Datasheet

Measurement Computing [phone]
4
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USB-1208HS Series
Specifications
Input Settling Time in µs, Typical
±Full-Scale Channel Switch,
Same-Range to Same-Range
Range ±1 LSB ±4 LSB ±8 LSB
±10 V 1.5 1.1 1.0
±5 V 2.1 1.1 1.0
±2.5 V 2.2 1.1 1.0
0 V to 10 V 2.6 1.1 1.0
Analog Output (USB-1208HS-2AO/USB-1208HS-4AO Only)
D/A converter: Texas Instruments DAC7553
Number of channels
USB-1208HS-2AO: 2 independent
USB-1208HS-4AO: 4 independent
Resolution: 12 bits
Output range
Calibrated: ±10 V
Uncalibrated: ±10.2 V
Output transient: Host PC is reset, powered on, suspended, or a reset command
is issued to device.
Duration: 3 ms typ
Amplitude: 6 V p‑p typ
D/A update rate
Software paced: 33 S/s to 5000 S/s typ, system‑dependent
Hardware paced: 1 MHz max (per channel)
Sample clock source: Internal D/A clock or AOCKI (AO external clock input pin)
Monotonicity: 12 bits
Output current: ±3 mA max per channel
Output short-circuit protection: Output connect to GND, unlimited duration
(10 mA typ)
Output coupling: DC
Power up and reset state: 0 V
Output noise: 0.53 mV rms
Settling time (to 0.05%): 20 V output step, (RL=5 kΩ, CL=200 pf), 5 µS max.
Absolute accuracy: ±0.1%
Slew rate: 6.7 V/µs typ
Offset error drift: 10 ppm/°C typ
Gain error drift: 65 ppm/°C typ
Digital I/O
Digital type: CMOS
Number of I/O: 16
Configuration: Each bit may be configured as input (power on default) or output
Pull-up/down configuration: The port has 47 kΩ resistors; jumper configurable
Digital I/O transfer rate (system paced): 33 to 8000 port reads/writes or single‑bit
reads/writes per second typ, system‑dependent
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: 4.4 V min (IOH = –50 µA), 3.76 V min (IOH = –24 mA)
Output low voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 24 mA)
Output current: ±24 mA max per terminal
External Scan Trigger Input
Trigger source: TRIG input (can trigger an A/D scan, a D/A scan, or both)
Trigger mode: Software‑selectable for edge‑ or level‑sensitive, rising or falling edge,
high or low level. Power on default is edge sensitive, rising edge.
Trigger latency: 1 µs + 1 clock cycle max
Trigger pulse width: 100 ns min
Input type: Schmitt Trigger, 33 Ω series resistor and 47 kΩ pull‑down to ground
Schmitt trigger hysteresis: 0.4 V to 1.2 V
Input high voltage: 2.2 V min, 5.5 V absolute max
Input low voltage: 1.5 V max, –0.5 V absolute min, 0 V recommended min
External Scan Clock I/O
Terminal names
USB-1208HS: AICKI, AICKO
USB-1208HS-2AO/1208HS-4AO: AICKI, AICKO, AOCKI, AOCKO
Terminal types
AxCKI: Input, active on rising edge
AxCKO: Output, power on default is 0 V, active on rising edge
Terminal descriptions
AxCKI: Receives sampling clock from external source
AxCKO: Outputs internal sampling clock (D/A or A/D clock) or pulse generated
from AxCKI when in external clock mode
Input clock rate: 1 MHz max
Clock pulse width
AxCKI: 400 ns min
AxCKO: 400 ns min
Input type: Schmitt trigger, 33 Ω series resistor, 47 kΩ pull‑down to ground
Schmitt trigger hysteresis: 0.4 V to 1.2 V
Input high voltage: 2.2 V min, 5.5 V absolute max
Input low voltage: 1.5 V max, –0.5 V absolute min, 0 V recommended min
Output high voltage: 4.4 V min (IOH = –50 µA), 3.76 V min (IOH = –24 mA)
Output low voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 24 mA)
Output current: ±24 mA max per terminal
Counters
Counter terminal names: CTR0, CTR1
Counter type: Event counter
Number of channels: 2
Input type: Schmitt trigger, 33 Ω series resistor, 47 kΩ pull‑down to ground
Schmitt trigger hysteresis: 0.4 V to 1.2 V
Input high voltage: 2.2 V min, 5.5 V absolute max
Input low voltage: 1.5 V max, –0.5 V absolute min, 0 V recommended min
Resolution: 32 bits
Max input frequency: 20 MHz
Counter read/write rates (software paced): 33 to 8000 reads/writes
per second typ, system‑dependent
High pulse width: 25 ns min
Low pulse width: 25 ns min
Timer
Timer terminal name: TMR
Timer type: PWM output with count, period, delay, and pulse width registers
Output value: Default state idle low, pulses high, software‑selectable output invert
Internal clock frequency: 40 MHz
Register widths: 32 bits
High pulse width: 20 ns min
Low pulse width: 20 ns min
Output high voltage: 4.4 V min (IOH = –50 µA), 3.76 V min (IOH = –24 mA)
Output low voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 24 mA)
Output current: ±24 mA max per pin
Power
Operating modes: Bus‑powered, USB 5 V supply
Supply current
Suspend mode: <2.5 mA
Enumeration: <100 mA
Run mode: <500 mA
Power consumption, excluding analog and digital outputs
Run mode
USB-1208HS: 1.05 W max (210 mA input current)
USB-1208HS-2AO: 1.125 W max (225 mA input current)
USB-1208HS-4AO: 1.175 W max (235 mA input current)
Power available for 5 V, AICKO, AOCKO, TMR, analog outputs, digital I/O
Run mode
USB-1208HS: 1.45 W max
USB-1208HS-2AO: 1.375 W max
USB-1208HS-4AO: 1.325 W max
The total power consumption for all external loads must be < this value; each
load must meet the individual specification for the terminal.
Digital output power calculation: Power per output = Iout * 5 V (example: @ 24 mA,
P = 0.024 * 5 = 120 mW/output)
Analog output power calculation: Power per output = (Iout * 16.5 V)/0.78 (example:
@ 3 mA, P = (0.003 * 16.5)/0.78 = 63.5 mW/output)
5 V output power calculation: Power (W) = Iout * 5 V
5 V output voltage range (assumes input power is within specified limits)
Run mode: 4.25 V min, 5.25 V max
Suspend mode, enumeration: 0 V
5 V output current
Run mode, no other output loads: 265 mA max (1.325 W)
Fuses (on USB supply): 0452.750 ‑ Littelfuse 0.750A NANO2® Slo‑Blo® Submin‑
iature Surface Mount Fuse. Spare fuse mounted in holder on PCB.