TWL60418-Channel High Quality Low-Power Audio Codec For Portable Applications | Interface | 2 | Active | The TWL6041 is an audio codec with a high level of integration providing analog audio codec functions for portable applications, as shown in . The device contains multiple audio analog inputs and outputs, as well as microphone biases and accessory detection. The device is connected to the OMAP 4 host processor through a proprietary PDM interface for audio data communication enabling partitioning with optimized power consumption and performance. Multichannel audio data is multiplexed to a single wire for downlink (PDML) and uplink (PDMUL).
The OMAP4 device provides the TWL6041 device with five PDM audio-input channels (DL0–DL4). Channels DL0–DL3 are connected to four parallel DAC channels multiplexed to stereo headphone (HSL, HSR), stereo speaker (HFL, HFR), and earpiece (EAR) or stereo line outputs (AUXL, AUXR).
The stereo headphone path has a low-power (LP) mode operating from a 32-kHz sleep clock to enable more than 100 hours of MP3 playback time. Very-high dynamic range of 104 dBA is achieved when using the system clock input and DAC path high-performance (HP) mode. Class-AB headphone drivers provide a 1-Vrms output and are ground centered for capless connection to a headphone, thus enabling system size and cost reduction. The earpiece driver is a differential class-AB driver with 2-Vrms capability to a typical 32-Ω load or 1.4-Vrms to a typical 16-Ω load.
Stereo speaker path has filterless class-D outputs with 1.5-W capability per channel. Additionally, the 4-Ω load is supported. For output-power maximization, supply connection to an external boost is supported. Speaker drivers also support hearing aid coil loads.
For vibrator and haptic feedback support, the TWL6041 device has two PWM channels with independent input signals from DL4 or I2C. Vibra drivers are differential H-bridge outputs, enabling fast acceleration and deceleration of vibra motor. An external driver for a hearing aid coil or a piezo speaker requiring high voltage can be connected to line outputs.
The TWL6041 supports three differential microphone inputs (MMIC, HMIC, and SMIC) and a stereo line-input (AFML, AFMR) multiplexed to two parallel ADCs. The PDM output from the ADCs is transmitted to the OMAP4 processor through UL0 and UL1. AFML, AFMR inputs can also be looped to analog outputs (LB0, LB1).
Two LDOs provide a voltage of 2.1 V to bias analog microphones (MBIAS and HBIAS). The maximum output current is 2 mA for each analog bias, allowing up to two microphones on one bias. Two LDOs provide a voltage of 1.8 V to 1.85 V to bias digital microphones (DBIAS1 and DBIAS2). One bias generator can bias several digital microphones at the same time, with a total maximum output current of 10 mA.
The TWL6041 device has an integrated negative charge pump and two LDOs (HS LDO and LS LDO) for high PSRR. The only external supply needed is 2.1 V, which is available from the 2.1-V DC-DC of TWL6030/6032 power-management IC (PMIC) in the OMAP4 system. By powering audio from low-noise 2.1-V DC-DC of low power consumption, high dynamic range and high output swing at the headset output are achieved. All other supply inputs can be directly connected to battery or system 1.8-V I/O.
Two integrated PLLs enable operation from a 12-, 19.2-, 26-, and 38.4-MHz system clock (MCLK) or, in LP playback mode, from a 32-kHz sleep clock (CLK32K). The frequency plan is based on a 48-kS/s audio data rate for all channels, and the host processor uses sample-rate converters to interface with different sample rates (for example, 44.1 kHz). In the specific case of low-power audio playback, the TWL6041 supports the 44.1-kS/s and 48-kS/s rates. Transitions between sample rates or input clocks are seamless.
Accessory plug and unplug detections are supported (PLUGDET). Some headsets have a manual switch for submitting send/end signal to the terminal through the microphone input pin. This feature is supported by a periodic accessory button press detection to minimize current consumption in sleep mode. Detection cycle properties can be programmed according to system requirements.
The TWL6041BSRS, when connected to OMAP4 and OMAP5 platform, includes SRS Audio Effects, SRS pre-processing solutions and SRS TruMedia as standard feature for Android ICS.
