WM8234

Product Brief

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Product Brief, Rev 3.0, February 2012

8

ELECTRICAL CHARACTERISTICS

Test Conditions

PARAMETER

SYMBOL

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

Overall System Specification (including 10-bit ADC, PGA, Offset and CDS functions)

Conversion rate per channel

5

23.3

MSPS

Full-scale input voltage range

(see Note 1)

ADCFS=0, Max Gain

ADCFS=0, Min Gain

0.12

2.0

Vp-p

Vp-p

ADCFS=1, Max Gain

ADCFS=1, Min Gain

0.18

3.0

Vp-p

Vp-p

Input signal limits (see Note 2)

SF_INP=0

AGND-0.3

AVDD+0.3

V

SF_INP=1

AGND

AGND+1.2

V

Input capacitance

Inputs to AGND

10

pF

Full-scale transition error

Gain = 0dB;

AGAIN[4:0] = 02(hex)

DGAIN[11:0] = 6AB(hex)

20

mV

Zero-scale transition error

Gain = 0dB;

AGAIN[4:0] = 02(hex)

DGAIN[11:0] = 6AB(hex)

20

mV

Differential non-linearity

DNL

10-bit

0.5

LSB

Integral non-linearity (pk-pk/2)

INL

10-bit

1

LSB

Channel to channel gain matching

Min Gain

5

%

Max Gain

15

%

Output noise

Unity Gain

(Unused channels grounded)

0.3

LSB rms

Channel to channel crosstalk

10-bit

+/-0.5

LSB

Programmable Gain Amplifier

Total Resolution (Ga + Gd)

12

bits

Analogue Gain

Ga

0.6 + 0.3 * AGAIN[4:0]

V/V

Max gain, each channel (Ga)

AGAIN[4:0] = 1F(hex)

9.9

V/V

Min gain, each channel (Ga)

AGAIN[4:0] = 0(hex)

0.6

V/V

Digital Gain

Gd

DGAIN[11:0] / 2

11

V/V

Max gain, each channel (Gd)

DGAIN[11:0] = FFF(hex)

2

V/V

Min gain, each channel (Gd)

DGAIN[11:0] = 400 (hex)

0.5

V/V

Max gain, each channel

(Ga + Gd)

AGAIN[4:0] = 1F(hex)

DGAIN[11:0] = FFF(hex)

19.8

V/V

Min gain, each channel

(Ga + Gd)

AGAIN[4:0] = 0(hex)

DGAIN[11:0] = 400 (hex)

0.3

V/V

Analogue to Digital Converter

Resolution

16

bits

Speed

70

MSPS

Notes:

1.

Full-scale input voltage

level in CDS mode) that can be gained to match the ADC full-scale input range.

2.

Input signal limits

are the limits within which each input voltage and VRLC reference must lie.