PT2318_10 PTC | Alldatasheet
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Technical content
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 1 - March, 2006 Sound Fader Controller IC PT2318
DESCRIPTION
PT2318 is a sound fader controller IC utilizing CMOS Technology specially designed for car radio hi-fi audio applications. Four selectable stereo inputs, 1 mono input, bass, treble, volume, balance and fader controls, mute function and a special loudness feature which is automatically controlled in combination with the volume level setting are all built into a single I 2C bus controlled stereo preamplifier chip having the highest performanc e and reliability. Pin assignments and application circuits are optimized for easy PCB layout and cost saving advantages.
FEATURES
- CMOS technology
- I 2C bus control interface
- 4 selectable stereo inputs
- 1 mono input
- Volume, Balance and Fader controls
- Bass & Treble controls
- Noise reduction circuit interface provided
- External equalizer interface provided
- Mute control at audio signal zero crossing
- Internal power-on reset function
- Mute function controlled via the I 2C bus or pin
- Special automatic loudness feature in combination with the volume setting
APPLICATIONS
- Car audio
- Hi-Fi audio applications
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 2 - March, 2006 Sound Fader Controller IC PT2318 BLOCK DIAGRAM Logic Bass Control Treble Control Left Channel Volume 1 Loudness Right Channel Volume 1 Loudness Right Channel Ri ght Channel VOL1_L SEL_L VOL1_R SEL_R LOUD_LLOUD_R BAS1_LBAS1_R BAS2_LBAS2_R TRE_LTRE_R MUTE SL_OUT FL_OUT SCL SDA FR_OUT SR_OUT Input Source Selector IN_L1 VREF IN_L2 VCC IN_L3 GN D CAP IN_R4 IN_R3 IN_R2 IN_R1 MONO IN_L4 Volume 2 Balance Fader Rear Volume 2 Balance Fader Rear Volume 2 Balance Fader Front Volume 2 Balance Fader Front IC B u s Mute Function Ze ro Cross Detector Treble Control Left Channel Left Channel Bass Control
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 3 - March, 2006 Sound Fader Controller IC PT2318 PIN CONFIGURATION IN_L1 PT2318 SDA GND SL_OUT FL_OUT TRE_L BAS2_L BAS1_L VOL1_L LOUD_L SEL_I IN_L4 MUTE IN_L3 MONO IN_L2 IN_R1 SCL VCC SR_OUT FR_OUT TRE_R BAS2_R BAS1_R VOL1_R LOUD_R SEL_R IN_R4 VREF IN_R3 CAP IN_R2
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 4 - March, 2006 Sound Fader Controller IC PT2318 PIN DESCRIPTION Pin Name I/O Description Pin No. SDA I Serial Data Input Pin 1 GND - Ground 2 SL_OUT O Left Rear Channel Output Pin 3 FL_OUT O Left Front Channel Output Pin 4 TRE_L I/O Left Channel Treble Control Pin or may be used as External Equalizer Input Pin 5 BAS2_L I/O Left Channel Bass Control Pin or may be used as External Equalizer Output Pin 6 BAS1_L I Left Channel Bass Control Pin 7 VOL1_L I Left Control Section Volume Input Pin 8 LOUD_L I Left Control Section Loudness Input Pin 9 SEL_L O Left Channel Output Source Selector 10 IN_L4 I Left Channel Source 4 Input Pin 11 MUTE I Mute Function Control Pin 12 IN_L3 I Left Channel Source 3 Input Pin 13 MONO I Input “MONO” Source 14 IN_L2 I Left Channel Source 2 Input Pin 15 IN_L1 I Left Channel Source 1 Input Pin 16 IN_R1 I Right Channel Source 1 Input Pin 17 IN_R2 I Right Channel Source 2 Input Pin 18 CAP - Supply Electronic Filtering 19 IN_R3 I Right Channel Source 3 Input Pin 20 VREF - Reference Voltage (0.5Vcc) 21 