AD670KNZ

更新时间： 2024-02-24 18:58:01

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	366K
描述
IC 2-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP20, PLASTIC, DIP-20, Analog to Digital Converter

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AD670KNZ 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
Reach Compliance Code：	not_compliant	HTS代码：	8542.39.00.01
风险等级：	5.91	最大模拟输入电压：	2.55 V
转换器类型：	A/D CONVERTER	JESD-30 代码：	S-XQCC-N20
JESD-609代码：	e0	最大线性误差 (EL)：	0.4%
位数：	8	功能数量：	1
端子数量：	20	最高工作温度：	125 °C
最低工作温度：	-55 °C	输出位码：	OFFSET BINARY
封装主体材料：	CERAMIC	封装代码：	QCCN
封装等效代码：	LCC20,.35SQ	封装形状：	SQUARE
封装形式：	CHIP CARRIER	电源：	5 V
认证状态：	Not Qualified	子类别：	Analog to Digital Converters
标称供电电压：	5 V	表面贴装：	YES
技术：	BIPOLAR	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	NO LEAD
端子节距：	1.27 mm	端子位置：	QUAD
Base Number Matches：	1

AD670KNZ 数据手册

AD670

Table I. AD670 Input Selection/Output Format Truth Table

INPUT RANGE/

BPO/UPO

FORMAT

OUTPUT FORMAT

Unipolar/Straight Binary

Bipolar/Offset Binary

Unipolar/2s Complement

Bipolar/2s Complement

DIFF

V_IN

STRAIGHT BINARY

(FORMAT = 0, BPO/UPO = 0)

+V_IN

–V_IN

0000 0000

1000 0000

1111 1111

0000 0000

0000 0001

1111 1111

128 mV

255 mV

255 mV 255 mV

128 mV 127 mV

128 mV

255 mV

Figure 4a. CMRR Over Frequency

1 mV

128 mV –127 mV 255 mV

Figure 5a. Unipolar Output Codes (Low Range)

OFFSET BINARY 2s COMPLEMENT

DIFF

V_IN

(FORMAT = 0,

BPO/UPO = 1)

(FORMAT = 1,

BPO/UPO = 1)

+V_IN

–V_IN

1000 0000

1111 1111

1000 0000

1000 0001

0111 1111

0000 0000

0111 1111

0000 0000

0000 0001

1111 1111

1000 0000

127 mV

1 mV

–1 mV

–128 mV 0000 0000

1.127 V 1.000 V

255 mV 255 mV

128 mV 127 mV

127 mV 128 mV

127 mV 255 mV

Figure 4b. AD670 Input Rejects Common-Mode

Ground Noise

Good common-mode performance is useful in a number of situ-

ations. In bridge-type transducer applications, such performance

facilitates the recovery of differential analog signals in the pres-

ence of a dc common-mode or a noisy electrical environment.

High frequency CMRR also becomes important when the ana-

log signal is referred to a noisy, remote digital ground. In each

case, the CMRR specification of the AD670 allows the integrity

of the input signal to be preserved.

–128 mV

Figure 5b. Bipolar Output Codes (Low Range)

Calibration

Because of its precise factory calibration, the AD670 is intended

to be operated without user trims for gun and offset; therefore,

no provisions have been made for such user trims. Figures 6a,

6b, and 6c show the transfer curves at zero and full scale for the

unipolar and bipolar modes. The code transitions are positioned

so that the desired value is centered at that code. The first LSB

transition for the unipolar mode occurs for an input of +1/2 LSB

(5 mV or 0.5 mV). Similarly, the MSB transition for the bipolar

mode is set at –1/2 LSB (–5 mV or –0.5 mV). The full scale

transition is located at the full scale value –1 1/2 LSB. These

values are 2.545 V and 254.5 mV.

The AD670’s common-mode voltage tolerance allows great

flexibility in circuit layout. Most other A/D converters require

the establishment of one point as the analog reference point.

This is necessary in order to minimize the effects of parasitic

voltages. The AD670, however, eliminates the need to make the

analog ground reference point and A/D analog ground one and

the same. Instead, a system such as that shown in Figure 4b is

possible as a result of the AD670’s common-mode performance.

The resistors and inductors in the ground return represent un-

avoidable system parasitic impedances.

Input/Output Options

Data output coding (2s complement vs. straight binary) is

selected using Pin 12, the FORMAT pin. The selection of

input format (bipolar vs. unipolar) is controlled using Pin 11,

BPO/UPO. Prior to a write/convert, the state of FORMAT and

BPO/UPO should be available to the converter. These lines may

be tied to the data bus and may be changed with each conver-

sion if desired. The configurations are shown in Table I. Output

coding for representative signals in each of these configurations

is shown in Figure 5.

An output signal, STATUS, indicates the status of the conver-

sion. STATUS goes high at the beginning of the conversion and

returns low when the conversion cycle has been completed.

6a. Unipolar Transfer Curve

REV. A

–6–

1...3 4 567 8 9...12

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