A2327 AITSEMI | Alldatasheet
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AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 1 - DESCRIPTION FEATURES The A2327 is a 2.6W high efficiency filter-free class-D audio power amplifier that requires only three external components. Features like 88% efficiency, −75dB PSRR, and improved RF -rectification immunity make the A2327 ideal for cellular handsets. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the A2327. The A2327 is available in MSOP8, SOP8 and DFN8 packages.
ORDERING INFORMATION
SPQ: 3,000pcs/Reel MS8 A2327MS8R A2327MS8VR SOP8 SPQ: 2,500pcs/Reel A2327M8R A2327M8VR DFN8 SPQ: 3,000pcs/Reel J8 A2327J8R A2327J8VR Note V: Halogen free Package R: Tape & Reel AiT provides all RoHS products Efficiency With an 8Ω Speaker: 88% @ 400mW 80% @ 100mW 3.8mA Quiescent Current 0.4μA Shutdown Current Optimized PWM Output Stage Eliminates LC Output Filter Internally Generated 250kHz Switching Frequency Eliminates Capacitor and Resistor Improved PSRR (−75dB) and Wide Supply Voltage (2.5V to 5.5V) Eliminates Need for a Voltage Regulator Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor Improved CMRR Eliminates Two Input Coupling Capacitors Available in MSOP8, SOP8 and DFN8 packages APPLICATION Mobile phone、PDA、MID MP3/4、PMP Portable electronic devices TYPICAL APPLICATION
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 2 - PIN DESCRIPTION Top View Top View Top View Pin # Symbol Function
1 SDB Shutdown terminal (low active)
2 NC NC (No internal connection)
3 IN+ Positive differential input
4 IN- Negative differential input
5 VO+ Positive BTL output
6 VDD Power Supply
7 GND Power Ground
8 VO- Negative BTL output
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 3 - ABSOLUTE MAXIMUM RATINGS Supply Voltage -0.3V ~ 6V Input Voltage -0.3V ~ VDD+0.3V Storage Temperature -65℃ ~ +150℃ Operating Temperature Range -40℃ ~ +85℃ Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
The following specifications apply for the circuit shown in Figure 1. TA = 25°C, unless otherwise specified. Parameter Symbol Conditions Min. Typ. Max. Unit Shutdown Current ISD VIN=0V, VSDB=0V, No Load - 0.4 2 uA Quiescent Current IQ VDD=2.5V, VIN=0V, No Load - 2.2 3.2 mA VDD=3.6V, VIN=0V, No Load - 2.6 - VDD=5.5V, VIN=0V, No Load - 3.8 8 Output Offset Voltage |VOS| VIN=0V, AV=2V/V, VDD=2.5V to 5.5V - 2 25 mV Power Supply Rejection Ratio PSRR VDD=2.5V to 5.5V - -75 - dB Common Mode Rejection Ratio CMRR VDD=2.5V to 5.5V, VIC=VDD/2 to 0.5V, VIC=VDD/2 to VDD-0.8V - -68 - dB Modulation Frequency FSW VDD=2.5V to 5.5V 200 250 300 kHz Voltage Gain AV VDD=2.5V to 5.5V 270k RI 300k RI 330k RI V V Resistance from SDB to GND RSDB - 300 - kΩ Input Impedance ZI 135 150 165 kΩ Wake-up Time from Shutdown TWU VDD=3.6V - 32 - ms Drain-Source Resistance (on-state) RDS(ON) VDD=2.5V - 700 - mΩ VDD=3.6V - 500 - VDD=5.5V - 400 - Shutdown Voltage Input High VSDIH 1.3 - - V Shutdown Voltage Input Low VSDIL - - 0.4 V
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 4 - OPERATING CHARACTERISTICS VDD=5V, RI=150kΩ, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min. Typ. Max. Unit Output Power PO THD+N=10%, f=1kHz, RL=4Ω - 2.60 - W THD+N=1%, f=1kHz, RL=4Ω - 2.10 - THD+N=10%, f=1kHz, RL=8Ω - 1.60 - THD+N=1%, f=1kHz, RL=8Ω - 1.30 - Total Harmonic Distortion + Noise THD+N Po=1.0Wrms, f=1kHz, RL=8Ω - 0.21 - % Signal-to-Noise Ratio SNR VDD=5V, Po=1.0Wrms, RL=8Ω - 91 - dB VDD=3.6V, RI=150kΩ, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min. Typ. Max. Unit Output Power PO THD+N=10%, f=1kHz, RL=4Ω - 1.35 - W THD+N=1%, f=1kHz, RL=4Ω - 1.08 - THD+N=10%, f=1kHz, RL=8Ω - 0.85 - THD+N=1%, f=1kHz, RL=8Ω - 0.69 - Total Harmonic Distortion + Noise THD+N PO=0.5Wrms, f=1kHz, RL=8Ω - 0.21 - % Supply Ripple Rejection Ratio KSVR VDD=3.6V, input ac-grounded with CI=2uF, f=217Hz, V(Ripple)=200mVPP - -65 - dB Output Voltage Noise Vn VDD = 3.6V, input ac- grounded with CI=2uF, f=20~20kHz No weighting - 100 - uVRMS A weighting - 75 - Common Mode Rejection Ratio CMRR VDD=3.6V, VIC=1VPP, f=217Hz - -70 - dB VDD=2.5V, RI=150kΩ, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min. Typ. Max. Unit Output Power PO THD+N=10%, f=1kHz, RL=4Ω - 0.60 - W THD+N=1%, f=1kHz, RL=4Ω - 0.51 - THD+N=10%, f=1kHz, RL=8Ω - 0.40 - THD+N=1%, f=1kHz, RL=8Ω - 0.33 - Total Harmonic Distortion + Noise THD+N Po=0.2Wrms, f=1kHz, RL=8Ω - 0.21 - %
