DDC232

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SBAS331D – AUGUST 2004 – REVISED APRIL 2010

ELECTRICAL CHARACTERISTICS

At TA = +25°C, AVDD = +5V, DVDD = +3.0V, VREF = +4.096V, tINT = 333ms for DDC232C or 166ms for DDC232CK,

Range 7, and continuous mode operation, unless otherwise noted.

DDC232C

DDC232CK

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

ANALOG INPUT RANGE

Range 0

12.5

12.5

pC

Range 1

45

50

55

45

50

55

pC

Range 2

90

100

110

90

100

110

pC

Range 3

135

150

165

135

150

165

pC

Range 4

180

200

220

180

200

220

pC

Range 5

225

250

275

225

250

275

pC

Range 6

270

300

330

270

300

330

pC

Range 7

315

350

385

315

350

385

pC

Negative Full-Scale Range

–0.4% of Positive Full-Scale Range

–0.4% of Positive Full-Scale Range

pC

DYNAMIC CHARACTERISTICS

Data Rate

3

3.125

6

6.2

kSPS

Integration Time, tINT

Continuous Mode

320

1,000,000

160

1,000,000

ms

Noncontinuous Mode

50

50

ms

System Clock (CLK)

Clk_4x = 0

1

5

1

10

MHz

Clk_4x = 1

4

20

4

40

MHz

Data Clock (DCLK)

20

20

MHz

Configuration Clock (CLK_CFG)

20

20

MHz

ACCURACY

Noise, Low-Level Input

(1)

CSENSOR

(2) = 50pF

5.3

7

5.3

7

ppm of FSR

(3), rms

Integral Linearity Error

(4)

±0.025% Reading ± 1.0ppm FSR, typ

±0.025% Reading ± 1.0ppm FSR, typ

±0.05% Reading ± 1.5ppm FSR, max

±0.05% Reading ± 1.5ppm FSR, max

Resolution

No Missing Codes, Format = 1

20

19

(5)

Bits

No Missing Codes, Format = 0

16

16

Bits

Input Bias Current

±0.1

±10

±0.1

±10

pA

Range Error Match

(6)

0.1

0.5

0.1

0.5

% of FSR

Range Sensitivity to VREF

VREF = 4.096 ±0.1V

1:1

1:1

Offset Error

±200

±1000

±200

±1000

ppm of FSR

Offset Error Match

(6)

±100

±100

ppm of FSR

DC Bias Voltage

(7)

Low-Level Input (< 1% FSR)

±0.1

±2

±0.1

±2

mV

Power-Supply Rejection Ratio

at DC

100

±800

100

±800

ppm of FSR/V

(1)

Input is less than 1% of full-scale.

(2)

CSENSOR is the capacitance seen at the DDC232 inputs from wiring, photodiode, etc.

(3)

FSR is Full-Scale Range.

(4)

A best-fit line is used in measuring nonlinearity.

(5)

Output word is 20 bits with 19 bits no missing codes.

(6)

Matching between side A and side B of the same input.

(7)

Voltage produced by the DDC232 at its input that is applied to the sensor.

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