This brief presents an element-level and power-efficient Ping-pong noise-shaping (NS) SAR ADC for miniature ultrasound probes in 3-D transesophageal echocardiography (TEE). It digitizes the signal inside the probe, which reduces the interference noise on the signal, and improves the robustness of signal transmission. A first-order NS SAR ADC with 7-bit capacitive digital-to-analog converter(CDAC), implemented to realize 10-bit resolution, effectively reduces the chip area. In addition, the ping-pong alternate sampling structure in ADC is proposed, which reduces driving capability requirement for analog front-end (AFE). A prototype has been fabricated in a 0.13μm BCD process, it consumes 1.13mW of power at the sampling frequency of 60MS/s from a 1.5 V supply, and a core area of about 0.022mm 2 is realized. An SNR of 53.79dB is achieved over a 100% bandwidth around the 5 MHz center frequency.