ADS1278-SP datasheet(49/57 Pages) TI1

部品番号	ADS1278-SP

部品情報	Radiation Hardened 8-Ch Simultaneous-Sampling 24-Bit Analog-to-Digital Converter

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DRDY

(SPIProtocol)

DOUT

(Frame-SyncProtocol)

InternalReset

CLK

3Vnom

(1)

AVDD

1Vnom

(1)

IOVDD

1Vnom

(1)

DVDD

ValidData

2

18

f

CLK

129(max)

t

DATA

49

ADS1278-SP

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SBAS937 – SEPTEMBER 2018

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10 Power Supply Recommendations

The ADS1278-SP has three power supplies: AVDD, DVDD, and IOVDD. AVDD is the analog supply that powers

the modulator, DVDD is the digital supply that powers the digital core, and IOVDD is the digital I/O power supply.

The IOVDD and DVDD power supplies can be tied together if desired (1.8 V). To achieve rated performance, it is

critical that the power supplies are bypassed with 0.1-μF and 10-μF capacitors placed as close as possible to the

supply pins. A single 10-μF ceramic capacitor may be substituted in place of the two capacitors.

Figure 85 shows the start-up sequence of the ADS1278-SP. At power-on, bring up the DVDD supply first,

followed by IOVDD and then AVDD. Check the power-supply sequence for proper order, including the ramp rate

of each supply. DVDD and IOVDD may be sequenced at the same time if the supplies are tied together. Each

supply has an internal reset circuit whose outputs are summed together to generate a global power-on reset.

After the supplies have exceeded the reset thresholds, 218 fCLK cycles are counted before the converter initiates

the conversion process. Following the CLK cycles, the data for 129 conversions are suppressed by the

ADS1278-SP to allow output of fully-settled data. In SPI protocol, DRDY is held high during this interval. In

frame-sync protocol, DOUT is forced to zero. The power supplies should be applied before any analog or digital

pin is driven. For consistent performance, assert SYNC after device power-on when data first appear.

Figure 85. Start-Up Sequence

同様の部品番号 - ADS1278-SP

メーカー	部品番号	データシート	部品情報
Texas Instruments	ADS1278-EP	1Mb / 45P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
	ADS1278-HT	1Mb / 45P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
	ADS1278-HT	1Mb / 56P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
	ADS1278-HT	1Mb / 56P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER

More results

同様の説明 - ADS1278-SP

メーカー	部品番号	データシート	部品情報
Texas Instruments	ADS1278-EP	1Mb / 45P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
	ADS1278-HT	1Mb / 56P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
	ADS1278-HT	1Mb / 45P	[Old version datasheet] OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
Analog Devices	AD7771	357Kb / 14P	8-Ch, 24-Bit Simultaneous Sampling ADC
Intersil Corporation	HS-9008RH	179Kb / 4P	Radiation Hardened CMOS 8-Bit Flash Analog-to-Digital Converter
Intersil Corporation	HS-9008RH	193Kb / 5P	Radiation Hardened CMOS 8-Bit Flash Analog-to-Digital Converter
Texas Instruments	ADS1278	1Mb / 52P	[Old version datasheet] Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters
	THS1009	235Kb / 31P	[Old version datasheet] 10-BIT, 2 ANALOG INPUT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER
	THS1209	327Kb / 34P	[Old version datasheet] 12-BIT, 2 ANALOG INPUT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER
	THS10082	263Kb / 34P	[Old version datasheet] 10 bit TWO ANALOG INPUT, 8 MSPS SIMULTANEOUS SAMPLING ANALOG TO DIGITAL CONVERTER