AD7278BRMJ

更新时间： 2024-02-01 03:02:18

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器光电二极管
页数	文件大小	规格书
20页	254K
描述
3MSPS,12-/10-/8-Bit ADCs in 6-Lead TSOT

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技术参数
数据手册

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AD7278BRMJ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP,	针数：	8
Reach Compliance Code：	unknown	风险等级：	5.68
Is Samacsys：	N	最大模拟输入电压：	3.6 V
最小模拟输入电压：		最长转换时间：	0.291 µs
转换器类型：	ADC, SUCCESSIVE APPROXIMATION	JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e3	长度：	3 mm
最大线性误差 (EL)：	0.3906%	湿度敏感等级：	1
模拟输入通道数量：	1	位数：	8
功能数量：	1	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-40 °C
输出位码：	BINARY	输出格式：	SERIAL
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	采样速率：	3 MHz
采样并保持/跟踪并保持：	TRACK	座面最大高度：	1.1 mm
标称供电电压：	3 V	表面贴装：	YES
温度等级：	AUTOMOTIVE	端子面层：	MATTE TIN
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	3 mm	Base Number Matches：	1

AD7278BRMJ 数据手册

PRELIMINARYTECHNICALDATA

Preliminary Technical Data

AD7276/AD7277/AD7278

TYPICAL CONNECTION DIAGRAM

Table I provides some typical performance data with

various references used as a V_DDsource under the same

set-up conditions.

Figure 10 shows a typical connection diagram for the

AD7276/AD7277/AD7278. V_REFis taken internally from

V_DDand as such V_DDshould be well decoupled. This

provides an analog input range of 0V to V_DD. The

conversion result is output in a 16-bit word with two

leading zeros followed by the 12-bit, 10-bit or 8-bit result.

The 12-bit result from the AD7276 will be followed by

two trailing zeros and the 10-bit and 8-bit result from the

AD7277 and AD7278 will be followed by four and six

trailing zeros respectively.

Reference Tied

To V_DD

AD7276 SNR Performance

TBD kHz Input

AD780@3V

ADR423

TBD dB

AD780@2.5V

REF192

ADR421

TBD dB

Alternatively, because the supply current required by the

AD7276/AD7277/AD7278 is so low, a presision reference

can be used as the supply source to the AD7276/AD7277/

AD7278. A REF19x voltage reference (REF193 for 3V)

can be used to supply the required voltage to the ADC

-see Figure 10. This configuration is especially useful if

the power supply is quite noisy or if the system supply

voltages are at some value other than 3V (e.g. 5V or 15V).

The REF19x will output a steady voltage to the AD7276/

7277/7278. If the low dropout REF193 is used, the

current it needs to supply to the AD7276/AD7277/

AD7278 is typically TBD mA. When the ADC is

converting at a rate of 3 MSPS the REF193 will need to

supply a maximum of TBD mA to the AD7276/AD7277/

AD7278. The load regulation of the REF193 is typically

10 ppm/mA (REF193, V_Sꢀ 5V), which results in an error

of TBD ppm (TBD µV) for the TBD mA drawn from it.

This corresponds to a TBD LSB error for the AD7276

with V_DDꢀ 3V from the REF193, a TBD LSB error for

the AD7277, and a TBD LSB error for the AD7278. For

applications where power consumption is of concern, the

Power-Down mode of the ADC and the sleep mode of the

REF19x reference should be used to improve power per-

formance. See Modes of Operation section.

ADR291

Table I. AD7276 performance for various Voltage

References IC

Analog Input

Figure 11 shows an equivalent circuit of the analog input

structure of the AD7276/AD7277/AD7278. The two

diodes D1 and D2 provide ESD protection for the analog

inputs. Care must be taken to ensure that the analog input

signal never exceeds the supply rails by more than 300mV.

This will cause these diodes to become forward biased and

start conducting current into the substrate. 10mA is the

maximum current these diodes can conduct without

causing irreversable damage to the part. The capacitor C1

in Figure 11 is typically about 4pF and can primarily be

attributed to pin capacitance. The resistor R1 is a lumped

component made up of the on resistance of a switch. This

resistor is typically about TBDΩ. The capacitor C2 is the

ADC sampling capacitor and has a capacitance of TBD

pF typically. For ac applications, removing high

frequency components from the analog input signal is

recommended by use of a bandpass filter on the relevant

analog input pin. In applications where harmonic distor-

tion and signal to noise ratio are critical, the analog input

should be driven from a low impedance source. Large

source impedances will significantly affect the ac perfor-

mance of the ADC. This may necessitate the use of an

input buffer amplifier. The choice of the op-amp will be a

function of the particular application.

+3V

+5V

REF193

SUPPLY

1µF

TANT

0.1µF

TBD mA

10µF

0.1µF

680nF

0V toV

SCLK

SDATA

AD7276/

AD7277/

AD7278

INPUT

DSP/

µC/µP

GND

SERIAL

INTERFACE

TBD PF

Figure 10. REF193 as Power Supply to AD7276/

AD7277/AD7278

4pF

CONVERSION PHASE - SWITCH OPEN

TRACK PHASE - SWITCH CLOSED

Figure 11. Equivalent Analog Input Circuit

REV. PrF

–14–

1...11 12 131415 16 17...20

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