DAC1282AIPW datasheet(5/46 Pages) TI1

部品番号	DAC1282AIPW

部品情報	Low Distortion Digital-to-Analog Converter for Seismic

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DAC1282, DAC1282A

www.ti.com

SBAS490B – DECEMBER 2011 – REVISED MAY 2015

7.4 Electrical Characteristics

Minimum and maximum specifications are at TA = –40°C to +85°C. Typical specifications are at TA = +25°C, AVDD = +2.5 V,

AVSS = –2.5 V, fCLK = 4.096 MHz, VREF = 5 V, and DVDD = 3.3 V (unless otherwise noted). Refer to Figure 50. DAC1282A

supports gains = 1/1, 1/4, and 1/16 only.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG OUTPUT (VOUTP, VOUTN)

Full-scale output voltage(1)

Gain = 1/1 to 1/64

±VREF /2 × gain

V

Output common-mode voltage(2)

–0.1

V

Differential output impedance

1.6

Ω

CLOAD

Capacitive load

2

nF

RLOAD

Resistive load

100

Ω

Output current limit(3)

±60

mA

TA = +25°C

2

High-Z output leakage

nA

TA = +85°C

50

DC PERFORMANCE (Excluding Pulse Mode)

Gain error

Gain = 1/1

±0.1%

±0.75%

Gain match

Relative to gain = 1/1

±0.05%

±0.5%

Gain drift

2

ppm/°C

±(75/gain) +

ppm

Offset

Gain = 1/1 to 1/64

±(7/gain) + 50

300

FSR(4)

ppm

Offset drift

1.5

FSR/°C

AC PERFORMANCE

Gain = 1/1

–125

–118

dB

Gain = 1/2, 1/4, 1/8

–125

dB

DAC1282

Gain = 1/16

–123

dB

THD

Total harmonic distortion(5)

Gain = 1/32

–115

dB

Gain = 1/64

–111

dB

Gain = 1/1

–118

–106

dB

DAC1282A

Gain = 1/4, 1/16

–118

dB

Gain = 1/1

116

120

dB

Gain = 1/2

119

dB

Gain = 1/4

117

dB

SNR

Signal-to-noise ratio(6)

Gain = 1/8

114

dB

Gain = 1/16

110

dB

Gain = 1/32

106

dB

Gain = 1/64

100

dB

Output frequency

0.4883

250

Hz

Digital gain

0.5-dB steps

Full mute

0

dB

AVDD, AVSS

85

dB

PSR

Power-supply rejection

60-Hz ac, gain = 1/8

DVDD

120

dB

(1)

Full-scale differential output voltage: VOUT = (VOUTP – VOUTN) = ±VREF/2 × Gain. Gain is the DAC analog gain.

(2)

Output common-mode voltage scales with analog supply voltage: VCOM = 0.48 × (AVDD – AVSS) + AVSS.

(3)

Sink or source current limit of VOUTP and VOUTN.

(4)

FSR – full-scale range = VREF × gain.

(5)

THD = total harmonic distortion. THD is measured by the ADS1282, and is the sum of first nine harmonics using complementing gain.

fOUT = 31.25 Hz, VOUT – 0.5 dBFS, no load.

(6)

SNR = signal-to-noise ratio. SNR is measured by the ADS1282 over a 413-Hz bandwidth using complementing gain. fOUT = 31.25 Hz

and VOUT – 0.5 dBFS.

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