IN_R4 I Right Channel Source 4 Input Pin 22 SEL_R O Right Channel Output Source Selector 23 LOUD_R I Right Control Section Loudness Input Pin 24 VOL1_R I Right Control Section Volume 1 Input Pin 25 BAS1_R I Right Channel Bass Control Pin 26 BAS2_R I/O Right Channel Bass Control Pin Or may be used as External Equalizer Output Pin 27 TRE_R I/O Right Channel Treble Control Pin Or may be used as External Equalizer Input Pin 28 FR_OUT O Right Front Output Pin 29 SR_OUT O Right Rear Output Pin 30 VCC - Supply Voltage 31 SCL I Serial Clock Input Pin 32
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 5 - March, 2006 Sound Fader Controller IC PT2318 FUNCTION DESCRIPTION BUS INTERFACE Data are transmitted to and from the microprocessor to the PT2318 via the SDA and SCL. The SDA and SCL make up the BUS Interface. It should be noted that the pull-up resistors must be connected to the positive supply voltage. DATA VALIDITY A data on the SDA Line is considered valid and stable only when the SCL Signal is in HIGH State. The HIGH and LOW States of the SDA Line can only change when the SCL signal is LOW. Please refer to the figure below. SDA SCL Data Line St able, DataValid Data Change Allowed START AND STOP CONDITIONS A Start Condition is activated when 1. the SCL is set to HIGH and 2. SDA shifts from HIGH to LOW State. The Stop Condition is activated when 1. SCL is set to HIGH and 2. SDA shifts from LOW to HIGH State. Please refer to the timing diagram below. SDA SCL Start Stop
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 6 - March, 2006 Sound Fader Controller IC PT2318 BYTE FORMAT Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an Acknowledge Bit. The MSB is transmitted first. ACKNOWLEDGE During the Acknowledge Clock Pulse, the master (µP) puts a resistive HIGH level on the SDA Line. The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during the Acknowledge Clock Pulse so that the SDA Line is in a Stable Low State during this Clock Pulse. Please refer to the diagram below. DATA CLK Start MSB Acknowledgment from Receiver 12 3 789 4 The audio processor that has been addressed has to generate an Acknowledge after receiving each byte, otherwise, the SDA Line will remain at the High Level during the ninth (9th) Clock Pulse. In this case, the master transmitter can generate the STOP Information in order to abort the transfer. TRANSMISSION WITHOUT ACKNOWLEDGE If you want to avoid the acknowledge detection of the audio processor, a simpler µP transmission may be used. Wait one clock and do not check the slave acknowledge of this same clock then send the new data. If you use this approach, there are greater chances of faulty operation as well as decrease in noise immunity.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 7 - March, 2006 Sound Fader Controller IC PT2318 INTERFACE PROTOCOL The interface protocol consists of the following: 1. START Condition 2. Chip Address Byte=80H 3. ACK=Acknowledge Bit 4. Data Byte 5. STOP Condition Please refer to the diagram below: MSB First Byte LSB START 1 0 0 0 1 0 0 0 Subaddress ACK Data Byte ACK STOP Chip Address Notes: 1. ACK=ACKNOWLEDGE 2. Max. Clock Speed=100K Bits/S The SUBADDRESS is the Second Byte transmitted following the CHIP ADDRESS Byte. Please refer to the table below. Note: These are Significant SUBADDRESS bits. The last bits of SUBADDRESS are