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Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter Condition Specification

A/D converter Analog Devices AD7329

13-bit successive approximation type

Input ranges Software-selectable

per channel

 Differential: ±20 V, ±10 V, ±5 V (The voltage level on

each individual AIN input is limited to ±14 V.)

 SE: ±10 V, ±5 V, ±2.5 V, 0 V to 10 V

Number of channels 4 differential, 8 single-ended

Software-selectable

Input configuration Multiplexed

Channel gain queue 8 unique consecutive elements Software-selectable range for each channel

Absolute maximum input

voltage

CHx IN to GND

±25 V max (power on)

±12 V max (power off)

Input impedance 35 MΩ min

Input bandwidth (–3 dB) All input ranges 2 MHz typ

Input leakage current ±250 nA typ

Input capacitance 32 pf typ

Offset error drift 5 ppm/°C typ

Gain error drift 25 ppm/°C typ

Maximum working voltage

(signal + common mode)

±20 V ±14 V

±10 V ±11 V

±5 V ±5.5 V

Sample rate 1 S/s to 1 MS/s, software programmable

Sample clock source Internal A/D clock or AICKI

Burst mode Software-selectable, burst rate = 1µs

Throughput Software paced 33 S/s to 4000 S/s typ, system dependent

Scan to PC memory 1 MS/s max

Resolution 13 bits

A/D no missing codes

(uncalibrated)

Differential mode

13 bits

Single-ended mode 12 bits

CMRR 60hz 74 dB typ

Crosstalk SE mode, all ranges, 250 kHz

input signal

–62 dB typ

Differential mode, all ranges,

250 kHz input signal

–78 dB typ

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 24 25

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