The ADS7066 can operate as a single converter or in a system with multiple converters. System designers can take advantage of the simple, high-speed, enhanced-SPI serial interface by cascading converters in a daisy-chain configuration when multiple converters are used. No register configuration is required to enable daisy-chain mode. Figure 7-7 shows a typical connection of three converters in daisy-chain mode.

Figure 7-7 Multiple Converters Connected Using Daisy-Chain Mode

When the ADS7066 is connected in daisy-chain mode, the serial input data passes through the ADS7066 with a 24-SCLK delay, as long as CS is active. Figure 7-8 shows a detailed timing diagram of this mode. In Figure 7-8, the conversion in each converter is performed simultaneously.

Figure 7-8 Simplified Daisy-Chain Mode Timing

The ADS7066 supports daisy-chain mode for output data payloads up to 24 bits long; see the Output Data FormatOutput Data Format section for more details. If either the status flags or channel ID are appended (APPEND_STATUS ≠ 00b) and the CRC module is enabled (CRC_EN = 1b), then the serial input data does not pass through the ADS7066 and daisy-chain mode is disabled.