Datasheet > AD574AKP

AD574AKP

更新时间： 2024-02-28 15:31:07

品牌	Logo	应用领域
罗彻斯特 - ROCHESTER		转换器
页数	文件大小	规格书
13页	1479K
描述
ADC, Successive Approximation, 12-Bit, 1 Func, 1 Channel, Parallel, Word Access, Bipolar, PQCC28, PLASTIC, LCC-28

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AD574AKP 技术参数

Source Url Status Check Date：	2013-05-01 14:56:14.638	是否无铅：	含铅
是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	QLCC	包装说明：	QCCJ, LDCC28,.5SQ
针数：	28	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.27	最大模拟输入电压：	10 V
最小模拟输入电压：	-10 V	最长转换时间：	35 µs
转换器类型：	ADC, SUCCESSIVE APPROXIMATION	JESD-30 代码：	S-PQCC-J28
JESD-609代码：	e0	长度：	11.5062 mm
最大线性误差 (EL)：	0.0122%	湿度敏感等级：	1
标称负供电电压：	-12 V	模拟输入通道数量：	1
位数：	12	功能数量：	1
端子数量：	28	最高工作温度：	70 °C
最低工作温度：		输出位码：	BINARY
输出格式：	PARALLEL, WORD	封装主体材料：	PLASTIC/EPOXY
封装代码：	QCCJ	封装等效代码：	LDCC28,.5SQ
封装形状：	SQUARE	封装形式：	CHIP CARRIER
峰值回流温度（摄氏度）：	225	电源：	5,+-12/+-15 V
认证状态：	Not Qualified	采样并保持/跟踪并保持：	SAMPLE
座面最大高度：	4.57 mm	子类别：	Analog to Digital Converters
最大压摆率：	40 mA	标称供电电压：	12 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	COMMERCIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	J BEND	端子节距：	1.27 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	30
宽度：	11.5062 mm

AD574AKP 数据手册

AD574A

GENERAL A/D CONVERTER INTERFACE

CONSIDERATIONS

to valid logic levels after the conversion cycle is completed. The

STS line goes high 600 ns after R/C goes low and returns low

300 ns after data is valid.

A typical A/D converter interface routine involves several

operations. First, a write to the ADC address initiates a conver-

sion. The processor must then wait for the conversion cycle to

complete, since most ADCs take longer than one instruction

cycle to complete a conversion. Valid data can, of course, only

be read after the conversion is complete. The AD574A provides

an output signal (STS) which indicates when a conversion is in

progress. This signal can be polled by the processor by reading

it through an external three-state buffer (or other input port).

The STS signal can also be used to generate an interrupt upon

completion of conversion, if the system timing requirements are

critical (bear in mind that the maximum conversion time of the

AD574A is only 35 microseconds) and the processor has other

tasks to perform during the ADC conversion cycle. Another

possible time-out method is to assume that the ADC will take

35 microseconds to convert, and insert a sufficient number of

“do-nothing” instructions to ensure that 35 microseconds of

processor time is consumed.

If conversion is initiated by a high pulse as shown in Figure 12,

the data lines are enabled during the time when R/C is high.

The falling edge of R/C starts the next conversion, and the data

lines return to three-state (and remain three-state) until the next

high pulse of R/C.

Figure 12. High Pulse for R/C—Outputs Enabled While R/C

High, Otherwise High-Z

Once it is established that the conversion is finished, the data

can be read. In the case of an ADC of 8-bit resolution (or less),

a single data read operation is sufficient. In the case of convert-

ers with more data bits than are available on the bus, a choice of

data formats is required, and multiple read operations are needed.

The AD574A includes internal logic to permit direct interface

to 8-bit or 16-bit data buses, selected by connection of the 12/8

input. In 16-bit bus applications (12/8 high) the data lines

(DB11 through DB0) may be connected to either the 12 most

significant or 12 least significant bits of the data bus. The re-

maining four bits should be masked in software. The interface

to an 8-bit data bus (12/8 low) is done in a left-justified format.

The even address (A0 low) contains the 8 MSBs (DB11 through

DB4). The odd address (A0 high) contains the 4 LSBs (DB3

through DB0) in the upper half of the byte, followed by four

trailing zeroes, thus eliminating bit masking instructions.

Table IV. Stand-Alone Mode Timing

Symbol Parameter

t_HRLLow R/C Pulse Width

Min Typ Max Units

250

t_DS

t_HDR

t_HL

STS Delay from R/C

Data Valid After R/C Low

Output Float Delay

600

150

t_HS

STS Delay After Data Valid 300

1000 ns

t_HRH

t_DDR

High R/C Pulse Width

Data Access Time

300

250

Usually the low pulse for R/C stand-alone mode will be used.

Figure 13 illustrates a typical stand-alone configuration for 8086

type processors. The addition of the 74F/S374 latches improves

bus access/release times and helps minimize digital feedthrough

to the analog portion of the converter.

It is not possible to rearrange the AD574A data lines for right

justified 8-bit bus interface.

Figure 14. AD574A Data Format for 8-Bit Bus

SPECIFIC PROCESSOR INTERFACE EXAMPLES

Z-80 System Interface

The AD574A may be interfaced to the Z-80 processor in an I/O

or memory mapped configuration. Figure 15 illustrates an I/O

or mapped configuration. The Z-80 uses address lines A0–A7 to

decode the I/O port address.

Figure 13. 8086 Stand-Alone Configuration

INTERFACING THE AD574A TO MICROPROCESSORS

The control logic of the AD574A makes direct connection to

most microprocessor system buses possible. While it is impos-

sible to describe the details of the interface connections for every

microprocessor type, several representative examples will be

described here.

An interesting feature of the Z-80 is that during I/O operations a

single wait state is automatically inserted, allowing the AD574A

to be used with Z-80 processors having clock speeds up to 4MHz.

For applications faster than 4 MHz use the wait state generator

in Figure 16. In a memory mapped configuration the AD574A

may be interfaced to Z-80 processors with clock speeds of up to

2.5 MHz.

–10–

REV. B

1...8 9 101112 13

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与AD574AKP相关器件

型号	品牌	获取价格	描述	数据表
AD574AKPZ	ADI	获取价格	暂无描述
AD574AKPZ-REEL	ADI	获取价格	IC,A/D CONVERTER,SINGLE,12-BIT,BIPOLAR,LLCC,28PIN
AD574AKX	ADI	获取价格	Complete 12-Bit A/D Converter
AD574AL	ADI	获取价格	Complete 12-Bit A/D Converter
AD574ALD	ADI	获取价格	Complete 12-Bit A/D Converter
AD574ALD/+	ROCHESTER	获取价格	1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP28, HERMETIC SEALED, SIDE B
AD574ALN	ADI	获取价格	Complete 12-Bit A/D Converter
AD574ALN	ROCHESTER	获取价格	ADC, Successive Approximation, 12-Bit, 1 Func, 1 Channel, Parallel, Word Access, Bipolar,
AD574ALNZ	ADI	获取价格	Complete 12-Bit A/D Converter
AD574ALP	ADI	获取价格	IC,A/D CONVERTER,SINGLE,12-BIT,BIPOLAR,LDCC,28PIN

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