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USB-1208FS-Plus/LS/1408FS-Plus Series

Specifications

Noise Performance

USB-1208FS-Plus

Range

Typical Counts

Least Significant

BitRoot Mean Square

(LSBRMS)

Differential Mode

±20 V

2

0.30

±10 V

2

0.30

±5 V

3

0.45

±4 V

3

0.45

±2.5 V

4

0.61

±2 V

5

0.76

±1.25 V

7

1.06

±1 V

8

1.21

Single-Ended Mode

±10 V

2

0.30

USB-1408FS-Plus

Range

Typical Counts

Least Significant

BitRoot Mean Square

(LSBRMS)

Differential Mode

±20 V

8

1.21

±10 V

8

1.21

±5 V

9

1.36

±4 V

10

1.51

±2.5 V

12

1.81

±2 V

14

2.12

±1.25 V

18

2.72

±1 V

22

3.33

Single-Ended Mode

±10 V

8.0

1.21

Analog Output

Resolution: 12 bits, 1 in 4096

Output range: 0 V to 5 V

Number of channels: 2

Throughput

Software paced: 250 S/s single channel typ, system-dependent

Hardware paced: 50 kS/s max per channel

Power on and reset voltage: 0 V, ±20 mV typ, initializes to 000h code

Output drive (each D/A out): 5 mA, sourcing

Slew Rate: 0.8 V/µs typ

Accuracy, all values are (±), 0 V to 5 V: 4.0 LSB typ, 45.0 LSB max (accuracy

tested at no load)

Analog output accuracy components, all values are (±)

Range: 0 V to 5 V

% of FSR: 0.1 typ, 0.9 max

Gain error at full scale: 4.0 mV typ, 36.0 mV max

Offset: 1.0 mV typ, 9.0 mV max

Zero-scale offsets may result in a fixed zero-scale error producing a dead-band

digital input code region. In this case, changes in digital input code of less than

0x040 may not produce a corresponding change in the output voltage. The

offset error is tested and specified at code 0x040.

Accuracy at FS: 4.0 mV typ, 45.0 mV max

Digital I/O

Digital type: CMOS

Number of I/O: 16 (Port A0 through A7, Port B0 through B7)

Configuration: 2 banks of 8 (port B is the high-current drive)

Pull-up/down configuration: All pins pulled up to 5 V via 47 kΩ resistors (default).

Change to pull-down using internal user-configurable jumpers.

Input high voltage: 2.0 V min, 5.5 V absolute max

Input low voltage: 0.8 V max, –0.5 V absolute min, 0 V recommended min

Output high voltage, port A: 4.4 V min (IOH = –20 µA), 3.84 V min

(IOH = –6.0 mA)

Output low voltage, port A: 0.1 V max (IOL = 20 µA), 0.33 V max

(IOL = 6.0 mA)

Output high voltage, port B: 4.4 V min (IOH = –50 µA), 3.76 V min

(IOH = –24.0 mA)

Output low voltage, port B: 0.1 V max (IOH = 50 µA), 0.44 V max

(IOH = 24.0 mA)

Power on and reset state: Input

External Trigger

Trigger source: External digital, TRIG_IN

Trigger mode: Edge or level sensitive; software-selectable for CMOS compatible

rising or falling edge, high or low level.

Trigger latency: 10 µs max

Trigger pulse width: 1 µs min

Input type: Schmitt trigger, 47 kΩ pull-down to ground

Schmitt trigger hysteresis: 1.01 V typ, 0.6 V min, 1.5 V max

Input high voltage threshold: 2.43 V typ, 1.9 V min, 3.1 V max

Input high voltage limit: 5.5 V absolute max

Input low voltage threshold: 1.42 V typ, 1.0 V min, 2.0 V max

Input low voltage limit: –0.5 V absolute min, 0 V recommended min

External Clock Input/Output

Pin name: SYNC

Pin type: Bidirectional

Direction (software-selectable)

Input (default): Receives A/D clock from external source. Active on rising edge.

Output: Outputs internal A/D clock. Active on rising edge.

Input clock rate

USB-1208FS-Plus: 50 kHz, max

USB-1408FS-Plus: 48 kHz, max

Clock pulse width

Input mode: 1 µs min

Output mode: 5 µs min

Input type: Schmitt trigger, 47 kΩ pull-down to ground

Schmitt trigger hysteresis: 1.01 V typ, 0.6 V min, 1.5 V max

Input high voltage threshold: 2.43 V typ, 1.9 V min, 3.1 V max

I

nput high voltage limit: 5.5 V absolute max

Input low voltage threshold: 1.42 V typ, 1.0 V min, 2.0 V max

Input low voltage limit: –0.5 V absolute min, 0 V recommended min

Output high voltage: 4.4 V min (IOH = –50 µA), 3.80 V min (IOH = –8 mA)

Output low voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 8 mA)

Counter

Pin name: CTR

Counter type: Event counter

Number of channels: 1

Input type: Schmitt trigger, 47 kΩ pull-down to ground

Input Source: CTR screw terminal

Resolution: 32 bits

Maximum input frequency: 1 MHz

High pulse width: 500 ns min

Low pulse width: 500 ns min

Schmidt trigger hysteresis: 1.01 V typ, 0.6 V min, 1.5 V max

Input high voltage threshold: 2.43 V typ, 1.9 V min, 3.1 V max

Input high voltage limit: 5.5 V absolute max

Input Low voltage threshold: 1.42 V typ, 1.0 V min, 2.0 V max

Input low voltage limit: –0.5 V absolute min, 0 V recommended min

Non-Volatile Memory

EEPROM: 2,048 bytes (768 bytes calibration, 256 bytes user,1,024 bytes system data)