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HT8696,HT8697
HT8696,HT8697 is a dual-channel filter-free Class D audio power amplifier with anti-clipping distortion. Under the condition of VDD=8.5V, THD+N=10% and 4Ω load, it can continuously output 2×9.5W power rate. HT8697 can also work in Class AB mode, at VDD=8.5V, THD+N=10%, 4Ω load, can instantly output 2×9.0W power.
HT8696,HT8697 has anti-clipping distortion (ACF) output control function, which can detect and suppress the output signal clipping distortion (broken sound) caused by the input music and speech signal amplitude. At the same time, the chip also has ACF-Off mode configurable.
HT8696,HT8697 has anti-clipping distortion (ACF) output control function, which can detect and suppress the output signal clipping distortion (broken sound) caused by the input music and speech signal amplitude. At the same time, the chip also has ACF-Off mode configurable.
8696,HT8697 Description:
HT8696,HT8697 is a dual-channel filter-free Class D audio power amplifier with anti-clipping distortion. Under the condition of VDD=8.5V, THD+N=10% and 4Ω load, it can continuously output 2×9.5W power rate. HT8697 can also work in Class AB mode, at VDD=8.5V, THD+N=10%, 4Ω load, can instantly output 2×9.0W power.
HT8696,HT8697 has anti-clipping distortion (ACF) output control function, can detect and suppress the output signal clipping distortion (broken) caused by the input music, speech signal amplitude is too large, significantly improve the sound quality, create comfortable listening enjoyment, and protect the speaker from overload damage. At the same time, the chip also has ACF-Off mode configurable.
HT8696,HT8697 internal integrated filter-free digital modulation technology, can directly drive the speaker, and minimize the distortion and noise of the pulse output signal. The output does not require a filter network, and very few external components save system space and cost, making it ideal for portable applications.
HT8697 can realize the free switching function of Class AB and Class D, and can switch to Class AB audio and frequency power amplifier mode at any time when it is troubled by Class D amplifier EMI interference.
In addition, the HT8696,7 built-in shutdown function minimizes the standby current, and also integrates the output overcurrent protection, on-chip overtemperature protection and power source undervoltage abnormal protection.
HT8696,HT8697 has anti-clipping distortion (ACF) output control function, can detect and suppress the output signal clipping distortion (broken) caused by the input music, speech signal amplitude is too large, significantly improve the sound quality, create comfortable listening enjoyment, and protect the speaker from overload damage. At the same time, the chip also has ACF-Off mode configurable.
HT8696,HT8697 internal integrated filter-free digital modulation technology, can directly drive the speaker, and minimize the distortion and noise of the pulse output signal. The output does not require a filter network, and very few external components save system space and cost, making it ideal for portable applications.
HT8697 can realize the free switching function of Class AB and Class D, and can switch to Class AB audio and frequency power amplifier mode at any time when it is troubled by Class D amplifier EMI interference.
In addition, the HT8696,7 built-in shutdown function minimizes the standby current, and also integrates the output overcurrent protection, on-chip overtemperature protection and power source undervoltage abnormal protection.
HT8696,HT8697 Features:
Anti-Clipping Function (ACF)
No filter digital modulation, directly drive speaker A
Output power
No filter digital modulation, directly drive speaker A
Output power
2×9.5W@ Class D, 2×9.0W@Class AB (VDD=8.5V, RL=4Ω, THD+N=10%,)
2×6.7W@ Class D or Class AB (VDD=7.2V, RL=4Ω, THD+N=10%)
Overcurrent protection function
Overheat protection
Undervoltage abnormal protection function
Lead-free halogen-free package, SOP16L-PP(HT8696),
TSSOP20L-PP(HT8697)
Overheat protection
Undervoltage abnormal protection function
Lead-free halogen-free package, SOP16L-PP(HT8696),
TSSOP20L-PP(HT8697)
HT8696,HT8697 Applications:
Bluetooth speaker
Portable speaker
2.1 Channel small speaker
megaphone
iphone/ipod/ipod docking
Pull rod speaker
Tablets, laptops
Portable game console
Small size LCD TV/monitor
MP4, navigator
Portable speaker
2.1 Channel small speaker
megaphone
iphone/ipod/ipod docking
Pull rod speaker
Tablets, laptops
Portable game console
Small size LCD TV/monitor
MP4, navigator
HT8696 Typical application diagram:
HT8697 Typical application diagram:
HT8696,HT8697 pin information :.
HT8696 pin definition :.
HT8697 pin definition :.
HT8696,HT8697 Ordering Information:
Note 2: WXYZ/UVWXYZ is a random code for internal production tracking.
HT8696,HT8697 Function description and application information:
input configuration
The HT8696,7 accepts an analog differential or single-ended audio signal input and produces a PWM pulse output signal to drive the speaker.
For differential inputs, the input is fed to the IN+ and IN- terminals through the isolating capacitor CIN and the input resistance RIN, respectively. System gain Av=1150k RIN (Class D mode for HT8696 and HT8697) or Av=500k RIN (Class AB mode for HT8697), input RC high-pass filter cutoff frequency fc 1 (2πRINCIN).
For single-ended inputs, they are coupled to the IN+ end via CIN. The In-terminal must be grounded through the input resistance and capacitance (same as CIN and RIN values). Enhanced Av and cutoff frequency fc are the same as for differential input.
Note The output impedance ZOUT of the front circuit of the system should not exceed 600Ω.
For differential inputs, the input is fed to the IN+ and IN- terminals through the isolating capacitor CIN and the input resistance RIN, respectively. System gain Av=1150k RIN (Class D mode for HT8696 and HT8697) or Av=500k RIN (Class AB mode for HT8697), input RC high-pass filter cutoff frequency fc 1 (2πRINCIN).
