DAC1280 datasheet(3/24 Pages) TI

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REF

· Gain;

= 5V,

= 30k

nominal

REF

= IOUTP

IOUTN = 7.5

DAC1280

www.ti.com

SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010

ELECTRICAL CHARACTERISTICS

Minimum/maximum specifications at –40°C to +85°C, typical specifications at +25°C, AVDD = +2.5V, AVSS = –2.5V, DVDD =

3.3V, CLK = 4.096MHz, VREF = 5V, and RREF = 30kΩ, unless otherwise noted. Refer to circuit configuration shown in

Figure 35.

DAC1280

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG OUTPUTS

Full-scale output current

IFS = (IOUTP – IOUTN)

(1)

Gain = 1/1 to 1/64

±1250

● Gain

Output common-mode voltage(2)

– 0.15

+ 0.15

DC PERFORMANCE(3)

Gain error

Gain = 1/1

±0.02

±0.25

Gain match

Relative to Gain = 1/1

±0.1

±0.5

Gain drift(4)

ppm/°C

Offset

Gain = 1/1 to 1/64

±50

±800

ppm of FS

Offset drift(4)

0.2

ppm of FS/°C

Gain = 1/1

1.2

mVRMS

Gain = 1/2

1.4

mVRMS

Gain = 1/4

1.8

mVRMS

DC noise(5)

Gain = 1/8

2.9

mVRMS

Gain = 1/16

5.5

mVRMS

Gain = 1/32

mVRMS

Gain = 1/64

mVRMS

AC PERFORMANCE

Gain = 1/1

–125

–118

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

–125

Total harmonic

THD

Gain = 1/16

–124

distortion(6)

Gain = 1/32

–118

Gain = 1/64

–113

Gain = 1/1

116

120

Gain = 1/2

119

Gain = 1/4

117

Signal-to-noise ratio(7)

SNR

Gain = 1/8

114

Gain = 1/16

109

Gain = 1/32

105

Gain = 1/64

AVDD, AVSS

60Hz ac, gain = 1/8

Power-supply rejection

PSR

DVDD

60Hz ac

115

–3dB bandwidth

8.2

kHz

REFERENCE VOLTAGE INPUT (VREF)

Reference voltage

VREF = VREF – AVSS

2.4

AVDD + 0.25

Operating

220

Ω

Input impedance

Power-down

(1)

TDATA modulated 75% and 25% yielding positive full-scale output and negative full-scale output, respectively. Full-scale positive and

negative output current is given by:

Gain can be trimmed by adjusting VREF/RREF ratio over the range of 40% to 105% of nominal.

(2)

Output common-mode voltage is regulated by the external I/V converter. The specified output common-mode voltage range is: (AVDD +

AVSS)/2 ±0.15V.

(3)

Excludes the tolerances of external components.

(4)

Drift is calculated over the specified temperature range using the box calculation method.

(5)

DC noise measured by ADS1282 with complementing gain over 413Hz bandwidth with DAC output = 0V.

(6)

THD = Total harmonic distortion; measured by ADS1282 with complementing gain including first nine harmonics, DAC output =

–0.5dBFS, 31.25Hz.

(7)

SNR = Signal-to-noise ratio; measured by ADS1282 with complementing gain over 413Hz bandwidth, DAC output = –0.5dBFS,

31.25Hz.

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