Wolfson WM0832LID, WM0832LCP, WM0832LCD, WM0832IP, WM0832ID Datasheet

WM0831, WM0832

Production Data

Sept 1996 Rev 2.1

8-Bit ADCs with Serial Interface and Differential or Dual Inputs

Description

WM0831 and WM0832 are 8-bit analogue to digital converters (ADC) with serial I/O interfaces, providing a choice of input configurations in 8-pin SO or DIP packages. WM0831 has a differential input, also configurable as a single ended input. A-D conversion results are serially output on Data Out (DO) under the control of clock and chip select inputs. The device has a separate voltage reference input.

WM0832's two input multiplexer is configurable via the Data In (DI) serial input, as two single ended inputs or a single differential input. The voltage reference operates ratiometrically and is internally connected to the VCC pin.

Conversion is initiated by bringing and holding chip select low while providing a clock input. With WM0831's fixed input configuration, the conversion result is output at DO on the clock's falling edges in MSB to LSB order.

With WM0832's configurable input multiplexer, data is input to DI on the rising edges of the clock to setup the Mux and initiate conversion. Conversion results appear serially at DO on the falling edges of the clock, first in MSB to LSB order, and then repeated in LSB to MSB order.

WM0831/2 operate on 5V or 3.3V supply voltages and are available in small outline and DIP packages for commercial (0 to 70oC) and industrial (-40 to 85oC) temperature ranges.

Features

•Functionally Equivalent to National Semiconductor ADC0831 and ADC0832

•WM0831: Differential or single ended input

•WM0832: Two single ended inputs or a single differential input

•Ratiometric reference input (fixed for WM0832)

•Serial I/O interface

•Input range 0 to Vcc with Vcc Reference

•8 pin package, SO or DIP

•5V and 3.3V variants

•Total Unadjusted Error: ± 1 LSB

•8-bit resolution

•32 μs conversion time at fclock = 250 kHz

Applications

•Embedding with remote sensors

•Equipment health monitoring

•Automotive

•Industrial control

Block Diagrams								WM0832
		WM0831
						CS
						CLK				Internal CS
VREF					Vcc						Vcc
							Input Latch
						DI
								Start Conv
							Mux Select
	Differential Input	Comparator	DAC	Control Logic	CS	CH1	MUX		VREF	Control Logic
IN+			&
IN-			SAR						DAC
			Logic		CLK	CH0		Comparator
							Input		&
									SAR
									Logic
GND		WM0831		Output	DO
				Latch			WM0832			Output Shift
											DO
						GND				Register

Production Data data sheets contain final specifications current on publication date. Supply of products conforms to Wolfson Microelectronics standard terms and conditions.

Wolfson Microelectronics	© 1996 Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
Tel: [phone] Fax: [phone]
email: [e-mail]
www: http://www.wolfson.co.uk

WM0831, WM0832

	Pin Configuration		Ordering Information
	Top View		5V devices
	8 pin P (DIP) and D (SO) packages
			DEVICE	TEMP. RANGE	PACKAGE
			WM0831CP	0oC to 70oC	8 pin plastic DIP
			WM0831CD	0oC to 70oC	8 pin plastic SO
			WM0831IP	-40oC to 85oC	8 pin plastic DIP
			WM0831ID	-40oC to 85oC	8 pin plastic SO
			WM0832CP	0oC to 70oC	8 pin plastic DIP
			WM0832CD	0oC to 70oC	8 pin plastic SO
	WM0831	WM0832	WM0832IP	-40oC to 85oC	8 pin plastic DIP
			WM0832ID	-40oC to 85oC	8 pin plastic SO
			3.3V devices
			DEVICE	TEMP. RANGE	PACKAGE
			WM0831LCP	0oC to 70oC	8 pin plastic DIP
			WM0831LCD	0oC to 70oC	8 pin plastic SO
			WM0831LIP	-40oC to 85oC	8 pin plastic DIP
			WM0831LID	-40oC to 85oC	8 pin plastic SO
			WM0832LCP	0oC to 70oC	8 pin plastic DIP
			WM0832LCD	0oC to 70oC	8 pin plastic SO
			WM0832LIP	-40oC to 85oC	8 pin plastic DIP
			WM0832LID	-40oC to 85oC	8 pin plastic SO

Absolute Maximum Ratings (note 1)

Supply Voltage, Vcc (note 2) . . . . . . . . . . . 6.5 V Input voltage range:

Digital Inputs . . . . GND - 0.3 V, VCC + 0.3 V

Analogue inputs . . . GND - 0.3 V, VCC + 0.3 V Input current, any pin (note 3) . . . . . . ± 5 mA Total Input current for package . . . . . . ± 20 mA

Operating temperature range, TA . . . . TMIN to TMAX WM083_C_ (C suffix) . . . . . . . . . 0oC to +70oC WM083_I_ (I suffix) . . . . . . . . . . -40oC to +85oC

Storage Temperature . . . . . . . . - 65oC to +150oC Soldering Information:

Lead Temperature 1.6 mm (1/16) from case

for 10 seconds: D or P package . . . . . . . 260oC

Recommended Operating Conditions (5V)

				SYMBOL	MIN	NOMINAL	MAX	UNIT
Supply voltage				VCC	4.5	5	5.5	V
High level input voltage				VIH	2			V
Low level input voltage				VIL			0.8	V
Clock frequency				fclock	10		600	KHz
Clock duty cycle (see Note 4)				Dclk	40		60	%
Pulse duration		high		twH(CS)		220		ns
	CS
Operating free-air temperature			C suffix	TA	0		70	oC
			I Suffix	TA	-40		85

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WM0831, WM0832

Electrical Characteristics (5V)

Vcc = 5V, VREF = 5V,fCLK = 250KHz, TA = TMIN to TMAX, tr = tf = 20 ns, unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Inputs

