured at the I/O Terminal Voltage. ∆ Vcent = | (1 - Ach value) - (1 - Bch value) | This value is the voltage difference of 1ch. + + + + + 10 K Cont. Figure 9 I/O TERMINAL VOLTAGE (FIGURE 10) This is the DC voltage of input and output. Because the input and the output are nearly equal, only the output is measured. 1) Pin 5 is in the open condition, or low level. 2) Connect a DC volt meter to Pin 3 and measure. This value is the terminal voltage of 1-Ach. 3) Next, connect Pin 5 to the VCC, or high level. 4) Measure in the same way. This value is the terminal voltage of 1-Bch. VCC + Cont. Figure 10 June 1999 TOKO, Inc. Page 7 TK15322 TYPICAL PERFORMANCE CHARACTERISTICS VCC = 8 V, TA = 25 °C, unless otherwise specified. TOTAL HARMONIC DISTORTION vs. FREQUENCY SUPPLY CURRENT VS. SUPPLY VOLTAGE TOTAL HARMONIC DISTORTION vs. LOAD RESISTANCE 0.1 6 0.1 THD (%) ICC (mA) 4 3 THD (%) 5 0.01 0.01 2 1 0 0 2 4 6 8 10 12 14 16 0.001 0.1 1 10 100 0.001 0.1 10 VCC (V) RL (kΩ) DYNAMIC RANGE vs. SUPPLY VOLTAGE DYNAMIC RANGE vs. LOAD RESISTANCE ISOLATION vs. FREQUENCY 100 -60 5 -70 LEVEL (Vrms) 3 2 LEVEL (dB) 2 4 LEVEL (Vrms) 1 f (kHz) 1 -80 -90 -100 1 0 0.1 0 0 2 4 6 8 10 12 14 16 1 10 100 -110 0.1 1 10 100 VCC (V) RL (kΩ) f (kHz) SEPARATION vs. FREQUENCY CONTROL THRESHOLD VS. TEMPERATURE VOLTAGE GAIN VS. TEMPERATURE -60 -80 -90 GVA (dB) LEVEL (V) LEVEL (dB) +.1 1.5 -70 1 0 -.1 0.5 -100 -110 0.1 0 1 10 f (kHz) Page 8 100 -20 0 20 40 TA (°C) 60 80 -20 0 20 40 60 80 TA (°C) June 1999 TOKO, Inc. TK15322 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) VCC = 8 V, TA = 25 °C, unless otherwise specified. RESIDUAL NOISE VS. TEMPERATURE OUTPUT DIFFERENCE VS. TEMPERATURE 3 LEVEL (mV) LEVEL (µVrms) 6 4 2 2 1 0 0 -20 0 20 40 60 80 -20 0 20 TA (°C) 40 60 80 TA (°C) TERMINAL VOLTAGE AND CIRCUIT Condition: VCC = 8 V. PIN NO. ASSIGNMENT DC VOLTAGE 1 VCC 8V 2 4 9 11 IN A, IN B 4V CIRCUIT/FUNCTION Supply Voltage Pin VCC / 2 65 K Signal Input Pin 3 10 OUT 4V 100 Signal Output Pin 5 8 KEY 50 K 0V Control Pin 12 GND 0V 6 7 NC Floating June 1999 TOKO, Inc. Ground Pin No Contact Pin Page 9 TK15322 APPLICATION INFORMATION 1Ain KEY INPUT CIRCUIT 1ch and 2ch is separate action by each control keys. Figure 11 is an equivalence circuit of key input. When terminal of key is the open, is outputting high level, and then Ach input signal is outputted. The channel at TK15322M can be changed by high level. 33 µF + 10 µF + + 10 µF 10 µF 10 µF 11 + + 10 9 to Logic + 8 + RL Key in 2Ain VCC RL 7 10 µF 10 µF 1Key 1Bin Figure 11 2Key 2 Bin Figure 13 SWITCHING TIME This time is the signal change response time compared to the control key input signal. Figure 12 illustrates the timimg chart. T = 2 µs typically. Bch (Ach) Key in SW out 50% t Ach (Bch) Figure 12 APPLICATION Figure 13 illustrates an example of a typical application. The standard application is to use capacitor coupling at the inputs and output of the TK15322M. For characteristics of distortion and dynamic range versus RL, refer to the graphs in the Typical Performance Characteristics. The TK15322M can also be used with direct coupling, but the characteristics will get worse (distortion, etc.). If direct coupling is desired, then it is recommended to use external circuitry that is biased compatible with the TK15322M. Input of the TK15322M is the open base type. CROSS TALK (ISOLATION AND SEPARATION) Figure 14 is an example of a layout pattern. In the application of the TK15322M, the following must be considered. Because of the high impedance at the inputs, the capacitors can act as antennas to each other. If the parts are bigger, and the space between the capacitors is too narrow, then cross talk will increase. Therefore, when designing the printed circuit pattern, separate the input capacitors as far as possible and use as small a part as possible (e.g., surface mount types, etc.). 