WM8148 datasheet(5/43 Pages) WOLFSON

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WM8148

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 4.0 April 1999

ELECTRICAL CHARACTERISTICS

TEST CONDITIONS

AVDD = 4.75 to 5.25V, DVDD1 and DVDD2 = 2.97 to 5.25V, AGND = DGND = 0V, TA = 0 to 70

°C, MCLK = 48MHz unless

otherwise stated (AVDD denotes the voltage applied to all AVDD pins).

PARAMETER

SYMBOL

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

Overall System Performance Including 12-bit ADC, PGA, Offset and CDS Functions

NO MISSING CODES GUARANTEED

Max Gain

0.413

Gain = 1.0

3.0

Full-scale input voltage range

Min Gain

4.13

Zero-scale transition error

Gain = 1.0

Full-scale transition error

Gain = 1.0

Differential non-linearity

DNL

Gain = 1.0

0.25

1.00

LSB

Integral non-linearity

INL

Gain = 1.0

1.0

LSB

ANALOGUE SPECIFICATION

Input Multiplexer

Channel to channel gain matching

Input voltage range

VIN

AVDD

References

Upper reference voltage

VRT

3.00

3.30

3.60

Lower reference voltage

VRB

1.50

1.80

2.10

Input return bias voltage

VRX

1.50

1.75

2.00

Diff. reference voltage (VRT-VRB)

VRTB

1.30

1.50

1.70

Output resistance VRT, VRB, VRX

VRT, VRB, VRX

buffers enabled

Ω

Resistance VRT to VRB

VRT, VRB buffers

disabled

500

800

1100

Ω

VRX Hi-Z leakage current

VRX buffer disabled

µA

VRLC/Reset-Level Clamp (RLC)

RLC switching impedance

Ω

VRLC Hi-Z leakage current

VRLC = 0 to AVDD

µA

VRLC DAC resolution

4bits

VRLC DAC step

AVDD = 5V

290

333

370

mV/step

VRLC short-circuit current

5mA

VRLC output resistance

VRLC = AVDD

VRLC = 0V

VRLC = other

Ω

Offset DAC

Resolution

8bits

Differential non-linearity

DNL

-0.25

0.05

0.25

LSB

Integral non-linearity

INL

-0.50

0.10

0.50

LSB

Output voltage

Code 00(hex)

Code FF(hex)

-200

200

Programmable Gain Amplifier. Monotonicity Guaranteed

Resolution

6bits

Max gain, each channel

GMAX

7.4

V/V

Min gain, each channel

GMIN

0.74

V/V

Gain error, each channel

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