AD670: 8-Bit Signal Conditioning ADC

The AD670 is a complete 8-bit signal conditioning analog-to-digital converter. It consists of an instrumentation amplifier front end along with a DAC, comparator, successive approximation register (SAR), precision voltage reference, and a three-state output buffer on a single monolithic chip. No external components or user trims are required to interface, with full accuracy, an analog system to an 8-bit data bus. The AD670 will operate on the +5 V system supply. The input stage provides differential inputs with excellent common-mode rejection and allows direct interface to a variety of transducers.

The device is configured with input scaling resistors to permit two input ranges: 0 mV to 255 mV (1 mV/LSB) and 0 to 2.55 V (10 mV/LSB). The AD670 can be configured for both unipolar and bipolar inputs over these ranges. The differential inputs and common-mode rejection of this front end are useful in applications such as conversion of transducer signals superimposed on common-mode voltages.

The AD670 incorporates advanced circuit design and proven processing technology. The successive approximation function is implemented with I2L (integrated injection logic). Thin-film SiCr resistors provide the stability required to prevent missing codes over the entire operating temperature range while laser wafer trimming of the resistor ladder permits calibration of the device to within ±1 LSB. Thus, no user trims for gain or offset are required. Conversion time of the device is 10 us.

The AD670 is available in four package types and five grades. The J and K grades are specified over 0°C to +70°C and come in 20-pin plastic DIP packages or 20-terminal PLCC packages. The A and B grades (-40°C to +85°C) and the S grade (-55°C to +125°C) come in 20-pin ceramic DIP packages.

The S grade is also available with optional processing to MIL-STD-883 in 20-pin ceramic DIP or 20-terminal LCC packages. The Analog Devices Military Products Databook should be consulted for detailed specifications.

AD670 特点

Complete 8-Bit Signal Conditioning A/D Converter Including Instrumentation Amp and Reference
Microprocessor Bus Interface
10 us Conversion Speed
Flexible Input Stage: Instrumentation Amp Front End Provides Differential Inputs and High Common-Mode Rejection
No User Trims Required
No Missing Codes Over Temperature
Single +5 V Supply Operation
Convenient Input Ranges
20-Pin DIP or Surface-Mount Package
Low Cost Monolithic Construction
MIL-STD-883B Compliant Versions Available

AD670 功能框图

AD670 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
5962-8763501RA	量产	S/B OR B/B CERAMIC DIP	20	军用
AD670JN	量产	20 ld PDIP	20	商业
AD670JNZ	量产	20 ld PDIP	20	商业
AD670JP	量产	20 ld PLCC	20	商业
AD670JP-REEL	量产	20 ld PLCC	20	商业
AD670JPZ	量产	PLCC:PLASTIC LEAD CHIP CAR	20	商业
AD670JPZ-REEL7	量产	PLCC:PLASTIC LEAD CHIP CAR	20	商业
AD670KN	量产	20 ld PDIP	20	商业
AD670KNZ	量产	20 ld PDIP	20	商业
AD670KP	量产	20 ld PLCC	20	商业
AD670KPZ	量产	PLCC:PLASTIC LEAD CHIP CAR	20	商业
AD670SD/883B	量产	S/B OR B/B CERAMIC DIP	20	军用
AD670SE/883B	量产	LCC:CER LEADLESS CHIP CARR	20	军用