Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 DESCRIPTION PT2353 is a 3-speaker system electronic crossover IC utilizing CMOS Technology specially designed for the new generation of audio equipments. 3-channel electronic volume control, 2-channel 2nd order high pass filter, 2nd order low pass filter and one mono subwoofer audio output are incorporated into a single high performance chips. PT2353 combines the electronic volume controller and crossover circuitry without MCU handling. Pin assignments and application circuit are optimized for easy PCB layout and cost saving advantages. FEATURES • • • • • • • • CMOS technology Low power consumption 2 built-in individual volume control: 0dB to -60dB 2-channel 2nd order high pass filter + 1 mixed mono subwoofer low pass filter Cross-over frequency adjustable by external passive components Control interface of volume control: Up/Down key (MCU is not necessary) Built-in 3D effect and loudness function Supply voltage: 5V to 9V APPLICATION • Audio equipments PT2353 V1.2 -1- March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 BLOCK DIAGRAM L IN Ma i n Vo l u me HP F LOUT HP F ROUT RE F 3D E ffe c t C i rcu it RIN Ma i n Vo l u me RE F RE F VD D + + + LP F RE F Su b w o o fe r Vo l u me + SO U T VS S RE F PO 3D /PK /3D /SDW /SUP /MDW /MUP C o n t ro l U n it VDD PT2353 V1.2 -2- March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 PIN CONFIGURATION PT2353 V1.2 /3D 1 28 3D_LED VSS 2 27 VDD LOUT 3 26 LIN 4 25 ROUT RIN LT 5 24 RT CL1 6 23 CR1 CL2 7 22 CR2 CL3 8 21 CR3 /SUP 9 20 C2 /SDW 10 19 REF /MUP 11 18 C1N /MDW 12 17 C1P OSC 13 16 SOUT /PK 14 15 PO P T 23 5 3 -3- March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 PIN CONFIGURATION Pin Name /3D VSS LOUT LIN LT CL1 CL2 CL3 /SUP /SDW /MUP /MDW OSC /PK PO SOUT C1P C1N REF C2 CR3 CR2 CR1 RT RIN ROUT VDD 3D-LED PT2353 V1.2 I/O I ― O I I I I I I I I I I I O O I I I I I I I I I O ― O Description 3D Effect Enable Pin (Low: active) Ground Pin Left Channel Output Pin Left Channel Input Pin Left Channel Center Tap (Loudness) Pin Left Channel High Pass Filter Capacitor Pin 1 Left Channel High Pass Filter Capacitor Pin 2 Left Channel High Pass Filter Capacitor Pin 3 Subwoofer Channel Volume Up Control Pin (Low: active) Subwoofer Channel Volume Down Control Pin (Low: active) Main Volume Up Control Pin (Low: active) Main Volume Down Control Pin (Low: active) Oscillation Pin (connects to external RC components) PO Control Pin (Low: active) Power Amplifier Control Pin (controlled by PK pin 14) Subwoofer Channel Output Pin Low Pass Filter External Capacitor Pin Low Pass Filter External Capacitor Pin Reference Voltage = ½ VDD Low Pass Filter External Capacitor Pin 2 Right Channel High Pass Filter Capacitor Pin 3 Right Channel High Pass Filter Capacitor Pin 2 Right Channel High Pass Filter Capacitor Pin 1 Right Channel Volume Center Tap (Loudness) Pin Right Channel Input Pin Right Channel Output Pin Positive Power Supply 3D LED Indicator Pin -4- Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 FUNCTION DESCRIPTION VOLUME CONTROL Both main volume control and subwoofer volume control are supported by PT2353. Please refer to the diagram below. Signal Source Main Volume Control Main Volume Output (Only one channel is shown) HPF LPF Subwoofer Volume Control Subwoofer Output The main volume control is used to adjust all audio volume levels. The subwoofer volume control can be adjusted to match the main volume control. The Main Volume Control is determined by the MUP and/ MDW pins. If the /MUP is connected to the Ground, the main volume level output may be increased. If the /MDW is connected to the Ground, the main volume level output can be decreased. The Subwoofer Volume Control is determined by the /SUP and /SDW pins. If the /SUP is connected to Ground, the subwoofer volume level output can be increased. If the /SDW is connected to the Ground, the subwoofer volume level output can be decreased. When each of the /MUP, /MDW, /SUP, /SDW pins are connected to the GND for an indefinite period of time, please refer to the following diagram. /M PU , /M DW, /S UP, /SD W Inp ut Sta tus Vo lum e Con tro l Statu s t T Notes: 1. t=Default Key Time 2. T=Hold Time (10 x 1/fosc) 3. α=Volume UP/DOWN Switch Time (2 x 1/fosc) 4. fosc=Internal Oscillation