The TWL6041 is an audio codec with a high level of integration providing analog audio codec functions for portable applications, as shown in . The device contains multiple audio analog inputs and outputs, as well as microphone biases and accessory detection. The device is connected to the OMAP 4 host processor through a proprietary PDM interface for audio data communication enabling partitioning with optimized power consumption and performance. Multichannel audio data is multiplexed to a single wire for downlink (PDML) and uplink (PDMUL).
The OMAP4 device provides the TWL6041 device with five PDM audio-input channels (DL0–DL4). Channels DL0–DL3 are connected to four parallel DAC channels multiplexed to stereo headphone (HSL, HSR), stereo speaker (HFL, HFR), and earpiece (EAR) or stereo line outputs (AUXL, AUXR).
The stereo headphone path has a low-power (LP) mode operating from a 32-kHz sleep clock to enable more than 100 hours of MP3 playback time. Very-high dynamic range of 104 dBA is achieved when using the system clock input and DAC path high-performance (HP) mode. Class-AB headphone drivers provide a 1-Vrms output and are ground centered for capless connection to a headphone, thus enabling system size and cost reduction. The earpiece driver is a differential class-AB driver with 2-Vrms capability to a typical 32-Ω load or 1.4-Vrms to a typical 16-Ω load.
Stereo speaker path has filterless class-D outputs with 1.5-W capability per channel. Additionally, the 4-Ω load is supported. For output-power maximization, supply connection to an external boost is supported. Speaker drivers also support hearing aid coil loads.
For vibrator and haptic feedback support, the TWL6041 device has two PWM channels with independent input signals from DL4 or I2C. Vibra drivers are differential H-bridge outputs, enabling fast acceleration and deceleration of vibra motor. An external driver for a hearing aid coil or a piezo speaker requiring high voltage can be connected to line outputs.
The TWL6041 supports three differential microphone inputs (MMIC, HMIC, and SMIC) and a stereo line-input (AFML, AFMR) multiplexed to two parallel ADCs. The PDM output from the ADCs is transmitted to the OMAP4 processor through UL0 and UL1. AFML, AFMR inputs can also be looped to analog outputs (LB0, LB1).
Two LDOs provide a voltage of 2.1 V to bias analog microphones (MBIAS and HBIAS). The maximum output current is 2 mA for each analog bias, allowing up to two microphones on one bias. Two LDOs provide a voltage of 1.8 V to 1.85 V to bias digital microphones (DBIAS1 and DBIAS2). One bias generator can bias several digital microphones at the same time, with a total maximum output current of 10 mA.
The TWL6041 device has an integrated negative charge pump and two LDOs (HS LDO and LS LDO) for high PSRR. The only external supply needed is 2.1 V, which is available from the 2.1-V DC-DC of TWL6030/6032 power-management IC (PMIC) in the OMAP4 system. By powering audio from low-noise 2.1-V DC-DC of low power consumption, high dynamic range and high output swing at the headset output are achieved. All other supply inputs can be directly connected to battery or system 1.8-V I/O.
Two integrated PLLs enable operation from a 12-, 19.2-, 26-, and 38.4-MHz system clock (MCLK) or, in LP playback mode, from a 32-kHz sleep clock (CLK32K). The frequency plan is based on a 48-kS/s audio data rate for all channels, and the host processor uses sample-rate converters to interface with different sample rates (for example, 44.1 kHz). In the specific case of low-power audio playback, the TWL6041 supports the 44.1-kS/s and 48-kS/s rates. Transitions between sample rates or input clocks are seamless.
Accessory plug and unplug detections are supported (PLUGDET). Some headsets have a manual switch for submitting send/end signal to the terminal through the microphone input pin. This feature is supported by a periodic accessory button press detection to minimize current consumption in sleep mode. Detection cycle properties can be programmed according to system requirements.
The TWL6041BSRS, when connected to OMAP4 and OMAP5 platform, includes SRS Audio Effects, SRS pre-processing solutions and SRS TruMedia as standard feature for Android ICS. |
TX731616-channel 3-level or 8-channel 5-level transmitter with integrated transmit beamformer | Integrated Circuits (ICs) | 1 | Active | The TX7316 is a highly integrated, high-performance transmitter solution for ultrasound imaging system. The device has total 16 pulser circuits (PULS), 16 transmit/receive (T/R) switches, and supports both on-chip and off-chip beamformer (TxBF). The device also integrates on-chip floating power supplies that reduce the number of required high voltage power supplies.
