Datasheet > AD7840KP-REEL

AD7840KP-REEL

更新时间： 2024-02-12 23:49:11

品牌	Logo	应用领域
亚德诺 - ADI		信息通信管理转换器
页数	文件大小	规格书
17页	430K
描述
Complete 14-Bit CMOS DAC

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技术参数
数据手册

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AD7840KP-REEL 技术参数

Source Url Status Check Date：	2013-05-01 14:56:20.958	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：	PLASTIC, LCC-28
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	最大模拟输出电压：	3 V
最小模拟输出电压：	-3 V	转换器类型：	D/A CONVERTER
输入位码：	BINARY	输入格式：	SERIAL, PARALLEL, WORD
JESD-30 代码：	S-PQCC-J28	JESD-609代码：	e0
长度：	11.5062 mm	最大线性误差 (EL)：	0.0061%
湿度敏感等级：	1	标称负供电电压：	-5 V
位数：	14	功能数量：	1
端子数量：	28	最高工作温度：	70 °C
最低工作温度：		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 V
认证状态：	Not Qualified	座面最大高度：	4.57 mm
最大稳定时间：	4 µs	标称安定时间 (tstl)：	2.5 µs
子类别：	Other Converters	最大压摆率：	14 mA
标称供电电压：	5 V	表面贴装：	YES
技术：	BICMOS	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：	NOT SPECIFIED	宽度：	11.5062 mm
Base Number Matches：	1

AD7840KP-REEL 数据手册

AD7840

P IN CO NFIGURATIO NS

D IP /SSO P

P LCC

D /A SECTIO N

for external use, it should he decoupled to AGND with a 200 Ω

resistor in series with a parallel combination of a 10 µF tantalum

capacitor and a 0.1 µF ceramic capacitor.

T he AD7840 contains a 14-bit voltage mode D/A converter

consisting of highly stable thin film resistors and high speed

NMOS single-pole, double-throw switches. T he simplified cir-

cuit diagram for the DAC section is shown in Figure 1. T he

three MSBs of the data word are decoded to drive the seven

switches A–G. T he 11 LSBs switch an 11-bit R-2R ladder struc-

ture. T he output voltage from this converter has the same polar-

ity as the reference voltage, REF IN.

T he REF IN voltage is internally buffered by a unity gain ampli-

fier before being applied to the D/A converter and the bipolar

bias circuitry. T he D/A converter is configured and sealed for a

3 V reference and the device is tested with 3 V applied to REF

IN. Operating the AD7840 at reference voltages outside the

±5% tolerance range may result in degraded performance from

the part.

Figure 2. Internal Reference

EXTERNAL REFERENCE

In some applications, the user may require a system reference or

some other external reference to drive the AD7840 reference in-

put. Figure 3 shows how the AD586 5 V reference can be con-

ditioned to provide the 3 V reference required by the AD7840

REF IN. An alternate source of reference voltage for the

AD7840 in systems which use both a DAC and an ADC is to

use the REF OUT voltage of ADCs such as the AD7870 and

AD7871. A circuit showing this arrangement is shown in

Figure 20.

Figure 1. DAC Ladder Structure

INTERNAL REFERENCE

T he AD7840 has an on-chip temperature compensated buried

Zener reference (see Figure 2) which is factory trimmed to 3 V

±10 mV. T he reference voltage is provided at the REF OUT

pin. T his reference can be used to provide both the reference

voltage for the D/A converter and the bipolar bias circuitry. T his

is achieved by connecting the REF OUT pin to the REF IN pin

of the device.

T he reference voltage can also be used as a reference for other

components and is capable of providing up to 500 µA to an ex-

ternal load. T he maximum recommended capacitance on REF

OUT for normal operation is 50 pF. If the reference is required

Figure 3. AD586 Driving AD7840 REF IN

REV. B

–5–

1...3 4 567 8 9...17

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与AD7840KP-REEL相关器件

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AD7840KPZ-REEL	ADI	IC SERIAL, PARALLEL, WORD INPUT LOADING, 2.5 us SETTLING TIME, 14-BIT DAC, PQCC28, PLASTIC	获取价格
AD7840KPZ-RL	ADI	Complete 14-Bit CMOS DAC	获取价格
AD7840LN	ETC	14-Bit Digital-to-Analog Converter	获取价格
AD7840LP	ETC	14-Bit Digital-to-Analog Converter	获取价格
AD7840SE/883B	ETC	14-Bit Digital-to-Analog Converter	获取价格
AD7840SQ	ADI	LC2MOS Complete 14-Bit DAC	获取价格

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