Frequency PT2353 V1.2 -5- α March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 VOLUME ATTENUATION A PT2353 volume control circuit consists of ladder resistors and analog switches. The Tap for Loudness Function (LT & RT) is connected to the Step 6 (-20dB). Therefore, the Loudness Function Effect will be clearly audible when the volume setting is less than -20dB. Please refer to the attenuation table given below. Step 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PT2353 V1.2 Attenuation 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 Step 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 -6- Attenuation -32 -34 -36 -38 -40 -42 -44 -46 -48 -50 -52 -54 -56 -58 -60 ∞ March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC The equivalent circuit is shown below. PT2353 OUT Step 0 IN Step 1 Step 2 29K Step 9 LT Step 10 Step 11 22K Step 30 Step 31 AGND VOLUME INITIALIZATION After power is turned ON, the volume control value of the main channel is set to the initial setting of -30dB step while the subwoofer channel will be set at 0dB. The PT2353 loudness frequency response curve from Step 0 to Step 31 is given below. Step 0 Step 31 PT2353 V1.2 -7- March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 FILTER The main channel of PT2353 includes the high pass filter which is used to filter out the main speaker’s low frequency characteristics. The filtered signal is then combined with the subwoofer low pass filter characteristics. This High Pass Filter is of Sallen Key Type with a pass band gain equivalent to 0dB. Adjustment of the crossover frequency is made via the two external capacitors. Please refer to the figure below. C C CL1 CL2 CL3 Signal In LOUT/ROUT － + REF Subwoofer channel mixed from the Main Channel also uses the Sallen Key Type Low Pass Filter to filter out the high frequency characteristics. Two external capacitors can be used to adjust the crossover frequency. Please refer to the diagram below. C1 REF SOUT C2 Signal In PT2353 V1.2 -8- March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 The subwoofer in this 3-speaker system has only one channel output; therefore, it is recommended that the LPF must be less than 300Hz. If the frequency is greater than 300 Hz, then the audio output is can be clearly discernible. That is, it is easy to know where the sound is coming from. The following diagram provides the suggested crossover frequencies and respective external capacitors. Notes: ⎯⎯⎯ - - — — Crossover Frequency: 280Hz, C=0.015µF, C1=0.047µF, C2=0.018µF Crossover Frequency: 200Hz, C=0.022µF, C1=0.068µF, C2=0.027µF Crossover Frequency: 120Hz, C=0.033µF, C1=0.1µF, C2=0.047µF C is the High Pass Filter External Capacitor. C1 and C2 are the Low Pass Filter External Capacitors PT2353 V1.2 -9- March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 3D EFFECT FUNCTION The 3D Pin controls the 3D effect function of PT2353. It toggles between turning the 3D effect function ON or OFF. When the 3D effect function is enabled, the 3D LED is displayed. When the PO pin in low state the 3D function and 3D LED is both inhibited. POWER CONTROL PK (Pin 14) is the PO Control Pin and is used to toggle between activating and deactivating the PO pin (Pin 15). The power amplifier status (ON or OFF) may be controlled by connecting the external power amplifier device to the PO Pin. After the power supply is first applied to the VDD pin of PT2353, the output state for the PO and 3D pins is LOW. During this state, all the control function keys are disabled, with the exception of the PK key. When the PK key is pressed once, the PO is set to HIGH and all the control function keys are activated. PT2353 V1.2 - 10 - March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 ABSOLUTE MAXIMUM RATING Parameter Operating voltage Ambient temperature Storage temperature Symbol Vs Topr Tstg Rating 10.2 -40 to +85 -65 to +150 Unit V ℃ ℃ ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25℃, VDD=9V, RL=100KΩ, f=1KHz) Parameter Symbol Condition Min. Power supply VDD 5 3D, PK OFF, VDD=9V Operating current Is 3D, PK OFF, VDD=4.5V ATT=0dB, F=1KHz VIN=1Vrms, 20Hz ~ 20KHz All filters bypass, All outputs Total harmonic distortion THD ATT=-20dB, F=1KHz VIN=1Vrms, 20Hz ~ 20KHz All filters bypass, All outputs ATT=0dB, VIN=0V Output noise NO