The TX7316 (referred to as device in this data sheet) has a pulser circuit that generates three-level high voltage pulses (up to ±100 V) that can be used to excite multiple channels of an ultrasound transducer. The device supports total 8 outputs for 5-level mode and 16 outputs for 3-level mode. The maximum output current is configurable from 2.4 A to 0.6 A.
A T/R switch under OFF state protects the receiver circuit by providing high isolation between the high-voltage transmitter and the low-voltage receiver when the pulser is generating high-voltage pulses. When the transducer is receiving echo signals, the T/R switch turns ON and connects the transducer to the receiver. The ON/OFF operation of the T/R switch is either controlled by an external pin or controlled by on-chip beamforming engine in the device. The T/R switch offers 12-Ω impedance in the ON state.
Ultrasound transmission relies on the excitation of multiple transducer elements with the delay profile of the excitation across the different elements defining the direction of the transmission. Such an operation is referred to as transmit beamforming. The TX7316 supports staggered pulsing of the different channels, allowing for transmit beamforming. The device supports both off-chip and on-chip beamforming operation.
In the off-chip beamformer mode, the output transition of each pulser and TR switch ON/OFF operation is controlled by external control pins. To eliminate the effect of jitter from the external control signals, the device supports a synchronization feature. When the synchronization feature is enabled, the external control signals are latched using a low-jitter beamformer clock signal.
In the on-chip beamformer mode, the delay profile for the pulsing of the different channels is stored within the device. The device supports a transmit beamformer delay resolution of one beamformer clock period and a maximum delay of 213beamformer clock periods. An internal pattern generator generates the output pulse patterns based on pattern profiles stored in a profile RAM. Up to 16 beamforming profiles and 48/28 pattern profiles for 3/5-level mode can be stored in the profile RAM. On-chip beamforming mode reduces the number of control signals that must be routed from the FPGA to the device.
TX7316 is available in a 15-mm × 10-mm 216-pin NFBGA package (ZCX package) and is specified for operation from 0°C to 70°C.
The TX7316 is a highly integrated, high-performance transmitter solution for ultrasound imaging system. The device has total 16 pulser circuits (PULS), 16 transmit/receive (T/R) switches, and supports both on-chip and off-chip beamformer (TxBF). The device also integrates on-chip floating power supplies that reduce the number of required high voltage power supplies.
The TX7316 (referred to as device in this data sheet) has a pulser circuit that generates three-level high voltage pulses (up to ±100 V) that can be used to excite multiple channels of an ultrasound transducer. The device supports total 8 outputs for 5-level mode and 16 outputs for 3-level mode. The maximum output current is configurable from 2.4 A to 0.6 A.
A T/R switch under OFF state protects the receiver circuit by providing high isolation between the high-voltage transmitter and the low-voltage receiver when the pulser is generating high-voltage pulses. When the transducer is receiving echo signals, the T/R switch turns ON and connects the transducer to the receiver. The ON/OFF operation of the T/R switch is either controlled by an external pin or controlled by on-chip beamforming engine in the device. The T/R switch offers 12-Ω impedance in the ON state.
Ultrasound transmission relies on the excitation of multiple transducer elements with the delay profile of the excitation across the different elements defining the direction of the transmission. Such an operation is referred to as transmit beamforming. The TX7316 supports staggered pulsing of the different channels, allowing for transmit beamforming. The device supports both off-chip and on-chip beamforming operation.
In the off-chip beamformer mode, the output transition of each pulser and TR switch ON/OFF operation is controlled by external control pins. To eliminate the effect of jitter from the external control signals, the device supports a synchronization feature. When the synchronization feature is enabled, the external control signals are latched using a low-jitter beamformer clock signal.
In the on-chip beamformer mode, the delay profile for the pulsing of the different channels is stored within the device. The device supports a transmit beamformer delay resolution of one beamformer clock period and a maximum delay of 213beamformer clock periods. An internal pattern generator generates the output pulse patterns based on pattern profiles stored in a profile RAM. Up to 16 beamforming profiles and 48/28 pattern profiles for 3/5-level mode can be stored in the profile RAM. On-chip beamforming mode reduces the number of control signals that must be routed from the FPGA to the device.
TX7316 is available in a 15-mm × 10-mm 216-pin NFBGA package (ZCX package) and is specified for operation from 0°C to 70°C. |
