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Part Number Package & Pins VDD Voltage (V)-min VDD Voltage (V)-max IDD, Supply Current (mA) TSTART-UP (μs) Output Power (mW) (RL=32Ω) Output Power (mW) (RL=2.5kΩ) Total Harmonic Distortion Plus Noise (%) Power Supply Rejection Ratio (dB) Output Noise (μV) Signal to Noise Ratio (dB) Output Offset Voltage (mV)
ALL
APA2171 TSSOP-14
SOP-14
3 3.6 10 500 20 2.1 0.001 80 8 108 5
APA2172 TSSOP-14
SOP-14
2.3 5.5 10 500 40 2.1 0.001 80 8 108 5
APA2172A TSSOP-14
SOP-14
2.3 5.5 10 500 60 2.1 0.001 80 8 108 5
APA2176/A TQFN4x4-20B
TSSOP-16
TQFN3x3-16
1.8 5.5 2 120 150 - 0.03 82 15 95 5
APA2177 WLCSP-16 2.4 5.5 2.5 4000 22 - 0.02 90 7 95 0.5
APA2171
Active
Stereo, Differential Input Cap-Free Line Driver

Features
  • Operating Voltage : 3V~3.6V
  • Differential Input
  • Ground Reference Output
- No Output Capacitor Required (for DC Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
  • Low Noise and THD+N
- SNR > 108dB
- Noise < 8µVrms
- THD+N < 0.02% at 20Hz~20kHz
  • Output Voltage Swing Can Reach 2.1Vrms/Ch into 2.5kΩ at VDD=3.3V
  • High PSRR : 80dB at 217Hz
  • Fast Start-up Time : 500µs
  • Integrate the De-Pop Circuitry
  • Thermal and Short-Circuit Protection
  • Surface-Mount Packaging
- SOP-14
- TSSOP-14
  • Lead Free and Green Devices Available (RoHS Compliant)

General Description
The APA2171 is a stereo, differential input, single supply, and cap-free line driver, which is available in SOP-14 and TSSOP-14 packages. The APA2171 is ground-reference output, and doesn’t need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, eliminating component height, and improving the low frequency response. The external gain setting is recommended using from ±1V/ V to ±10V/V. High PSRR provides increased immunity to noise and RF rectification. APA2171 has shutdown and under-voltage detector function for Depop solution. The APA2171 is capable of driving 2.1Vrms at 3.3V into 2.5kΩ load, and provides short-circuit and thermal protection.
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APA2172
Active
Stereo, Differential Input Cap-Free Line Driver

Features
  • Operating Voltage : 2.3V~5.5V
  • Differential Input
  • Ground Reference Output
- No Output Capacitor Required (for DC Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
  • Low Noise and THD+N
- SNR > 108dB
- Noise < 8µVrms
- THD+N < 0.02% at 20Hz~20kHz
  • Output Voltage Swing Can Reach 2.1Vrms/Ch into 2.5kΩ at VDD=3.3V
  • High PSRR : 80dB at 217Hz
  • Fast Start-up Time : 500µs
  • Integrate the De-Pop Circuitry
  • Thermal and Short-Circuit Protection
  • Surface-Mount Packaging
- SOP-14
- TSSOP-14
  • Lead Free and Green Devices Available (RoHS Compliant)

General Description
The APA2172 is a stereo, differential input, single supply, and cap-free line driver, which is available in SOP-14 and TSSOP-14 packages. The APA2172 is ground-reference output, and doesn’t need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, eliminating component height, and improving the low frequency response. The external gain setting is recommended using from ±1V/V to ±10V/V. High PSRR provides increased immunity to noise and RF rectification. APA2172 has shutdown and under-voltage detector function for Depop solution. The APA2172 is capable of driving 2.1Vrms at 3.3V into 2.5kΩ load, and provides short-circuit and thermal protection.
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APA2172A
Active
Stereo, Differential Input Cap-Free Line Driver