named “specific bit”. When more than one data bit send to PT2318, the SUBADDRESS will increase automatically depend on specific bit. It is unnecessary to send to SUBADDRESS, data bit will fill in SUBADDRESS bit. Please refer to following table. START Chip Address ACK Sub Address ACK Data Byte ACK Data Byte ACK Data Byte ACK Data Byte ACK STOP Start 80H 00H Corresp onding Sub Address 00H Corresp onding Sub Address 01H Corresp onding Sub Address 02H Correspo nding Sub Address 03H End MSB LSB Function 7 6 5 4 3 2* 1* 0* 0 0 0 0 0 0 0 0 Volume/Loudness 0 0 0 0 0 0 0 1 Fader: Front, Right 0 0 0 0 0 0 1 0 Fader: Front, Left 0 0 0 0 0 0 1 1 Fader: Rear, Right 0 0 0 0 0 1 0 0 Fader: Rear, Left 0 0 0 0 0 1 0 1 Bass 0 0 0 0 0 1 1 0 Treble 0 0 0 0 0 1 1 1 Selector Switch
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 8 - March, 2006 Sound Fader Controller IC PT2318 The Third Byte following the CIP ADDRESS & SUBADDRESS is defined in the table below. MSB LSB Function 7 6 5 4 3 2 1 0 ZCM LOFF V5 V4 V3 V2 V1 V0 Volume/Loudness X X FFR5 FFR4 FFR3 FFR2 FFR1 FFR0 Fader: Front, Right X X FFL5 FFL4 FFL3 FFL2 FFL1 FFL0 Fader: Front, Left X X FSR5 FSR4 FSR3 FSR2 FSR1 FSR0 Fader: Rear, Right X X FSL5 FSL4 FSL3 FSL2 FSL1 FSL0 Fader: Rear, Left X X X BAS4 BAS3 BAS2 BAS1 BAS0 Bass X X X TRE4 TRE3 TRE2 TRE1 TRE0 Treble GMU X X X X SC2 SC1 SC0 Selector Switch X=Irrelevant (It should be noted that during testing, this bit is given the value of “1”) I2C BUS START-UP TIMING After Power is turned ON, PT2318 needs to wait for a short time in order to insure stability. This waiting period is relative to the value of Cref. When Cref=10 µF, the waiting time period for PT2318 to send I2C Bus Signal is at least 300ms. If the waiting time period is less than 300ms, I2C Control may fail. Please refer to the figure below. POWER ON VDD SDA/SCL V 90% VDD at least 300ms
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 9 - March, 2006 Sound Fader Controller IC PT2318 SOURCE SELECTOR PT2318 provides 4 selectable stereo inputs and one mono input. The source selector is used to select any one of the mentioned source input options. Please refer to the table below. Source Selector Bits Input Source SC2 SC1 SC0 Stereo Inputs: IN_L1 & IN_R1 1 1 1 Stereo Inputs: IN_L2 & IN_R2 1 1 0 Stereo Inputs: IN_L3 & IN_R3 1 0 1 Stereo Inputs: IN_L4 & IN_R4 1 0 0 Mono Input: MONO 0 X X Notes: 1. SC0 to SC2=Source Selector Control Bits 2. X=Irrelevant
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 10 - March, 2006 Sound Fader Controller IC PT2318 VOLUME CONTROL The Volume Control Function consists of two blocks; namely, Volume 1 Control Block and Volume 2 Control Block. VOLUME 1 CONTROL BLOCK The Volume 1 Control Block has an attenuation range of +20dB to -31dB at 1dB/step. The left and right channels have the same gain/attenuation setting. This block operates in conjunction with the Loudness Control. When the Volume 1 Control maximum gain (=20dB) is selected, the filter characteristic is linear. The filter characteristic increases automatically over a range of 32dB down to a setting of -12dB. This means that the Volume 1 Control Block maximum filter characteristics is obtained at a -12dB setting. If the volume is further reduced, the filter characteristics are not in any way affected. The maximum selected filter characteristics is determined by the external components. Please refer to the diagram below. Volume control and Loudness (Low Roll-Off Frequency included) VOLUME 2 CONTROL BLOCK The Volume 2 Control Block operates in combination with the Balance and Fader Functions. Each output has one independent attenuator which has a control range of 0dB to -55dB at 1dB/step with an additional mute step.