Features Typical Values, TA = 25°C, V +=5V, V -=0V. Gain bandwidth 1 MHz Input voltage range (G= 0.096 V/V) -15V to +15V Core op-amp input offset voltage 100 µV (max) Supply current 2 mA (max) Gain (Attenuation Mode) 0.096 V/V, 0.192 V/V 0.384 V/V, 0.768 V/V Gain (AmplificationMode) 1 V/V, 2 V/V Gain Error 0.035% (max) Core op-amp PSRR 90 dB (min) CMRR 80 dB (min) Adjustable output common mode 1V to 4V Temperature range −40 to 125°C Package 14-Pin SOIC Description The LMP7312 is a digitally programmable variable gain amplifier/attenuator. Its wide input voltage range and superior precision make it a prime choice for applications requiring high accuracy such as data acquisition systems for IO modules in programmable logic control (PLC). The LMP7312 provides a differential output to maximize dynamic range and signal to noise ratio, thereby reducing the overall system error. It can also be configured to handle single ended input data converters by means of the VOCM pin (see application section for details). The inputs of LMP7312 can be configured in attenuation mode to handle large input signals of up to +/- 15V, as well as in amplification mode to handle current loops of 0-20mA and 4-20mA.The LMP7312 is equipped with a null switch to evaluate the offset of the internal amplifier. A guaranteed 0.035% maximum gain error (for all gains) and a maximum gain drift of 5ppm over the extended industrial temperature range (-40° to 125°C) make the LMP7312 very attractive for high precision systems even under harsh conditions. A low input offset voltage of 100µV and low voltage noise of 3µVpp give the LMP7312 a superior performance. The LMP7312 is fully specified from -40° to 125°C and is available in SOIC-14 package. Applications Signal conditioning AFE ±10V; ±5V; 0-5V; 0-10V; 0-20mA; 4-20mA Data Acquisition systems Motor control Instrument and process control Remote sensing Programmable automation control

LMP7312_DIFF ADC interface

Typical Application click for larger image LMP7312_DIFF ADC interface	Connection Diagram click for larger image
Typical Performance click for larger image PVOS distribution

Parameters Values Channels 1 Channels Input OutputType R-R In and Out Gain Bandwidth 1 MHz Slew Rate 1.4 Volts/usec Supply Min 4.5 Volt Supply Max 5.5 Volt Offset Voltage max, 25C 0.1 mV Supply Current Per Channel 2 mA PowerWise Rating 2 1000 uA/MHz Output Current 55 mA Voltage Noise 7.2 nV/root(Hz) Shut down No Feedback Type Voltage Av+1 BW 0.530 MHz Av+2 BW 0.28 MHz Special Features SPI Contrl, AFE, 15V Vcm Function VGA Temperature Min -40 deg C Temperature Max 125 deg C Automotive No PowerWise No

Datasheets

Title		Size	Date	Other Language
	LMP7312 Precision SPI-Programmable AFE with Differential/Single-Ended Input/Output	1025 Kbytes	18-Jun-10	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMP7312MA/NOPB RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 120 DIGI-KEY Worldwide 114 FARNELL Europe and Asia 73 NEWARK Americas 73	$3.30 each at 1K+ pcs	rail of 55
LMP7312MAX/NOPB RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$3.30 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMP7312.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMP7312 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMP7312MAEVAL/NOPB	Evaluation Board for the LMP7312	Full production Lead Free (RoHS)	Distributor Region Qty	CALL	N/A
Description: This evaluation board allows evaluating the LMP7312 in all configurations, such as differential and single ended output, attenuation and amplification mode. It is provided with an SPI command generator in order to program the internal configuration register. Moreover, the evaluation board can be easily interfaced with the ADC141S626 and ADC161S626 evaluation boards. Contents: Assembled LMP7312MAEVAL Board LMP7312 Evaluation Board User-guide

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMP7312MA/NOPB	129.551	SOIC NARROW	14	1	260	Detail	N/A	N/A	NSUZXYTTE# LMP7312 MA
LMP7312MAX/NOPB	129.551	SOIC NARROW	14	1	260	Detail	N/A	N/A	NSUZXYTTE# LMP7312 MA

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMP7312.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMP7312 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMP7312MA	VIP50CLZ3	0	5670	0	0	945000	4	268146330
LMP7312MAX	VIP50CLZ3	0	5670	0	0	945000	4	268146330

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMP7312.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMP7312 is located at RoHS Status.

LMP8358 Easy Detection of Shorts, Open Circuits, and Degraded Source Connections Loading video...

LMP8358 Easy Detection of Shorts, Open Circuits, and Degraded Source Connections Date: 2010-05-26 Length: 0:06:26