DAC7718 datasheet(3/60 Pages) TI

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DAC7718

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SBAS467A – MAY 2009 – REVISED DECEMBER 2009

ELECTRICAL CHARACTERISTICS: Dual-Supply

All specifications at TA = TMIN to TMAX, AVDD = +16.5V, AVSS = –16.5V, IOVDD = DVDD = +5V, REF-A and REF-B = +5V,

gain = 6, AGND-x = DGND = 0V, data format = straight binary, and Offset DAC A and Offset DAC B are at default values

(1),

unless otherwise noted.

DAC7718

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

STATIC PERFORMANCE(2)

Resolution

Bits

Linearity error

Measured by line passing through codes 000h and FFFh

±1

LSB

Differential linearity error

Measured by line passing through codes 000h and FFFh

±1

LSB

Bipolar zero error

TA = +25°C, gain = 4 or 6, code = 800h

±1

LSB

Bipolar zero error TC

Gain = 4 or 6, code = 800h

±0.5

±2

ppm FSR/°C

TA = +25°C, gain = 6, code = 000h

±1

LSB

Zero-code error

TA = +25°C, gain = 4, code = 000h

±1

LSB

Zero-code error TC

Gain = 4 or 6, code = 000h

±0.5

±3

ppm FSR/°C

TA = +25°C, gain = 6

±1

LSB

Gain error

TA = +25°C, gain = 4

±1

LSB

Gain error TC

Gain = 4 or 6

±1

±3

ppm FSR/°C

Full-scale error

TA = +25°C, gain = 4 or 6, code = FFFh

±1

LSB

Full-scale error TC

Gain = 4 or 6, code = FFFh

±0.5

±3

ppm FSR/°C

Measured channel at code = 800h, full-scale change on any

DC crosstalk(3)

0.05

LSB

other channel

(1)

Offset DAC A and Offset DAC B are trimmed in manufacturing to minimize the error for symmetrical output. The default value may vary

no more than ±1 LSB from the nominal number listed in Table 7. The Offset DAC pins are not intended to drive an external load, and

must not be connected during dual-supply operation.

(2)

Gain = 4 and TC specified by design and characterization.

(3)

The DAC outputs are buffered by op amps that share common AVDD and AVSS power supplies. DC crosstalk indicates how much dc

change in one or more channel outputs may occur when the dc load current changes in one channel (because of an update). With

high-impedance loads, the effect is virtually immeasurable. Multiple AVDD and AVSS terminals are provided to minimize dc crosstalk.

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