AD1674JNZ

更新时间： 2024-01-01 12:47:16

品牌	Logo	应用领域
亚德诺 - ADI		转换器光电二极管信息通信管理
页数	文件大小	规格书
12页	258K
描述
12-Bit 100 kSPS A/D Converter

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中文翻译

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数据手册
替代型号

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AD1674JNZ 数据手册

Typical Dynamic Performance–AD1674

f_SAMPLE= 100kSPS

FULL-SCALE = +10V

0dB INPUT

–20dB INPUT

–20

THD

–40

–60

–80

–60dB INPUT

HARMONIC

–100

–120

HARMONIC

100

1000 10000

100

1000

10000

INPUT FREQUENCY – kHz

Figure 5. Harm onic Distortion vs.

Input Frequency

Figure 6. S/(N+D) vs. Input Frequency

and Am plitude

Figure 7. S/(N+D) vs. Input Am plitude

–10

–20

–30

–40

–50

–60

–70

–80

–100

–120

–140

–90

–100

–110

–120

–130

10 15 20 25 30 35 40 45 50

FREQUENCY – kHz

Figure 8. Nonaveraged 2048 Point FFT

at 100 kSPS, f_IN= 25.049 kHz

Figure 9. IMD Plot for f_IN= 9.08 kHz (fa), 9.58 kHz (fb)

DAC current sum to be greater than or less than the input cur-

rent. If the sum is less, the bit is left on; if more, the bit is

turned off. After testing all the bits, the SAR contains a 12-bit

binary code which accurately represents the input signal to

within ±1/2 LSB.

GENERAL CIRCUIT O P ERATIO N

T he AD1674 is a complete 12-bit, 10 µs sampling analog-to-

digital converter. A block diagram of the AD1674 is shown on

page 7.

When the control section is commanded to initiate a conversion

(as described later), it places the sample-and-hold amplifier

(SHA) in the hold mode, enables the clock, and resets the suc-

cessive approximation register (SAR). Once a conversion cycle

has begun, it cannot be stopped or restarted and data is not

available from the output buffers. T he SAR, timed by the inter-

nal clock, will sequence through the conversion cycle and return

an end-of-convert flag to the control section when the conver-

sion has been completed. T he control section will then disable

the clock, switch the SHA to sample mode, and delay the ST S

LOW going edge to allow for acquisition to 12-bit accuracy.

T he control section will allow data read functions by external

command anytime during the SHA acquisition interval.

CO NTRO L LO GIC

T he AD1674 may be operated in one of two modes, the full-

control mode and the stand-alone mode. T he full-control mode

utilizes all the AD1674 control signals and is useful in systems

that address decode multiple devices on a single data bus. T he

stand-alone mode is useful in systems with dedicated input ports

available and thus not requiring full bus interface capability.

T able I is a truth table for the AD1674, and Figure 10 illus-

trates the internal logic circuitry.

Table I. AD 1674A Truth Table

CE CS R/C 12/8 A₀O peration

During the conversion cycle, the internal 12-bit, 1 mA full-scale

current output DAC is sequenced by the SAR from the most

significant bit (MSB) to the least significant bit (LSB) to pro-

vide an output that accurately balances the current through the

5 kΩ resistor from the input signal voltage held by the SHA.

T he SHA’s input scaling resistors divide the input voltage by 2

for the 10 V input span and by 4 V for the 20 V input span,

maintaining a 1 mA full-scale output current through the 5 kΩ

resistor for both ranges. T he comparator determines whether

the addition of each successively weighted bit current causes the

None

Initiate 12-Bit Conversion

Initiate 8-Bit Conversion

Enable 12-Bit Parallel Output

Enable 8 Most Significant Bits

Enable 4 LSBs +4 T railing Zeroes

–9–

REV. C

1...6 7 8910 11 12

中文翻译

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AD1674JNZ 替代型号

型号	品牌	替代类型	描述	数据表
AD574AJNZ	ADI	类似代替	Complete 12-Bit Converter
AD1674KN	ADI	类似代替	12-Bit 100 kSPS A/D Converter
AD1674BD	ADI	类似代替	12-Bit 100 kSPS A/D Converter

与AD1674JNZ相关器件

型号	品牌	获取价格	描述	数据表
AD1674JR	ADI	获取价格	12-Bit 100 kSPS A/D Converter
AD1674JR-REEL	ADI	获取价格	1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28, PLASTIC, SOIC-28
AD1674JRZ	ADI	获取价格	12-Bit 100 kSPS A/D Converter
AD1674JRZ-REEL	ADI	获取价格	12-Bit 100 kSPS A/D Converter
AD1674K	ADI	获取价格	12-Bit 100 kSPS A/D Converter
AD1674KN	ADI	获取价格	12-Bit 100 kSPS A/D Converter
AD1674KNZ	ADI	获取价格	12-Bit, 100 kSPS, Complete ADC
AD1674KR	ADI	获取价格	12-Bit 100 kSPS A/D Converter
AD1674KRZ-REEL	ADI	获取价格	12-Bit, 100 kSPS, Complete ADC
AD1674T	ADI	获取价格	12-Bit 100 kSPS A/D Converter

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