DDC114IRTCRG3 datasheet(3/37 Pages) TI1

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DDC114

SBAS255C − JUNE 2004 − REVISED APRIL 2009

www.ti.com

ELECTRICAL CHARACTERISTICS

At TA = +25

°C, AVDD = +5V, DVDD = 3V, VREF = +4.096V, Range 5 (250pC), and continuous mode operation, unless otherwise noted.

Low-Power Mode: TINT = 400

µs and CLK = 4MHz; High-Speed Mode: TINT = 320µs and CLK = 4.8MHz.

Low-Power Mode

High-Speed Mode

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

ANALOG INPUT RANGE

Range 0

10.2

13.8

∗(1)

∗

Range 1

47.5

52.5

∗

Range 2

100

105

∗

Range 3

142.5

150

157.5

∗

Range 4

190

200

210

∗

Range 5

237.5

250

262.5

∗

Range 6

285

300

315

∗

Range 7

332.5

350

367.5

∗

Negative Full-Scale Range

−0.4% of Positive Full-Scale Range

∗

Input Current(2)

750

∗

µA

DYNAMIC CHARACTERISTICS

Data Rate

2.5

3.125

kSPS

Integration Time, TINT

Continuous Mode

400

1,000,000

320

∗

µS

Integration Time, TINT

Non-continuous Mode, Range 1 to 7

∗

µS

System Clock Input (CLK)

CLK_4X = 0

4.8

MHz

CLK_4X = 1

19.2

MHz

Data Clock (DCLK)

∗

MHz

ACCURACY

Noise, Low-Level Input(3)

CSENSOR(4) = 50pF, Range 5 (250pC)

5.2

6.5

5.5

ppm of

FSR(5), rms

Integral Linearity Error(6)

±0.01% Reading ± 0.5ppm FSR, typ

∗

Integral Linearity Error(6)

±0.025% Reading ± 1.0ppm FSR, max

∗

Resolution

FORMAT = 1

∗

Bits

Resolution

FORMAT = 0

∗

Bits

Input Bias Current

0.1

∗

Range Error Match(7)

All Ranges

0.1

0.5

∗

% of FSR

Range Sensitivity to VREF

VREF = 4.096

± 0.1V

1:1

∗

Offset Error

±400

±1000

∗

ppm of FSR

Offset Error Match(7)

±100

∗

ppm of FSR

DC Bias Voltage(9)

Low-Level Input (< 1% FSR)

±0.05

±2

∗

Power-Supply Rejection Ratio

at dc

±25

±200

∗

ppm of FSR/V

Internal Test Signal

∗

Internal Test Accuracy

±10

∗

PERFORMANCE OVER TEMPERATURE

Offset Drift

±0.5

±3(8)

∗

ppm of

FSR/

°C

Offset Drift Stability

±0.2

±1(8)

∗

ppm of FSR/

minute

DC Bias Voltage Drift(9)

∗

µV/°C

Input Bias Current Drift

TA = +25

°C to +45°C

0.01

1(8)

∗

pA/

°C

Range Drift(10)

∗

ppm/

°C

REFERENCE

Voltage

4.000

4.096

4.200

∗

Input Current(11)

Average Value

µA

(1)

∗ indicates that specification is the same as Low-Power Mode.

(2) Exceeding maximum input current specification may damage device.

(3) Input is less than 1% of full scale.

(4) CSENSOR is the capacitance seen at the DDC114 inputs from wiring, photodiode, etc.

(5) FSR is Full-Scale Range.

(6) A best-fit line is used in measuring nonlinearity.

(7) Matching between side A and side B of the same input.

(8) Ensured by design, not production tested.

(9) Voltage produced by the DDC114 at its input which is applied to the sensor.

(10)Range drift does not include external reference drift.

(11)Input reference current decreases with increasing TINT (see the Voltage Reference section, page 11).

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