Datasheet > ADC-674L/883

ADC-674L/883

更新时间： 2022-12-01 21:22:49

品牌	Logo	应用领域
村田 - MURATA		/
页数	文件大小	规格书
7页	193K
描述
A/D Converter, 12-Bit, 1 Func, CQCC28,

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ADC-674L/883 数据手册

ADC-674

12-Bit, μP-Compatible A/D Converter

Interface To An 8-Bit Data Bus

The 12/8 input will be tied either high or low in most applications. With 12/8

high, all 12 output lines become active simultaneously for interface to a 12- or

16-bit data bus. A₀is ignored. Taking 12/8 low organizes the output in two 8-bit

bytes, which are selected one at a time by A₀. This allows an 8-bit data bus to

be connected as shown below. A₀is normally tied to the LSB of the address

bus for storing the converter's output in two consecutive memory locations.

This two byte format is called "left justiﬁed data" for which a decimal point

is assumed to the left of byte 1. In addition, A₀may be toggled at any time

without damage to the converter. Break-before-make switching is guaranteed

between two data bytes, which assures that the outputs strapped together as

shown are never enabled at the same time.

tSSR

tHSR

tHRR

R/C

A₀

tSRR

tSAR

tHAR

STS

tHD

tHS

HIGH

DATA

VALID

DB11-DB0

IMPEDANCE

tDO

tHL

Figure 4. Read Cycle Timing

ADDRESS BUS

ADC-674 TIMING

STS

Symbol

Parameter, Read Mode

Access Time from CE

Min.

Typ.

Max.

150 nS

R/C

A₀

DB11 (MSB)

DB10

DB9

DB8

DB7

Data Valid after CE low

Output Float Delay

CS to CE Setup

25 nS

12/8

120 nS

50 nS

SSR

SRR

SAR

R/C to CE Setup

A₀to CE Setup

ADC-674

DATA

BUS

50 nS

DB6

DB5

Valid after CE Low

HSR

HRR

HAR

RIC High after CE Low

A₀Valid after CE Low

STS Delay after Data Valid

DB4

0 nS

30 nS

DB3

300 nS

DB2

DB1

DB0 (LSB)

Symbol

Parameter, Read Mode

STS Delay From CE

CE Pulse Width

Min.

Typ.

Max.

200 nS

DGND

DSC

50 nS

HEC

SSC

HSC

SRC

HRC

CS to CE Setup

CS Low during CE High

R/C to CE Setup

Figure 5. 8-Bit Data Bus Interface

R/C Low during CE High

A₀to CE Setup

SAC

A₀Valid during CD High

Conversion Time:

12-bit cycle

50 nS

HAC

6 μS

4 μS

8 μS

6 μS

8-bit cycle

DATEL

•

11 Cabot Boulevard, Mansﬁeld, MA 02048-1151 USA

•

Tel: (508) 339-3000

•

www.datel.com

•

e-mail: help@datel.com

20 Jan 2012 MDA_ADC-674.A02_D3 Page 6 of 7

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