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 11 - March, 2006 Sound Fader Controller IC PT2318 BASS FUNCTION The bass function has a control range of -15dB to +15dB at 40Hz. The basic step width of the bass control is 3dB. The intermediate steps are obtained by switching 1.5dB boost and 1.5 dB attenuation steps. The bass control function can be disabled via the I2C Bus. If the bass control function is disabled, the internal signal flow is discontinued, and the pins -- BAS2_L and BAS2-R are used as inputs for connecting an external equalizer. The Bass Function Frequency Response curve is shown below: TREBLE FUNCTION The Treble Function has a control range of -12dB to +12dB at 1.5dB / step at 15KHz. The basic step width of the treble control is 3dB and the intermediate steps are obtained by switching 1.5dB boost and 1.5 dB attenuation steps. The treble control function can be disabled via the I2C Bus. If the treble control function is disabled, the internal signal flow is discontinued, and the treble pins -- TRE_L and TRE_R -- are used as inputs for connecting an external equalizer. The Treble Function Frequency Response Curve is given below.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 12 - March, 2006 Sound Fader Controller IC PT2318 VOLUME SETTING The volume setting table is given below. The loudness characteristic increases in a linear manner for every step in the volume whose range is from +20dB to -11dB. GV (dB) V5 V4 V3 V2 V1 V0 20 1 1 1 1 1 1 19 1 1 1 1 1 0 18 1 1 1 1 0 1 17 1 1 1 1 0 0 16 1 1 1 0 1 1 15 1 1 1 0 1 0 14 1 1 1 0 0 1 13 1 1 1 0 0 0 12 1 1 0 1 1 1 11 1 1 0 1 1 0 10 1 1 0 1 0 1 9 1 1 0 1 0 0 8 1 1 0 0 1 1 7 1 1 0 0 1 0 6 1 1 0 0 0 1 5 1 1 0 0 0 0 4 1 0 1 1 1 1 3 1 0 1 1 1 0 2 1 0 1 1 0 1 1 1 0 1 1 0 0 0 1 0 1 0 1 1 -1 1 0 1 0 1 0 -2 1 0 1 0 0 1 -3 1 0 1 0 0 0 -4 1 0 0 1 1 1 -5 1 0 0 1 1 0 -6 1 0 0 1 0 1 -7 1 0 0 1 0 0 -8 1 0 0 0 1 1 -9 1 0 0 0 1 0 -10 1 0 0 0 0 1 -11 1 0 0 0 0 0
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 13 - March, 2006 Sound Fader Controller IC PT2318 The loudness characteristic is constant during the volume range from -12dB to -31 dB. GV (dB) V5 V4 V3 V2 V1 V0 -12 0 1 1 1 1 1 -13 0 1 1 1 1 0 -14 0 1 1 1 0 1 -15 0 1 1 1 0 0 -16 0 1 1 0 1 1 -17 0 1 1 0 1 0 -18 0 1 1 0 0 1 -19 0 1 1 0 0 0 -20 0 1 0 1 1 1 -21 0 1 0 1 1 0 -22 0 1 0 1 0 1 -23 0 1 0 1 0 0 -24 0 1 0 0 1 1 -25 0 1 0 0 1 0 -26 0 1 0 0 0 1 -27 0 1 0 0 0 0 -28 0 0 1 1 1 1 -29 0 0 1 1 1 0 -30 0 0 1 1 0 1 -31 0 0 1 1 0 0 The steps are repeated for range -28dB to -31dB. GV(dB) V5 V4 V3 V2 V1 V0 -28 0 0 1 0 1 1 -29 0 0 1 0 1 0 -30 0 0 1 0 0 1 -31 0 0 1 0 0 0 -28 0 0 0 1 1 1 -29 0 0 0 1 1 0 -30 0 0 0 1 0 1 -31 0 0 0 1 0 0 -28 0 0 0 0 1 1 -29 0 0 0 0 1 0 -30 0 0 0 0 0 1 -31 0 0 0 0 0 0