1BIN VCC GND 1OUT 1AIN 2BIN 2OUT 1KEY 2KEY 2AIN Figure 14 Page 10 June 1999 TOKO, Inc. TK15322 APPLICATION INFORMATION (CONT.) OUTPUT TERMINAL VOLTAGE DIFFERENCE This parameter is the output voltage difference between Ach and Bch, and appears when the channel changes from Ach to Bch, or changes to the reverse. Generally, this is called Switching Noise or Pop Noise. If this value is big and if this noise is amplified by the final amplifier and is outputted by the speakers, then it appears as a Shock Sound. Output terminal voltage difference of the TK15322M is a value that adds the internal bias difference and the off-set voltage difference. The value of the TK15322M is very small; its maximum value is 13 mV. Toko can offer the “Muting IC” if users wish to mute Switching Noise. DIRECT TOUCH The signal input terminals: Internal circuits are operated by constant current circuit, even if VCC or GND is contacted, damage does not occur. The signal output terminal: Outflow or inflow current is decided by ability of final transistor, but the protection circuit is not attached. If GND or VCC are contacted damage may occur. Pay attention to long time contact. Do not supply over the maximum rating. Referenced to GND, do not provide to all terminals over VCC +0.3 V or -0.3 V. DC SIGNAL INPUT The output of the TK15322M has a saturation voltage (both VCC and GND sides about 1.0 V); accordingly the use of a DC signal is not recommend (e.g., the pulse signal etc.) NC TERMINAL NC terminals are not wired inside IC by bonding wire. NC terminals are not tested so do not connect at outside. June 1999 TOKO, Inc. Page 11 TK15322 PACKAGE OUTLINE Marking Information SSOP-12 TK15322M 322 1.2 0.4 Marking 12 e1 5.4 7 4.4 AAA e 0.8 YYY Recommended Mount Pad 1 6 Lot. No. 0 ~ 10 1.7 max +0.15 -0.15 0.5 +0.15 0.3 -0.05 0.15 0 ~ 0.2 1.4 5.0 e 0.8 0.1 6.0 0.10 + 0.3 M Dimensions are shown in millimeters Tolerance: x.x = ± 0.2 mm (unless otherwise specified) Toko America, Inc. Headquarters 1250 Feehanville Drive, Mount Prospect, Illinois 60056 Tel: (847) 297-0070 Fax: (847) 699-7864 TOKO AMERICA REGIONAL OFFICES Midwest Regional Office Toko America, Inc. 1250 Feehanville Drive Mount Prospect, IL 60056 Tel: (847) 297-0070 Fax: (847) 699-7864 Western Regional Office Toko America, Inc. 2480 North First Street , Suite 260 San Jose, CA 95131 Tel: (408) 432-8281 Fax: (408) 943-9790 Eastern Regional Office Toko America, Inc. 107 Mill Plain Road Danbury, CT 06811 Tel: (203) 748-6871 Fax: (203) 797-1223 Semiconductor Technical Support Toko Design Center 4755 Forge Road Colorado Springs, CO 80907 Tel: (719) 528-2200 Fax: (719) 528-2375 Visit our Internet site at http://www.tokoam.com The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc. Page 12 © 1999 Toko, Inc. All Rights Reserved June 1999 TOKO, Inc. IC-119-TK119xx 0798O0.0K Printed in the USA