Features
  • Operating Voltage : 2.3V~5.5V
  • Differential Input
  • Ground Reference Output
- No Output Capacitor Required (for DC Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
  • Low Noise and THD+N
- SNR > 108dB
- Noise < 8µVrms
- THD+N < 0.02% at 20Hz~20kHz
  • Output Voltage Swing Can Reach 2.1Vrms/Ch into 2.5kΩ at VDD=3.3V
  • High PSRR : 80dB at 217Hz
  • Fast Start-up Time : 500µs
  • Integrate the De-Pop Circuitry
  • Thermal and Short-Circuit Protection
  • Surface-Mount Packaging
- SOP-14
- TSSOP-14
  • Lead Free and Green Devices Available (RoHS Compliant)

General Description
The APA2172A is a stereo, differential input, single supply, and cap-free line driver, which is available in SOP-14 and TSSOP-14 packages. The APA2172A is ground-reference output, and doesn’t need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, eliminating component height, and improving the low frequency response. The external gain setting is recommended using from ±1V/V to ±10V/V. High PSRR provides increased immunity to noise and RF rectification. APA2172A has shutdown and under-voltage detector function for Depop solution. The APA2172A is capable of driving 2.1Vrms at 3.3V into 2.5kΩ load, and provides short-circuit and thermal protection.
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APA2176/A
Active
270mW Stereo Cap-Free Headphone Driver

Features
  • No Output Capacitor Required
  • Dual Supply Voltage (PVDD>VDD)
- VDD=1.8 ~5.5V
- PVDD=2.2 ~ 5.5V
  • Meeting VISTA Requirements
  • Output Power
at 1% THD+N
- 200mW, at VDD=3.3V, PVDD=5.0V, RL=16Ω
- 55mW, at VDD=1.8V, PVDD=3.0V, RL=16Ω
at 10% THD+N
- 270mW, at VDD=3.3V, PVDD=5.0V, RL=16Ω
- 70mW, at VDD=1.8V, PVDD=3.0V, RL=16Ω
  • Less External Components Required
  • High PSRR : 80dB at 217Hz
  • Fast Start-Up Time : 120µs
  • Short-Circuit and Thermal Protection
  • Surface-Mount Package
- TQFN4x4-20B (with Enhanced Thermal Pad)
- TSSOP-16
- TQFN3x3-16 (with Enhanced Thermal Pad) (for APA2176A)
  • Lead Free and Green Devices Available (RoHS Compliant)

General Description
The APA2176/2176A is a stereo, fixed gain, and cap-free headphone driver which is available in TQFN4x4 20-pin, TQFN3x3 16-pin (APA2176A) or TSSOP-16 package. Dual supply voltage provides higher efficiency and better power ripple rejection. The APA2176/2176A is designed with ground-reference output and no need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, PCB’s space, and component height. The built-in gain setting can minimize the external component counts and save the PCB space. High PSRR provides increased immunity to noise and RF rectification. In addition to these features, a fast start-up time and small package size make the APA2176/2176A an ideal choice for portable multimedia devices. Moreover, the APA2176/2176A is also equipped other features. For example, at THD+N=1%, it is capable of driving 200mW at VDD=3.3V, PVDD=5.0V into 16Ω. In addition, it provides thermal and short circuit protections.
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APA2177
Active
25mW Stereo Cap-Free Headphone Driver

Features
  • Operating Voltage : 2.4V~5.5V
  • Supply Current
- IDD=2.1mA at VDD=3.6V
  • Low Shutdown Current
- IDD=0.7µA at VDD=3.6V
  • Ground Reference Output
- No Output Capacitor Required (for DC Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
  • Output Power
25mW/Ch into 16Ω at VDD=3.6V, THD+N=0.04%
20mW/Ch into 32Ω at VDD=3.6V, THD+N=0.02%
  • High PSRR : 90dB at 217Hz
  • Fast Start-Up Time : 4ms
  • Integrate the De-pop Circuitry
  • Thermal Protection
  • Surface-Mount Packaging
WLCSP1.6x1.6-16
TQFN3x3-16

General Description
The APA2177 is a stereo, fixed gain, single supply, and cap-free headphone driver, which is available in a WLCSP16 packages. The APA2177 is ground-reference output, and no need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, eliminating component height, and improving the low frequency response. The internal selectable gain (0dB or 6dB) can minimize the external component counts and save the PCB space. High PSRR provides increased immunity to noise and RF rectification. The APA2177 is capable of driving 25mW at 3.6V into 16Ω load and provides thermal protection.
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