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 14 - March, 2006 Sound Fader Controller IC PT2318 The Volume 2 (Balance & Fader) Setting is shown below. FSR5 FSR4 FSR3 FSR2 FSR1 FSR0 FSR5 FSR4 FSR3 FSR2 FSR1 FSR0 FFL5 FFL4 FFL3 FFL2 FFL1 FFL0 GV (dB) FFR5 FFR4 FFR3 FFR2 FFR1 FFR0 0 1 1 1 1 1 1 -1 1 1 1 1 1 0 -2 1 1 1 1 0 1 -3 1 1 1 1 0 0 -4 1 1 1 0 1 1 -5 1 1 1 0 1 0 -6 1 1 1 0 0 1 -7 1 1 1 0 0 0 -8 1 1 0 1 1 1 -9 1 1 0 1 1 0 -10 1 1 0 1 0 1 -11 1 1 0 1 0 0 -12 1 1 0 0 1 1 -13 1 1 0 0 1 0 -14 1 1 0 0 0 1 -15 1 1 0 0 0 0 -16 1 0 1 1 1 1 -17 1 0 1 1 1 0 -18 1 0 1 1 0 1 -19 1 0 1 1 0 0 -20 1 0 1 0 1 1 -21 1 0 1 0 1 0 -22 1 0 1 0 0 1 -23 1 0 1 0 0 0 -24 1 0 0 1 1 1 -25 1 0 0 1 1 0 -26 1 0 0 1 0 1 -27 1 0 0 1 0 0 -28 1 0 0 0 1 1 -29 1 0 0 0 1 0 -30 1 0 0 0 0 1 -31 1 0 0 0 0 0 -32 0 1 1 1 1 1 -33 0 1 1 1 1 0 -34 0 1 1 1 0 1 -35 0 1 1 1 0 0
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 15 - March, 2006 Sound Fader Controller IC PT2318 FSR5 FSR4 FSR3 FSR2 FSR1 FSR0 FSR5 FSR4 FSR3 FSR2 FSR1 FSR0 FFL5 FFL4 FFL3 FFL2 FFL1 FFL0 GV (dB) FFR5 FFR4 FFR3 FFR2 FFR1 FFR0 -36 0 1 1 0 1 1 -37 0 1 1 0 1 0 -38 0 1 1 0 0 1 -39 0 1 1 0 0 0 -40 0 1 0 1 1 1 -41 0 1 0 1 1 0 -42 0 1 0 1 0 1 -43 0 1 0 1 0 0 -44 0 1 0 0 1 1 -45 0 1 0 0 1 0 -46 0 1 0 0 0 1 -47 0 1 0 0 0 0 -48 0 0 1 1 1 1 -49 0 0 1 1 1 0 -50 0 0 1 1 0 1 -51 0 0 1 1 0 0 -52 0 0 1 0 1 1 -53 0 0 1 0 1 0 -54 0 0 1 0 0 1 -55 0 0 1 0 0 0 MUTE 0 0 0 1 1 1 MUTE 0 0 0 1 1 0 MUTE 0 0 0 1 0 1 MUTE 0 0 0 1 0 0 MUTE 0 0 0 0 1 1 MUTE 0 0 0 0 1 0 MUTE 0 0 0 0 0 1 MUTE 0 0 0 0 0 0 Note: Only the subaddress changes, the data remains the same for a particular range.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 16 - March, 2006 Sound Fader Controller IC PT2318 Bass setting is shown below. GBASS (dB) BAS4 BAS3 BAS2 BAS1 BAS0 +15.0 1 1 1 1 1 +13.5 1 1 1 1 0 +15.0 1 1 1 0 1 +13.5 1 1 1 0 0 +15.0 1 1 0 1 1 +13.5 1 1 0 1 0 +12.0 1 1 0 0 1 +10.5 1 1 0 0 0 +9.0 1 0 1 1 1 +7.5 1 0 1 1 0 +6.0 1 0 1 0 1 +4.5 1 0 1 0 0 +3.0 1 0 0 1 1 +1.5 1 0 0 1 0 0 (see note 1) 1 0 0 0 1 0 (see note 2) 1 0 0 0 0 -1.5 0 1 1 1 1 -3.0 0 1 1 1 0 -4.5 0 1 1 0 1 -6.0 0 1 1 0 0 -7.5 0 1 0 1 1 -9.0 0 1 0 1 0 -10.5 0 1 0 0 1 -12.0 0 1 0 0 0 -13.5 0 0 1 1 1 -15.0 0 0 1 1 0 -13.5 0 0 1 0 1 -15.0 0 0 1 0 0 (see note 3) 0 0 0 1 1 (see note 3) 0 0 0 1 0 (see note 3) 0 0 0 0 1 (see note 3 & 4) 0 0 0 0 0 Notes: 1. Recommended Data Word for step 0dB. 2. Result of 1.5dB boost and 1.5dB attenuation. 3. The last four bass control data words mute the bass response. 4. The last bass and treble control data words (00000) enable the external equalizer connection.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 17 - March, 2006 Sound Fader Controller IC PT2318 Treble setting is shown below. GTREBLE (dB) TRE4 TRE3 TRE2 TRE1 TRE0 +12.0 1 1 1 1 1 +10.5 1 1 1 1 0 +12.0 1 1 1 0 1 +10.5 1 1 1 0 0 +12.0 1 1 0 1 1 +10.5 1 1 0 1 0 +12.0 1 1 0 0 1 +10.5 1 1 0 0 0 +9.0 1 0 1 1 1 +7.5 1 0 1 1 0 +6.0 1 0 1 0 1 +4.5 1 0 1 0 0 +3.0 1 0 0 1 1 +1.5 1 0 0 1 0 0 (see note 1) 1 0 0 0 1 0 (see note 2) 1 0 0 0 0 -1.5 0 1 1 1 1 -3.0 0 1 1 1 0 -4.5 0 1 1 0 1 -6.0 0 1 1 0 0 -7.5 0 1 0 1 1 -9.0 0 1 0 1 0 -10.5 0 1 0 0 1 -12.0 0 1 0 0 0 (see note 3) 0 0 1 1 1 (see note 3) 0 0 1 1 0 (see note 3) 0 0 1 0 1 (see note 3) 0 0 1 0 0 (see note 3) 0 0 0 1 1 (see note 3) 0 0 0 1 0 (see note 3) 0 0 0 0 1 (see note 3 & 4) 0 0 0 0 0 Notes: 1. Recommended Data Word for step 0dB. 2. Result of 1.5dB boost and 1.5dB attenuation. 3. The last eight treble control data words select the treble output. 4. The last bass and treble control data words (00000) enable the external equalizer connection.