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 5 - TEST CIRCUIT Figure1. A2327 test set up circuit Figure2. 30kHz LPF for A2327 test NOTE1: CS should be placed as close as possible to VDD/GND pad of the device NOTE2: CI should be shorted for any Common-Mode input voltage measurement NOTE3: A 33uH inductor should be used in series with RL for efficiency measurement NOTE4: The 30kHz LPF (shown in figure 1) is required even if the analyzer has an internal LPF
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 6 - BLOCK DIAGRAM NOTE: Total Voltage Gain = Av1 x Av2 = 2 x 150k Ri
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 8 - Component Recommended Due to the weak noise immunity of the single -ended input application, the differential input application should be used whenever possible. The typical component values are listed in the table: RI CI CS 150k 3.3nF 2uF (1) CI should have a tolerance of ±10% or better to reduce impedance mismatch. (2) Use 1% tolerance resistors or better to keep the performance optimized, and place the R I close to the device to limit noise injection on the high-impedance nodes. Input Resistors (RI) & Capacitors (CI) The input resistors (RI) set the total voltage gain of the amplifier according to Formula 1. Gain = V V R 150kΩ x 2 I Formula 1 The input resistor matching directly affects the CMRR, PSRR, and the second harmonic distortion cancellation. If a differential signal source is used, and the signal is biased from 0.5V ~ V DD-0.8V (shown in Figure3), the input capacitor (CI) is not required. If the input signal is not biased within the recommended common -mode input range i n differential input application (shown in Figure4), or in a single -ended input application (shown in Figure5), the input coupling capacitors are required. If the input coupling capacitors are used, the RI and CI form a high-pass filter (HPF). The corner frequency (fC) of the HPF can be calculated by Formula 2 fC = HzCx R x 2 I I Formula 2 Decoupling Capacitor (CS) A good low equivalent -series-resistance (ESR) ceramic capacitor (C S), used as power supply decoupling capacitor (C S), is required for high power supply rejection (PSRR), high efficiency and low total harmonic distortion (THD). CS is 2μF, placed as close as possible to the device VDD pin.
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 9 -
PACKAGE INFORMATION
Dimension in SOP8 (Unit: mm)
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 10 - Dimension in MSOP8 (Unit: mm)
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 11 - Dimension in DFN8 (Unit: mm) Symbol Min Max A 0.70 0.80 A1 - 0.05 b 0.25 0.35 c 0.18 0.25 D 2.90 3.10 D2 2.50REF e 0.65BSC Nd 1.95BSC E 2.90 3.10 E2 1.55REF L 0.30 0.50 h 0.20 0.30
AiT Semiconductor Inc. www.ait-ic.com A2327 AUDIO AMPLIFIER 2.6W MONO FIL TER-FREE CLASS-D REV2.2 - NOV 2008 RELEASED, APR 2020 UPDATED - - 12 - IMPORTANT NOTICE AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to veri fy, before placing orders, that the information being relied on is current. AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life support applications, devices or systems o r other critical applications. Use of AiT products in such applications is understood to be fully at the risk of the customer. As used herein may involve potential risks of death, personal injury, or servere property, or environmental damage. In order to m inimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT warrants the performance of its products of the specifications applicable at the time of sale.