DATASHEET HI7191 FN4138 Rev 8.00 24-Bit, High Precision, Sigma Delta A/D Converter June 1, 2006 The Intersil HI7191 is a monolithic instrumentation, sigma Features delta A/D converter which operates from 5V supplies. Both 20-Bit Resolution with No Missing Code the signal and reference inputs are fully differential for maximum flexibility and performance. An internal 0.0015% Integral Non-Linearity (Typ) Programmable Gain Instrumentation Amplifier (PGIA) 20mV to 2.5V Full Scale Input Ranges provides input gains from 1 to 128 eliminating the need for Internal PGIA with Gains of 1 to 128 external pre-amplifiers. The on-demand converter auto-calibrate function is capable of removing offset and gain Serial Data I/O Interface, SPI Compatible errors existing in external and internal circuitry. The on-board Differential Analog and Reference Inputs user programmable digital filter provides over 120dB of 60/50Hz noise rejection and allows fine tuning of resolution Internal or System Calibration and conversion speed over a wide dynamic range. The 120dB Rejection of 60/50Hz Line Noise HI7190 and HI7191 are functionally the same device, but the HI7190 has tighter linearity specs. Settling Time of 4 Conversions (Max) for a Step Input Pb-Free Plus Anneal Available (RoHS Compliant) The HI7191 contains a serial I/O port and is compatible with most synchronous transfer formats including both the Applications Motorola 6805/11 series SPI and Intel 8051 series SSR protocols. A sophisticated set of commands gives the user Process Control and Measurement control over calibration, PGIA gain, device selection, standby Industrial Weight Scales mode, and several other features. The On-chip Calibration Registers allow the user to read and write calibration data. Part Counting Scales Laboratory Instrumentation Ordering Information Seismic Monitoring TEMP. PART PART RANGE PKG. Magnetic Field Monitoring NUMBER MARKING (C) PACKAGE DWG. Related Literature HI7191IP HI7191IP -40 to 85 20 Ld PDIP E20.3 Technical Brief TB363 Guidelines for Handling and HI7191IPZ HI7191IPZ -40 to 85 20 Ld PDIP* E20.3 Processing Moisture Sensitive Surface Mount Devices (See Note) (Pb-free) (SMDs) HI7191IB HI7191IB -40 to 85 20 Ld SOIC M20.3 TB348 HI7190/1 Negative Full Scale Error vs HI7191IBZ HI7191IBZ -40 to 85 20 Ld SOIC M20.3 Conversion Frequency (See Note) (Pb-free) AN9504 A Brief Intro to Sigma Delta Conversion HI7191IBZ-T HI7191IBZ -40 to 85 20 Ld SOIC M20.3 (See Note) Tape and Reel TB329 Intersil Sigma Delta Calibration Technique (Pb-free) AN9505 Using the HI7190 Evaluation Kit HI7190EVAL Evaluation Kit TB331 Using the HI7190 Serial Interface NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets molding compounds/die attach materials and 100% AN9527 Interfacing HI7190 to a Microcontroller matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil AN9532 Using HI7190 in a Multiplexed System Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of AN9601 Using HI7190 with a Single +5V Supply IPC/JEDEC J STD-020. *Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications. FN4138 Rev 8.00 Page 1 of 25 June 1, 2006HI7191 Pinout HI7191 (PDIP, SOIC) TOP VIEW 1 20 MODE SCLK SDO 2 19 SYNC SDIO 3 18 RESET CS 4 17 OSC 1 DRDY 5 16 OSC 2 DGND 6 15 DV DD AV 7 14 AGND SS V 8 13 AV RLO DD V 9 12 V RHI INHI V 10 11 V CM INLO Functional Block Diagram V V RHI RLO AV DD REFERENCE INPUTS TRANSDUCER BURN-OUT CURRENT MODULATOR PGIA DIGITAL FILTER V INHI V 1 INLO 1-BIT D/A V CM CONTROL AND SERIAL INTERFACE UNIT SERIAL INTERFACE UNIT CONTROL REGISTER CLOCK GENERATOR OSC OSC DRDY RESET SYNC CS MODE S SDIO SDO 1 2 CLK FN4138 Rev 8.00 Page 2 of 25 June 1, 2006