WM8146

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WOLFSON MICROELECTRONICS LTD

PP Rev 1.1 January 2000

4

ELECTRICAL CHARACTERISTICS

Test Conditions

°C, MCLK = 12MHz unless otherwise stated.

PARAMETER

SYMBOL

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

Overall System Specification (including 12-bit ADC, PGA, Offset and CDS functions)

NO MISSING CODES GUARANTEED

Full-scale transition error

±25

±100

mV

Zero-scale transition error

±25

±100

mV

Differential non-linearity

DNL

+1.5

LSB

References

Upper reference voltage

VRT

AVDD = 5V

3.47

3.5

3.53

V

Lower reference voltage

VRB

AVDD = 5V

1.47

1.5

1.53

V

DAC reference voltage

VMID

AVDD = 5V

2.47

2.5

2.53

V

RLC switching impedance

500

Ω

1.46

1.5

1.54

V

2.46

2.5

2.54

V

Reset level clamp options

VRLC

AVDD = 5V

Voltage set by register

configuration

3.46

3.5

3.54

V

Impedance VRT to VRB

250

500

750

Ω

Input Multiplexer

CDS mode full scale input range

x denotes the channel selected

Gx

2

Vp-p

Channel to channel gain matching

1

%

Offset DAC (monotonicity guaranteed)

Resolution

8 (+sign)

bits

Zero code voltage

VMID-20

VMID+20

mV

Full scale voltage error

020

mV

Differential non-linearity

DNL

0.1

0.5

LSB

Integral non-linearity

INL

0.25

1

LSB

Step size

DACRNG=0

DACRNG=1

4.9

7.4

mV/step

mV/step

Output voltage

DACRNG=0

DACRNG=1

+/-1.25

+/-1.875

V

V

Programmable Gain Amplifier (monotonicity guaranteed)

Resolution

5bits

Max gain, each channel

8.25

V/V

Min gain, each channel

0.5

V/V

Gain error, each channel

1%

DIGITAL SPECIFICATIONS

Digital Inputs

High level input voltage

0.8

∗

DVDD2

V

Low level input voltage

0.2

∗

DVDD2

V

High level input current

1

µA

Low level input current

1

µA

Input capacitance

5pF

Digital Outputs

High level output voltage

DVDD2 -

0.5

V

Low level output voltage

DGND +

0.5

V

High impedance output current

1

µA