44引脚贴片单片机有哪些 STC12系列的60S2就是的好像，ATmega16/32好像也是
求一个V/F芯片 6引脚贴片封装 基础频率由单片机提供 可以实现2路电压信号的差分转换 谢谢！ AD654挺好用的~PRODUCT DESCRIPTIONThe AD654 is a monolithic V/F converter consisting of an inputamplifier，a precision oscillator system，and a high current outputstage.A single RC network is all that is required to set up anyfull scale(FS)frequency up to 500 kHz and any FS input voltageup to±30 V.Linearity error is only 0.03%for a 250 kHz FS，and operation is guaranteed over an 80 dB dynamic range.Theoverall temperature coefficient(excluding the effects of externalcomponents)is typically±50 ppm/°C.The AD654 operates froma single supply of 5 V to 36 V and consumes only 2.0 mA quies-cent current.The low drift(4 μV/°C typ)input amplifier allows operationdirectly from small signals such as thermocouples or strain gaugeswhile offering a high(250 M？)input resistance.Unlike mostV/F converters，the AD654 provides a square-wave output，andcan drive up to 12 TTL loads，optocouplers，long cables，orsimilar loads。
STC89C52RC贴片单片机的管脚如何排列？ 与同封装形式的其它厂家的89C52引脚完全兼容。具体参见下图：
