The ADS7951SBDBT from Texas Instruments is a high-speed, 12-bit, 16-channel, analog-to-digital converter (ADC) with SPI. As an AI language model, I can give you a general guide for creating an application circuit, but the specifics would depend on your particular application needs. Here are the main components you'd need:

1. Power Supply: The ADS7951SBDBT operates with a single power supply between 2.7V and 5.25V. You should connect this to your power source with decoupling capacitors near the power pins to filter out noise.

2. Input Signals: This ADC provides 16 single-ended inputs. Depending on your application, you might need to add signal conditioning components (e.g., filters or amplifiers) to your input signals.

3. Voltage Reference: The ADS7951SBDBT has an internal reference, but it also allows an external reference through the REF pin if your application requires a specific reference voltage.

4. SPI Interface: The ADS7951SBDBT communicates through an SPI-compatible interface, which includes four lines: OUT, DIN, SILK, and CS. You'd need to connect these lines to the corresponding pins on your microcontroller or digital system.

5. Control Signals: You'll need to manage control signals like the chip select (CS) with your digital control circuit, which is usually a microcontroller.

6. Outputs: The digital outputs from the ADC are provided over the OUT line. Your digital system or microcontroller must be connected to this.

 Remember, this is a general guide. Your specific circuit might need other components based on your application needs. For instance, if you're dealing with high frequencies or noisy environments, you might need to add impedance matching, shielding, or more sophisticated signal conditioning.

Furthermore, when designing the PCB layout, follow good practices such as maintaining separation between digital and analog grounds, minimizing trace lengths, and using ground planes to reduce noise.

As always, consult the data sheet for the ADS7951SBDBT for the most accurate and detailed information. This will provide you with specifics about the chip's operation and any recommended circuit configurations.