For single-ended inputs, they are coupled to the IN+ end via CIN. The In-terminal must be grounded through the input resistance and capacitance (same as CIN and RIN values). Enhanced Av and cutoff frequency fc are the same as for differential input.
Note The output impedance ZOUT of the front circuit of the system should not exceed 600Ω.
HT8696,HT8697 power amplifier output
In general, the output can be directly connected to the load horn. If the output line at the output end is long, or the EMI requirements are high, you can choose to add ferrite magnetic beads or LC filter (Class D).
In addition, if the power supply voltage is large (> 8.5V), the ripple is serious, or the input signal amplitude is large (≥1.0Vrms), or the load horn impedance is small (< 4Ω), it is necessary to increase the power capacitor (at least 100uF), and add the Snubber circuit and Schottky diode at the output end (Figure 2). Prevent chip exceptions.
In general, the output can be directly connected to the load horn. If the output line at the output end is long, or the EMI requirements are high, you can choose to add ferrite magnetic beads or LC filter (Class D).
In addition, if the power supply voltage is large (> 8.5V), the ripple is serious, or the input signal amplitude is large (≥1.0Vrms), or the load horn impedance is small (< 4Ω), it is necessary to increase the power capacitor (at least 100uF), and add the Snubber circuit and Schottky diode at the output end (Figure 2). Prevent chip exceptions.
Recommended parameters:
Rs: 1.5 ~ 2Ω；
Cs: 330pF~680pF；
Ds: forward average current ≥2A; Forward surge peak current ≥6A; Forward voltage (IF=1A) ≤0.38V.
ABD Mode Settings (HT8697 Only)
Input high level at ABDL or ABDR side, L channel or R channel of HT8697 is in Class D mode, system gain Av=1150k RIN.
Input low level at ABDL or ABDR side, L channel or R channel of HT8697 is in Class AB mode, system gain Av=500k RIN.
It should be noted that the ABDL and ABDR pins support suspension, and there is a pull-up resistor inside, with a resistance value of about 250kohm.
Input low level at ABDL or ABDR side, L channel or R channel of HT8697 is in Class AB mode, system gain Av=500k RIN.
It should be noted that the ABDL and ABDR pins support suspension, and there is a pull-up resistor inside, with a resistance value of about 250kohm.
CTRL mode setting
In Class D mode, input different voltage values at the CTRL terminal to realize 4 working modes, namely, anti-clipping mode 1 (ACF-1), anti-clipping mode 2 (ACF-2), anti-clipping function off mode (ACF-Off) and chip off mode (SD), as detailed in the following table.
CTRL mode function description
(1) ACF ON mode
(1) ACF ON mode
In ACF-1 and ACF-2 modes, when the circuit detects that the input signal amplitude is too large and the output clipping is generated, HT8696 and HT8697 control the output to reach a maximum power level without clipping distortion by automatically adjusting the system gain, thus greatly improving the sound quality. In addition, when the supply voltage drops, the HT8696 and HT8697 can also automatically attenuate the output gain to achieve a maximum unclipped output level matching the VDD drop value.
HT8697 Package information:
The Attack time in ACF ON mode is the time interval from ACF starting to adjust the gain of the amplifier until the gain decayed from Av0 to 3dB away from the target attenuation gain under the condition of sudden input of a sufficiently large signal to produce output clipping. Release time refers to the interval between the disappearance of the input condition that produced the clipping and the return of the gain to Av0 in the decay state. The HT8696,7 has a maximum attenuation gain of 16dB.
ACF-1 and ACF-2 modes have different start times and release times (see table below).
ACF-1 and ACF-2 modes have different start times and release times (see table below).
(2) ACF OFF mode
In ACF-OFF mode, the ACF function is turned Off, HT8696,7 does not detect the output clipping condition, nor does it automatically adjust the system gain, and the system gain is kept constant at Av=Av0=26dB. HT8696,7 May deteriorate due to broken output distortion.
(3) SD mode
In off mode (low power standby), the chip turns off all functions and reduces power consumption to a minimum, and the output is in a weak low state (ground internally through high resistance).
click - PFFP disappears
The HT8696,7 built-in control circuit achieves comprehensive noise suppression, effectively suppressing the transient Click-Pop noise that occurs during system power-on, power-off, shutdown and wake up operations.
In order to achieve a better clatter-crackle elimination effect, in general, it is recommended to use a linear isolation capacitor CIN of 0.1µF or less. At the same time, POP noise can also achieve minimal noise through the following timing control measures to turn off the mode during power-on and power-off: · When the power is powered on, maintain the off mode, and then release the off mode after the power is stable enough.
Set the power mode to off before powering off.
HT8696 Package information:Protection function
HT8696,HT8697 has the following protection functions: output overcurrent protection, on-chip overtemperature protection, power undervoltage abnormal protection.
(1) Overcurrent protection
When one output terminal is detected to the power supply, to the ground, or to the other output terminal short circuit, the overcurrent protection starts, and the output terminal switches to the high resistance state to prevent the chip from burning and damage. After the short circuit is eliminated, the chip can exit the protection mode by shutting off, waking up the chip once, or powering on the chip again.
(2) over-temperature protection
When the temperature in the chip is detected to exceed 150 ° C, the overtemperature protection is activated, and the positive and negative output terminals are switched to the weak low level state (internally through high resistance) to prevent the chip from being damaged by thermal breakdown.
(3) Undervoltage protection
When the VDD of the power supply is lower than VUVLL (1.9V), the undervoltage protection is activated, and the output terminal is in a weak low level state (internally grounded through high resistance). When the VDD is detected to be higher than VUVLH (2.2V), the protection mode is automatically released, and it enters the normal working state after the startup time TSTUP.
HT8697 Package information:
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