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 18 - March, 2006 Sound Fader Controller IC PT2318 MUTE PT2318 provides three mute modes namely: 1. Zero Crossing Mode via the I 2C bus using 2 independent zero crossing detectors. 2. Fast Mute via Mute Pin 3. Fast Mute via I 2C Bus either by General Mute (GMU) or by Volume 2 Block Setting. The following table shows the setting for the Zero Crossing Mode and the General Mute Mode GMU ZCM Function 0 0 Direct MUTE off 0 1 MUTE off delayed until the next Zero Crossing 1 0 Direct MUTE 1 1 MUTE delayed until the next Zero Crossing Notes: 1. GMU=General Mute Bit (Mute control for all outputs) 2. ZCM=Zero Crossing Mode Bit The mute function is immediately performed if the ZCM=“0”. If ZCM=”1”, the mute is activated after changing the GMU bit. The actual mute switching is delayed until the next zero crossing of the audio frequency signal. The left and right audio channels are independent of each other, therefore, there are two built-in comparators controlling the independent mute switches. In order to avoid too much delay in mute switching when very low frequencies are processed, the maximum delay time is limited to a typical value of 100ms by an integrated timing circuit and an external capacitor. This timing circuit is triggered by the reception of a new data word for the switch function (including a GMU bit). After an external capacitor is discharged and charged, the muting switch follows the GMU bit if there was no zero crossing detected during that particular time. Externally controlling the mute function is possible. If the mute pin is set to Ground, all outputs are muted immediately (this is the hardware mute.). Please refer to the diagram below. MUTE HARDWARE MUTE SWITCH PT2318 The mute request overwrites all mute controls via the I2C bus for the time the pin is held at “LOW” level. The hardware mute function is ideal for Radio Data System applications. The zero crossing mute avoids modulation plops. This feature is advantageous when the changing presets and/or sources.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 19 - March, 2006 Sound Fader Controller IC PT2318 INPUT SIGNAL SELECTION VIA ZERO CROSS MUTE MODE A selection from the Input A (IN_L1) to Input B (IN_L2) Left Channels produces a modulation click at the time of the switching. This will depend on the difference between the signal values. Please refer to the diagram below for the zero cross function (L Channel Only) V t1 t2 (1) (2) (3) t Notes: 1. (1)=Output 2. (2)=Input 2 (IN_L2) 3. (3)=Input 1 (IN_L1) At t1, the maximum different between signals is 7Vp-p. At this point, a loud click can be heard. Using the zero cross detector, no modulation click is audible. LOUDNESS FUNCTION The Loudness Function is used in combination with Volume 1 Control Block and may be enabled or disabled via the I 2C Bus Control. Please refer to the table below for Loudness Function setting. Loudness Function LOFF Loudness On 0 Loudness Off 1 Note: LOFF=Loudness Function Control Bit
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 20 - March, 2006 Sound Fader Controller IC PT2318 ABSOLUTE MAXIMUM RATING Parameter Symbol Conditions Min. Max. Unit Supply voltage Vcc 0 10 V Operating temperature Topr -40 +85 ℃ Storage temperature Tstg -65 +150 ℃ Voltage at each pin (when Pin 2 as GND) Vpin 0 Vcc V