A-weighting, All filters bypass 0dB=1Vrms, ATT=0dB Signal-to-noise ratio S/N VIN=0V, A-weighting All filters bypass f=1KHz, ATT=0dB Maximum input voltage VIMAX VDD=9V f=1KHz, ATT=0dB Voltage gain Gn -1 All Outputs 0dB=1Vrms, f=1KHz Cross talk CT VIN=1Vrms, RL=100K RG=600Ω, A-weighting f=1KHz, VIN=1Vrms Maximum volume ATTMAX LOUT, ROUT attenuation Main volume =Max, SOUT High level input voltage VIH 6.7 Low level input voltage VIL 0 LED sink current IS 3D LED Pin Drive current IO PO Vout=100mV Output impedance RO 70 f=1KHz Input impedance RI 40 PT2353 V1.2 - 11 - Typ. 23 18 Max. 9.5 - 0.01 - Unit V mA mA % 0.05 - 15 - µV 90 - dB 2.7 - Vrms 0 +1 dB -86 - dB -75 - dB -75 6 5 9 3.2 - dB V V mA mA 100 130 Ω 50 60 KΩ March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 APPLICATION CIRCUIT VDD 9V VDD 9V 3D LED 3D L OUT 100K 1 /3D 2 VSS 3 LOUT 3D_LED 28 VDD 27 ROUT 26 10uF VDD 9V 10uF L IN 100K ** 1K ** BAV99 LIN RIN 25 5 LT RT 24 6 220 u33 CR1 CL1 C 7 REF R OUT 100K 10uF 4 2K2 8n2 100uF CR2 CL2 VDD 9V ** 1K 2K2 ** BAV99 23 220 22 C R IN 10uF 100K u33 C REF C 8 CL3 PT2353 CR3 21 /SUP 9 /SUP C2 20 /SDW 10 /SDW REF 19 REF C2 100uF /MUP 11 /MUP C1N 18 /MDW 12 /MDW C1P 17 C1 SOUT 16 10uF 33K 8n2 13 OSC S OUT 100K 2u2 14 PO /PK 15 Power Key * Notes: Please refer to the PT2353 Crossover Frequency Response Curve for the values of C, C1, and C2. Please refer to Power Control (PO) Section of this document. ** For input port high voltage pulse protection. PT2353 V1.2 - 12 - March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 ORDER INFORMATION Valid Part Number PT2353 PT2353-S PT2353 V1.2 Package Type 28 Pins, DIP, 600mil 28 Pins, SOP, 300mil - 13 - Top Code PT2353 PT2353-S March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 PACKAGE INFORMATION 28 PINS, DIP, 600MIL PT2353 V1.2 - 14 - March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC Symbol A A1 A2 B B1 C D D1 E E1 e eA eB L Min. 0.39 3.18 0.356 0.77 0.204 35.1 0.13 15.24 13.32 PT2353 Max. 6.35 4.95 0.558 1.77 0.381 39.7 15.87 14.73 2.54 BSC. 15.24 BSC. 2.93 17.78 5.08 Notes: 1. Controlling Dimension: Millimeter 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimensions “A”, “A1”< and “L” are measured with the package seated in JEDEC Seating Plane Gauge GS-3. 4. “D” and “E1” are dimensions for plastic packages, do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.10 inch (0.25mm). 5. “E” and “A” are measured with the leads constrained to be perpendicular to plane T. 6. “eB” and “oC” are measured at the lead tips with the leads unconstrained. “oC” must be zero or greater. 7. N is the maximum number of terminal positions. (N=28) 8. Corner leads (I, N, N/2+1) may be configured as shown in Figure 2. 9. Pointed or rounded lead tips are preferred to ease insertion. 10. For automatic insertion, any raised irregularity on the top surface (step, mess, etc.) shall be symmetrical about the lateral and longitudinal package centerlines. 11. Please refer to JEDEC MS-011 Variation AB. JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION. PT2353 V1.2 - 15 - March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 28 PINS, SOP, 300MIL Symbol A A1 B C D E e H h L α PT2353 V1.2 Min. 2.35 0.10 0.33 0.23 17.70 7.40 Nom. Max. 2.65 0.30 0.51 0.32 18.10 7.60 1.27 BSC. 10.00 0.25 0.40 0° 10.65 0.75 1.27 8° - 16 - March, 2006 Tel: 886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw Satellite + Subwoofer 3-Speaker System Electronics Crossover IC PT2353 Notes: 1. Dimensioning and tolerancing per ANSI Y14.5-1982. 2. Dimension “D” does not include mold flash , protrusions or gate burrs. Mold Flash, protrusion or gate burrs shall not exceed 0.15mm (0.006 in) per side. 3. Dimension “E” does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. The chamfer on the body is optional. It is not present, a visual index feature must be located within the crosshatched area. 5. “L” is the length of the terminal for soldering to a substrate. 6. “N” is the number of terminal positions. (N=28) 7. The lead width “B” as measured 0.36 mm (0.014 in) or greater above the seating plane, shall not exceed a maximum value of 0.61 mm (0.24 in). 8. Controlling dimension: Millimeter 9. Refer to JEDEC MS-013 Variation AE JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION. PT2353 V1.2 - 17 - March, 2006