High level output voltage

VOH

VCC = 4.75 V, IOH = -360 μA

2.4

V

VCC = 4.75 V, IOH = -10 μA

4.5

V

Low level output voltage

VOL

VCC = 5.25 V, IOH = 1.6 mA

0.4

V

High level input current

IIH

VIH = 5 V

0.005

1

μA

Low level input current

IIL

VIL = 0 V

-0.005

-1

μA

High level output (source)

IOH

VOH = 0 V

-6.5

-24

mA

current

Low level output (sink) current

IOL

VOL = VCC

8

26

mA

High impedance-state

IOZ

VO = 5 V

0.01

3

μA

output current (DO)

VO = 0 V

-0.01

-3

μA

Input capacitance

CI

5

pF

Output capacitance

Co

5

pF

Converter and Multiplexer

Total unadjusted error

TUE

VREF = 5 V. (note 7)

±1

LSB

Differential Linearity

(note 8)

8

Bits

Supply voltage variation error

Vs(error)

VCC = 4.75 V to 5.25 V

±1/16

±1/4

LSB

Common mode error

Differential mode

±1/16

±1/4

LSB

Common mode input voltage

VICR

(note 9)

GND-0.05

V

range

VCC+0.05

Standby input leakage

II(stdby)

On-channel

VI = 5 V at ON ch.

1

μA

current (note 10)

Off-channel

VI = 0 V at OFF ch.

-1

μA

On-channel

VI = 0 V at ON ch.

-1

μA

Off-channel

VI = 5 V at OFF ch.

1

μA

Conversion time

tconv

Excluding MUX addressing time

8

clock

periods

Reference Inputs

Input resistance to

Ri(REF)

Can only be tested for WM0831

1.3

2.4

5.9

kΩ

reference ladder

Total device

Supply current WM0831

ICC

0.6

1.25

mA

Supply current WM0832

ICC

( note 11)

2.5

4.7

mA

Timing Parameters

Setup time,

CS

low or

tsu

350

ns

WM0832 data valid before

clock

Hold time, WM0832 data

th

90

ns

valid after clock

Propagation delay time,

MSB data first.

CL = 100 pF

1500

ns

output data after clock

tpd

LSB data first.

CL = 100 pF

600

ns

Output disable time, DO

tdis

CL = 10 pF, RL = 10 kΩ

125

250

ns

after CS

CL = 100 pF, RL = 2 kΩ

500

ns

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WM0831, WM0832

Recommended Operating Conditions (3.3V)

				SYMBOL	MIN	NOMINAL	MAX	UNIT
Supply voltage				VCC	2.7	3.3	3.6	V
High level input voltage				VIH	2			V
Low level input voltage				VIL			0.8	V
Clock frequency (Vcc = 3.3V)				fclock	10		600	KHz
Clock duty cycle (see Note 4)				Dclk	40		60	%
Pulse duration		high		twH(CS)	220			ns
	CS
Operating free-air temperature			C suffix	TA	0		70	oC
			I Suffix	TA	-40		85

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WM0831, WM0832

Electrical Characteristics (3.3V)

Vcc = 3.3V, fCLK = 250KHz, TA = TMIN to TMAX, tr = tf = 20 ns, unless otherwise stated.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Inputs

High level output voltage

VOH

VCC = 3V, IOH = -360 μA

2.4

V

VCC = 3 V, IOH = -10 μA

2.8

V

Low level output voltage

VOL

VCC = 3V, IOH = 1.6 mA

0.4

V

High level input current

IIH

VIH = 3.6 V

0.005

1

μA

Low level input current

IIL

VIL = 0 V

-0.005

-1

μA

High level output (source)

IOH

VOH = 0 V, TA = 25oC

6.5

15

mA

current

Low level output (sink) current

IOL

VOL = 0V, TA = 25oC

8

16

mA

High impedance-state

IOZ

VO = 3.3V, TA = 25oC

0.01

3

μA

output current (DO)

VO = 0 V, TA = 25oC

-0.01

-3

μA

Input capacitance

CI

5

pF

Output capacitance

Co

5

pF

Converter and Multiplexer

Total unadjusted error

TUE

VREF = 3.3 V. (note 7)

±1

LSB

Differential Linearity

(note 8)

8

Bits

Supply voltage variation error

Vs(error)

VCC = 3 V to 3.6 V

±1/16

±1/4

LSB

Common mode error

Differential mode

±1/16

±1/4

LSB

Common mode input voltage

VICR

(note 9)

GND-0.05

V

range

VCC+0.05

Standby input leakage

II(stdby)

On-channel

VI =3.3V at ON ch.

1

μA

current (note 10)

Off-channel

VI =0 V at OFF ch.

-1

μA

On-channel

VI =0 V at ON ch.

-1

μA

Off-channel

VI =3.3V at OFF ch.

1

μA

Conversion time

tconv

Excluding MUX addressing time

8

clock

periods

Reference Inputs

Input resistance to

Ri(REF)

Can only be tested for WM0831

1.3

2.4

5.9

kΩ

reference ladder

Total device

Supply current WM0831

ICC

0.2

0.75

mA

Supply current WM0832

ICC

( note 11)

1.5

2.5

mA

Timing Parameters

Setup time,

CS

low or

tsu

350

ns

WM0832 data valid before

clock

Hold time, WM0832 data

th

90

ns

valid after clock

Propagation delay time,

MSB data first.

CL = 100 pF

200

500

ns

output data after clock

tpd

LSB data first.

CL = 100 pF

80

200

ns

Output disable time, DO

tdis

CL = 10 pF, RL = 10 kΩ

80

125

ns

after CS

CL = 100 pF, RL = 2 kΩ

250

ns

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