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=8.5V, Rs=600Ω, RL=10kΩ, CL=2.5nF, AC Coupled, f=1KHz, Ta=25℃, Gain Control: Gv=0dB, Bass=Linear, Treble=Linear, Fader=Off, Balance in Mid Position Loudness Off) Parameter Symbol Conditions Min. Typ. Max. Unit Supply voltage Vcc - 7.5 8.5 9.5 V Supply current Ic - - 26 32 mA Internal DC voltage (Input & Output) VDC - 3.75 4.0 4.25 V Max. voltage gain GVmax Rs=0Ω, RL=∞ 19 20 21 dB Input sensitivity Vi (rms) VO-2000mV, Gv=20dB - 200 - mV CKIN=220nF, CKVL=220nF, Zi=Zi(min) Low frequency (-1dB) 60 - - Hz CKIN=220nF, CKVL=220nF, Zi=Zi(min) Low frequency (-3dB) 30 - - Hz CKIN=220nF, CKVL=220nF, Zi=Zi(min) High frequency (-1dB) 20000 - - Hz Roll-off frequency fro CKIN=470nF, CKVL=220nF, Zi=Zi(typ) Low frequency (-3dB) 17 - - Hz Channel separation αcs Vi=2V, 250Hz to 10KHz 90 96 - dB 20Hz to 12.5KHz, Vi=100mV, Gv=20dB - 0.07 - % 20Hz to 12.5KHz, Vi=1V, Gv=0dB - 0.05 - % 20Hz to 12.5KHz, Vi=2V, Gv=0dB - 0.2 - % Total harmonic distortion THD 20Hz to 12.5KHz, Vi=2V, Gv=-10dB - 0.03 - % Ripple rejection RR Vr(rms)<200mV, f=100Hz - 62 - dB Vo=2.0V, Gv=0dB - 99 - dB Vo=2.0V, Gv=12dB - 91 - dB Signal to noise ratio S/N Vo=2.0V, Gv=12dB - 83 - dB Crosstalk αct Between bus input & signal outputs - 110 - dB Input impedance Zi - 22 30 40 KΩ
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 21 - March, 2006 Sound Fader Controller IC PT2318 Parameter Symbol Conditions Min. Typ. Max. Unit f=1KHz - 104 - dB Input isolation (One selected source to any other input) αs f=12.5KHz - 95 - dB THD<0.5%, Vcc=8.5V - 2.7 - V Max. input voltage (RMS value) Vi (rms) THD<0.5%, Vcc=7.5V - 2.3 - V Output impedance Zo - 130 220 Ω Output load resistance RL 10 - - KΩ Voltage gain (Source selector) Gv - 0 - dB Control Section (Source Selector not connected, Source Resistance=600Ω) Volume input 70 150 200 KΩInput impedance Zi Loudness input 20 30 40 KΩ Output impedance Zo - 130 220 Ω Output load resistance RL 2 - - K Ω Max. input voltage Vi(rms) THD<0.5% - 2.4 - V Gv=20dB - 120 220 µV Gv=0dB - 25 50 µV Gv=-66dB - 13 22 µV Noise output voltage Vno MUTE position - 13 - µV Total continuous control range - 106 - dB Recommended control range CRtot - 86 - dB Step range - 1 - dB Step resolution Gstep Step error between any adjoining step - - 1.0 dB Gv=+20 to -50dB - - 2 dB Attenuation set error ΔGa Gv=-51 to -66dB - - 3 dB Gain tracking error ΔGt Gv=+20 to -50dB - - 2 dB Mute attenuation MUTEatt 95 100 - dB Volume 1 Control + Loudness Continuous volume control range CRvol - 51 - dB Voltage gain Gv -31 - +20 dB Step resolution Gstep - 1 - dB f=40Hz - 15 - dB Max. loudness LBmax f=10KHz - 4 - dB
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 22 - March, 2006 Sound Fader Controller IC PT2318 Parameter Symbol Conditions Min. Typ. Max. Unit Bass Control Max. boost (Bass control) f=40Hz +14 +15 +16 dB Max. attenuation Gbass f=40Hz -14 -15 -16 dB Step resolution (Toggle switching) Gstep f=40Hz - 1.5 - dB Step error between any adjoining step Gstep f=40Hz - - 1 dB Treble Control Max. boost Gtreble f=15KHz +11 +12 +13 dB Max. attenuation Gtreble f=15KHz -11 -12 -13 dB Max. boost 2 Gtreble f>15KHz - - 15 dB Step resolution (Toggle switching) Gstep f=15KHz - 1.5 - dB Step error between any adjoining step Gstep f=15KHz - - 1 dB Volume 2 + Balance + Fader Controls Continuous attenuation (Fader & volume control) CR - 55 - dB