Specifications

Note that operating Tibbit #43-2 in extreme conditions (i.e., close to the absolute boundaries) for extended periods can lead to component aging, performance degradation, and premature failure.

Table 11 — Absolute Maximum Ratings

Supply voltage

–10V to +5.5V

CH1 to CH4 relative to GND

–120V to +120V

Differential voltage: CH1-to-CH2 and CH3-to-CH4

–210V to +210V

TX, RX, RTS, –MCLR lines

–0.3V to +5.5V

Operating temperature

–40°C to +85°C

ESD protection on analog I/O lines*

2.5kV

* While the analog lines have electrostatic discharge (ESD) protection capability (embedded in the ADC IC), Tibbo recommends that ESD precautions still be taken to avoid any performance degradation or permanent damage to the device. This specification has not been tested by Tibbo. The value is reproduced from the AD7323 ADC datasheet.

Table 12 — Nominal Electrical Characteristics

Input supply voltage

4.5VDC to 5.5VDC

Current consumption

20mA to 25mA

CH1 to CH4 relative to GND

–100V to +100V

Differential voltage: CH1-to-CH2 and CH3-to-CH4 (without GND connection)

–200V to +200V

Input resistance: CH1 through CH4 relative to GND

~98kΩ

Input resistance: CH1-to-CH2 or CH3-to-CH4 (differential)

~196kΩ

TX, RX, RTS, –MCLR lines, LOW state

0V to 0.8V

TX, RX, RTS, –MCLR lines, HIGH state

2V to 5V

Table 13 — Functional Characteristics (Verified @ 25°C)

Sampling mode

4 x single-ended channels OR 2 x differential channels

Single-ended input voltage range

–100V to +100V

Differential input voltage range

–200V to +200V

Common-mode input voltage (differential mode)1

–20VDC to +20VDC

Nominal output resolution

12-bit + 1-bit sign

Effective output resolution2

10-bit + 1-bit sign

Non-linearity @ full-scale and effective output resolution

< ±0.5%

Offset @ full-scale and effective output resolution (single-ended)

< 100mV

Offset @ full-scale and effective output resolution (differential)

< 200mV

Maximum sampling rate, one single-ended or differential channel enabled, ASCII or hexadecimal data output format3

500 samples per second

Maximum sampling rate, one single-ended channel enabled, binary data output format3

1,000 samples per second

Maximum sampling rate, two single-ended or differential channels enabled, ASCII or hexadecimal data output format3

200 sampling groups/second

Maximum sampling rate, two single-ended or differential channels enabled, binary data output format3

400 sampling groups/second

Maximum sampling rate, four single-ended channels enabled, ASCII or hexadecimal data output format3

100 sampling groups/second

Maximum sampling rate, four single-ended channels enabled, binary data output format3

200 sampling groups/second

Maximum delay between the sampling of two sequential channels in a group, binary data output format

~30 microseconds

Input resistance: CH1 to CH4 relative to GND

~98kΩ

Input resistance: CH1 to CH2 (differential)

~196kΩ

Input resistance: CH3 to CH4 (differential)

~196kΩ

  1. If the common-mode DC voltage in differential mode exceeds the specified values, the input voltage range (swing) cannot be as high as the differential input voltage range. Based on the application, exceeding the specified common-mode input voltage range will likely affect the input swing. In general, the maximum input swing will be narrowed by the amount of voltage in excess of the common-mode input voltage range to maintain the nominal input voltage thresholds.
    For example, if a sensor with a common-mode input voltage of 50VDC — exceeding the specified range by 30VDC — is connected to Tibbit #43-2 in the differential mode, the input swing will be reduced to –200V to +170V. For more information, refer to the "True-differential mode" section of the datasheet for the AD7323.
  2. During the quality control stage of production, Tibbit #43-2 is calibrated for linearity and resolution.
  3. Tibbo recommends that the binary output data format be used for high sampling rates. See Data Output Formats for more information.

Table 14 — Temperature Effect (Compared with Characteristics @ 25°C)

Maximum added error @ -40°C

±200mV @ Vin = 100V

Maximum added error @ +85°C

±200mV @ Vin = 100V

Table 15 — Serial Interface Characteristics

Interface type

UART

Flow control*

Standard RTS (no CTS)

Mode

Full duplex

Baudrate

230,400 (fixed)

Data bits

8 bits

Stop bits

1 bit

Parity

No

* All Tibbo Project PCBs support flow control for UART communications with only an RTS line. If you use Tibbit #43-2 on another platform whose CPU does not support flow control, the Tibbit's RTS line must be set to LOW to allow data flow out of the Tibbit permanently. Note that in such a case, the host CPU's buffer must be big enough to accommodate the desired sampling rate to avoid data loss or a buffer overflow.