ADC122S706EB

更新时间： 2024-11-21 02:57:39

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
24页	557K
描述
Dual 12-Bit, 500 kSPS to 1 MSPS, Simultaneous Sampling A/D Converter

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ADC122S706EB 数据手册

November 16, 2007

ADC122S706

Dual 12-Bit, 500 kSPS to 1 MSPS, Simultaneous Sampling

A/D Converter

General Description

Features

The ADC122S706 is a dual 12-bit, 500 kSPS to 1 MSPS si-

multaneous sampling Analog-to-Digital (A/D) converter. The

analog inputs on both channels are sampled simultaneously

to preserve their relative phase information to each other. The

converter is based on a successive-approximation register

architecture where the differential nature of the analog inputs

is maintained from the internal track-and-hold circuits

throughout the A/D converter to provide excellent common-

mode signal rejection. The ADC122S706 features an external

reference that can be varied from 1.0V to V_A.

True Simultaneous Sampling Differential Inputs

■

Guaranteed performance from 500 kSPS to 1 MSPS

External Reference

Wide Input Common-Mode Voltage Range

Single or Dual High-Speed Serial Data Outputs

Operating Temperature Range of −40°C to +105°C

SPI™/QSPI™/MICROWIRE™/DSP compatible Serial

Interface

The ADC122S706 offers dual high-speed serial data outputs

that are binary 2's complement and are compatible with sev-

eral standards, such as SPI™, QSPI™, MICROWIRE™, and

many common DSP serial interfaces. Channel A's conversion

result is outputted on D_OUTAwhile Channel B's conversion re-

sult is outputted on D_OUTB. This feature makes the AD-

C122S706 an excellent replacement for systems using two

distinct ADCs in a simultaneous sampling application. The

serial clock (SCLK) and chip select bar (CS) are shared by

both channels. For lower power consumption, a single serial

data output mode is externally selectable.

Key Specifications

Conversion Rate

500 kSPS to 1 MSPS

±1 LSB (max)

■

INL

DNL

SNR

THD

±0.95 LSB (max)

71 dBc (min)

-72 dBc (min)

11.25 bits (min)

ENOB

Power Consumption at 1 MSPS

Converting, V_A= 5V, V_D= 3V

Converting, V_A= 5V, V_D= 5V

Power-Down

20 mW (typ)

25 mW (typ)

3 µW (typ)

—

The ADC122S706 may be operated with independent analog

(V_A) and digital (V_D) supplies. V_Acan range from 4.5V to 5.5V

and V_Dcan range from 2.7V to V_A. With the ADC122S706

operating with a V_Aof 5V and a V_Dof 3V, the power con-

sumption at 1 MSPS is typically 25 mW. Operating in power-

down mode, the power consumption of the ADC122S706

decreases to 3 µW. The differential input, low power con-

sumption, and small size make the ADC122S706 ideal for

direct connection to sensors in motor control applications.

Applications

Motor Control

■

Power Meters/Monitors

Multi-Axis Positioning Systems

Instrumentation and Control Systems

Data Acquisition Systems

Medical Instruments

■

Operation is guaranteed over the industrial temperature

range of −40°C to +105°C and clock rates of 8 MHz to 16 MHz.

The ADC122S706 is available in a 14-lead TSSOP package.

Direct Sensor Interface

Connection Diagram

30017105

TRI-STATE® is a trademark of National Semiconductor Corporation.

MICROWIRE™ is a trademark of National Semiconductor Corporation.

QSPI™ and SPI™ are trademarks of Motorola, Inc.

300171

www.national.com

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与ADC122S706EB相关器件

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ADC1241CIJ	NSC	获取价格	Self-Calibrating 12-Bit Plus Sign mP-Compatible A/D Converter with Sample-and-Hold
ADC1241CIJ/NOPB	TI	获取价格	1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP28, CERAMIC, DIP-28
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