Step resolution Gstep - 1 2 dB Attenuation set error Gstep - - 2 dB Hardware Mute Mute: Active Input level VSWLOW - 0.8 - V Zero Crossing Mute Discharger current Id - 0.6 - µA Charge current Ich -300 -150 - µA Delay switch level VSWDEL - 1.5 - V Delay time td Cm=10nF - 100 - ms Window for audio signal zero crossing detection Vwind - 50 - mV Muting at Power Supply Drop Supply drop for MUTE active Vccdrop 6.9 7 - V I2C Bus Control High level input voltage VIH 3.4 - 9.5 V Low level input voltage VIL -0.3 - +1.5 V
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 23 - March, 2006 Sound Fader Controller IC PT2318 APPLICATION CIRCUIT 16 17 32SDA SCL Input Source 4 (Left Channel) Input Source 3 (Left Channel) Input Source 2 (Left Channel) Input Source 1 (Left Channel) Input Source 1 (Right Channel ) Input Source 2 (Right Channel ) Input Source 3(Right Channel) Input Source 4 (Right Channel ) To OutputTo Output Mono Source Input Mute CKIN 150nF 10nF 8.2nF20K Ω 2.2K Ω 150nF 8.2nF 20K Ω 2.2K Ω CKVL 220nF 33nF 5.6nF CKVL 220nF 33nF 5.6nF MCUIC B u s 100 Fµ 47 Fµ PT2318 IN_L1 IN_L2 MONO IN_L3 MUTE IN_L4 SEL_l LOUD_L VOL1_L BAS1_L BAS2_L TRE_L FL_OUT SL_OUT GND IN_R1 IN_R2 CAP IN_R3 VREF IN_R4 SEL_R LOUD_R VOL1_R BAS1_R BAS2_R TRE_R FR_OUT SR_OUT VCC
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 24 - March, 2006 Sound Fader Controller IC PT2318 ORDER INFORMATION Valid Part Number Package Type Top Code PT2318-S 32 Pins, SOP, 300mil PT2318-S PT2318 32 Pins, DIP, 600mil PT2318
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 25 - March, 2006 Sound Fader Controller IC PT2318
PACKAGE INFORMATION
32 PINS, SOP, 300MIL
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 26 - March, 2006 Sound Fader Controller IC PT2318 Symbols Min. Nom. Max. A - - 0.104 A1 0.004 0.30 A2 0.082 0.088 0.094 b 0.014 0.016 0.020 b1 0.014 0.016 0.018 b2 0.026 0.028 0.032 c 0.007 0.008 0.0125 c1 0.007 0.008 0.010 D 0.812 0.818 0.824 E 0.292 0.296 0.299 e 0.050 BSC. H 0.405 0.412 0.419 L 0.021 0.031 0.041 α 0 ° 4 ° 8 ° 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. 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) 7. Controlling dimension: MILLIMETER. 8. N=Number of terminal position (N=32) 9. Refer to JEDEC MO-119 variation AC. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 27 - March, 2006 Sound Fader Controller IC PT2318
32 PINS, DIP, 600MIL
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2318 V1.2 - 28 - March, 2006 Sound Fader Controller IC PT2318 Symbol Min. Nom. Max. A 0.170 - 0.200 A1 0.015 - 0.050 B 0.016 - 0.022 B1 0.045 - 0.067 C 0.009 - 0.015 D 1.600 - 1.670 E 0.600 - 0.625 E1 0.530 - 0.560 e1 0.100 BSC. eA 0.600 BSC. L 0.120 - 0.150 α 0° - 15° Q 0.065 - 0.080 S 0.065 - 0.087 Notes: 1. Refer to applicable symbol list. 2. Dimension and tolerancing per ANSI Y14.5-1982 3. αapplies to spread leads prior to installation. 4. N=Number of terminal position (N=32) 5. D & E1 does not include mold flash. Allowable flash is 0.010 per side. 6. Outlines on which the seating plane is coincident with the base plane (A1=0) terminal lead standoffs are not required, and B1 may equal B along any part of the lead above the seating/base plane. 7. Pin 1 identifier must be located in this area. 8. Controlling dimension: INCH. 9. Refer to JEDEC MO-015 variation AP. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.