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SSM2305-EVALZ 评估板

The SSM2305 features a high efficiency, low noise modulation scheme that does not require external LC output filters. The modu-lation provides high efficiency even at low output power. The SSM2305 operates with 90% efficiency at 1.3 W into 8 Ω or 83% efficiency at 2.2 W into 4 Ω from a 5.0 V supply and has an SNR of >98 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

The SSM2305 has a micropower shutdown mode with a maximum shutdown current of 30 nA. Shutdown is enabled by applying a Logic 0 to the SD pin. The device also includes pop-and-click suppression circuitry. This minimizes voltage glitches at the output during turn-on and turn-off, thus reducing audible noise on activation and deactivation.

The fully differential input of the SSM2305 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the dc input common-mode voltage is approximately VDD/2.

The SSM2305 has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification. PSRR is typically 60 dB at 217 Hz.

The default gain of the SSM2305 is 18 dB, but users can reduce the gain by using a pair of external resistors.

The SSM2305 is specified over the commercial temperature range (-40°C to +85°C). It is available in both an 8-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP) and an 8-lead mini small outline package (MSOP).

应用
特点
功能框图

Functional Block Diagram for SSM2305

芯片引脚定义图

技术指标
SNR (dB) 98dB THD+N (dB) +-94dB
Efficiency (%) 89% Pos Supply +2.5V to +5.5V
Output Power (W) 2.8W Supply Current 3.3mA
SSM2305 芯片订购指南
产品型号 产品状态 封装 引脚 温度范围
SSM2305-EVALZ 量产 评估板 工业
SSM2305CPZ-R2 量产 8 商业
SSM2305CPZ-REEL 量产 8 ld LFCSP (3x3mm) 8 商业
SSM2305CPZ-REEL7 量产 8 ld LFCSP (3x3mm) 8 商业
SSM2305RMZ-R2 量产 8 商业
SSM2305RMZ-REEL 量产 8 ld MSOP 8 商业
SSM2305RMZ-REEL7 量产 8 ld MSOP 8 商业
应用技术支持与电子电路设计开发资源下载
  1. ADC音频放大器系列SSM2305 数据手册DataSheet 下载 . PDF
  2. Advantiv 高级电视解决方案 . PDF
  3. Analog Devices, Inc. 美国模拟器件公司产品订购手册 .PDF
  4. ADI 美国模拟器件公司音频放大器选型指南 . PDF