Measurement Specialties USB-1616HS-2 block diagram, USB-1616HS-2 functional block diagram

USB-1616HS-2 User's Guide Functional Details

USB-1616HS-2 block diagram

Figure 6 shows a simplified block diagram of the USB-1616HS-2. This board provides all of the functional elements shown in the figure.

	16-bit	1 MHz
2	D/A converters	output clock

			8 diff/16 SE
			analog inputs		Programmable gain
		Analog channel	MUX		x1, x2,	amplifier
	16	input protection
					x5, x10, x20			16-bit, 1 MHz
		One TTL			x50, x100			A/D converter
	2		A
		trigger input						A
		One analog
					512-step
		input pacer clock					1 MHz
					random access
					channel/gain		input clock
					sequencer			1 MSample
8
		Two 16-bit				Sequencer reset		FIFO
	2							Data Buffer
		Timer outputs			Programmable
		Four 32-bit			sequencer
	2				timebase
8	2	counter inputs			1 µ s to 6 hours
	24	Three 8-bit	A
		DIO ports
				System		USB		USB port
			controller			controller
DSUB25F								External
Expansion connector
								power
			Configurable			Configurable		DC to DC
				PLD		EPROM		converter
								Connect the optional
								power supply
								if the USB cannot
								supply enough power.

Figure 6. USB-1616HS-2 functional block diagram

Synchronous I/O – mixing analog, digital, and counter scanning

The USB-1616HS-2 can read analog, digital, and counter inputs, while generating up to two analog outputs and digital pattern outputs at the same time. Digital and counter inputs do not affect the overall A/D rate because these inputs use no time slot in the scanning sequencer.

For example, one analog input channel can be scanned at the full 1 MHz A/D rate along with digital and counter input channels. Each analog channel can have a different gain, and counter and digital channels do not need additional scanning bandwidth as long as there is at least one analog channel in the scan group.

Digital input channel sampling is not done during the "dead time" of the scan period where no analog sampling is being done either.

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