Описание
The HI7191 is a monolithic instrumentation, sigma delta A/D converter which operates from ±5V supplies. Both the signal and reference inputs are fully differential for maximum flexibility and performance. An internal Programmable Gain Instrumentation Amplifier (PGIA) provides input gains from 1 to 128 eliminating the need for external pre-amplifiers. The on-demand converter auto-calibrate function is capable of removing offset and gain errors existing in external and internal circuitry. The on-board user programmable digital filter provides over 120dB of 60/50Hz noise rejection and allows fine tuning of resolution and conversion speed over a wide dynamic range. The HI7190 and HI7191 are functionally the same device, but the HI7190 has tighter linearity specs. The HI7191 contains a serial I/O port and is compatible with most synchronous transfer formats including both the Motorola 6805/11 series SPI and Intel 8051 series SSR protocols. A sophisticated set of commands gives the user control over calibration, PGIA gain, device selection, standby mode, and several other features. The On-chip Calibration Registers allow the user to read and write calibration data.
- 20-Bit Resolution with No Missing Code
- 0.0015% Integral Non-Linearity (Typ)
- 20mV to ±2.5V Full Scale Input Ranges
- Internal PGIA with Gains of 1 to 128
- Serial Data I/O Interface, SPI Compatible
- Differential Analog and Reference Inputs
- Internal or System Calibration
- 120dB Rejection of 60/50Hz Line Noise
- Settling Time of 4 Conversions (Max) for a Step Input
- Pb-Free Plus Anneal Available (RoHS Compliant)
