AD573JN/+

更新时间： 2024-01-09 19:22:19

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
8页	330K
描述
IC IC,A/D CONVERTER,SINGLE,10-BIT,BIPOLAR,DIP,20PIN, Analog to Digital Converter

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AD573JN/+ 技术参数

Source Url Status Check Date：	2013-05-01 14:56:14.576	是否无铅：	含铅
是否Rohs认证：	不符合	生命周期：	Active
零件包装代码：	DIP	包装说明：	DIP, DIP20,.3
针数：	20	Reach Compliance Code：	not_compliant
ECCN代码：	3A001.A.2.C	HTS代码：	8542.39.00.01
风险等级：	7.77	最大模拟输入电压：	5 V
最小模拟输入电压：	-5 V	最长转换时间：	30 µs
转换器类型：	ADC, SUCCESSIVE APPROXIMATION	JESD-30 代码：	R-CDIP-T20
JESD-609代码：	e0	长度：	25.4 mm
最大线性误差 (EL)：	0.0977%	标称负供电电压：	-15 V
模拟输入通道数量：	1	位数：	10
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：	BINARY, OFFSET BINARY	输出格式：	PARALLEL, WORD
封装主体材料：	CERAMIC, METAL-SEALED COFIRED	封装代码：	DIP
封装等效代码：	DIP20,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	5,-12/-15 V	认证状态：	Not Qualified
采样速率：	0.05 MHz	采样并保持/跟踪并保持：	SAMPLE
座面最大高度：	5.08 mm	子类别：	Analog to Digital Converters
标称供电电压：	5 V	表面贴装：	NO
技术：	BIPOLAR	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn63Pb37)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.62 mm
Base Number Matches：	1

AD573JN/+ 数据手册

AD573

Figure 4a shows how the converter zero may be offset by up to

±3 bits to correct the device initial offset and/or input signal

offsets. As shown, the circuit gives approximately symmetrical

adjustment in unipolar mode.

LSB DB0

DB1

PIN 1

IDENTIFIER

HBE

LBE

DB2

DIG COM

BIP OFF

DB3

DB4

AD573

TOP VIEW

(Not to Scale)

DB5

ANALOG COM

ANALOG IN

DB6

V–

DB7

DB8

CONVERT

V+

MSB DB9

Figure 2. AD573 Pin Connections

Full-Scale Calibration

The 5 kΩ thin-film input resistor is laser trimmed to produce a

current which matches the full-scale current of the internal

DAC—plus about 0.3%—when an analog input voltage of 9.990

volts (10 volts – 1 LSB) is applied at the input. The input resis-

tor is trimmed in this way so that if a fine trimming potentiom-

eter is inserted in series with the input signal, the input current

at the full-scale input voltage can be trimmed down to match

the DAC full-scale current as precisely as desired. However, for

many applications the nominal 9.99 volt full scale can be

achieved to sufficient accuracy by simply inserting a 15 Ω resis-

tor in series with the analog input to Pin 14. Typical full-scale

calibration error will then be within ±2 LSB or ±0.2%. If more

precise calibration is desired, a 50 Ω trimmer should be used

instead. Set the analog input at 9.990 volts, and set the trimmer

so that the output code is just at the transition between

11111111 10 and 11111111 11. Each LSB will then have a

weight of 9.766 mV. If a nominal full scale of 10.24 volts is de-

sired (which makes the LSB have a weight of exactly 10.00 mV),

a 100 Ω resistor and a 100 Ω trimmer (or a 200 Ω trimmer with

good resolution) should be used. Of course, larger full-scale

ranges can be arranged by using a larger input resistor, but lin-

earity and full-scale temperature coefficient may be compro-

mised if the external resistor becomes a sizeable percentage of

5 kΩ. Figure 3 illustrates the connections required for full-scale

calibration.

Figure 4a.

Figure 4. Offset Trims

Figure 4b.

Figure 5 shows the nominal transfer curve near zero for an

AD573 in unipolar mode. The code transitions are at the edges

of the nominal bit weights. In some applications it will be pref-

erable to offset the code transitions so that they fall between the

nominal bit weights, as shown in the offset characteristics.

Figure 5. AD573 Transfer Curve—Unipolar Operation

(Approximate Bit Weights Shown for Illustration, Nominal

Bit Weights ~ 9.766 mV)

This offset can easily be accomplished as shown in Figure 4b. At

balance (after a conversion) approximately 2 mA flows into the

Analog Common terminal. A 2.7 Ω resistor in series with this

terminal will result in approximately the desired 1/2 bit offset of

the transfer characteristics. The nominal 2 mA Analog Common

current is not closely controlled in manufacture. If high accu-

racy is required, a 5 Ω potentiometer (connected as a rheostat)

can be used as R1. Additional negative offset range may be ob-

tained by using larger values of R1. Of course, if the zero transi-

tion point is changed, the full-scale transition point will also

move. Thus, if an offset of 1/2 LSB is introduced, full-scale

trimming as described on the previous page should be done with

an analog input of 9.985 volts.

NOTE: During a conversion, transient currents from the Analog

Common terminal will disturb the offset voltage. Capacitive

decoupling should not be used around the offset network. These

transients will settle appropriately during a conversion. Capaci-

tive decoupling will “pump up” and fail to settle resulting in

conversion errors. Power supply decoupling, which returns to

analog signal common, should go to the signal input side of the

resistive offset network.

Figure 3. Standard AD573 Connections

Unipolar Offset Calibration

Since the Unipolar Offset is less than ±1 LSB for all versions of

the AD573, most applications will not require trimming. Figure

4 illustrates two trimming methods which can be used if greater

accuracy is necessary.

–4–

REV. A

1 2 345 6 7 8

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